JP2015050791A - Motor control device and drum-type washing machine or drum-type washing / drying machine using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor control device that can efficiently drive a brushless motor from a low speed to a high speed without being affected by dispersion of a detection position of a position detector.SOLUTION: A control circuit 1 for inverter-controlling a brushless motor 2 slowly rotates a voltage vector created by a voltage applied to plural coils of the brushless motor 2 in advance, and detects the direction of the voltage vector when the output signal of a position detector 3 varies. When the detection value of the direction of the voltage vector is out of a predetermined range, the control circuit 1 detects abnormality and finishes position detection correction. When the detection value is within the predetermined range, the control circuit 1 stores the detection value of the direction of the voltage vector as a correction value of the position detection signal of the brushless motor 2 in storage means 5. During operation of the brushless motor, the brushless motor 2 is controlled by using the position detection signal of the position detector 3 and the correction value of the position detection signal, whereby a high-precision detection position correcting function is provided and the brushless motor 2 can be driven efficiently from a low speed to a high speed.

Description

  The present invention relates to a motor control device that controls a brushless motor and a drum-type washing machine or a drum-type washing / drying machine using the same.

  2. Description of the Related Art Conventionally, in a motor control device used in a drum type washing machine or a drum type washing / drying machine, generally, a brushless motor inverter equipped with a position detector is used to efficiently control a brushless motor from a low speed to a high speed. Control is often used (for example, see Patent Document 1). FIG. 8 shows a motor control device for driving a general brushless motor, and its configuration will be described below.

  The motor control device uses a brushless motor 2, a position detector 3 (3a, 3b, 3c) for detecting the rotor position of the brushless motor, an inverter 11 for driving the brushless motor, and a signal from the position detector. And a control circuit 64 and a drive circuit 62 for controlling the inverter 11 for driving the brushless motor. The brushless motor 2 incorporates the position detector. For example, a Hall IC that outputs the direction of the magnetic flux of the magnet of the rotor as a signal is generally used. The inverter 11 is supplied with a voltage obtained by rectifying the AC power supply 53 with the diode bridge 55 and smoothing with the capacitors 56a and 56b. The inverter 11 includes six switching elements SWU, SWV, SWW, SWX, SWY, SWZ and six diodes 60a, 60b, 60c, 61a, 61b, 61c.

  The control of the brushless motor 2 uses the signal of the position detector 3 (3a, 3b, 3c) built in the brushless motor 2, and the control circuit 64 detects the speed and position of the rotor of the brushless motor 2 from the signal. A PWM signal for driving the switching element of the inverter 11 is generated, and the drive circuit 62 amplifies and converts the voltage into a voltage that can drive the switching elements SWU, SWV, SWW, SWX, SWY, SWZ, and drives the inverter 11. To control the brushless motor 2.

  By the way, when trying to detect the magnetic flux of the rotor of the brushless motor 2 using, for example, a Hall IC in the position detector 3 (3a, 3b, 3c) built in the brushless motor 2, the accuracy of mounting the Hall IC, For example, the position detector 3 is affected by the positional accuracy of mounting on the printed wiring board, the positional accuracy of fixing the printed wiring board to the brushless motor 2, the mechanical accuracy of the rotor of the brushless motor 2, the accuracy of magnetization, etc. The output signal has a phase shift with respect to the position of the rotor to be detected originally, that is, the position of the signal of the position detector 3 which should be relative to the induced voltage of the rotor. This deviation can often be as great as 10 degrees in electrical angle.

  The deviation of the signal of the position detector 3, that is, the detected value of the position of the rotor of the brushless motor 2, causes a decrease in efficiency when the brushless motor 2 is driven, and increases the heat generation of the brushless motor 2. In addition, this tendency increases as the rotation speed of the brushless motor 2 increases. In particular, the induced voltage of the brushless motor 2 is not negligible with respect to the power supply voltage, and becomes noticeable when the advance angle control is performed.

In order to prevent this, a sine wave voltage having a preset voltage and frequency is supplied to the brushless motor 2, and the phase of the sine wave voltage generated when the loop is driven and the output signal of the position detector 3. The amount of deviation from the phase is detected and stored in the storage means 5,
By performing feedback control based on the position signal output from the position detector 3 and correcting the sinusoidal voltage supplied to the brushless motor 2 based on the amount of displacement when the brushless motor 2 is driven. The position detector 3 is less affected by the displacement.

JP 2002-325480 A

  However, in such a conventional motor control device, the difference between the phase of the voltage on the sine wave generated when the brushless motor is driven in an open loop drive and the output signal of the position detector is used for storing and controlling. It does not measure the relationship of the position detector signal to the actual brushless motor induced voltage. Therefore, although it is possible to correct the phase difference of the signal with respect to the induced voltage of the position detector to some extent, it is difficult to cope with variations in load when detecting the phase difference of the signal of the position detector. When vector control is performed on a brushless motor from a low speed to a high speed, the influence on the reactive current control is large, particularly when the advance angle control is performed at a high speed, which may affect the controllability.

  Also, the load varies greatly depending on the amount of laundry, and when used in a drum-type washing machine or drum-type washing / drying machine that drives the brushless motor at low speed during washing or drying and at high speed during dehydration, the brushless motor is efficient. There is a problem that it is difficult to realize an efficient drum type washing machine or drum type washing and drying machine.

  The present invention solves the above-described conventional problems, and in a brushless motor control device, has a highly accurate detection position correction function of a position detector of a brushless motor, and drives the brushless motor efficiently from low speed to high speed. It is an object of the present invention to provide a motor control device and a drum-type washing machine or drum-type washing / drying machine using the same.

  In order to achieve the above object, according to the present invention, a motor control device includes: an inverter that drives a brushless motor; and an inverter that drives the brushless motor using an output signal of a position detector that detects a rotor position of the brushless motor. A control circuit for controlling the control circuit, and a storage means associated with the control circuit, the control circuit controlling a voltage applied to the plurality of windings of the brushless motor, and each of the plurality of windings. A voltage vector, which is a composition of applied voltages, is rotated more slowly in advance than during operation, and the direction of the voltage vector when the output signal of the position detector changes is detected, and the detected value of the direction of the voltage vector is predetermined. If it is outside the specified range, the abnormality is detected and the position detection correction is finished, and the detection value in the direction of the voltage vector is a predetermined range. In this case, the detected value of the direction of the voltage vector is stored in the storage means as a correction value of the position detection signal of the brushless motor, and the output signal of the position detector and the position detection signal of the position detection signal are operated during the operation of the brushless motor. A motor control device that controls the brushless motor using a correction value.

  As a result, even if the position detector signal with respect to the induced voltage has a deviation with respect to the position where it is originally desired, the amount of the deviation can be accurately corrected, and the position detector signal should be original. When the position is significantly deviated from the position, it is possible to take measures such as replacing the brushless motor by detecting it.

  The motor control device of the present invention and the drum-type washing machine or drum-type washing / drying machine using the motor control device have a highly accurate detection position correction function of the position detector of the brushless motor so that the brushless motor can be efficiently used from low speed to high speed. It is possible to realize a driving control device and a drum-type washing machine or a drum-type washing / drying machine using the control device.

The block diagram which shows the structure of the motor control apparatus of Embodiment 1 of this invention. The figure which shows the relationship between the induced voltage and position detection signal of a brushless motor in the motor control apparatus Diagram of ideal case of line induced voltage of brushless motor and position detector signal in the same motor controller Figure when the induced voltage between the brushless motor and the signal of the position detector are misaligned in the motor controller Figure when the induced voltage between the brushless motor and the signal of the position detector are misaligned in the motor controller Illustration of brushless motor model in the motor control device The figure which shows (Formula 1) for converting the applied voltage command Va * and Vb * on the ab axis | shaft of the brushless motor into the voltage Vu, Vv, and Vw in the same motor control apparatus. Block diagram showing the configuration of a conventional motor control device

  According to a first aspect of the present invention, there is provided a motor control device that uses a brushless motor, a position detector that detects a rotor position of the brushless motor, an inverter that drives the brushless motor, and an output signal of the position detector. A control circuit that controls the inverter that drives the control circuit, and a storage unit that accompanies the control circuit, the control circuit controlling a voltage applied to a plurality of windings of the brushless motor, and the brushless motor A voltage vector, which is a combination of voltages applied to each of the plurality of windings, is rotated more slowly in advance than during operation, and the direction of the voltage vector when the output signal of the position detector changes is detected. If the detected value of the vector direction is outside the predetermined range, an abnormality is detected and the position detection correction is terminated, and the voltage vector When the detected value of the direction of the voltage is within a predetermined range, the detected value of the direction of the voltage vector is stored in the storage means as a correction value of the position detection signal of the brushless motor. The brushless motor is controlled using the output signal of the detector and the correction value of the position detection signal.

  Thus, by performing a trial run for correcting the position detection signal in advance, the position detection signal that is the output of the position detector mounted on the brushless motor can be accurately corrected, and the position detection signal is more than the standard value. To realize a motor control device that can drive a brushless motor efficiently from low speed to high speed by detecting the detection of a brushless motor that has been greatly deviated and replacing the brushless motor. Can do.

The second invention is a brushless motor, a position detector that detects a rotor position of the brushless motor, an inverter that drives the brushless motor, and an output signal of the position detector that drives the brushless motor. A control circuit for controlling the inverter; and storage means attached to the control circuit, the control circuit controlling voltages applied to the plurality of windings of the brushless motor, and the plurality of the brushless motor. The voltage vector, which is the composition of the voltages applied to each of the windings, is rotated more slowly in advance than during operation, the brushless motor is rotated clockwise and counterclockwise, and the output signal of the position detector is rotated in each direction. The direction of the voltage vector at the time of change is detected, and an average value of the detected values in the direction of the voltage vector is determined in advance. If the detected value is outside the specified range, the abnormality is detected and the position detection correction is terminated. If the average value of the detected values in the direction of the voltage vector is within the predetermined range, the detected value in the direction of the voltage vector is The average value is stored in the storage means as a correction value of the position detection signal of the brushless motor, and the brushless motor is controlled using the output signal of the position detector and the correction value of the position detection signal during operation of the brushless motor. Is to do.

  As a result, by performing a trial run for correcting the position detection signal in advance, it is less affected by the friction of the shaft of the brushless motor or the load, and the position detection signal which is the output of the position detector mounted on the brushless motor. Can be corrected with high accuracy, and when a brushless motor whose position detection signal deviates significantly from the standard value is installed, it can be detected to take measures such as replacing the brushless motor. A motor control device that efficiently drives a brushless motor from high to high speed can be realized.

  A third invention is a brushless motor, a position detector that detects a rotor position of the brushless motor, an inverter that drives the brushless motor, and an output signal of the position detector that drives the brushless motor. A control circuit for controlling the inverter; and storage means attached to the control circuit, the control circuit controlling voltages applied to the plurality of windings of the brushless motor, and the plurality of the brushless motor. A voltage vector, which is a combination of voltages applied to each of the windings, is rotated more slowly in advance than during operation, and the direction of the voltage vector when the output signal of the position detector changes is the same as the number of pole pairs of the brushless motor. If the average value of the detected values in the voltage vector direction is outside the predetermined range, an abnormality is detected and When the detection correction is finished and the average value of the detected values in the direction of the voltage vector is within a predetermined range, the average value of the detected values in the direction of the voltage vector is corrected to the correction value of the position detection signal of the brushless motor. Is stored in the storage means, and the brushless motor is controlled using the output signal of the position detector and the correction value of the position detection signal during operation of the brushless motor.

  Thus, by performing a trial run for correcting the position detection signal in advance, it is less affected by variations in the position detection signal for each pole pair of the brushless motor, and is the output of the position detector mounted on the brushless motor. The position detection signal can be accurately corrected, and if a brushless motor with a position detection signal deviating greatly from the standard value is installed, measures such as replacing the brushless motor can be performed by detecting it. Thus, it is possible to realize a motor control device that efficiently drives a brushless motor from low speed to high speed.

  According to a fourth aspect of the present invention, in the first to third aspects of the present invention, when the position detection correction is terminated by detecting an abnormality, the control circuit does not use the position detection signal correction value and is set in advance. The initial value is used to operate the brushless motor. This prevents the brushless motor from operating with a correction value that deviates from the normal value.For example, after replacing a brushless motor with an abnormal position signal with a normal brushless motor, the brushless motor can be operated without performing position correction processing. Abnormal operation can be prevented when performing.

  In a fifth aspect based on the first to fourth aspects, the control circuit does not detect the correction value of the position detection signal with respect to the rotation speed of the voltage vector in the vicinity that detects the correction value of the position detection signal. The range is controlled to increase the rotation speed of the voltage vector. As a result, it is possible to reduce the time required for correcting the position detection signal in advance.

  According to a sixth aspect of the present invention, in the first to fifth aspects of the invention, the storage means is a non-volatile memory, so that the correction value of the position detection signal can be stored even when the brushless motor control device is turned off. Thus, it is possible to realize a motor control device that efficiently drives a brushless motor from a low speed to a high speed without performing a trial run again when the power is turned on again.

  In a seventh aspect of the invention, the brushless motor is driven at a high speed from the time of washing or drying at a low speed by mounting the motor control device of the first to sixth inventions on a drum type washing machine or a drum type washing and drying machine. The brushless motor can be driven efficiently until dehydration, and an efficient drum-type washing machine or drum-type washing / drying machine can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description. Further, the present invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a motor control device according to Embodiment 1 of the present invention. The inverter 11 for driving the brushless motor 2 includes switching elements SWU and SWX, SWV and SWY, two sets connected in series of SWW and SWZ, three sets in parallel, and a total of six switching elements. In FIG. 1, an IGBT is used as a switching element as an example. The connection point of a set of two switching elements, for example, the upper side (collector side) of the switching element SWX is connected to the lower side (emitter side) of the switching element SWU, and from that connection point to the winding of the brushless motor 2 It is connected. A position detector 3 is mounted on the brushless motor 2. This output signal CS is input to a control circuit 1 constituted by a microcomputer or the like, and used for speed control, torque control, etc. of the brushless motor 2.

  FIG. 1 is an example of the embodiment, and other switching elements such as MOSFETs and bipolar transistors can be used as the switching elements to be used.

  FIG. 2 is a diagram showing the relationship between the induced voltage of the brushless motor of the motor control apparatus according to Embodiment 1 of the present invention and the signal of the position detector. The windings of the brushless motor 2 are U phase, V phase, and W phase. When the rotor of the brushless motor 2 is rotated from the outside, the induced voltage generated at the U-phase winding terminal from the neutral point is Eu, the induced voltage generated at the V-phase winding is Ev, and the W-phase winding is The generated voltage is Ew. In general, the neutral point often does not appear as a terminal outside the brushless motor, and is often represented by a line voltage. The induced voltage generated at the U-phase winding terminal with respect to the W-phase winding terminal is Euw, the induced voltage generated at the V-phase winding terminal with respect to the U-phase winding terminal as Evu, and the V-phase winding terminal with Ewv is an induced voltage generated at the W-phase winding terminal as a reference.

  In general, three output signals from the position detector 3 are output in a three-phase brushless motor. CS1, CS2, and CS3 shown in FIG. 2 are examples of output signals of the position detector 3. CS1 is the above-described line-induced voltage Euw, CS2 is the line-induced voltage Evu, and CS3 is the line-induced voltage Ewv. This is a synchronized signal, that is, a signal whose logic changes when each line-induced voltage is 0 V (zero volts). In FIG. 2, the signal of the position detector 3 is synchronized with the induced voltage between the lines, but it may be a signal synchronized with Eu, Ev, Ew that is the induced voltage of each phase.

  The position detector 3 generally detects the magnetic flux of the magnet of the rotor of the brushless motor 2 or the magnetic flux of the magnet for position detection mounted coaxially with the rotor by a Hall element, Hall IC or the like. At this time, there are variations such as magnetization accuracy, mounting accuracy of the Hall element or Hall IC to the printed wiring board, accuracy of mounting the printed wiring board inside the motor, and detection sensitivity of the magnetic flux of the Hall element or Hall IC. The description will be given using the line induced voltage Euw of the brushless motor 2 described with reference to FIG. 2 and CS1 which is one of the output signals of the position detector 3.

FIG. 3 is an example of an ideal case diagram of the line induced voltage and the signal of the position detector. The position detection signal CS1 is synchronized with the line induced voltage Euw. That is, the logic of the position detection signal CS1 changes at a position where the line-to-line induced voltage is 0 V (zero volt) and zero crossing. 4 and 5 are examples of diagrams in the case where the line induced voltage and the signal of the position detector 3 are shifted. FIG. 4 shows an example in which the position detection signal CS1 advances with respect to the line induced voltage Euw, and FIG. 5 shows an example with a delay.

  The rotor position of the motor when controlling the brushless motor 2 is obtained by interpolating and calculating the rotor position for each control period using the signals CS1, CS2 and CS3 output from the position detector 3 described above. . Therefore, if the position detection signal is deviated as described above, the output voltage waveform distortion or the phase of the voltage phase advances or delays with respect to the position of the rotor of the brushless motor 2. . Further, when the induced voltage of the brushless motor 2 is relatively high with respect to the power supply voltage, the advance angle control is performed. In this case, there is a possibility that the performance may be adversely affected due to the shift of the position detection signal. is there. Hereinafter, a method for correcting the detection position of the position detector 3 by performing a trial run for correcting the position detection signal in advance will be described.

  FIG. 6 is an explanatory diagram showing a model of a brushless motor of the motor control device according to the first embodiment of the present invention. The relationship between the induced voltage and the output signal of the position detector when the brushless motor of FIG. 6 is rotated clockwise is as shown in FIG. FIG. 6 shows a two-pole model for ease of explanation. In the two-pole model, the electrical angle and the mechanical angle are the same value. The stator has three windings: a U-phase winding U, a V-phase winding V, and a W-phase winding W. A magnet is arranged on the rotor. Let us consider the rotation coordinate of the angle θ in the clockwise direction with the direction of the U phase of the winding as the origin. An axis a is set to an arbitrary angle θ, and an axis b is set to a coordinate axis in a direction orthogonal to the axis a. The magnetic pole inside the stator that is generated when a positive voltage is applied to the winding of each stator is defined as N pole.

  Now, when the voltage vector, which is the combined voltage of each winding, is set to the direction of the angle θ, that is, when the combined voltage is applied from the positive direction of the a-axis in FIG. A pole is generated in the negative direction of the a-axis. The rotor of the brushless motor 2 is attracted in the direction of the S pole in the positive direction of the a-axis and the N pole in the negative direction by the attraction and repulsion action with the magnetic poles of the stator. When the angle θ is slowly rotated in this state, the rotor of the brushless motor 2 also rotates slowly while maintaining the S pole in the positive direction of the a-axis and the N pole in the negative direction. When the angle θ is rotated, the output signal of the position detector 3 also changes as the rotor of the brushless motor 2 rotates. The difference of the angle θ when the output signal of the position detector 3 is changed from the original position is stored in the storage means 5 as a correction value. When detecting the correction value of the position detection signal of the brushless motor, a constant composite voltage is applied in the a-axis direction, and the change point of the signal of the position detector 3 is detected by slowly rotating the angle θ. Hereinafter, details of an example of voltage control at the time of detection and details of detection of the angle θ will be described.

  A voltage control method when detecting the correction value of the position detection signal of the brushless motor 2 will be described. Consider the voltage command of the detection ab axis. The a-axis voltage command is Va *, the b-axis voltage command is Vb *, and the voltage commands are Va * = V and Vb * = 0, respectively. V is V> 0. The angle θ between the winding U and the a axis is an arbitrary value. The applied voltage commands Va * and Vb * to the brushless motor 2 on the ab axis are converted into three-phase winding voltages Vu, Vv and Vw according to (Equation 1) shown in FIG. When the correction value of the position detection signal is detected, voltage control is performed by applying the voltages Vu, Vv, and Vw of the three-phase winding thus obtained to the brushless motor 2 from the inverter 11. By this voltage control, the voltage vector, which is a combination of the winding applied voltages, is controlled in the positive direction of the a-axis, and the angle θ is the direction of the voltage vector.

  Next, details of the method for detecting the direction θ of the voltage vector will be described. The detection of the change point from H to L of the signal CS1 during clockwise rotation will be described as a representative using the diagram showing the relationship between the induced voltage of the brushless motor and the output signal of the position detector shown in FIG.

  From FIG. 2, the position at the electrical angle of 30 degrees is an ideal position of the changing point from H to L of the signal CS1 at the time of clockwise rotation. Let this ideal position be θcs1 *. On the other hand, the voltage vector is slowly rotated while performing the voltage control. Specifically, the voltage vector is slowly rotated while performing voltage control so that the brushless motor 2 is rotated at a low speed of about 0.1 rpm with respect to the rotation speed of 500 rpm during washing. When the direction θ of the voltage vector is gradually increased, the rotor of the brushless motor 2 rotates clockwise, and CS1 which is one of the output signals of the position detector 3 changes from H to L around 30 °. The direction of the voltage vector at this time is θcs1. For example, as shown in FIG. 3, when the signal CS1 almost coincides with 0 V (zero volt) of the line induced voltage Euw, θcs1 is about 30 °.

  Also, as shown in FIG. 4, when the signal CS1 is ahead of the line induced voltage Euw, θcs1 is a value smaller than 30 °. Further, when the signal CS1 is delayed from the line induced voltage Euw as shown in FIG. 5, θcs1 becomes a value larger than 30 °.

  In the case of the relationship between the induced voltage and the position detection signal as shown in FIG. 2, the position information of the position detection signal generally changes every 60 ° in electrical angle. If the position detection signal and the induced voltage of the brushless motor 2 are guaranteed to have an accuracy of ± 10 °, for example, if the detected θcs1 is within ± 10 ° from the ideal position, the brushless motor 2 is a nonstandard product. Yes, if it exceeds ± 10 °, it is an abnormal product. If the detected θcs1 exceeds a predetermined value, an abnormality is detected and the position detection correction is terminated.

  When the detected θcs1 is in a normal range, θcs1 is stored in the storage unit 5 of FIG. 1 as a correction value of the position detection signal.

  The method for detecting the correction value of the position detection signal has been described above. When the brushless motor 2 is actually driven, for example, when the brushless motor 2 is driven in the clockwise direction, one of the position detection signals CS1 is changed from H. When the angle is changed to L, the brushless motor is obtained by using the correction value θcs1 of the position detection signal stored in advance in the storage unit 5 as angle information without using 30 ° which is the ideal position θcs1 *. 2 can be driven efficiently.

  For the sake of explanation, the change point of CS1 from H to L, which is one of the signals of the position detector 3 when the rotor of the brushless motor 2 is rotated clockwise, has been described, but the other signals CS2, CS3 and L to H The correction value of the position detection signal can be detected by the same method for the change point to.

(Embodiment 2)
When the correction value of the position detection signal described in the first embodiment is detected, for example, when the brushless motor 2 is connected to a load and affected by friction, the rotor of the brushless motor 2 is in the direction of the voltage vector. It is expected that the follow-up will be a little later than θ.

  Therefore, as a trial operation for correcting the position detection signal performed in advance, the brushless motor 2 is rotated clockwise and counterclockwise, and the direction of the voltage vector when the output signal of the position detector 3 changes in each rotation direction. Detection is performed. If the average value of the detected values exceeds a predetermined value, the position detection correction is terminated abnormally. If the average value of the detected values is within the predetermined value range, the average value of the detected values is brushless. By storing the correction value of the position detection signal of the motor 2 in the storage unit 5, it can be detected without being affected by friction and can be driven efficiently when the brushless motor 2 is driven.

(Embodiment 3)
When the brushless motor 2 is other than 2 poles, for example, 4 poles, the change point from CS to H of CS1 which is one of the position detection signals when the rotor described in the first embodiment is clockwise is the motor. There are two places with a mechanical angle of 180 ° apart. If the positions of the change points from H to L of the two signals CS1 are different, there is a possibility that the error of the correction value of the position detection signal becomes large if only one point is detected.

  In this case, the change point of CS1 from H to L of two position detection signals separated by 180 ° in mechanical angle is detected, and the position detection correction is performed when the average value of the detection values exceeds a predetermined value. If the average value of the detected values is within a predetermined value range, the average value of the detected values is stored in the storage means 5 as a correction value of the position detection signal of the brushless motor 2 to obtain 4 Even a polar brushless motor can be driven efficiently during driving.

  Similarly, even in a brushless motor having more poles, the voltage vector direction θ at the signal change point corresponding to the number of pole pairs is detected and stored in the storage means 5 so that the brushless motor 2 can be driven efficiently in the same manner. can do.

(Embodiment 4)
In the fourth embodiment, when the position detection correction is abnormally ended in the first to third embodiments, the correction value of the detected position detection signal is not used and is set in advance instead. The brushless motor 2 is operated using the initial value. This initial value is information on the position where the position detection signal should be originally. For example, in the case of the CS1 signal shown in FIG. 2, the place where H changes to L is information on the position where 30 ° should be. This prevents the operation of the brushless motor 2 with a correction value that deviates from the normal value when an abnormal signal is detected. For example, the position correction is performed after replacing a brushless motor with an abnormal position signal with a normal brushless motor. When the brushless motor is operated without performing the processing, the brushless motor 2 can be prevented from running out of control or abnormal operation such as excessive current.

(Embodiment 5)
In the first to fourth embodiments, when the correction value of the position detector 3 is detected, the direction of the voltage vector is changed slowly, and the brushless motor 2 is rotated slowly so that the correction value of the position detector 3 can be accurately obtained. Can be detected. On the other hand, when there are many change points of the position detection signal to be corrected, or when it is desired to detect an average value of a plurality of change points of the same signal as a correction value with a brushless motor having four or more poles as in the third embodiment, If the voltage vector is slowly rotated from the beginning to the end of detection of the correction value 2, the time required for correction of the position detector 3 becomes longer.

  In the fifth embodiment, the direction θ of the voltage vector changes slowly in the vicinity where the correction value of the position detector 3 is to be acquired, the brushless motor 2 is rotated slowly, and the voltage vector direction θ is changed in other portions. The brushless motor 2 is rotated quickly by changing it relatively quickly. By controlling in this way, the time taken to acquire the correction value of the position detector 3 can be shortened. Specifically, for example, it can be effectively realized by rotating the brushless motor 2 at about 0.1 rpm in the vicinity where the correction value is desired to be acquired and rotating at about 1 rpm in other portions.

(Embodiment 6)
In the sixth embodiment, the storage means 5 for storing the correction value of the position detection signal in the first to fifth embodiments is a nonvolatile memory. With this configuration, for example, the motor control device of the present invention corrects the position detection signal at the time of shipment from the factory, and stores the correction value of the position detection signal in the nonvolatile memory that is the storage means 5, thereby disconnecting the power supply. The correction value is stored, and the brushless motor 2 can be driven efficiently without correcting the position detection signal when the power is turned on again.

(Embodiment 7)
A drum-type washing machine that rotates and rotates a drum that contains laundry, and a drum-type washing and drying machine that also performs drying are driven at low speed and large torque during washing or drying, and at high speed and low torque during dehydration. is necessary. When a brushless motor is used as a drum driving motor of a drum-type washing machine or drum-type washing / drying machine, it is desired to increase the induced voltage to some extent in order to ensure efficiency during washing. For this reason, since the induced voltage of the brushless motor is relatively high with respect to the power supply voltage during dehydration, it is common to perform advance angle control. By mounting the motor control device according to any of the first to sixth embodiments on a drum-type washing machine or drum-type washing and drying machine, the drum can be driven efficiently, and an efficient drum-type washing machine or drum-type washing and drying is possible. Machine can be realized.

  As described above, the motor control device according to the present invention and the drum-type washing machine or the drum-type washing / drying machine using the motor control device are efficiently brushless from low speed to high speed without being affected by variations in the detection position of the position detector. Since the motor can be driven, it is useful not only for drum-type washing machines or drum-type washing / drying machines, but also for electrical equipment that has a large load variation and needs to rotate the motor from low speed to high speed. is there.

DESCRIPTION OF SYMBOLS 1 Control circuit 2 Brushless motor 3 Position detector 5 Memory | storage means 11 Inverter SWU, SWV, SWW, SWX, SWY, SWZ Switching element

Claims (7)

A brushless motor, a position detector that detects the rotor position of the brushless motor, an inverter that drives the brushless motor, and a control that controls the inverter that drives the brushless motor using an output signal of the position detector A circuit and storage means associated with the control circuit, wherein the control circuit controls a voltage applied to the plurality of windings of the brushless motor, and is applied to each of the plurality of windings of the brushless motor. The voltage vector, which is a composition of the voltage to be rotated, is rotated more slowly in advance than during operation, the direction of the voltage vector when the output signal of the position detector changes is detected, and the detected value of the direction of the voltage vector is determined in advance. If it is outside the specified range, an abnormality is detected and the position detection correction is completed, and the detected value in the direction of the voltage vector is determined in advance. If it is within the range, the detected value of the direction of the voltage vector is stored in the storage means as a correction value of the position detection signal of the brushless motor, and when the brushless motor is operated, the output signal of the position detector and the A motor control device having a detection position correction function of a position detector, which controls the brushless motor using a correction value of a position detection signal. A brushless motor, a position detector that detects the rotor position of the brushless motor, an inverter that drives the brushless motor, and a control that controls the inverter that drives the brushless motor using an output signal of the position detector A circuit and storage means associated with the control circuit, wherein the control circuit controls a voltage applied to the plurality of windings of the brushless motor, and is applied to each of the plurality of windings of the brushless motor. The voltage vector, which is a composition of the voltage to be rotated, is rotated more slowly than the time of operation in advance, the brushless motor is rotated clockwise and counterclockwise, and the output signal of the position detector is changed in each rotation direction. The direction of the voltage vector is detected, and the average value of the detected values in the direction of the voltage vector is predetermined. In the case other than the range, the abnormality is detected and the position detection correction is finished. When the average value of the detected values in the direction of the voltage vector is within a predetermined range, the average value of the detected values in the direction of the voltage vector Is stored in the storage means as a correction value of the position detection signal of the brushless motor, and the brushless motor is controlled using the output signal of the position detector and the correction value of the position detection signal during operation of the brushless motor. A motor control device having a detection position correction function of a position detector. A brushless motor, a position detector that detects the rotor position of the brushless motor, an inverter that drives the brushless motor, and a control that controls the inverter that drives the brushless motor using an output signal of the position detector A circuit and storage means associated with the control circuit, wherein the control circuit controls a voltage applied to the plurality of windings of the brushless motor, and is applied to each of the plurality of windings of the brushless motor. A voltage vector that is a composition of the voltage to be rotated in advance more slowly than during operation, and the direction of the voltage vector when the output signal of the position detector changes is detected in the same period as the number of pole pairs of the brushless motor, If the average value of the detected values in the direction of the voltage vector is outside the predetermined range, an abnormality is detected and the position detection correction is terminated. When the average value of the detected values in the direction of the voltage vector is within a predetermined range, the average value of the detected values in the direction of the voltage vector is used as the correction value for the position detection signal of the brushless motor. And a motor control device having a detection position correction function of the position detector, which controls the brushless motor using an output signal of the position detector and a correction value of the position detection signal during operation of the brushless motor. . The control circuit operates the brushless motor by using a preset initial value without using a correction value of a position detection signal when the position detection correction is completed after detecting an abnormality. The motor control apparatus of any one of -3. The control circuit controls the rotation speed of the voltage vector to be higher in a range where the correction value of the position detection signal is not detected than the rotation speed of the voltage vector in the vicinity where the correction value of the position detection signal is detected. The motor control apparatus of any one of -4. The motor control device according to claim 1, wherein the storage unit is a nonvolatile memory. A drum-type washing machine or a drum-type washing / drying machine comprising the motor control device according to claim 1.

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