1280341 九、發明說明： 【發明所屬之技術領域】 本發明係關於具有冷卻器之冰箱者。 【先前技術】 過去，冰箱中冷藏室與冷凍室之冰箱内溫度之控制，係 於各至中δ又置 度感測器，以使該溫度感測器檢測出之溫 度成為特定之溫度範圍之方式，進行使壓縮機旋轉之馬達 控制（專利文獻1)。 惟作為馬達之控制方法，已知有使用向量控制之驅動方 法，並已揭示有使用該向量控制之驅動方法之洗衣機（專利 文獻2)。 專利文獻1 :特開平11-304332號 專利文獻2 :特開2003-24686 於如同上述之先前冰箱中，因使用以溫度感測器之冰箱 内溫度之控制，故難以把握冰箱内溫度之全體溫度，此外， 因溫度感測器之蓋體等保護部分之熱容量，具有即使冰箱 内溫度上升亦無法立刻反應之問題點。 因以溫度感測為進行控制，故冰凍循環本身之負荷為不 明，具有勉強驅動壓縮機而於冰凍循環產生高負荷之情 形。該情形下，因由安全率視之而減輕負荷進行控制，具 有無法進行適當控制之問題點。 於溫度感測器前放置食物時，感測器溫度將難以改變， 具有無法得知是否有新的食物放入冰箱内之問題點。 此外’以冷卻風扇送風之冷氣所流通之導管阻塞，或於 94286.doc 1280341 冷氣吹出口前放置食品時 檢測出。 战马難以冷卻之狀態，將無法 進步，因無法把握冷卻 ;杳俺严壬 1的之結霜量，具有即使勉強冷 凍循％動作亦無法提升 ,.L p改犯，只有消耗電力之問題點。 卜，使用向量控制時，1 择+ A、， 了 ”有如何控制冰箱之冰箱内溫 度之先所完全未曾提案之問題點。 在此’本發明係鑑於上述問題 控制冰箱内溫度之冰箱之…I累使用向里控制以 要本 相之馬達驅動裝置及冷卻風扇驅動裝 置者。 【發明内容】 :專利乾圍第1項之發明係一種冰箱之馬達驅動裝 =係具備冷絲環者，其至少具有：以三相馬達旋轉 堡縮機旋縮益、及冷卻器；藉由前述壓縮機壓縮冷媒 而冷卻前述冷卻器，使冷卻室内部冷卻者；該冰箱之馬達 驅動裝置之特徵在於包含：變流電路，其係將三相驅動電 流供：至前述馬達之固定子線圈者；PWM祕，其係將 PWM信號供給至前述變流電路者；驅動電流檢測手段，並 係檢測前述三相驅㈣流者；dq轉換手段，其係基於前述 檢測出之三相驅動電流，轉換對應磁通量之電流成分之」軸 電流’及對應前述馬達之扭矩之電流成分之q軸電流者；旋 轉送度檢測手段，其係檢測前述馬達之旋轉速度者；控制 手段，其係基於前述轉換之q軸電流輪出速度指令信號者； «度控制手段，其係基於前述檢测出之現在旋轉速度盘 前述速度指令信號’以成為對應前述速度指令信號之旋轉 94286.doc 1280341 二 方式將控制仏说輸出至前述pwM電路者；同時， =控制手段對應前述q軸電流變化率而控制前述速度指 〜凋正/爪通則述冷凍循環之冷媒流量而控制前述冷 卻室之冰箱内溫度。 月專矛J fc圍第2項之發明係如申請專利範圍第丄項之冰 箱t馬達驅動裝置’其中前述控制手段當q轴電流變化率為 正以提升旋轉速度之方式輸出前述速度指令信號。 申月專利fe圍第3項之發明係、如中請專利範圍第丄項之冰 箱之馬達驅動裝置’其中前述控制手段當推電流變化率為 負時’以降低旋轉速度之方式輸出前述速度指令信號。 狄申請專利範圍第4項之發明係如中請專利範圍第i項之冰 相之馬達驅動裝置，其中前述冰箱於前述冷卻器附近具有 冷卻風扇；前驗财絲於前述_電歧變前述冷卻風 扇之旋轉數。 汾申請專利範圍第5項之發明係如中請專利範圍第i項之冰 相之馬達驅動裝置，其中前述冰箱具有檢測前述冷卻室門 之開關之門檢測手段；前述控制手段於前述門檢測手段檢 貝J出門關閉狀怨後，進行前述冰箱内溫度之控制。 汾申請專利範圍第6項之發明係如中請專利範圍第i項之冰 箱之馬達驅動裝置，其中前述冰箱具有檢測前述冷卻室門 之開關之門檢測手段；前述控制手段於前述門檢測手段檢 測出前述門關閉狀態後之特定時間經過後，進行前述冰箱 内溫度之控制。 申請專利範圍第7項之發明係如申請專利範圍第丨項之冰 94286.doc 1280341 相之馬達驅動裝置，苴中 出+ ’、刖述拴制手段基於前述q軸電流求 叫間電力，並顯示於顯示手段。 相 民專利耗圍第8項之發明係如申請專利範圍第^項之冰 述 〃巾Μ述方疋轉速度檢測手段係由以前 兒/瓜欢，貝丨手段所檢測出之三相驅動電流而演算。 r月專利祀圍第9項之發明係如申請專利範圍第1項之冰 ^達職裝置，其中前述旋轉速度檢測手段係、基於設 演/述馬達之旋轉子附近之位置檢測手段之位置信號而 啦申請專利範圍第1G項之發明係如中請專利範圍第⑴項 育任項之冰相之馬達驅動裝置，其中前述馬達為三相誘 V電動機或三相無刷直流馬達。 申凊專利範圍第11項之發明係-種冰箱之冷卻風扇驅動 、置’其係具備冷;東循環者，其至少具有··以三相馬達旋 :之壓縮機、凝縮器、及冷卻器；並具有配置於前述冷卻 β附近，將以前述冷卻器冷卻之冷氣送風至冷卻室之冷卻 Τ扇者’·該冰箱之冷卻風扇驅動裝置之特徵在於包含··變 机電路，其係將三相驅動電流供給至旋轉前述冷卻風扇之 風扇馬達之固定子線圈者；PWM電路，其係將PWM信號供 給至前述變流電路者；驅動電流檢測手段，其係檢測前述 三相驅動電流者；dq轉換手段，其係基於前述檢測出之三 相驅動電流，轉換對應磁通量之電流成分之d軸電流，及對 應前述風扇馬達之扭矩之電流成分之9軸電流者；旋轉速度 檢測手段，其係檢測前述風扇馬達之旋轉速度者；控制手 94286.doc -10- 1280341 段’其係基於前述轉換之_電流輸出速度指令信號者；及 速度控制手段’其係基於前述檢測出之現在旋轉速度與前 达速度指令信號’以成為對應前述速度指令信號之旋轉速 度之方式，將控制信號輸出至前述pwM電路者；同時，前 =控制手段對應前述q軸電流變化率而控制前述速度指令 信號’調整以前述冷卻風扇送出之冷氣流量而控制前述冷 卻室之冰箱内溫度。 申3青專利範圍第12項之私明/么1 士 & 士 ^月丁'如申睛專利範圍第11項之 冰箱之冷卻風扇驅動裝置，其中前述控制手段當q軸電流變 化率為正時，以提升旋轉速度之方式輸出前述速度指令信 號。 申凊專利範圍第13項之發明传‘由 a係如申睛專利範圍第11項之 冰箱之冷卻風扇驅動裝置，复中俞 不直，、甲則述控制手段當q軸電流變 化率為負時，以降低旋轉速度 疋反之方式輸出前述速度指令信 號。 申請專利範圍第14項之發明係‘由 乃係如申凊專利範圍第11項之 冰箱之冷卻風扇驅動裝置，其 /、T則逑冰箱具有檢測前述冷 卻室門之開關之門檢測手段；前汗^心文 ^又’則述控制手段於前述門檢測 手段檢測出門關閉狀態後，進杆1 逆仃則述冰箱内溫度之控制。 申請專利範圍第15項之發明传1由 d係如申請專利範圍第11項之 冰箱之冷卻風扇驅動裝置，发φ1 “中則述控制手段當前述轉換 之q軸電流到達特定值時，判斷於二^、人/、 岍於别述冷卻器具有結霜。 申請專利範圍第1 6項之發明位l由 月係如申請專利範圍第11項之1280341 IX. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to a refrigerator having a cooler. [Prior Art] In the past, the control of the temperature in the refrigerator in the refrigerator and the freezer in the refrigerator is performed in each of the δ δ sensors, so that the temperature detected by the temperature sensor becomes a specific temperature range. In the manner, motor control for rotating the compressor is performed (Patent Document 1). However, as a method of controlling the motor, a driving method using vector control has been known, and a washing machine using the driving method of the vector control has been disclosed (Patent Document 2). Patent Document 1: JP-A-H11-304332 Patent Document 2: JP-A-2003-24686 In the prior refrigerator as described above, it is difficult to grasp the temperature of the entire temperature in the refrigerator by using the temperature control in the refrigerator of the temperature sensor. In addition, the heat capacity of the protective portion such as the cover of the temperature sensor has a problem that it cannot be immediately reacted even if the temperature in the refrigerator rises. Since the temperature sensing is used for control, the load of the freezing cycle itself is unclear, and it has a situation in which the compressor is barely driven and a high load is generated in the freezing cycle. In this case, the load is reduced by the safety rate, and there is a problem that it is impossible to perform proper control. When the food is placed in front of the temperature sensor, the temperature of the sensor will be difficult to change, and there is a problem that it is impossible to know whether or not new food is placed in the refrigerator. In addition, it is blocked by a conduit through which the cooling air supplied by the cooling fan is ventilated, or when the food is placed before the cold air outlet of 94286.doc 1280341. In the state where the horse is difficult to cool, it will not be able to progress, because it is impossible to grasp the cooling; the frosting amount of 杳俺严壬1 has the problem that even if it is barely frozen, it can not be improved by the action of %, and the problem is that it only consumes electricity. Bu, when using vector control, 1 select + A, "has the problem of how to control the temperature inside the refrigerator refrigerator." The present invention is based on the above problems to control the temperature of the refrigerator... In the invention, the invention relates to a motor drive device and a cooling fan drive device of the present invention. The invention of the first aspect of the invention relates to a motor drive device for a refrigerator, which is provided with a cold wire ring. At least: a three-phase motor rotates the retracting machine, and a cooler; the compressor is compressed by the compressor to cool the cooler to cool the interior of the cooling chamber; the motor driving device of the refrigerator is characterized by: a converter circuit for supplying a three-phase driving current to: a fixed sub-coil of the motor; a PWM secret, which supplies a PWM signal to the converter circuit; driving a current detecting means, and detecting the three-phase driving (4) a flow; dq conversion means, based on the detected three-phase drive current, converting the "axis current" of the current component corresponding to the magnetic flux and the twist corresponding to the motor a q-axis current of a current component; a rotation-delivery detecting means for detecting a rotational speed of the motor; and a control means based on the converted q-axis current rotation speed command signal; and a degree control means And outputting the control 仏 to the aforementioned pwM circuit based on the rotation speed command 94286.doc 1280341 corresponding to the current rotation speed disk detected as the current rotation speed disk; and the control means corresponding to the q The shaft current change rate is controlled to control the speed of the refrigerant in the refrigeration chamber by controlling the refrigerant flow rate of the refrigeration cycle. The invention of the second item of the present invention is the ice box t motor driving device of the patent application section wherein the aforementioned control means outputs the aforementioned speed command signal while the q-axis current change rate is increasing the rotational speed. The invention of the third aspect of the patent of the patent, the motor drive device of the refrigerator of the third aspect of the patent application, wherein the aforementioned control means outputs the aforementioned speed command in a manner of decreasing the rotational speed when the rate of change of the current is negative signal. The invention of claim 4 is the motor drive device of the ice phase of the patent scope i, wherein the refrigerator has a cooling fan in the vicinity of the cooler; the front fuse is cooled by the aforementioned The number of rotations of the fan. The invention of claim 5 is the motor drive device of the ice phase of the patent scope i, wherein the refrigerator has a door detecting means for detecting a switch of the cooling chamber door; and the control means is the door detecting means After checking the door J to close the door, the temperature inside the refrigerator is controlled. The invention of claim 6 is the motor drive device of the refrigerator of claim i, wherein the refrigerator has a door detecting means for detecting a switch of the cooling chamber door; the control means is detected by the door detecting means After the specific time after the door closing state is passed, the temperature in the refrigerator is controlled. The invention of claim 7 is the motor drive device of the ice 94286.doc 1280341 phase of the patent application scope, and the method of 拴 出 ' 刖 基于 基于 基于 基于 基于 基于 基于 基于 基于 基于 基于 基于 基于 基于 基于 基于 基于 基于Displayed on the display means. The invention of the eighth item of the consumer patents is as follows. For example, the method of applying for the patent scope is described in the article. The method of detecting the speed of the 疋 疋 速度 速度 速度 速度 检测 检测 检测 检测 检测 检测 检测 检测 检测 三相 三相 三相 三相 三相 三相 三相 三相 三相 三相 三相 三相 三相 三相And calculus. The invention of the ninth item of the patent patent is the ice device of the first application of the patent scope, wherein the rotation speed detecting means is based on the position signal of the position detecting means in the vicinity of the rotator of the motor. The invention of claim 1G is the motor drive device of the ice phase of the patent scope (1), wherein the motor is a three-phase induced V motor or a three-phase brushless DC motor. The invention of claim 11 of the patent scope is a cooling fan driven by a refrigerator, and the system is provided with a cold; the east cycle has at least a three-phase motor: a compressor, a condenser, and a cooler. And a cooling fan that is disposed in the vicinity of the cooling β and that supplies the cold air cooled by the cooler to the cooling chamber. The cooling fan driving device of the refrigerator is characterized by including a changer circuit, which is three a phase drive current is supplied to a fixed sub-coil of a fan motor that rotates the cooling fan; a PWM circuit that supplies a PWM signal to the converter circuit; and a drive current detecting means that detects the three-phase drive current; dq a conversion means for converting a d-axis current corresponding to a current component of a magnetic flux and a 9-axis current corresponding to a current component of a torque of the fan motor based on the detected three-phase driving current; and detecting a rotation speed detecting means The rotational speed of the fan motor; the control hand 94286.doc -10- 1280341 segment is based on the aforementioned converted _ current output speed command signal; and The degree control means 'outputs a control signal to the pwM circuit based on the detected current rotation speed and the forward speed command signal 'to be the rotation speed corresponding to the speed command signal; meanwhile, the front control means The speed command signal is controlled in accordance with the q-axis current change rate to adjust the temperature of the refrigerator in the cooling chamber by adjusting the flow rate of the cold air sent by the cooling fan. Shen 3 Qing patent scope item 12 of the private / / 1 士 & 士 ^月丁', such as the application of the scope of the scope of the refrigerator, the cooling fan drive device, wherein the aforementioned control means when the q-axis current rate of change is positive At the same time, the aforementioned speed command signal is outputted in such a manner as to increase the rotational speed. The invention of the 13th article of the patent scope of the application of the invention is based on the cooling fan drive device of the refrigerator of the 11th item of the scope of the patent application, Fuzhong Yu is not straight, and the control means means that the q-axis current change rate is negative. At the same time, the speed command signal is outputted in a manner that reduces the rotational speed. The invention of claim 14 is the cooling fan driving device of the refrigerator according to item 11 of the application patent scope, and the T, the refrigerator has a door detecting means for detecting the opening and closing of the cooling chamber door; ^心文^又' The control means is that after the door detecting means detects the door closing state, the rod 1 is reversed to describe the temperature control in the refrigerator. Patent Application No. 15 of the Patent Application No. 15 is a cooling fan driving device for a refrigerator according to claim 11 of the patent application scope, and the control means means that when the q-axis current of the conversion reaches a specific value, it is judged 2^,人/, 别 别 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却 冷却
冰箱之冷卻風扇驅動裝置，其中A 、 則迭控制手段當前述轉換 94286.doc -11 - 1280341 =:上，至特定值以上時，或以前述旋轉速度檢測手 1《紅轉速度成為特定旋轉速度以下時，判斷前述 冷部風扇為已鎖定。 h專^圍第17項之發㈣如申請專利範圍第u項之 、人相^部風扇驅動裝置，其中前述控制手段於控制前述 =室之冰箱内溫度時而前述冷卻風扇為停止時，強制旋 轉則述冷卻風扇。 …t請專利範圍第18項之發明係如申請專利範圍第U項之 —> P風扇驅動裝置’其中前述旋轉速度檢測手段係 心雨述驅動電流檢測手段所檢測出之三相驅動電流而演 异0 、 申請專利範圍第19項之發明係如中請專利範圍第u項之 冷卻風扇驅動裝置，其中前述旋轉速度檢測手段係 土於叹置在則逑風扇馬達之旋轉子附近之位置檢測手段之 位置信號而演算。 申請專利範圍第20項之發明係如申請專利範圍第Η" 項中任-項之冰箱之冷卻風扇驅動裝置，纟中前述風扇馬 達為三相誘導電動機或三相無刷直流馬達。 【實施方式】 以下况明關於中請專利範圍第i項之冰箱之馬達驅動裝 置之動作狀態。 以馬達旋轉I缩機而於冷卻器送入冷媒，使冷卻器冷 :。此時，打開冰箱門收納食品日夺，冰箱内溫度上升。冰 相内溫度上升時，冰卻器周圍溫度亦上升，流通冷卻器之 94286.doc -12- 1280341 冷媒蒸發量上升。因此，對於壓縮機之負荷上升。 另 方面’旋轉壓縮機之馬達，因由冰箱之控制部以一 定之速度旋轉之方式控制，故壓縮機之負荷增大時驅動電 流將增加。 dq轉換手段為將檢測出之驅動電流轉換為對應磁通量之 包流成分之d軸電流，與對應馬達之扭矩之電流成分之q軸 電流。 於控制手段輸入q軸電流時，控制手段對應q軸電流變化 率而輸出速度指令信號。 速度控制手段基於以旋轉速度檢測手段檢測出之馬達現 在旋轉速度與控制手段之速度指令信號，以成為對應其速 度指令信號之旋轉速度之方式，將控制信號輸出至pwM電 路。 PWM電路中對應其控制信號將pwM信號供給至變流電 路，控制變流電路。 變流電路中基於PWM信號，將三相驅動電流輸出至馬達 之三相固定子線圈。 藉此，控制手段對應q軸電流變化率控制速度指令信號， 控制壓縮機之旋轉速度，可調整流通冷凍循環之冷媒流量。 藉由以上，於冷藏室内放入食品時冰箱内溫度上升，伴 隨於此因壓縮機之負荷亦上升，故q軸電流增加。藉由對應 該增加之q軸電流變化率而調整馬達之旋轉速度，增加冷媒 流量’冷卻冰箱内溫度。因此，不使用溫度感測器而可控 制冷卻室之冰箱内溫度。 94286.doc -13 - 1280341 申请專利蛇圍第2項之冰箱之馬達驅動裝置中，控制手段 當Q軸電流變化率為正時，判斷於冰箱内放入食品，以提= 旋轉速度之方式輸出速度指令信號。 申請專利範圍第3項之冰箱之馬達驅動裝置中，控制手段 當q軸電流變化率為負時’判斷冰箱内食品已充分冷卻，: 品溫度已降低，以降低旋轉速度之方式輸出速度指令信號: 申請專利範圍第4項之冰箱之馬達驅動裝置中，控制手段 基於q軸電流改變冷卻風扇之旋轉數，藉此對應放入冰箱内 之食品而控制冷卻風扇之旋轉數。 申請專利範圍第5項之冰箱之馬達驅動裝置中，控制手段 檢測出門關閉狀態時，進行冰箱内溫度之控制。其係於打 開門後關閉時，於冰箱内放入食品而使得冰箱内溫度上升 之可能性較高之故。 申請專利範圍第6項之冰箱之馬達驅動裝置中，控制手段 於檢測出門關閉狀態後之特定時間經過後，進行冰箱内温 度之控制。其係即使打開門並於之後關閉日夺，並不一定放 入食品。因此如有放入食品，於特定時間經過後將使冰箱 内溫度上升’如未放人食品則維持冰箱内溫度，故為進行 該判斷而於特定時間經過後進行冰箱内溫度之控制。 申。月專利犯圍第7項之冰箱之馬達驅動裝置中，控制手段 基於q軸電流求出瞬間電力’並顯示於顯示手段，藉此可將 現在之瞬間電力顯示於使用者。 申巧專利車巳圍第8項之冰箱之馬達驅動裝置中，由以驅動 電流檢測手段所檢測出之三相驅動電流而演算旋轉速度， 94286.doc 1280341 藉此可實現無感測器之馬達驅動裝置，可削減成本。 申β專利範圍第9項之冰箱之馬達驅動裝置中，因基於設 置在馬達之旋轉子附近之位置檢測手段之位置信號而檢測 旋轉速度，故可檢測正確之旋轉速度。 申請專利範圍第10項之冰箱之馬達驅動裝置中，馬達為 使用三相誘導電動機或三相無刷直流馬達，藉此可正確且 確實地驅動壓縮機。 以下說明關於申請專利範圍第11項之冰箱之冷卻風扇驅 動裝置之動作狀態。 以風扇馬達旋轉冷卻風扇使冷氣送風至冷卻室。此時， 打開冰箱門收納食品。藉由該收納食品之量使得冷氣之流 動改變，使得馬達負荷增大或減小。風扇馬達因由冰箱之 控制部以一定之速度旋轉之方式控制，故對應前述之馬達 負荷改變而使得驅動電流改變。 dq轉換手段為將檢測出之驅動電流轉換對應磁通量之電 μ成分之d軸電流，及對應風扇馬達之扭矩之電流成分之q 軸電流。 於控制手段輸入q軸電流時，控制手段對應9軸電流變化 率而輸出速度指令信號。 速度控制手段係基於以旋轉速度檢測手段檢測出之風扇 馬達之現在旋轉速度與控制手段之速度指令信號，以成為 對應該速度指令信號之旋轉速度之方式，將控制信號輸出 至PWM電路。 PWM電路中對應其控制信號將PwM信號供給至變流電 94286.doc 1280341 路，控制變流電路。 變流電路基於PWM信號，將三相驅動電流輸出至風扇馬 達之三相固定子線圈。 猎由以上，於冷卻室放入食品時將使得冷氣之流動變 半卩返於此因冷部風扇之負荷亦上升，故q軸電流增加。 藉由對應該增加之作電流變化率而提升風扇馬達旋轉速 度，增加冷媒流量，冷卻冰箱内溫度。因此，不使用溫度 感測為而可控制冷卻室之冰箱内溫度。 申明專利範圍第12項之冰箱之冷卻風扇驅動裝置中，控 制手段當q軸電流變化率為正時，判斷於冰箱内放入食品而 冷氣難以流動，以提升旋轉速度之方式輸出速度指令信號。 申請專利範圍第13項之冰箱之冷卻風扇驅動裝置中，控 制手段當q軸電流變化率為負時，判斷冰箱内食品之量減少 而冷氣較易流動，以降低旋轉速度之方式輸出速度指令信 號。 ° 申請專利範圍第14項之冰箱之冷卻風扇驅動裝置中，控 制手段於檢測出門關閉狀態時，進行冰箱内溫度之控制。 其係於打開門後關閉時，於冰箱内放入食品而使得冰箱内 溫度上升之可能性較高之故。 申明專利fe圍第15項之冰箱之冷卻風扇驅動裝置中，控 制手段當轉換之q軸電流到達特定值時，檢測出冷卻器之結 相例如/主目於冷氣之流動，冷卻風扇位於冷卻器下游側 時，於冷卻器產生結霜時將使得冷氣之流動變差，冷卻風 扇周圍之氣壓降低，風扇馬達之負荷降低，q軸電流亦降 94286.doc 1280341 低。因此，該q軸電流值下降至較特定值為低時判斷具有結 霜。此外，注目於冷氣之流動，冷卻風扇位於冷卻器上游 側時，於冷卻器產生結霜時將使得冷氣之流動變差，冷卻 風扇周圍之氣壓升高，風扇馬達之負荷升高，q軸電流亦升 高。因此，該q軸電流值上升至較特定值為高時判斷具有結 相 ° 申請專利範圍第16項之冰箱之冷卻風扇驅動裝置中，控 制手段當轉換之q軸電流上升至特定值以上時，或以前述旋 轉速度檢測手段檢測出之旋轉速度成為特定旋轉速度以下 時’判斷冷卻風扇為已鎖定。藉此，可確實檢測出冷卻風 扇之鎖定狀態。 申請專利範圍第17項之冰箱之冷卻風扇驅動裝置中，控 制手段於控制冷卻室之冰箱内溫度時而冷卻風扇為停止 時，強制旋轉冷卻風扇。其係進行申請專利範圍第1項之冰 箱内溫度控制時，因不旋轉冷卻風扇則無法進行控制，故 強制旋轉冷卻風扇。 申請專利範圍第1 8項之冰箱之冷卻風扇驅動裝置中，由 以驅動電流檢測手段所檢測出之驅動電流而演算旋轉速 度’藉此可實現無感測器之冷卻風扇驅動裝置，可削減成 本。 申請專利範圍第19項之冰箱之冷卻風扇驅動裝置中，因 基於設置在風扇馬達之旋轉子附近之位置檢測手段之位置 信號而檢測出旋轉速度，故可檢測出正確之旋轉速度。 申請專利範圍第20項之冰箱之冷卻風扇驅動裝置中，風 94286.doc 1280341 扇馬達係使用三相誘導電動機或三相無刷直流馬達，藉此 可正確且確實地驅動冷卻風扇。 以下，關於本發明一實施形態之冰箱1〇，基於圖丨至圖6 說明。 (1) 冰箱10之構造 關於冰箱10之構造，基於圖5說明。 如圖5所不，於冰箱1〇之外殼12，由上方起依序設置冷藏 室14、蔬果室16、第1冷凍室18、及第2冷凍室2〇，並於各 至没置門14a〜20a。 於冷藏室14背面，設置由微電腦構成之冰箱1〇之主控制 部2。 於第1冷凍室1 8背面，設置冷卻器22 ;於該冷卻器22上 方’没置冷卻風扇2 4。 於第2冷凍室20背面，設置機械室26 ;於該機械室26設置 壓縮機28。 (2) 冷凍循環30之構成 關於冷凍循環30之構成，基於圖6說明。 由壓縮機2 8傳送之冷媒，經由凝縮器3 2到達毛細管3 4。 由毛細管34送出之冷媒，以冷卻器22蒸發並於壓縮機28 循環。 以冷卻器22冷卻之空氣，以冷卻風扇24送風，送風至冰 箱10之各室14〜20。 該被送風之冷氣循環於冰箱内，並再度於冷卻器22循環。 (3) 冰箱10之電性系統之構造 94286.doc 1280341 關於冰箱10之電性系統之構造’基於圖1之區塊圖說明。 如圖1所示，由驅動壓縮機2 8之壓縮機馬達3 a、驅動該壓 ~百機馬達3 A之壓縮機驅動裝置1A、及控制該壓縮機驅動裝 置1A之主控制部2所構成。此外，於壓縮機驅動裝置1 a， 連接為驅動冷卻風扇2 4之風扇馬達5 A之風扇驅動裝置 4A。進一步’於主控制部2’連接於各室14〜20之門！4a〜20a 分別設置之門開關14b、16b、18b、20b。 首先，說明關於壓縮機驅動裝置1A之構造。 壓縮機驅動裝置1Α由以下所構成：變流電路42、整流電 路44、交流電源46、PWM形成部48Α、AD轉換部50、dq轉 換部52、速度檢測部54、速度指令輸出部56、速度pi控制 部58A、q軸電流PI控制部60、d轴電流PI控制部62、及三相 轉換部64。 旋轉壓縮機2 8之壓縮機馬達3 A，為三相無刷D C馬達。變 流電路42於該壓縮機馬達3 A之三相（u相、v相、w相）固定子 線圈40u、40v、40w，流通三相驅動電流。 該變流電路42係藉由6個電源開關半導體之電晶體 Trl〜Tr6所構成。此外，於圖中雖未表示，惟對於該開關電 晶體Trl〜Tr6於反方向並聯連接二極體。此外，於開關電晶 體Tr 1與Tr4串聯連接為檢測驅動電流之檢測電阻Ri，於開 關電晶體Tr2與Tr5串聯連接檢測電阻R2，於開關電晶體Tr3 與Tr6串聯連接檢測電阻R3。 整流電路44由商用電源（AC100 V)之交流電源46供給交 流電壓，將其整流並供給至變流電路42。 94286.doc -19- 1280341 PWM形成部48A於6個開關電晶體Trl〜Tr6之閘極端子， 供給PWM信號。PWM形成部48 A基於其後說明之三相電壓 Vu、Vv、Vw進行脈衝寬度調制，於特定時點使各開關電晶 體Trl〜Τι·6開啟/關閉。 AD轉換部50檢測出檢測電阻Rl、R2、R3中之電壓值， 將各相之電壓值由類比值轉換為數位值，輸出三相驅動電 流 Iu、Iv、Iw 〇 dq轉換部52將AD轉換部50輸出之驅動電流Iu、Iv、Iw， 轉換為對應磁通量之電流成分之d軸電流Id，與對應壓縮機 馬達3之扭矩之電流成分之q轴電流Iq。 該轉換方法如（1)式所示，將三相之Iu、Iv、Iw轉換為二 相之Ια、1/3。表不該二相電流與二相電流關係之向堇圖為 圖2。 Ια -fi ~1 -1/2 -1/2 _ Iu Iv (1) Ιβ 0 V3/2 -V3/2 Iw 其次將如此轉換之二相電流I α、I /3使用（2)式轉換為q轴 電流Iq與d軸電流Id。該二相驅動電流與q軸電流Iq與d軸電 流Id之關係具有如圖3所示向量圖之關係。The cooling fan driving device of the refrigerator, wherein the A and the control means detect the hand 1 "the red rotation speed becomes a specific rotation speed when the aforementioned conversion 94286.doc -11 - 1280341 =: to a specific value or more In the following, it is judged that the cold fan is locked. (a) the fan drive unit of the human phase, as in the application of the scope of the patent, wherein the control means for controlling the temperature in the refrigerator of the aforementioned = room and the cooling fan is stopped, forcibly Rotate to describe the cooling fan. The invention of claim 18 of the patent scope is as set forth in the U-Patent No. U-> P-fan drive device, wherein the aforementioned rotational speed detecting means is based on the three-phase drive current detected by the drive current detecting means. The invention of claim 19, wherein the invention relates to a cooling fan driving device according to the above-mentioned patent scope, wherein the rotational speed detecting means is located at a position where the sway is located near the rotator of the fan motor. The position signal of the means is calculated. The invention of claim 20 is the cooling fan driving device of the refrigerator of any one of the claims in the scope of the patent, and the fan motor is a three-phase induction motor or a three-phase brushless DC motor. [Embodiment] The following is a description of the operation state of the motor driving device of the refrigerator of the item i of the patent application. The motor is rotated by the motor and the refrigerant is sent to the cooler to cool the cooler. At this time, the refrigerator door is opened to store the food, and the temperature in the refrigerator rises. When the temperature in the ice phase rises, the temperature around the ice creamer also rises, and the evaporation of the refrigerant is increased by the circulation cooler 94286.doc -12- 1280341. Therefore, the load on the compressor rises. On the other hand, the motor of the rotary compressor is controlled by the control unit of the refrigerator rotating at a certain speed, so that the drive current is increased when the load of the compressor is increased. The dq conversion means converts the detected drive current into a d-axis current corresponding to the packet component of the magnetic flux and a q-axis current corresponding to the current component of the torque of the motor. When the q-axis current is input by the control means, the control means outputs a speed command signal in response to the q-axis current change rate. The speed control means outputs a control signal to the pwM circuit based on the current rotational speed of the motor detected by the rotational speed detecting means and the speed command signal of the control means so as to correspond to the rotational speed of the speed command signal. The PWM circuit supplies the pwM signal to the converter circuit corresponding to its control signal to control the converter circuit. The converter circuit outputs a three-phase drive current to the three-phase fixed sub-coil of the motor based on the PWM signal. Thereby, the control means controls the speed command signal in accordance with the q-axis current change rate, controls the rotation speed of the compressor, and adjusts the refrigerant flow rate in the circulation refrigeration cycle. As a result, when the food is placed in the refrigerator compartment, the temperature in the refrigerator rises, and as the load of the compressor rises, the q-axis current increases. The rotation speed of the motor is adjusted in accordance with the increased q-axis current change rate to increase the refrigerant flow rate to cool the temperature in the refrigerator. Therefore, the temperature inside the refrigerator of the cooling chamber can be controlled without using a temperature sensor. 94286.doc -13 - 1280341 In the motor drive device for the refrigerator of the second patent application, the control means judges that the food is placed in the refrigerator when the rate of change of the Q-axis current is positive, and the output is output by the rotation speed. Speed command signal. In the motor drive device of the refrigerator of claim 3, the control means determines that the food in the refrigerator has been sufficiently cooled when the rate of change of the q-axis current is negative, and the temperature of the product has been lowered, and the speed command signal is output in a manner of decreasing the rotation speed. In the motor drive device of the refrigerator of claim 4, the control means changes the number of rotations of the cooling fan based on the q-axis current, thereby controlling the number of rotations of the cooling fan corresponding to the food placed in the refrigerator. In the motor drive device of the refrigerator of claim 5, when the control means detects the door closed state, the temperature in the refrigerator is controlled. When it is closed after opening the door, it is highly likely that the temperature in the refrigerator rises by putting food in the refrigerator. In the motor drive device of the refrigerator of claim 6, the control means controls the temperature in the refrigerator after a specific time has elapsed after detecting the door closing state. Even if the door is opened and the day is closed, the food is not necessarily placed. Therefore, if food is put in, the temperature in the refrigerator rises after a certain period of time elapses. If the temperature in the refrigerator is maintained without releasing the food, the temperature in the refrigerator is controlled after the lapse of the specific time for the determination. Shen. In the motor drive device of the refrigerator of the seventh item, the control means obtains the instantaneous electric power based on the q-axis current and displays it on the display means, whereby the instantaneous electric power can be displayed to the user. In the motor drive device of the refrigerator of the eighth item of the patent car, the rotational speed is calculated by the three-phase drive current detected by the drive current detecting means, and the motor of the sensorless sensor can be realized by using 94286.doc 1280341 The drive unit can cut costs. In the motor drive device for a refrigerator according to the ninth aspect of the invention, the rotational speed is detected based on the position signal of the position detecting means provided in the vicinity of the rotary portion of the motor, so that the correct rotational speed can be detected. In the motor drive unit of the refrigerator of claim 10, the motor uses a three-phase induction motor or a three-phase brushless DC motor, whereby the compressor can be driven correctly and surely. The operation state of the cooling fan driving device for the refrigerator of claim 11 of the patent application is explained below. The cooling fan is rotated by a fan motor to supply cold air to the cooling chamber. At this time, open the refrigerator door to store food. The flow of the cold air is changed by the amount of the stored food, so that the motor load is increased or decreased. Since the fan motor is controlled by the control unit of the refrigerator rotating at a constant speed, the drive current is changed in accordance with the aforementioned change in the motor load. The dq conversion means converts the detected drive current into a d-axis current of an electric μ component corresponding to the magnetic flux and a q-axis current corresponding to a current component of the torque of the fan motor. When the q-axis current is input to the control means, the control means outputs a speed command signal corresponding to the 9-axis current change rate. The speed control means outputs a control signal to the PWM circuit based on the current rotational speed of the fan motor detected by the rotational speed detecting means and the speed command signal of the control means so as to correspond to the rotational speed of the speed command signal. The PWM circuit supplies the PwM signal to the variable current 94286.doc 1280341 corresponding to its control signal to control the converter circuit. The converter circuit outputs a three-phase drive current to the three-phase fixed sub-coil of the fan motor based on the PWM signal. Hunting from above, when the food is placed in the cooling chamber, the flow of the cold air will be reduced. The load on the cold part fan also rises, so the q-axis current increases. The fan motor rotation speed is increased by increasing the current change rate, the refrigerant flow rate is increased, and the temperature in the refrigerator is cooled. Therefore, the temperature in the refrigerator of the cooling chamber can be controlled without using temperature sensing. In the cooling fan driving device of the refrigerator of claim 12, the control means determines that the food is placed in the refrigerator and the cold air is difficult to flow when the rate of change of the q-axis current is positive, and the speed command signal is outputted in such a manner as to increase the rotational speed. In the cooling fan driving device of the refrigerator of claim 13 , when the q-axis current change rate is negative, the control means determines that the amount of food in the refrigerator is reduced and the cold air is relatively easy to flow, and the speed command signal is output in a manner of reducing the rotation speed. . ° In the cooling fan drive unit of the refrigerator of claim 14 of the patent scope, the control means controls the temperature in the refrigerator when the door is closed. When it is closed after opening the door, it is highly likely that the temperature in the refrigerator rises when food is placed in the refrigerator. In the cooling fan driving device of the refrigerator of claim 15 of the patent, the control means detects the phase of the cooler, for example, the flow of the cold air, and the cooling fan is located in the cooler when the converted q-axis current reaches a certain value. On the downstream side, when the frost is generated in the cooler, the flow of the cold air is deteriorated, the air pressure around the cooling fan is lowered, the load of the fan motor is lowered, and the q-axis current is also lowered by 94,286.doc 1280341. Therefore, the q-axis current value is judged to have frost when it is lowered to a lower specific value. In addition, attention is paid to the flow of cold air. When the cooling fan is located on the upstream side of the cooler, the flow of the cold air will be deteriorated when the cooler is frosted, the air pressure around the cooling fan rises, the load of the fan motor rises, and the q-axis current Also rising. Therefore, in the cooling fan driving device of the refrigerator in which the q-axis current value is increased to a higher value than the specific value, the control means means that when the converted q-axis current rises above a certain value, Or when the rotation speed detected by the rotation speed detecting means is equal to or lower than the specific rotation speed, "the cooling fan is judged to be locked. Thereby, the locked state of the cooling fan can be surely detected. In the cooling fan driving device of the refrigerator of claim 17, the control means forcibly rotating the cooling fan when the temperature of the refrigerator in the cooling chamber is controlled and the cooling fan is stopped. When the temperature control in the ice box in the first application of the patent application is carried out, the control cannot be performed because the cooling fan is not rotated, so the cooling fan is forcibly rotated. In the cooling fan driving device of the refrigerator of the patent application No. 18, the rotation speed is calculated by the driving current detected by the driving current detecting means, whereby the cooling fan driving device without the sensor can be realized, and the cost can be reduced. . In the cooling fan driving device for a refrigerator according to the nineteenth aspect of the invention, the rotational speed is detected based on the position signal of the position detecting means provided in the vicinity of the rotary portion of the fan motor, so that the correct rotational speed can be detected. In the cooling fan drive unit of the refrigerator of claim 20, the fan 94286.doc 1280341 fan motor uses a three-phase induction motor or a three-phase brushless DC motor, so that the cooling fan can be driven correctly and surely. Hereinafter, a refrigerator 1 according to an embodiment of the present invention will be described based on FIG. (1) Structure of Refrigerator 10 The structure of the refrigerator 10 will be described based on Fig. 5 . As shown in Fig. 5, in the outer casing 12 of the refrigerator, the refrigerating chamber 14, the vegetable and fruit chamber 16, the first freezing chamber 18, and the second freezing chamber 2 are sequentially provided from above, and each of the housings 14 is closed. ~20a. On the back side of the refrigerating compartment 14, a main control unit 2 of a refrigerator 1 made of a microcomputer is provided. A cooler 22 is provided on the back surface of the first freezer compartment 18; and a cooling fan 24 is not placed above the cooler 22. A machine room 26 is provided on the back surface of the second freezing compartment 20, and a compressor 28 is provided in the machine room 26. (2) Configuration of the refrigeration cycle 30 The configuration of the refrigeration cycle 30 will be described based on Fig. 6 . The refrigerant delivered by the compressor 28 reaches the capillary 34 via the condenser 32. The refrigerant sent from the capillary 34 is evaporated by the cooler 22 and circulated through the compressor 28. The air cooled by the cooler 22 is blown by the cooling fan 24, and is supplied to the respective chambers 14 to 20 of the ice box 10. The air-cooled air is circulated in the refrigerator and circulated again in the cooler 22. (3) Structure of Electrical System of Refrigerator 10 94286.doc 1280341 The structure of the electrical system of the refrigerator 10 is described based on the block diagram of Fig. 1. As shown in Fig. 1, the compressor motor 3a for driving the compressor 28, the compressor driving device 1A for driving the compressor 100A, and the main control unit 2 for controlling the compressor driving device 1A are formed. . Further, the compressor driving device 1a is connected to a fan driving device 4A that drives the fan motor 5A of the cooling fan 24. Further, the main control unit 2' is connected to the doors of the respective rooms 14 to 20! 4a to 20a are respectively provided with door switches 14b, 16b, 18b, and 20b. First, the configuration of the compressor driving device 1A will be described. The compressor driving device 1A is configured by a converter circuit 42, a rectifier circuit 44, an AC power supply 46, a PWM forming unit 48A, an AD conversion unit 50, a dq conversion unit 52, a speed detecting unit 54, a speed command output unit 56, and a speed. The pi control unit 58A, the q-axis current PI control unit 60, the d-axis current PI control unit 62, and the three-phase conversion unit 64. The compressor motor 3 A of the rotary compressor 28 is a three-phase brushless DC motor. The converter circuit 42 supplies three-phase drive currents to the three-phase (u-phase, v-phase, w-phase) fixed sub-coils 40u, 40v, and 40w of the compressor motor 3A. The converter circuit 42 is composed of transistors Trl to Tr6 of six power-switching semiconductors. Further, although not shown in the drawing, the switching transistors Tr1 to Tr6 are connected in parallel to the diode in the reverse direction. Further, the switching transistors Tr 1 and Tr4 are connected in series to detect the driving current Ri, the switching transistors Tr2 and Tr5 are connected in series to the detecting resistor R2, and the switching transistors Tr3 and Tr6 are connected in series to the detecting resistor R3. The rectifier circuit 44 supplies an AC voltage from an AC power source 46 of a commercial power source (AC 100 V), rectifies it, and supplies it to the converter circuit 42. 94286.doc -19- 1280341 The PWM forming portion 48A supplies a PWM signal to the gate terminals of the six switching transistors Tr1 to Tr6. The PWM forming unit 48 A performs pulse width modulation based on the three-phase voltages Vu, Vv, and Vw described later, and turns on/off the respective switching transistors Tr1 to Τ·6 at a specific timing. The AD conversion unit 50 detects the voltage values of the detection resistors R1, R2, and R3, converts the voltage values of the respective phases from the analog value to the digital value, and outputs the three-phase drive currents Iu, Iv, and Iw 〇dq conversion unit 52 to convert the AD. The drive currents Iu, Iv, and Iw output from the unit 50 are converted into the d-axis current Id corresponding to the current component of the magnetic flux and the q-axis current Iq corresponding to the current component of the torque of the compressor motor 3. This conversion method converts three-phase Iu, Iv, and Iw into two-phase Ια, 1/3 as shown in the equation (1). The graph showing the relationship between the two-phase current and the two-phase current is shown in Fig. 2. Ια -fi ~1 -1/2 -1/2 _ Iu Iv (1) Ιβ 0 V3/2 -V3/2 Iw Secondly, the two-phase currents I α and I /3 thus converted are converted into (2) using Q-axis current Iq and d-axis current Id. The relationship between the two-phase drive current and the q-axis current Iq and the d-axis current Id has a relationship with the vector diagram shown in Fig. 3.
Ίά cosd sinO la Jq_ -sind cose JP ⑺ 速度檢測部54中，基於q軸電流Iq與d軸電流Id，檢測壓 縮機馬達3 A之旋轉角0與旋轉速度ω。基於q轴電流與d軸 電流求出壓縮機馬達3 A之旋轉子位置之旋轉角0，藉由微 94286.doc -20- 1280341 分該<9求出旋轉速度ω。 主控制部2中，基於由dq轉換部52傳送之q轴電流Iq而輸 出速度指令信號S。關於該控制方法於之後說明。 速度指令輸出部56輸出主控制部2之速度指令信號S，與 基於速度檢測部54之旋轉速度ω之基準旋轉速度ω ref。基 準旋轉速度ω ref與現在旋轉速度ω同時輸入至速度PI控制 部 58A。 速度PI控制部58A中，輸出基準q軸電流Iqref與基準d軸電 流Idref，和現在q軸電流Iq與現在d轴電流Id同時分別輸出 至q轴電流PI控制部60與d轴電流PI控制部62。 q軸電流PI控制部60中，進行PI控制之同時進行電流/電壓 轉換，輸出q軸電壓Vq。 d軸電流PI控制部62中，進行PI控制之同時進行電流/電壓 轉換，輸出d軸電壓Vd。 三相轉換部64中，將d軸電壓Vd與q軸電壓Vq首先基於（3) 式轉換為二相電壓。Ίά cosd sinO la Jq_ -sind cose JP (7) The speed detecting unit 54 detects the rotation angle 0 and the rotational speed ω of the compressor motor 3 A based on the q-axis current Iq and the d-axis current Id. The rotation angle 0 of the rotational sub-position of the compressor motor 3 A is obtained based on the q-axis current and the d-axis current, and the rotational speed ω is obtained by dividing the decimal point 9 by the micro 94286.doc -20-1280341. The main control unit 2 outputs the speed command signal S based on the q-axis current Iq transmitted from the dq converter 52. This control method will be described later. The speed command output unit 56 outputs the speed command signal S of the main control unit 2 and the reference rotational speed ω ref based on the rotational speed ω of the speed detecting unit 54. The reference rotational speed ω ref is input to the speed PI control unit 58A simultaneously with the current rotational speed ω. The speed PI control unit 58A outputs the reference q-axis current Iqref and the reference d-axis current Idref, and the current q-axis current Iq and the current d-axis current Id are simultaneously output to the q-axis current PI control unit 60 and the d-axis current PI control unit, respectively. 62. The q-axis current PI control unit 60 performs current/voltage conversion while performing PI control, and outputs a q-axis voltage Vq. The d-axis current PI control unit 62 performs current/voltage conversion while performing PI control, and outputs a d-axis voltage Vd. In the three-phase conversion unit 64, the d-axis voltage Vd and the q-axis voltage Vq are first converted into a two-phase voltage based on the equation (3).
Va COS0 -sinOlVd' [νβ] sin (9 cosd \ Vq (3) 將該轉換之二相電壓之Va、V/3，基於（4)式轉換為三相 電壓 Vu、Vv、Vw。 -fl 1 -1/2 0 _ V3/2 "Va (4) 一 1/2 -V3/2 νβVa COS0 -sinOlVd' [νβ] sin (9 cosd \ Vq (3) Convert the Va, V/3 of the converted two-phase voltage into three-phase voltages Vu, Vv, Vw based on equation (4). -fl 1 -1/2 0 _ V3/2 "Va (4) 1/2 -V3/2 νβ
Vu Vv VwVu Vv Vw
將該轉換之三相電壓Vu、Vv、Vw，輸出至前述之P WM 94286.doc -21 - 1280341 形成部48A。 依據以上之壓縮機驅動裝置1A，檢測基於d軸電流^與^ 軸電流Iq之旋轉速度，並基於該旋轉速度ω與主控制部之 速度指令信號s進行反饋控制，以配合速度指令信號3之旋 轉速度ω ref旋轉壓縮機馬達3之方式，由pwM形成部48 Α將 PWM#唬輸出至變流電路42。變流電路42基於此，將三相 驅動電流輸出至壓縮機馬達3 A之三相固定子線圈4〇。 風扇馬達5 A之風扇驅動裝置4A係藉由速度ρι控制部 66A、PWM形成部68A、及驅動電路7〇所構成。 於風扇驅動裝置4A輸入速度指令輸出部56之基準旋轉速 度ω ref ’並基於此而控制冷卻風扇24之旋轉。此外，風扇 馬達5A為三相無刷DC馬達。 風扇驅動裝置4A與壓縮機驅動裝置丨a相同，基於基準旋 轉速度ω ref，將以速度PI控制部66A及pWM形成部68 a形成 之PWM信號傳送至驅動電路7〇，藉由將三相驅動電流輸出 至風扇馬達5A而控制旋轉速度。 (4)冰箱内溫度之第1控制方法 說明關於上述構成之冰箱丨〇中，調整冰箱内溫度之第1 控制方法。 上述構成之冰箱1 〇中，於冷藏室丨4、蔬果室丨6、第1冷凍 至18、及第2冷凍室2〇之至少一室收納食品時，因該食品所 具有之熱容量使得冰箱内温度上升。如此，通過冰箱内而 返回至冷部器22之空氣溫度上升，以冷卻器22蒸發之冷媒 量增加，將增大施加於冷凍循環3〇，亦即壓縮機28之負荷。 94286.doc -22- 1280341 該情形下，因藉由冰箱1〇之主控制部2之速度指令信號§ 使壓縮機馬達3A之旋轉數以維持於一定數之方式控制，故 施加於壓縮機馬達3 A之扭矩將增加。 扭矩增加時q軸電流Iq亦增加。 藉由以上，因食品所具有之熱容量使得冰箱内溫度持續 上升時，因施加於冷凍循環30之負荷增加，故q軸電流“亦 增加。 該q軸電流Iq變化量因與放入冰箱内之食品之熱容量成 比例，故以主控制部2演算由dq轉換部輸出之q軸電流1(1斜 率，對應該斜率（每單位時間之增加量）之量，主控制部2控 制速度指令信號S，將該壓縮機馬達3A與冷卻風扇24之旋轉 數以提升之方式加以控制。 藉此，放入食品時，對應於此增加壓縮機馬達3A與冷卻 風扇24之旋轉數，增加冷凍循環3〇之能力，阻止因放入之 食品而使得冰箱内溫度上升，使冰箱内溫度保持於一定溫 度。 另一方面，放入食品後經過一定時間，該放入之食品將 冷卻，冰箱内溫度將下降，施加於冷凍循環3〇,亦即壓縮 機28之負荷減少時，q轴電流Iq亦降低。在此，主控制部2 中演算q軸電流Iq之每單位時間減少率’對應於此使壓縮機 馬達3A與冷卻風扇24之旋轉數以下降之方式輸出速度指令 L唬S藉此，放入之艮品之溫度下降時，壓縮機μ之能力 亦下降，冰箱内溫度不會下降至較特定溫度範圍為低。 (5)冰箱内溫度之第2控制方法 94286.doc -23 - 1280341 除上述說明之第1控制方法 控制方法。 說明關於冰箱内溫度之第2 > j制方法中，雖由放入食品而使冰箱内溫度上升開始 、、出9軸兒/瓜Iqg化率而進行控制，惟該第2控制方法 中，如圖4所示，係基於各室…觀門…〜施打開’之後 關閉時之時點而控制者。 ”體來說，放入食品時必定將各室14〜2〇之至少一者之門 (例如冷藏室之門14a)打開並於之後關閉。因此，由以門開 關14b^測出門丨4a之關閉狀態時起，主控制部2開始進行^ 車由電流I q變化率之檢測。 之後，如圖4所示，因收納之食品所具有之熱容量使冰箱 内μ度上升，q軸電流1(}亦增加時，主控制部2求出q軸電流The converted three-phase voltages Vu, Vv, and Vw are output to the aforementioned P WM 94286.doc -21 - 1280341 forming portion 48A. According to the above compressor driving device 1A, the rotation speed based on the d-axis current ^ and the shaft current Iq is detected, and feedback control is performed based on the rotation speed ω and the speed command signal s of the main control unit to match the speed command signal 3 The rotation speed ω ref rotates the compressor motor 3, and the PWM#唬 is outputted to the converter circuit 42 by the pwM forming unit 48. Based on this, the current converting circuit 42 outputs a three-phase driving current to the three-phase fixed sub-coil 4 of the compressor motor 3A. The fan drive unit 4A of the fan motor 5A is constituted by a speed control unit 66A, a PWM forming unit 68A, and a drive circuit 7A. The fan drive unit 4A inputs the reference rotation speed ω ref ' of the speed command output unit 56 and controls the rotation of the cooling fan 24 based thereon. Further, the fan motor 5A is a three-phase brushless DC motor. Similarly to the compressor driving device 丨a, the fan driving device 4A transmits a PWM signal formed by the speed PI control portion 66A and the pWM forming portion 68a to the drive circuit 7A based on the reference rotational speed ω ref by driving the three phases. The current is output to the fan motor 5A to control the rotational speed. (4) First control method of the temperature in the refrigerator The first control method for adjusting the temperature in the refrigerator in the refrigerator of the above configuration. In the refrigerator 1 having the above configuration, when the food is stored in at least one of the refrigerator compartment 4, the vegetable compartment 6, the first freezing to 18, and the second freezing compartment 2, the heat capacity of the food is caused in the refrigerator. The temperature rises. As a result, the temperature of the air returned to the cold unit 22 through the inside of the refrigerator rises, and the amount of refrigerant evaporated by the cooler 22 increases, which increases the load applied to the refrigeration cycle 3, that is, the load of the compressor 28. 94286.doc -22- 1280341 In this case, since the number of rotations of the compressor motor 3A is controlled by a speed command signal § of the main control unit 2 of the refrigerator 1 to be maintained at a constant number, it is applied to the compressor motor. The torque of 3 A will increase. The q-axis current Iq also increases as the torque increases. According to the above, when the temperature in the refrigerator continues to rise due to the heat capacity of the food, the load applied to the refrigeration cycle 30 increases, so the q-axis current "also increases. The amount of change in the q-axis current Iq is placed in the refrigerator. Since the heat capacity of the food is proportional, the main control unit 2 calculates the q-axis current 1 (1 slope, which corresponds to the slope (the amount of increase per unit time) output by the dq converter, and the main control unit 2 controls the speed command signal S. The number of rotations of the compressor motor 3A and the cooling fan 24 is controlled in an ascending manner. Accordingly, when the food is placed, the number of rotations of the compressor motor 3A and the cooling fan 24 is increased accordingly, and the refrigeration cycle is increased. The ability to prevent the temperature in the refrigerator from rising due to the food placed, and to keep the temperature in the refrigerator at a certain temperature. On the other hand, after a certain period of time after putting the food, the food to be placed will be cooled, and the temperature in the refrigerator will drop. When applied to the refrigeration cycle 3, that is, when the load of the compressor 28 is reduced, the q-axis current Iq is also lowered. Here, the main control unit 2 calculates the rate of decrease per unit time of the q-axis current Iq' In this case, the number of rotations of the compressor motor 3A and the cooling fan 24 is decreased so that the speed command L唬S is outputted. When the temperature of the product is lowered, the capacity of the compressor μ is also lowered, and the temperature in the refrigerator is not lowered. It will fall to a lower temperature range. (5) The second control method of the temperature in the refrigerator 94286.doc -23 - 1280341 In addition to the above-described first control method control method, the second item in the refrigerator is described. In the method, the temperature is raised in the refrigerator by the food, and the 9-axis/melon Iqg rate is controlled. However, the second control method is based on each chamber as shown in FIG. 4... The door is closed...the door is opened and the controller is closed at the time of closing." In terms of body, when the food is placed, at least one of the doors 14 to 2 (such as the door 14a of the refrigerator compartment) must be opened and After that, when the door switch 14b^ detects the closed state of the threshold 4a, the main control unit 2 starts the detection of the rate of change of the current Iq by the vehicle. Thereafter, as shown in Fig. 4, the food is stored. The heat capacity has increased the μ degree in the refrigerator, and the q-axis current is 1 ( When the test is also increased, the main control unit 2 determines the q-axis current
Iq之斜率，對應其母單位時間變化率之增加量，以使壓縮 機馬達3A與冷卻風扇24之旋轉數上升之方式輸出速度指令 信號S。 藉此，可正確檢測出投入食品之時點，容易進行冰箱内 脈度之控制。例如，即使門有開關而未放入食品時，冰箱 内溫度僅稍微上升，q軸電流Iq未增加，不需控制冰箱内溫 度。另一方面，放入較熱食物等熱容量較高之食品或放入 通系溫度之食品時’因冰箱内溫度上升而必須進行上述之 控制方法。之後，將是否進行該控制之時點，藉由門開關 14b〜20b之信號可正確且確實地進行。 (6)冰箱内溫度之第3控制方法 其次說明關於冰箱1 〇之冰箱内溫度之第3控制方法。 94286.doc -24- 1280341 第2控制方法中雖檢測由門關閉時點起之^軸電流，惟 该第3控制方法中係檢測由門關閉起之特定時間後⑺後之q 軸電流I q。 亦即，當放入具有熱容量之食品之後，為因打開門造成 之冰箱内溫度上升，或因食品造成之冰箱内溫度上升為不 明。因此，主控制部2計測由門關閉起特定時間後t〇後之q 軸電流Iq變化率。 例如單純開關門，或放入熱容量較小之食品時，由門關 閉起特疋日守間後t0後之q軸電流Iq為一旦上升而之後之減少 率較大。亦即，關閉門之後q軸電流Iq雖因門之開關等影響 而增加，惟當僅有門之開關或放入熱容量較小之食品時， 該增加之q軸電流Iq之減少率較大。減少率較大時，主控制 邛2判斷成乎，又有負荷而維持旋轉數，或即使提升旋轉數亦 以提升較低旋轉數之方式輸出速度指令信號§。 另一方面’放入熱容量較大之食品時，特定時間後1〇後 之q軸電流Iq減少率可考量為較小，或不減少反而進一步增 加。因此’特定時間後t〇後之q軸電流Iq減少率較小時及增 加町判斷為放入較大負荷之食品，以提升壓縮機馬達3 A與 冷卻風扇24之旋轉數之方式輸出速度指令信號s。 (7)冰箱内溫度之第4控制方法 第3控制方法中，雖藉由門關閉時點起特定時間後丨〇後之 q轴電流Iq變化率輸出速度指令信號S，惟該第4控制方法 中，由關閉門起，q軸電流0於記錄極大值後其減少率為較 大或較小而判斷。 94286.doc -25- 1280341 計測已計測極大值後之9軸電流1(1變化率時，如該極 德之ίά'小农古六丄 .a 及从丄、. ，如該極大值The slope of Iq outputs a speed command signal S in such a manner that the number of revolutions of the compressor motor 3A and the cooling fan 24 rises in accordance with the increase in the rate of change of the parent unit time. Thereby, it is possible to accurately detect the timing at which the food is input, and it is easy to control the pulse degree in the refrigerator. For example, even if the door has a switch and no food is placed, the temperature in the refrigerator rises only slightly, and the q-axis current Iq does not increase, and it is not necessary to control the temperature inside the refrigerator. On the other hand, when a food having a high heat capacity such as a hot food or a food having a temperature at a temperature is placed, the above control method must be performed because the temperature in the refrigerator rises. Thereafter, the timing of whether or not the control is performed can be accurately and surely performed by the signals of the door switches 14b to 20b. (6) Third Control Method of Temperature in Refrigerator Next, a third control method for the temperature in the refrigerator of the refrigerator 1 will be described. 94286.doc -24- 1280341 In the second control method, the axis current from the point when the door is closed is detected, but in the third control method, the q-axis current I q after the specific time (7) after the door is closed is detected. That is, after the food having the heat capacity is placed, the temperature inside the refrigerator caused by opening the door or the temperature rise in the refrigerator due to the food is unclear. Therefore, the main control unit 2 measures the rate of change of the q-axis current Iq after t 特定 after a certain time from the door closing. For example, when a door is simply opened or closed, or when a food having a small heat capacity is placed, the q-axis current Iq after t0 after the door is closed from the gate is closed, and then the rate of decrease is large. That is, the q-axis current Iq increases after the door is closed due to the influence of the switch of the door, etc., but the decrease rate of the increased q-axis current Iq is large when only the switch of the door or the food having a small heat capacity is placed. When the reduction rate is large, the main control 邛2 judges that there is a load and maintains the number of rotations, or even if the number of rotations is increased, the speed command signal § is outputted by increasing the number of rotations. On the other hand, when a food having a large heat capacity is placed, the rate of decrease of the q-axis current Iq after 1 hour after a certain time can be considered to be small, or not increased, but further increased. Therefore, when the rate of decrease of the q-axis current Iq after t after a certain period of time is small and the increase is judged to be a food loaded with a large load, the speed command is output to increase the number of rotations of the compressor motor 3 A and the cooling fan 24 Signal s. (7) Fourth control method of the temperature in the refrigerator In the third control method, the speed command signal S is outputted by the q-axis current Iq change rate after a certain time from the time when the door is closed, but in the fourth control method From the closing of the door, the q-axis current 0 is judged by the fact that the reduction rate is larger or smaller after the maximum value is recorded. 94286.doc -25- 1280341 After measuring the maximum value of the 9-axis current 1 (1 change rate, such as the extreme ά ά 小 小 小 小 小 小 小 小 小 小 小 小 小 小 小 小 小 小 小 小 小 小
號S控制對應於此之壓縮機馬達3Α與冷卻風扇24之旋轉數。 可考里具有無法計測q軸電 此外’放入負荷較大之食品， 流Iq之極大值，q軸電流Iq之值連續增加之情形。該情形下， 即使經過特定時間tl亦無法計測極大值時，判斷為q軸電流 Iq持續增加，以最大旋轉數旋轉壓縮機馬達3A與冷卻風扇 24之方式輸出速度指令信號s。 (8) 冰箱内溫度之第5撵制方法 第5控制方法中，藉由檢測門開關14b〜2〇b之門開關信 唬，异出打開門之時間。此外，同時基於q軸電流Iq檢測伴 隨門關閉後之冷凍循環30之負荷增加之扭矩增加。之後， 藉由門之開關時間與q軸電流Iq變化，以可維持冰箱内溫度 之方式控制壓縮機28及冷卻風扇24之旋轉數。 具體來說，以打開門之時間愈多，q軸電流Iq增加率愈多 而愈為提升旋轉數之方法加以控制。 (9) 變更例 上述各控制方法中，雖僅將q軸電流Iq用於冰箱内溫度之 控制’惟除此之外，於主控制部2連接可數位顯示之液晶顯 示裝置，藉由壓縮機馬達3 A之扭矩成分之q軸電流Iq，演算 壓縮機馬達3 A消耗之瞬間電力，並將該瞬間電力以該液晶 顯示裝置顯示。 該液晶顯示裝置例如藉由安裝於冷藏室14之門14a前 94286.doc -26- 1280341 面，使用者可確認現在冰箱之消耗電力。 (變更例） 上述實施形態係本發明之一實施形態，於不離開本發明 之主旨可進行其變更。 (1) 變更例1 上述貫施形態之冰箱1 0中冷卻器雖為一個，惟分別設置 冷藏室用冷卻器與冷凍室用冷卻器，於個別冷卻器中實施 以上述實施形態說明之5種控制方法亦可。 (2) 變更例2 壓縮機馬達3 A及風扇馬達5A雖同時為三相無刷dc馬 達，惟取代其而使用三相誘導電動機亦可。 其-人關於本發明其他貫施形態之冰箱1 〇，基於圖1至圖3 及圖5至圖8說明。 (1) 冰箱10之構造 關於冰箱1 0之構造，已基於圖5說明完畢。 (2) 冷凍循環30之構成 關於冷；東循環3 0之構成，已基於圖6說明完畢。 (3) 冰箱1 〇之電性系統之構造 關於冰箱10之電性系統之構造，基於圖7之區塊圖說明。 此外附上與圖1相同符號之部分，與圖1為相同構成，並省 略其說明。 如圖7所示，由驅動冷卻風扇24之風扇馬達3B、驅動該風 扇馬達3B之冷卻風扇驅動裝置1B、及控制該冷卻風扇驅動 裝置1B之主控制部2所構成。此外，於冷卻風扇驅動裝置 94286.doc -27- 1280341 IB，連接為驅動壓縮機28之壓縮機馬達5B之壓縮機驅動裝 置4B。進一步於主控制部2，連接分別設置於各室14〜20之 門 14a〜20a之門開關 14b 、 16b 、 18b 、 20b 。 首先，說明關於冷卻風扇驅動裝置IB之構造。 冷卻風扇驅動裝置1B由以下所構成：變流電路42、整流 電路44、交流電源46、PWM形成部48B、AD轉換部50、dq 轉換部52、速度檢測部54、速度指令輸出部56、速度PI控 制部58B、q軸電流PI控制部60、d軸電流PI控制部62、及三 相轉換部64。 旋轉冷卻風扇24之風扇馬達3B，為三相無刷DC馬達。變 流電路4 2於該風扇馬達3 B之三相（u相、v相、w相）固定子線 圈40u、40v、40w，流通三相驅動電流。 PWM形成部48B於6個開關電晶體Τι*1〜Tr6之閘極端子， 供給PWM信號。PWM形成部48B基於其後說明之三相電壓 Vu、Vv、Vw進行脈衝寬度調制，於特定時點使各開關電晶 體Trl〜Tr6開啟/關閉。 AD轉換部50檢測出檢測電阻Rl、R2、R3中之電壓值， 將各相之電壓值由類比值轉換為數位值，輸出三相驅動電 流 Iu、Iv、Iw 〇 dq轉換部52將AD轉換部50輸出之驅動電流Iu、Iv、Iw， 轉換為對應磁通量之電流成分之d軸電流Id，與對應壓縮機 馬達3B之扭矩之電流成分之q軸電流Iq。 速度檢測部5 4中，基於q軸電流I q與d軸電流I d，檢測風 扇馬達3B之旋轉角0與旋轉速度ω。基於q軸電流與d轴電 94286.doc -28- 1280341 •长出風扇馬達3B之旋轉子位置之旋轉角0，藉由微分該 θ求出旋轉速度〇。 主控制部2中，基於由叫轉換部52傳送之q轴電流Iq而輸 出速度私令化號S。關於該控制方法於之後說明。 速度指令輸出部56輸出主控制部2之速度指令信號s，與 基7速度檢測部54之旋轉速度〇之基準旋轉速度wref。基 準紋轉速度ω ref與現在旋轉速度〇同時輸入至速度ρι控制 部 5 8B。 士速度PI控制部58B中，輸出基準q軸電流Iqref與基準d軸電 流Idref，和現在q軸電流Iq與現在d轴電流id同時分別輸出 至q軸電流PI控制部60與d軸電流ρι控制部62。 一相轉換部64中，將該轉換之三相電壓Vu、Vv、Vw，輸 出至前述之PWM形成部48B。 依據以上之冷卻風扇驅動裝置丨B，檢測基於d軸電流工d 與q軸電流Iq之旋轉速度，並基於該旋轉速度ω與主控制部 2之速度指令信號S進行反饋控制，以配合速度指令信號§ 之旋轉速度oref旋轉風扇馬達3之方式，由pWM形成部 將PWM信號輸出至變流電路42。變流電路化基於此，將三 相驅動電流輸出至風扇馬達3B之三相固定子線圈4〇。 壓縮機馬達5B之壓縮機驅動裝置扣係冑由速度ρι控制部 66B、PWM形成部68B、及驅動電路7〇所構成。 於壓縮機驅動裝置4B輸入速度指令輸出部兄之基準旋轉 速度ω ref，並基於此而控制壓縮機28之旋轉。此外，壓縮 機馬達5B為三相無刷DC馬達。 94286.doc -29- 1280341 壓縮機動裝置4B與冷卻風扇驅動裝置1B相同，基於基 準旋轉速度ω ref，將以速度PI控制部66B及PWM形成部68B 形成之PWM信號傳送至驅動電路7〇，藉由將三相驅動電流 輸出至壓縮機馬達5B而控制旋轉速度。 (4)冰箱内溫度之第6控制方法 說明關於上述構成之冰箱丨0中，調整冰箱内溫度之第6 控制方法。 上述構成之冰箱1〇中，於冷藏室14、蔬果室16、第1冷凍 室18、及第2冷凍室2〇之至少一室收納食品時，因該食品使 知冷氣之流動變差，而增加施加於送風冷氣之冷卻風扇24 之負荷。 該情形下，因藉由冰箱i 〇之主控制部2之速度指令信號S 使風扇馬達3B之旋轉數以維持於一定數之方式控制，故施 加於風扇馬達3 B之扭矩將增加。 扭矩增加時q軸電流Iq亦增加。 藉由以上’因收納食品時冷氣之流動變差，施加於冷卻 風扇24之負荷增加，故q軸電流1(1亦增加。 该q軸電流Iq變化量因與放入冰箱内之食品量成比例，故 以主控制部2演算由dq轉換部輸出之q軸電流Iq斜率，對應 該斜率（每單位時間之增加量）之量，主控制部2控制速度指 令信號s，將該風扇馬達3B與壓縮機馬達5B之旋轉數以提 升之方式加以控制。 藉此’放入食品時，對應於此增加風扇馬達3B與壓縮機 馬達5B之旋轉數’增加冷卻能力，阻止因放入之食品而使 94286.doc -30- 1280341 得冰箱内溫度上升，使冰箱内溫度保持於—定溫卢。 :二面’•出食品時，因該取出部分使得冷氣之流動 、仏而減少施加於冷卻風扇24之負荷日寺，q轴電軸降 :二在此，主控制部2中演算q軸電流Iq之每單位時間減少 。，對應於此使風扇馬達3B與壓縮機馬達5β之旋轉數以下 降之方式輸出速度指令信號S。藉 W ^⑤口口時，冷卻風 羽-4之能力亦下降，冰箱内 圍為低。 又不曰下…特定溫度範 (5)冰箱内溫度之第7控制方法 說明關於冰箱内溫度之第7 除上述說明之第6控制方法 控制方法。 第6控制方法中，雖由放入食品而使冰箱内溫度上升開始 起’求出q軸電流Iq變化率而進行控制，惟該第7控制方法 中，如圖4所示，係基於各室14〜2〇之門14&〜2(^打開，之後 關閉時之時點而控制者。 具體來說，放入食品時必定將各室14〜2〇之至少一者之門 (例如冷藏室之門14a)打開並於之後關閉。因此，由以門開 關14b杈測出門14a之關閉狀態時起，主控制部2開始進行 軸電流Iq變化率之檢測。 藉由該檢測，可正確檢測出投人食品之時點，容易進行 冰相内溫度之控制。例如，即使門有開關而未放入食品時， 冷氣之流動無改變，q軸電流Iq未增加，不需.控制冰箱内溫 度。另一方面，放入大量食品時，因冷氣之流動變差而必 須進灯上述之控制方法。之後，將是否進行該控制之時點， 94286.doc 31 1280341 藉由門開關14b〜20b之信號可正確且確實地進行。 (6) 除霜控制方法 其次說明關於除霜控制方法。 主控制部2當轉換之q軸電流到達預設特定值（以下，稱為 結霜基準電流值）時，檢測出冷卻器22之結霜。 如同上述，注目於冷氣之流動時，因冷卻風扇24位於冷 卻器22之下游側，故於冷卻器22產生結霜時冷氣之流動變 差，冷卻風扇24周圍之氣壓下降，風扇馬達3B較容易旋轉 且負荷下降，q軸電流亦下降。因此，於該q轴電流之值下 降至較結霜基準電流量為低時，判斷具有結霜，開始除霜 控制。 此夕卜，本實施形態之冰箱1 〇，冷卻風扇24雖位於冷卻器 22之下游側，惟注目於冷氣之流動，亦具有冷卻風扇24位 於冷卻器之上游器之情形。 該情形下，於冷卻器產生結霜時冷氣之流動變差，冷卻 風扇24周圍之氣壓上升，風扇馬達3B之負荷上升，q軸電流 亦上升。因此，如圖8所示，以特定旋轉速度使q軸電流之 值上升至較結霜基準電流量為高時，判斷具有結霜，開始 除霜控制。 (7) 風扇馬達3B之鎖定檢測方法 其次，說明關於風扇馬達3B之鎖定檢測方法。 主控制部2當轉換之q軸電流上升至預設特定值時，或以 速度檢測部54檢測出之旋轉速度成為特定旋轉速度（例如 旋轉速度為零）以下時，判斷冷卻風扇24為鎖定。藉此，可 94286.doc -32- 1280341 確實檢測出冷卻風扇24之鎖定狀態。 (8)其他 當進行上述各控制時使冷卻風扇24停止，將無法檢測出q 軸電流，故強制旋轉冷卻風扇24。 (變更例） 上述實施形態係本發明之其他實施形態，於不離開本發 明之主旨可進行其變更。 (1)變更例1 上述實施形態之冰箱10中冷卻器雖為一個，惟分別設置 冷藏室用冷卻器與冷卻風扇、冷凍室用冷卻器與冷卻風 扇’於個別冷卻ϋ與冷卻風扇中實施以上述實施形態說明 之控制方法亦可。 (2)變更例2 風扇馬達3Β及風扇壓縮機馬達5Β雖同時為三相無刷dc 馬達，惟取代其而使用三相誘導電動機亦可。 產業上之利用可能性 溫度之控制 本發明適用於具有冷卻器之冰箱中冰箱内 例如適用於家庭用冰箱、業務用冰箱。 【圖式簡單說明】 圖1為本發明一實施形態之冰箱之區塊圖 圖2為進行三相至α/5變化之向量圖。 圖3為進行α /5至dq變化之向量圖。 q軸電流與時間之 圖4為表示冷卻器溫度、冰箱内溫度 關係之時序圖。 94286.doc -33- 1280341 圖5為本實施形態之冰箱之縱剖面圖。 圖6為本實施形態之冷凍循環之構成圖。 圖7為本發明一實施形態之冰箱之區塊圖。 圖8為風扇馬達之鎖定檢測方法之其他實施例中q軸電流 與風扇馬達之旋轉速度之關係之圖。 【主要元件符號說明】 1A，4B 壓縮機驅動裝置 2 主控制部 3A，5B 壓縮機馬達 4A，1B 風扇驅動裝置 5A，3B 風扇馬達 10 冰箱 14 冷藏室 16 蔬果室 18 第1冷凍室 20 第2冷凍室 22 冷卻器 24 冷卻風扇 28 壓縮機 30 冷束循環 42 變流電路 48A，48B，68A，68B PWM形成部 52 dq轉換部 58A，58B，66A，66B 速度PI控制部 64 三相轉換部 94286.doc -34-The number S controls the number of rotations of the compressor motor 3A and the cooling fan 24 corresponding thereto. It is impossible to measure the q-axis power. In addition, the food with a large load, the maximum value of the flow Iq, and the value of the q-axis current Iq continuously increase. In this case, even if the maximum value cannot be measured after the lapse of the specific time t1, it is determined that the q-axis current Iq continues to increase, and the speed command signal s is outputted by rotating the compressor motor 3A and the cooling fan 24 by the maximum number of rotations. (8) The fifth control method of the temperature in the refrigerator In the fifth control method, by detecting the door switch signals of the door switches 14b to 2b, the time for opening the door is different. Further, at the same time, based on the q-axis current Iq, the torque increase accompanying the increase in the load of the refrigeration cycle 30 after the door is closed is detected. Thereafter, the number of revolutions of the compressor 28 and the cooling fan 24 is controlled such that the temperature in the refrigerator can be maintained by changing the switching time of the door and the q-axis current Iq. Specifically, the more time the door is opened, the more the q-axis current Iq increases, and the more the method of increasing the number of rotations is controlled. (9) Modified Example In the above respective control methods, the q-axis current Iq is used for the control of the temperature in the refrigerator. However, the main control unit 2 is connected to the liquid crystal display device capable of digital display, and the compressor is provided. The q-axis current Iq of the torque component of the motor 3 A calculates the instantaneous power consumed by the compressor motor 3 A, and displays the instantaneous power on the liquid crystal display device. The liquid crystal display device is mounted on the front surface of the door 14a of the refrigerating compartment 14 by, for example, 94286.doc -26-1280341, and the user can confirm the power consumption of the refrigerator. (Modifications) The above-described embodiments are an embodiment of the present invention, and modifications may be made without departing from the spirit of the invention. (1) Modification 1 In the refrigerator 10 of the above-described embodiment, the coolers and the freezer compartment coolers are separately provided, and the five types described in the above embodiments are implemented in the individual coolers. The control method is also available. (2) Modification 2 Although the compressor motor 3 A and the fan motor 5A are three-phase brushless dc motors at the same time, a three-phase induction motor may be used instead. A refrigerator 1 according to another embodiment of the present invention will be described based on FIGS. 1 to 3 and 5 to 8. (1) Structure of Refrigerator 10 The structure of the refrigerator 10 is described based on Fig. 5 . (2) Configuration of the refrigeration cycle 30 The structure of the cold cycle and the east cycle 30 has been described based on Fig. 6 . (3) Structure of the electrical system of the refrigerator 1 The structure of the electrical system of the refrigerator 10 is explained based on the block diagram of Fig. 7. In addition, the same reference numerals as in Fig. 1 are attached, and the same configuration as that of Fig. 1 is omitted, and the description thereof will be omitted. As shown in Fig. 7, the fan motor 3B that drives the cooling fan 24, the cooling fan driving device 1B that drives the fan motor 3B, and the main control unit 2 that controls the cooling fan driving device 1B are comprised. Further, the cooling fan driving device 94286.doc -27-1280341 IB is connected to the compressor driving device 4B that drives the compressor motor 5B of the compressor 28. Further, the main control unit 2 is connected to the door switches 14b, 16b, 18b, and 20b provided in the doors 14a to 20a of the respective chambers 14 to 20. First, the configuration of the cooling fan driving device IB will be described. The cooling fan drive device 1B is configured by a converter circuit 42, a rectifier circuit 44, an AC power supply 46, a PWM forming unit 48B, an AD conversion unit 50, a dq conversion unit 52, a speed detecting unit 54, a speed command output unit 56, and a speed. The PI control unit 58B, the q-axis current PI control unit 60, the d-axis current PI control unit 62, and the three-phase conversion unit 64. The fan motor 3B that rotates the cooling fan 24 is a three-phase brushless DC motor. The converter circuit 42 distributes three-phase drive currents to the three-phase (u-phase, v-phase, w-phase) fixed sub-coils 40u, 40v, and 40w of the fan motor 3B. The PWM forming portion 48B supplies a PWM signal to the gate terminals of the six switching transistors Τι*1 to Tr6. The PWM forming unit 48B performs pulse width modulation based on the three-phase voltages Vu, Vv, and Vw described later, and turns on/off the respective switching transistors Tr1 to Tr6 at a specific timing. The AD conversion unit 50 detects the voltage values of the detection resistors R1, R2, and R3, converts the voltage values of the respective phases from the analog value to the digital value, and outputs the three-phase drive currents Iu, Iv, and Iw 〇dq conversion unit 52 to convert the AD. The drive currents Iu, Iv, and Iw output from the unit 50 are converted into the d-axis current Id corresponding to the current component of the magnetic flux and the q-axis current Iq corresponding to the current component of the torque of the compressor motor 3B. The speed detecting unit 504 detects the rotation angle 0 and the rotational speed ω of the fan motor 3B based on the q-axis current I q and the d-axis current I d . Based on the q-axis current and the d-axis power 94286.doc -28- 1280341 • The rotation angle 0 of the rotation sub-position of the fan motor 3B is increased, and the rotation speed 求出 is obtained by differentiating the θ. The main control unit 2 outputs the speed command number S based on the q-axis current Iq transmitted by the call conversion unit 52. This control method will be described later. The speed command output unit 56 outputs the speed command signal s of the main control unit 2 and the reference rotational speed wref of the rotational speed 〇 of the base 7 speed detecting unit 54. The reference rotation speed ω ref is input to the speed ρ i control unit 5 8B simultaneously with the current rotation speed 〇. In the speed PI control unit 58B, the reference q-axis current Iqref and the reference d-axis current Idref are output, and the current q-axis current Iq and the current d-axis current id are simultaneously output to the q-axis current PI control unit 60 and the d-axis current ρι control, respectively. Section 62. The one-phase conversion unit 64 outputs the converted three-phase voltages Vu, Vv, and Vw to the PWM forming unit 48B described above. According to the above cooling fan driving device 丨B, detecting the rotational speed based on the d-axis current d and the q-axis current Iq, and performing feedback control based on the rotational speed ω and the speed command signal S of the main control unit 2 to match the speed command The rotation speed oref of the signal § rotates the fan motor 3, and the PWM signal is output to the converter circuit 42 by the pWM forming portion. The converter circuit is based on this, and the three-phase drive current is output to the three-phase fixed sub-coil 4 of the fan motor 3B. The compressor drive unit of the compressor motor 5B is constituted by a speed control unit 66B, a PWM forming unit 68B, and a drive circuit 7A. The compressor drive unit 4B inputs the reference rotational speed ω ref of the speed command output unit and controls the rotation of the compressor 28 based on this. Further, the compressor motor 5B is a three-phase brushless DC motor. 94286.doc -29- 1280341 The compressor moving device 4B transmits the PWM signal formed by the speed PI control unit 66B and the PWM forming unit 68B to the drive circuit 7A based on the reference rotational speed ω ref, similarly to the cooling fan drive unit 1B. The rotation speed is controlled by outputting a three-phase drive current to the compressor motor 5B. (4) The sixth control method of the temperature in the refrigerator. The sixth control method for adjusting the temperature in the refrigerator in the refrigerator 丨0 of the above configuration. In the refrigerator 1 configured as described above, when the food is stored in at least one of the refrigerator compartment 14, the vegetable compartment 16, the first freezing compartment 18, and the second freezing compartment 2, the flow of the cold air is deteriorated by the food. The load applied to the cooling fan 24 of the supply air cooling air is increased. In this case, since the number of rotations of the fan motor 3B is controlled to be maintained at a constant number by the speed command signal S of the main control unit 2 of the refrigerator i, the torque applied to the fan motor 3 B is increased. The q-axis current Iq also increases as the torque increases. By the above, the load applied to the cooling fan 24 increases due to the deterioration of the flow of the cold air when the food is stored, so the q-axis current 1 (1 also increases. The amount of change in the q-axis current Iq is due to the amount of food placed in the refrigerator. In the case of the ratio, the main control unit 2 calculates the slope of the q-axis current Iq outputted by the dq conversion unit, and corresponds to the amount of the slope (the amount of increase per unit time), and the main control unit 2 controls the speed command signal s to the fan motor 3B. The number of rotations of the compressor motor 5B is controlled in such a manner as to increase the cooling capacity by increasing the number of rotations of the fan motor 3B and the compressor motor 5B to prevent the food to be placed. Let 94286.doc -30- 1280341 get the temperature inside the refrigerator, so that the temperature in the refrigerator is kept at -40 °C. : Two sides'• When the food is taken out, the flow of the cold air is reduced due to the taken-out part, and the cooling fan is applied to the cooling fan. 24 load day temple, q-axis electric axis drop: 2, the calculation of the q-axis current Iq per unit time in the main control unit 2 decreases, and accordingly, the number of rotations of the fan motor 3B and the compressor motor 5β is decreased. Mode output speed Degree command signal S. When the W ^5 mouth is used, the ability to cool the wind plume-4 is also reduced, and the inner circumference of the refrigerator is low. It is not squatting... the specific temperature range (5) the seventh control method of the temperature in the refrigerator In addition to the above-described sixth control method control method, the sixth control method is controlled by the fact that the temperature in the refrigerator is raised from the start of the food, and the rate of change of the q-axis current Iq is determined. In the seventh control method, as shown in FIG. 4, it is controlled based on the doors 14 & 〜2 of each of the chambers 14 to 2 (^ is turned on, and then closed at the time of closing. Specifically, when the food is placed, it is surely The door of at least one of the chambers 14 to 2 (for example, the door 14a of the refrigerator compartment) is opened and closed thereafter. Therefore, the main control unit 2 starts the shaft when the door switch 14b detects the closed state of the door 14a. The detection of the rate of change of the current Iq. By this detection, the time at which the food is poured can be correctly detected, and the temperature in the ice phase can be easily controlled. For example, even if the door has a switch and no food is placed, the flow of the cold air does not change. Q-axis current Iq is not increased, no need to control the refrigerator On the other hand, when a large amount of food is put in, it is necessary to enter the above control method due to the deterioration of the flow of the cold air. After that, whether or not the control is performed, 94286.doc 31 1280341 by the door switches 14b to 20b The signal can be correctly and surely performed. (6) Defrost control method Next, the defrost control method is explained. The main control unit 2 when the converted q-axis current reaches a preset specific value (hereinafter, referred to as a frosting reference current value) The frosting of the cooler 22 is detected. As described above, when the cooling air is located on the downstream side of the cooler 22, the flow of the cold air is deteriorated when the cooler 22 is frosted, and the cooling fan 24 is cooled. As the surrounding air pressure drops, the fan motor 3B is easier to rotate and the load is lowered, and the q-axis current is also lowered. Therefore, when the value of the q-axis current falls below the frosting reference current amount, it is judged that there is frost formation, and the defrosting control is started. Further, in the refrigerator 1 of the present embodiment, the cooling fan 24 is located on the downstream side of the cooler 22, but it is also in the case where the cooling fan 24 is located in the upstream of the cooler. In this case, the flow of the cold air is deteriorated when the cooler is frosted, the air pressure around the cooling fan 24 rises, the load of the fan motor 3B rises, and the q-axis current also rises. Therefore, as shown in Fig. 8, when the value of the q-axis current is raised to a higher value than the frosting reference current at a specific rotation speed, it is judged that frost is formed, and the defrosting control is started. (7) Locking Detection Method of Fan Motor 3B Next, a method of detecting the lock of the fan motor 3B will be described. When the converted q-axis current rises to a preset specific value or when the rotational speed detected by the speed detecting unit 54 becomes a specific rotational speed (for example, the rotational speed is zero) or less, the main control unit 2 determines that the cooling fan 24 is locked. Thereby, the locked state of the cooling fan 24 is surely detected by 94286.doc -32-1280341. (8) Others When the above-described respective controls are performed, the cooling fan 24 is stopped, and the q-axis current cannot be detected, so the cooling fan 24 is forcibly rotated. (Modifications) The above-described embodiments are other embodiments of the present invention, and modifications may be made without departing from the spirit of the invention. (1) Modification 1 The refrigerator 10 of the above embodiment has one cooler, and is provided with a cooler for a refrigerating compartment, a cooling fan, a cooler for a freezer compartment, and a cooling fan for each of the cooling fins and the cooling fan. The control method described in the above embodiment may also be used. (2) Modification 2 Although the fan motor 3Β and the fan compressor motor 5Β are three-phase brushless dc motors at the same time, a three-phase induction motor may be used instead. Industrial Applicability Temperature Control The present invention is applicable to a refrigerator in a refrigerator having a cooler, for example, for a household refrigerator or a business refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram of a refrigerator according to an embodiment of the present invention. Fig. 2 is a vector diagram showing a three-phase to α/5 change. Figure 3 is a vector diagram showing the change of α /5 to dq. Q-axis current and time Figure 4 is a timing chart showing the relationship between the temperature of the cooler and the temperature in the refrigerator. 94286.doc -33- 1280341 Fig. 5 is a longitudinal sectional view of the refrigerator of the embodiment. Fig. 6 is a view showing the configuration of a refrigeration cycle of the embodiment. Figure 7 is a block diagram of a refrigerator in accordance with an embodiment of the present invention. Fig. 8 is a view showing the relationship between the q-axis current and the rotational speed of the fan motor in another embodiment of the lock detecting method of the fan motor. [Main component symbol description] 1A, 4B Compressor drive unit 2 Main control unit 3A, 5B Compressor motor 4A, 1B Fan drive unit 5A, 3B Fan motor 10 Refrigerator 14 Refrigerator 16 Fruit and vegetable room 18 First freezer compartment 20 Freezer compartment 22 Cooler 24 Cooling fan 28 Compressor 30 Cold beam cycle 42 Converter circuit 48A, 48B, 68A, 68B PWM forming section 52 dq converters 58A, 58B, 66A, 66B Speed PI control section 64 Three-phase converter section 94286 .doc -34-