CN114006566A - Air conditioner and variable frequency motor thereof - Google Patents
Air conditioner and variable frequency motor thereof Download PDFInfo
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- CN114006566A CN114006566A CN202111199422.2A CN202111199422A CN114006566A CN 114006566 A CN114006566 A CN 114006566A CN 202111199422 A CN202111199422 A CN 202111199422A CN 114006566 A CN114006566 A CN 114006566A
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- 239000003990 capacitor Substances 0.000 claims abstract description 32
- 230000005611 electricity Effects 0.000 claims description 4
- 230000005347 demagnetization Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 238000001514 detection method Methods 0.000 description 8
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- 230000015556 catabolic process Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
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- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
本发明涉及一种空调器及其变频电机，变频电机的驱动电路包括三相整流电路、电压采集模块、电流采集模块、电容和逆变电路，电压采集模块、电容和逆变电路分别连接于三相整流电路的输出端，三相绕组分别连接于逆变电路上桥臂和下桥臂之间，电流采集模块位于电容的负极与下桥臂之间，控制模块用于输出一个脉冲开通信号至其中一个下桥臂，获取电流采集模块检测的电流，在电流采集模块检测电流超出电流设定阈值时判断变频电机漏电。因而，本发明仅输入一个脉冲开通信号至下桥臂，缩短导通时间，利用电机绕组、下桥臂开关管、上桥臂反并联二极管形成的BOOST电路，通过检测母线电压的方式实现漏电保护，器件应力极低，无需增加硬件电路，节约成本。
The invention relates to an air conditioner and a frequency conversion motor thereof. The drive circuit of the frequency conversion motor comprises a three-phase rectifier circuit, a voltage acquisition module, a current acquisition module, a capacitor and an inverter circuit. The voltage acquisition module, the capacitor and the inverter circuit are respectively connected to three At the output end of the phase rectifier circuit, the three-phase windings are respectively connected between the upper bridge arm and the lower bridge arm of the inverter circuit, the current acquisition module is located between the negative pole of the capacitor and the lower bridge arm, and the control module is used to output a pulse turn-on signal to One of the lower bridge arms obtains the current detected by the current acquisition module, and judges the leakage of the variable frequency motor when the current detected by the current acquisition module exceeds the current set threshold. Therefore, the present invention only inputs a pulse turn-on signal to the lower bridge arm, shortens the conduction time, and uses the boost circuit formed by the motor winding, the lower bridge arm switch tube, and the upper bridge arm anti-parallel diode to realize leakage protection by detecting the bus voltage. , The stress of the device is extremely low, no need to increase the hardware circuit, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of leakage detection of variable frequency motors, in particular to an air conditioner and a variable frequency motor thereof.
Background
Under the standby state of the air conditioner compressor, the condition that a winding or a connecting wire of the compressor is grounded can occur due to the interference or corrosion of external force, the frequency converter needs to recognize in time and make a shutdown action, and devices are protected from being damaged.
As shown in fig. 1, the potential of the negative electrode of the electrolytic capacitor is lower than 0 (ground) in the conventional common inverter compressor driving circuit. Assuming that the U-phase is grounded (the coil is damaged or the power line terminal is disconnected) when the compressor is stopped, the potential at U0 is 0. In the traditional leakage protection process of the compressor, the lower bridge arm is generally directly conducted or three lower bridge arms are conducted alternately, on one hand, the lower bridge arm is relatively high in stress and risks of damage, on the other hand, if the upper bridge arm is conducted in a pilot mode, the upper bridge arm can be directly damaged, a refuge and detection circuit needs to be added, and cost is increased.
Disclosure of Invention
The invention provides a variable frequency motor and an air conditioner, and solves the technical problem of how to reduce the damage rate of devices in leakage protection by improving a control mode on the basis of not changing a hardware circuit of a variable frequency motor driving circuit in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a variable frequency motor comprises a first phase winding, a second phase winding and a third phase winding, and further comprises a driving circuit, wherein the driving circuit comprises a three-phase rectifying circuit, a voltage acquisition module, a current acquisition module, a capacitor and an inverter circuit, the voltage acquisition module is connected with the output end of the three-phase rectifying circuit, the capacitor is connected with the output end of the three-phase rectifying circuit, the inverter circuit comprises a first upper bridge arm and a fourth lower bridge arm which are connected in series, a second upper bridge arm and a fifth lower bridge arm which are connected in series, a third upper bridge arm and a sixth lower bridge arm which are connected in series, the first phase winding is connected between the first upper bridge arm and the fourth lower bridge arm, the second phase winding is connected between the second upper bridge arm and the fifth lower bridge arm, and the third phase winding is connected between the third upper bridge arm and the sixth lower bridge arm, the current acquisition module is located between the negative pole of the capacitor and the lower bridge arm, and the motor comprises:
the control module is used for outputting a pulse turn-on signal to one lower bridge arm, acquiring the current detected by the current acquisition module, judging the electric leakage of the variable frequency motor when the current detected by the current acquisition module exceeds a current set threshold, continuously outputting a PWM signal to the lower bridge arm receiving the pulse turn-on signal when the current detected by the current acquisition module does not exceed the current set threshold, acquiring the voltage detected by the voltage acquisition module, and judging whether the electric leakage of the variable frequency motor exists according to the voltage information.
Compared with the prior art, the technical scheme of the invention has the following technical effects: the invention relates to a variable frequency motor which comprises a three-phase winding and a driving circuit, wherein the driving circuit comprises a three-phase rectifying circuit, a voltage acquisition module, a current acquisition module, a capacitor and an inverter circuit, the voltage acquisition module is connected with the output end of the three-phase rectifying circuit, the capacitor is connected with the output end of the three-phase rectifying circuit, the inverter circuit comprises a first upper bridge arm and a fourth lower bridge arm which are connected in series, a second upper bridge arm and a fifth lower bridge arm which are connected in series, a third upper bridge arm and a sixth lower bridge arm which are connected in series, a first phase winding is connected between the first upper bridge arm and the fourth lower bridge arm, a second phase winding is connected between the second upper bridge arm and the fifth lower bridge arm, a third phase winding is connected between the third upper bridge arm and the sixth lower bridge arm, the current acquisition module is positioned between the negative electrode of the capacitor and the lower bridge arms, and a control module is used for outputting a pulse switching-on signal to one of the lower bridge arms, and obtaining the current detected by the current acquisition module, and judging the electric leakage of the variable frequency motor when the current detected by the current acquisition module exceeds a current set threshold value. Therefore, only one pulse turn-on signal is input to the lower bridge arm, the conduction time is shortened, the BOOST circuit formed by the motor winding, the lower bridge arm switching tube and the upper bridge arm anti-parallel diode is utilized, the leakage protection is realized by detecting the bus voltage, the detection method is extremely low in stress of the device, the damage rate of the device is reduced, a hardware circuit is not required to be added, and the cost is saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a general inverter compressor driving circuit diagram.
Fig. 2 is a driving circuit diagram of the inverter motor according to the embodiment of the present invention.
Fig. 3 is a flowchart of leakage detection of the inverter motor according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
When the variable frequency motor is in a standby state, the grounding condition of a motor winding or a connecting wire can occur due to the interference or corrosion of external force, the frequency converter needs to recognize and make a shutdown action in time, and devices are protected from being damaged.
In the drive protection test of the variable frequency motor, the bus voltage is greatly increased before the alarm of the frequency converter is found during the test of the leakage protection. The analysis circuit finds that the lower bridge wall of the frequency converter is respectively conducted for charging the bootstrap capacitor when the frequency converter is started, and under the condition that one phase of the compressor leaks electricity, the lower bridge wall IGBT, the press winding and the upper bridge arm freewheeling diode of the frequency converter form a BOOST circuit to raise the voltage of the bus capacitor. It is thus contemplated that the electrical parameter variations herein may be incorporated into a control system to effect control of earth leakage protection. Compared with the existing leakage protection, the device stress can be reduced, the success rate of protection is improved, and hardware is prevented from being increased.
A variable frequency motor comprises a three-phase winding and a driving circuit, wherein the three-phase winding comprises a first phase winding, a second phase winding and a third phase winding.
The three-phase winding is a U-phase winding, a V-phase winding and a W-phase winding, the first-phase winding is a U-phase winding or a V-phase winding or a W-phase winding, and the second-phase winding and the third-phase winding correspond to the remaining two-phase winding respectively.
As shown in fig. 2, in the present embodiment, the first phase winding is a U-phase winding, the second phase winding is a V-phase winding, and the third phase winding is a W-phase winding.
The driving circuit comprises a three-phase rectifying circuit, a voltage acquisition module, a current acquisition module, a capacitor C and an inverter circuit.
The voltage acquisition module is connected to the output end of the three-phase rectification circuit and used for acquiring bus voltage.
And the capacitor C is connected to the output end of the three-phase rectification circuit.
The inverter circuit is connected to the output end of the three-phase rectification circuit.
The inverter circuit comprises a first upper bridge arm and a fourth lower bridge arm which are connected in series, a second upper bridge arm and a fifth lower bridge arm which are connected in series, and a third upper bridge arm and a sixth lower bridge arm which are connected in series, wherein the first upper bridge arm comprises a transistor Q1 and a diode which are connected in parallel, the second upper bridge arm comprises a transistor Q2 and a diode which are connected in parallel, the third upper bridge arm comprises a transistor Q3 and a diode which are connected in parallel, the fourth lower bridge arm comprises a transistor Q4 and a diode which are connected in parallel, the fifth lower bridge arm comprises a transistor Q5 and a diode which are connected in parallel, and the sixth lower bridge arm comprises a transistor Q6 and a diode which are connected in parallel.
A first phase winding (U-phase winding) is connected between the first upper leg and the fourth lower leg.
A second phase winding (V-phase winding) is connected between the second upper leg and the fifth lower leg.
And a third phase winding (W-phase winding) is connected between the third upper bridge arm and the sixth lower bridge arm.
The current acquisition module is positioned between the negative electrode of the capacitor C and the lower bridge arm.
The purpose of this embodiment is to reduce the damage rate of the device in the leakage protection by improving the control mode on the basis of not changing the hardware circuit.
The motor also includes a control module.
The control module is used for outputting a pulse switching-on signal to one of the lower bridge arms, acquiring the current detected by the current acquisition module, and judging the electric leakage of the variable frequency motor when the current detected by the current acquisition module exceeds a current set threshold.
The width of the pulse turn-on signal needs to meet the requirement that the instantaneous peak current of a lower bridge arm receiving the pulse turn-on signal does not exceed I of the pulse turn-on signal when the lower bridge arm is in short circuitFMThe parameter maximum rating. I isFMThe parameter is a maximum rated value specified in a specification corresponding to the transistor IGBT of the lower arm.
Because the current rises in a process, the device on the bridge arm is not damaged by controlling the width of the pulse turn-on signal.
Preferably, the width of the pulsed on signal is generally between 5us and 50 us.
The current setting threshold is larger than the normal current value detected by the current acquisition module when the variable frequency motor works normally and is smaller than the demagnetization current of the variable frequency motor.
The embodiment adopts new control logic, the motor gives a narrow pulse control signal to the lower bridge arm before starting, the conduction time is shortened, the leakage protection can be realized by matching with the current acquisition module, and the stress of the lower bridge arm is reduced.
The following description will be given taking the U-phase winding as an example:
when the U-phase winding is grounded, the potential at U0 is 0 (GND), and the potential of the negative electrode of the capacitor Cnegative electrode is lower than 0 (ground). A pulse turn-on signal is sent to the Q4 by the control module, at the moment, current flows to the negative electrode of the capacitor C from the U0 and is captured by the current acquisition module, the control module receives information returned by the current acquisition module, judges that the current exceeds a set threshold value, and stops the machine and gives an alarm for electric leakage. Since the turn-on time of Q4 is extremely short, the stress of the device is controllable.
The control module is used for continuously outputting a PWM signal to a lower bridge arm receiving a pulse switching-on signal when the current detected by the current acquisition module does not exceed a current set threshold value, acquiring the voltage detected by the voltage acquisition module, and judging whether the variable frequency motor leaks electricity according to the voltage information.
Specifically, when the voltage detected by the voltage acquisition module exceeds a voltage set threshold, the leakage of the variable frequency motor is judged.
The control module judges that the response when the voltage detected by the voltage acquisition module exceeds the voltage set threshold is in the ms level, so that breakdown caused by overhigh voltage at the two ends of the capacitor C can be avoided, and the capacitor C is protected.
Wherein, the voltage setting threshold value is less than or equal to the withstand voltage value of the capacitor so as to further protect the capacitor C.
The following description will be given by taking as an example that the U-phase winding is not grounded and the V-phase winding is grounded:
when the V-phase winding is grounded, the potential at V0 is 0 (GND), and the potential of the negative electrode of the capacitor Cnegative is lower than 0 (ground). A pulse turn-on signal is sent to the Q4 by the control module, at the moment, current flows to the cathode of the electrolytic capacitor from the U0 and is captured by the current acquisition module, the control module receives information returned by the current acquisition module and judges that the current does not exceed a set threshold, the control module continuously outputs a PWM signal to the Q4, at the moment, the Q4, the U-phase winding and the Q1 are connected in an anti-parallel mode to form a BOOST circuit, and the BOOST circuit principle is as follows: when the Q4 is switched on, current flows through the V0 → the V phase winding → the U phase winding → Q4 → the negative pole of the capacitor C to charge the U phase winding (inductor); when the Q4 is turned off, current flows through the U-phase winding → the Q1 anti-parallel diode → the anode of the capacitor C, and the U-phase winding and the three-phase rectifying circuit charge the capacitor C at the same time to raise the voltage of the capacitor C. The voltage acquisition module detects that the bus voltage exceeds a voltage set threshold, transmits information to the control module, and stops the machine and gives an alarm for electric leakage. The relevant devices are not overstressed in the whole process.
In the embodiment, the BOOST circuit formed by the motor winding, the lower bridge arm switching tube and the upper bridge arm anti-parallel diode is used for realizing the leakage protection in a mode of detecting the bus voltage, and the detection method has extremely low stress of devices. The leakage protection function is realized under the condition of not increasing the stress of the device, and the manufacturing cost is not increased.
The detection methods of the U-phase winding not being grounded and the W-phase winding being grounded are the same as those of the U-phase winding not being grounded and the V-phase winding being grounded, and are not described herein again.
Further, in order to avoid the breakdown of the capacitor C by using the determination method of setting the threshold voltage, it is preferable to use a method of calculating the voltage increase rate, and advance determination may be performed. Specifically, the control module is used for continuously outputting a PWM signal to a lower bridge arm receiving a pulse switching-on signal when the current detected by the current acquisition module does not exceed a current set threshold, acquiring the voltage detected by the voltage acquisition module, calculating the voltage rise rate, and judging the electric leakage of the variable frequency motor when the voltage rise rate exceeds the voltage rise rate set threshold. Wherein the voltage rate-of-rise threshold is predetermined.
The control module is used for detecting the leakage of the variable frequency motor phase by phase, and certainly, the detection sequence of the three-phase winding is not limited.
The control module is used for outputting a pulse switching-on signal to the fourth lower bridge arm, acquiring the current detected by the current acquisition module, and judging the electric leakage of the variable frequency motor when the current detected by the current acquisition module exceeds a current set threshold; when the current detected by the current acquisition module does not exceed the current set threshold, continuously outputting a PWM signal to the fourth lower bridge arm to acquire the voltage detected by the voltage acquisition module, and judging the electric leakage of the variable frequency motor when the voltage detected by the voltage acquisition module exceeds the voltage set threshold or the voltage rise rate exceeds the voltage rise rate set threshold;
or the control module is used for outputting a pulse switching-on signal to the fifth lower bridge arm, acquiring the current detected by the current acquisition module, and judging the electric leakage of the variable frequency motor when the current detected by the current acquisition module exceeds a current set threshold; when the current detected by the current acquisition module does not exceed the current set threshold, continuously outputting a PWM signal to a fifth lower bridge arm to acquire the voltage detected by the voltage acquisition module, and judging the electric leakage of the variable frequency motor when the voltage detected by the voltage acquisition module exceeds the voltage set threshold or the voltage rise rate exceeds the voltage rise rate set threshold;
or the control module is used for outputting a pulse switching-on signal to the sixth lower bridge arm to acquire and judge the electric leakage of the variable frequency motor; when the current detected by the current acquisition module does not exceed the current set threshold, continuously outputting a PWM signal to a sixth lower bridge arm to acquire the voltage detected by the voltage acquisition module, and judging the electric leakage of the variable frequency motor when the voltage detected by the voltage acquisition module exceeds the voltage set threshold or the voltage rise rate exceeds the voltage rise rate set threshold;
and when the voltage detected by the voltage acquisition module does not exceed the voltage set threshold, judging that the variable frequency motor is not electrified.
As shown in fig. 3, the leakage detecting method for the inverter motor includes the following steps:
and S1, starting.
S2, giving Q4 a pulse turn-on signal.
And S3, judging whether the current collected by the current collecting module exceeds a current set threshold, if so, entering a step S6, otherwise, entering a step S4.
S4, the PWM signal is continuously output to Q4.
And S5, judging whether the voltage acquired by the voltage acquisition module exceeds a voltage set threshold, if so, entering a step S6, otherwise, entering a step S7.
S6, stopping the machine and alarming, and then, the process goes to step S7.
And S7, ending.
The above embodiment first detects the U phase, and then detects the V, W phase.
Of course, in some embodiments, the V phase may be detected first, and then the U, W phase may be detected: in step S2, a pulse-on signal is given to the Q5, and in step S4, the PWM signal is continuously output to the Q5.
In other embodiments, the detection may be performed on the W phase first, and then on the U, V phase: in step S2, a pulse-on signal is given to the Q6, and in step S4, the PWM signal is continuously output to the Q6.
An air conditioner comprises the variable frequency motor, and the variable frequency motor is applied to a compressor.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A variable frequency motor comprises a first phase winding, a second phase winding and a third phase winding, and further comprises a driving circuit, wherein the driving circuit comprises a three-phase rectifying circuit, a voltage acquisition module, a current acquisition module, a capacitor and an inverter circuit, the voltage acquisition module is connected to the output end of the three-phase rectifying circuit, the capacitor is connected to the output end of the three-phase rectifying circuit, the inverter circuit comprises a first upper bridge arm and a fourth lower bridge arm which are connected in series, a second upper bridge arm and a fifth lower bridge arm which are connected in series, a third upper bridge arm and a sixth lower bridge arm which are connected in series, the first phase winding is connected between the first upper bridge arm and the fourth lower bridge arm, and the second phase winding is connected between the second upper bridge arm and the fifth lower bridge arm, the third phase winding is connected between the third upper bridge arm and the sixth lower bridge arm, and the current collection module is located between the negative electrode of the capacitor and the lower bridge arm, and the motor comprises:
the control module is used for outputting a pulse turn-on signal to one lower bridge arm, acquiring the current detected by the current acquisition module, judging the electric leakage of the variable frequency motor when the current detected by the current acquisition module exceeds a current set threshold, continuously outputting a PWM signal to the lower bridge arm receiving the pulse turn-on signal when the current detected by the current acquisition module does not exceed the current set threshold, acquiring the voltage detected by the voltage acquisition module, and judging whether the electric leakage of the variable frequency motor exists according to the voltage information.
2. The variable frequency motor according to claim 1, wherein the width of the pulse-on signal is required to satisfy that the instantaneous peak current of the lower bridge arm receiving the pulse-on signal does not exceed the I thereof when the lower bridge arm is short-circuitedFMThe parameter maximum rating.
3. The variable frequency motor of claim 2, wherein the pulse-on signal has a width of between 5us and 50 us.
4. The variable frequency motor according to claim 1, wherein the current setting threshold is greater than a normal current value detected by the current collecting module when the variable frequency motor normally operates, and is less than a demagnetization current of the variable frequency motor.
5. The variable frequency motor according to claim 1, wherein the control module is configured to determine that the variable frequency motor leaks electricity when the voltage detected by the voltage acquisition module exceeds a voltage setting threshold.
6. The variable frequency motor according to claim 5, wherein the control module judges the response of the voltage detected by the voltage acquisition module when the voltage exceeds a voltage setting threshold to be ms level.
7. The inverter motor according to claim 5, wherein the voltage setting threshold is equal to or less than a withstand voltage of the capacitor.
8. The variable frequency motor according to claim 1, wherein the control module is configured to calculate a voltage rise rate according to the voltage detected by the voltage acquisition module, and determine that the variable frequency motor leaks electricity when the voltage rise rate exceeds a voltage rise rate set threshold.
9. The variable frequency motor according to claim 1, wherein the first phase winding is a U-phase winding or a V-phase winding or a W-phase winding.
10. An air conditioner characterized in that it comprises the inverter motor according to any one of claims 1 to 9.
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| CN114994490A (en) * | 2022-06-01 | 2022-09-02 | 苏州汇川控制技术有限公司 | IGBT (insulated Gate Bipolar transistor) through detection method and device, frequency converter and storage medium |
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| US20130181646A1 (en) * | 2010-10-13 | 2013-07-18 | Mitsubishi Electric Corporation | Three-phase ac to dc converter and air conditioning apparatus using three-phase ac to dc converter |
| CN104052248A (en) * | 2014-06-25 | 2014-09-17 | 台达电子企业管理（上海）有限公司 | Electricity conversion device and protective signal transmission method thereof |
| CN104660148A (en) * | 2015-03-16 | 2015-05-27 | 深圳市步科电气有限公司 | AC speed adjusting device of frequency converter |
| CN111505409A (en) * | 2020-03-30 | 2020-08-07 | 日立电梯（中国）有限公司 | On-line detection method and device for inverter bus capacitance |
| CN113489402A (en) * | 2021-06-29 | 2021-10-08 | 青岛海尔空调电子有限公司 | Phase current detection method, starting method and device of direct current fan |
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| CN114994490A (en) * | 2022-06-01 | 2022-09-02 | 苏州汇川控制技术有限公司 | IGBT (insulated Gate Bipolar transistor) through detection method and device, frequency converter and storage medium |
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