KR101046354B1 - Motor and motor drive system, motor drive circuit device, method for driving motor and semiconductor integrated circuit device - Google Patents

Abstract

The present invention is to drive a fan motor, such as an air conditioner or a refrigerator, a compressor driving motor and a pump motor with a relatively simple circuit with low noise.

To this end, in the present invention, in the phase conversion of the motor, the first conducting phase is brought into a full conduction state, and the second conducting phase to be converted is controlled by a first pulse width modulation signal so that the first conducting phase in the overlap period is the second pulse. Motor driving circuit device characterized in that the control by the width modulation signal. The noise and vibration of the motor are reduced by smoothly changing the steep motor current during phase change.

Description

MOTOR AND MOTOR DRIVE SYSTEM, MOTOR DRIVE CIRCUIT DEVICE, METHOD FOR DRIVING MOTOR AND SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor driving circuit device, a motor driving method, and a semiconductor integrated circuit device. For example, a fan motor such as an air conditioner or a hot water heater and a compressor of an air conditioner or a refrigerator are provided. The present invention relates to a motor driving circuit device, a motor driving method, and a semiconductor integrated circuit device suitable for a motor and a pump used for supplying a refrigerant.

In recent years in household appliances such as air conditioners and refrigerators, there is a great demand for low noise. One of the causes is noise and vibration generated from motors such as fan motors and compressors. Some of the noise and vibration of the motor may be caused by the method of driving the motor.

In the above technical field, a method of driving a motor by directly driving an inverter with a rectified voltage rectified with a commercial power source or a DC voltage corresponding thereto has been expanded. This method aims at increasing the efficiency and miniaturization of the motor, and is intended to reduce the current consumed by driving the motor at a high voltage, thereby preventing an increase in losses due to internal resistance or the like. Moreover, since the wiring diameter of a motor winding can be made small, it is advantageous for miniaturization of a motor.

On the other hand, in order to drive a brushless motor, an inverter device is required, but in the field of home appliances, etc., price competition has intensified, and there is a demand for the provision of a cheap inverter device. For this reason, in an inverter drive device of a brushless motor, an inexpensive 120 degree energization method that uses a simple circuit configuration and relatively high motor efficiency is used.

In the 120-degree current-carrying motor driving circuit, the magnetic pole position detector is used to detect the magnetic pole position by the rotor magnetic pole position detector of the motor, and the respective switching elements of the inverter device are turned on / off at the timing at which the rotor and stator poles coincide. Drive the motor.

The magnetic pole position detection of the rotor generally uses a Hall element to which the Hall effect is applied, or a Hall IC incorporating an amplifier in the Hall element. The current is passed through the detection signal by logically multiplying 120 degrees out of 180 degrees in the electrical angle. That is, the remaining 60 degrees perform the same operation as turning off the inverter output. Therefore, immediately after the motor current i is turned on / off, a current waveform having a very high change amount di / dt is obtained. By di / dt, the electromagnetic force generated in the stator changes, the motor winding vibrates and becomes an electromagnetic sound and is released to the outside.

In addition, since the frequency of the electronic sound is proportional to the number of motor revolutions and the number of poles of the motor, it is several Hz to several hundred Hz in the actual motor rotational region. This frequency is noisy because it is within the human audible frequency range.

In addition, incorporating a large amount of harmonic components in the motor current waveform generally causes pulsation in the motor torque. Since motor torque basically consists of multiplying the motor's intrinsic induced voltage and motor current, it is highly dependent on the motor current waveform. By the torque pulsation, the motor itself vibrates, causing the mount to install the motor to vibrate, and this vibration becomes a noise.

As a method for reducing noise, there is a method of making the motor driving current into a sinusoidal shape by so-called PWM (Pulse Width Modulation) control. Specifically, the magnetic flux of the stator poles of the motor is detected by the Hall element to obtain a sinusoidal signal. The PWM signal is obtained by comparing the sinusoidal signal with the carrier signal which is the output signal of the carrier generator. By turning on / off the inverter device by the PWM signal, the motor current is controlled to the sine wave shape.

However, when a microcomputer or the like is used, a high speed arithmetic processing corresponding to a PWM cycle is required, which results in a complicated and expensive system compared with the 120 degree energization method.

Japanese Laid-Open Patent Publication No. 22721081 is an example in which an inexpensive 120-degree energization method has studied an energization method, paying particular attention during energization conversion in order to alleviate the motor current having a large amount of change.

[Patent Document 1]

Japanese Patent No. 2721081

In the method described in Japanese Patent No. 271081, the suppression of the amount of change in the current of the motor current is performed by PWM switching control so that the phase-to-phase voltage during phase conversion becomes approximately zero. The amount of current change is determined by the impedance.

In order to further suppress the amount of change, the impedance should be reduced as much as possible. However, the decrease in the impedance of the coil is not easy because it affects the performance of the motor. On the other hand, the low impedance of the switching element is required to increase the performance of the element. do.

Therefore, it was not easy to provide a low vibration, low noise motor drive device at low cost.

The present invention has been made in view of the above, and an object thereof is to provide a motor driving circuit device and a motor driving method capable of suppressing pulsation of a motor torque which is proportional to the motor current, thereby reducing vibration and noise. The present invention provides a semiconductor integrated circuit device.

In the driving circuit apparatus or the driving method of the motor according to the present invention, in the phase conversion, the first conducting side has an energized state without pulse width modulation control, and the state in which the second conducting side to be converted is pulse width modulated. It has a fixed period which the said 1st electricity supply side and the 2nd electricity supply side overlap, and the 1st electricity supply side in the said overlap period is an electricity supply period with respect to the ratio of the electricity supply and the interruption | blocking in the said pulse width modulation signal. It is characterized by controlling by a pulse width modulated signal at a rate of shorter and longer interruption period.

As a result, since the positive voltage is intermittently applied to the interphase voltage during phase conversion instead of approximately zero, the current change can be made gentler than the case where the approximately zero phase voltage is approximately zero.

By pulse width modulation control of the power converter for supplying driving power to the motor based on these signals, noise generated by the motor is reduced by a relatively simple circuit or method. Examples of the power converter include an inverter for converting DC power into AC power by turning on / off a semiconductor switching element.

According to the motor drive circuit device according to the present invention, the circuit for driving the motor with low noise is monolithically formed on one semiconductor chip without increasing the chip size. The monolithic semiconductor integrated circuit can be incorporated in the box body of the motor together with the magnetic pole position detector.

The motor drive circuit device according to the present invention may be provided outside the box body of the motor, or may be housed in a resin case and modularized. The position of the magnetic pole may be estimated by so-called sensorless without using a magnetic pole position detector or the like.

According to the present invention, in order to smooth the inclination of the current change occurring during the phase conversion, the motor circuit and the switching element can be controlled by the driving circuit without adjusting the performance, thereby maintaining the versatility of the motor driving apparatus. In addition, it is possible to provide a motor driving circuit device, a motor driving method, and a semiconductor integrated circuit device which are more inexpensive and smaller in size, with a low vibration and low noise motor driving device.

The purpose of reducing vibration and noise by suppressing pulsation in proportion to the motor current is realized with a simple configuration.

(Example 1)

1 shows a motor driving circuit device and an motor driving system including the present circuit and a motor as an embodiment of the present invention.

In Fig. 1, the motor 4 is a three-phase brushless motor. The motor 4 is a motor having a permanent magnet in the rotor, and includes a hall element 5 as a means for detecting the magnetic pole position of the permanent magnet by detecting the magnetic flux generated by the permanent magnet. The hall element 5 is provided for each phase, and is provided so that the phase difference of the electrical angle of each phase may be 120 degree | times. The pseudo sine wave signal obtained from the hall element 5 is converted into logic signals HU, HV, HW by the drive circuit 6. Further, in order to obtain a predetermined overlap period depending on the position of the magnetic pole, the phase signal of the hall signal is logically signaled by the driving circuit 6. An overlap period of about 30 degrees is obtained with the electric angle.

On the other hand, the motor input terminal, that is, the stator winding of the motor 4 is connected to the inverter device 3. The inverter device 3 has a circuit in which six switching elements such as a power MOSFET and an insulated gate bipolar transistor (IGBT) are combined. The direct current power source serving as the power source of the inverter device 3 is obtained by rectifying the commercial power supply 1 of the AC by the rectifier 2. On / off of each switching element of the inverter device 3 is controlled by the inverter drive device 8.

In this embodiment, the drive circuit 6 within the range surrounded by the broken line is formed in the monolithic semiconductor integrated circuit device. Moreover, the drive circuit 6 and the magnetic pole position detector 5 in the range enclosed by the dashed-dotted line are built in the motor 4, and are integrated as a brushless motor with a drive circuit.

Hereinafter, the driving method of the motor 4 by the inverter apparatus 3 in FIG. 1 is demonstrated using the operation waveform diagram of FIG.

The position detection signal group h (HU, HV, HW) of the magnetic poles in the normal rotation of the motor 4 of FIG. 1 has an electrical angle of 120 degrees as in the position detection signals HU, HV, HW of FIG. It is a logic signal maintaining the phase difference.

On the other hand, since the position detection signal group h has information on the speed of the motor 4 (for example, the period of the pulse signal, etc.), the position detection signal HW is converted into a frequency-voltage converter (F / V). The voltage is converted into a voltage by (15) to obtain a DC voltage component corresponding to the actual speed. In the present embodiment, the position detection signal HW is used for speed detection, but a plurality of signals among HU or HV, or HU, HV, and HW may be used.

The speed control arithmetic processing means 13 (e.g., an arithmetic processing apparatus such as a microcomputer) is set in the DC voltage component that is the output of the frequency-voltage converter 15, that is, the speed signal and the speed control arithmetic processing means 13. Compare the speed command and output the deviation. In this way, the output signal output by the speed control arithmetic processing means 13 is a current command signal a of the motor 4 which is a DC voltage signal.

The current command signal a is compared with the triangular wave signal generated by the carrier generator 14 by the comparator 10 to obtain a rectangular wave signal that becomes d1. This rectangular wave signal is a pulse width modulation signal.

On the other hand, the current command signal a is amplified by the amplifier 11 serving as the gain A to obtain the second current command signal b. Here, the integer A is less than 1.0. Experience has also shown that around 0.5 is optimal.

The second current command signal b is compared by the comparator 10 with a triangular wave signal generated by the carrier generator 14 to obtain a rectangular wave signal of d2. This rectangular wave signal is a pulse width modulation signal.

Here, when the energization / disruption ratios of the first pulse width modulated signal d1 and the second pulse width modulated signal d2 are compared, the relationship is d1> d2.

The signal obtained by ORing three images with respect to the overlap signal obtained first is c1. In addition, the signal obtained by superimposing c1 and d1 on the second pulse width modulation signal becomes c2.

The signal groups of d1, c2, and HU, HV, and HW are distributed by the waveform selector 9 to the gates of the six switching elements so as to form the pattern of FIG.

At this time, the distribution rule gives the following four conditions at every 1 / 6th cycle based on the 120 degree energization method.

1) Immediately after the phase change occurs, the first pulse modulated signal d1 is given.

2) After a 1/6 cycle has elapsed from the phase conversion, a full energized signal based on the position detection signal is given.

3) Immediately after the phase change to the next phase, the second pulse modulated signal d2 is given during the overlap period.

4) The period of 1) to 3) gives a blocking signal.

The six signals distributed by the above are input to the inverter drive device 8, and each switching element of the inverter device 3 is controlled on / off.

FIG. 3 is a diagram showing the operation before and after the phase change in the voltage and current applied to the motor coil by the above pattern.

Here, the state where the conversion from the U phase to the V phase has occurred is shown. Since the signal of the U phase upper arm is high, a DC voltage is given to the U phase coil from the power supply. At this time, the signal of the W phase lower arm is repeatedly energized / blocked in the pulse width modulation state. As a result, current flows through the U-phase coil, and the current reaches a predetermined level.

Next, a transition is made from U phase to V phase. The U phase is controlled by the second pulse width modulated signal. On the other hand, the V phase upper arm is controlled by the first pulse width modulated signal, but does not contribute to the coil current of the U phase. What affects the U phase current is the voltage applied to the coil between the U phase and the W phase. In this case, since the voltages between the UW phases overlap only as much as the voltage of the second pulse width modulation signal, the U phase current repeats a state in which the current drops when the voltage between the UW phases is approximately zero, and the current increases when energized. Here, by setting the current carrying ratio lower than the current carrying / breaking ratio of the first pulse width modulated signal, the current finally becomes zero. By controlling the energization ratio of the second pulse width modulated signal, the inclination of the motor current can be changed. That is, when the gain A of the amplifier 11 approaches zero, the slope of the current changes to the slope when the phase-to-phase voltage is approximately zero, while when the gain approaches 1.0, the slope that the current attenuates smoothly. can do.

If the current slope is set gently, the torque pulsation becomes flatter and acts in the direction of suppressing vibration, but the cross point where the current becomes zero is delayed, and a large deviation occurs between the current phase and the phase of the counter electromotive voltage of the motor. There is work to do. As a result, reactive power is generated and the motor efficiency is lowered. Therefore, there is a relationship between motor efficiency and trade off. It is empirically confirmed that the balanced performance is obtained by setting the gain A of the amplifier 11 to about 0.5.

By the above configuration, the rotational speed of the motor is controlled so as to match the speed instruction of the speed control calculation processing means 13. That is, when the motor rotation speed is smaller than the speed command value, the magnitude of the current command signal a is raised. This increases the energization duty ratio in the pulse width modulated signal. As a result, the output current of the inverter device 3 increases and the torque of the motor increases, so that the motor accelerates and the rotational speed matches the speed command value. When the motor rotational speed becomes larger than the speed command value, the magnitude of the current command signal a is reduced, the motor is decelerated by the operation opposite to the above, and the rotational speed coincides with the speed command value.

According to the present embodiment, the control device can be configured relatively simply without using a complicated calculation method, such as one amplifier, two comparators, one carrier generator, and a plurality of logic circuits of the signal selecting means. Therefore, the drive circuit is simplified, and the drive device of the brushless motor can be miniaturized. In addition, by simplifying the circuit, the generation of the PWM signal conventionally performed by the speed control arithmetic processing means (microcomputer, etc.) can be performed by the control circuit integrally formed in the drive circuit 6 in which the inverter device 3 is formed. have. That is, the monolithic IC can be made into a PWM control circuit, an inverter driver (a driver circuit of a switching element), and an inverter main circuit.

As a result, the load on arithmetic processing apparatus such as a microcomputer which performs various control or status monitoring of the motor drive system is reduced. Therefore, a small or inexpensive computing processing device can be used. If the speed command value setting circuit and the circuit having the function of generating the current command signal a as described above are incorporated in the drive circuit 6, the speed control arithmetic processing means 13 becomes unnecessary.

In the present embodiment, the drive circuit 6 in the frame enclosed by the broken lines is shown in the monolithic semiconductor integrated circuit device, but may be monolithic except for the inverter device 3. In this case, since the capacity of the inverter device can be freely selected, there is the convenience of handling motors of various capacities.

(Example 2)

Next, another Example is described using FIG. This embodiment differs from the first embodiment in obtaining an overlap period. The overlap period sets a constant time regardless of the position of the magnetic poles.

In Example 1, in order to obtain the position of the magnetic pole, it was necessary to obtain a signal of a weak sine wave shape of several hundred mV output by the Hall element. Depending on the configuration of the system, it is effective for the case where the installation place of the motor and the control device is not in the vicinity and is easily affected by noise by surrounding the weak signal wiring.

In FIG. 4, the signal of the Hall element 5 is logically signaled (HU, HV, HW) by the comparator 10. From the hall signal of each phase, the signal is converted into a logic signal synchronized with rising and falling edges. This corresponds to a high / low signal of 1/6 periods. In synchronism with the edge of this signal, when the one-shot pulse signal having a predetermined time is generated, the overlap signal c1 similar to that of FIG. 2 is obtained. However, since this signal is irrelevant to the position of the magnetic pole, it is not constant as an electric angle, that is, it is not affected by the rotational speed of the motor 4.

Therefore, when the rotation speed is sufficiently low, the influence of the overlap period is hardly affected, and the effect of flattening the torque pulsation is not sufficiently obtained. On the other hand, when the rotation speed is sufficiently high, the overlap period is in a continuous state, resulting in a phase shift between the motor current and the induced voltage, and there is an effect that the efficiency cannot be sufficiently obtained.

Therefore, in the second embodiment, the condition that the overlap time must be optimally set for the rated rotational speed of the motor 4 is required. However, under a specific load such as a pump or a fan, the condition is not a major obstacle. In addition, since there are fewer circuit components, it is advantageous in terms of cost.

The advantages of monolithic inverter devices are as follows.

(1) Since the inverter device is compact, it can be incorporated in a motor.

(2) Since the inverter device can be incorporated in a motor, it is not necessary to pull out the position detection signal out of the motor, and the lead-out wiring can be omitted.

(3) Since the distance between the position detection circuit and the inverter device is short and the position detection signal is a logic signal, the noise content can be increased with respect to the dv / dt noise of the output voltage of the inverter device.

(4) According to the monolithic inverter device, the nonuniformity of the amplifier for amplifying the motor current command is improved, so that the nonuniformity of the conduction ratio of the first pulse width modulated signal and the second pulse width modulated signal can be easily improved. Can be.

(5) Since the current command of the motor can be controlled by one DC voltage signal, the lead-out wiring from the motor can be simplified.

(Example 3)

5 shows an embodiment of a motor incorporating a drive circuit 6 having a motor drive circuit in consideration of the above advantages.

In Fig. 5, the drive circuit 6 with the inverter device according to the present invention, the magnetic pole position detector (hall element) 5 and the peripheral circuit of the rotor are provided on the circuit board 54. In addition, although the position detector 5 is shown upward for convenience, it is actually installed in the back of a board | substrate, and makes it easy to detect the magnetic pole of a rotor. The stator 52 made of a motor winding having the winding input terminal 58 is connected to the winding input terminal 58 and the circuit board side motor output terminal 57 by an insulated motor winding wiring 56, Secure the substrate and stator.

These are inserted into the box body 55 of the motor, and the motor input / output wiring 59 is drawn out of the box body from the circuit board 54. The permanent magnet rotor 53 is provided inside the stator by providing an appropriate gap so as not to contact the stator 52. Further, the box body 51 of the motor 4 is fitted in to fix the shaft of the rotor. The box body 55 may be replaced with a sealing material such as resin.

In the motor input / output wiring 59 drawn out of the box body 55, the minimum number of wirings required to drive the motor 4 is for the motor driving high voltage power supply + side,-side (ground), and monolithic integrated circuit. The control power supply + side, the motor current control input signal, and the motor rotation output signal are all five. Therefore, compared with the case where the motor drive circuit is provided outside the box body 55, the number of wirings is greatly reduced.

By using a brushless motor that realizes small noise and low noise according to each of the above-described embodiments, the following effects are found in household appliances or industrial equipment such as a hot water heater, an air cleaner (air cleaner), a washing machine, a pump, and the like.

(1) Since the motor is low in noise, vibration damping devices (dustproof rubber, etc.) can be reduced.

(2) The apparatus is miniaturized by the reduction of the vibration preventing device.

(3) No need to worry about the reliability of the anti-vibration device.

(Example 4)

6 shows a cross section of a monolithic semiconductor integrated circuit in which a motor driving circuit according to the present invention is formed. The integrated circuit is formed on a dielectric separator substrate.

As shown in the art figure, the dielectric (insulator), the silicon oxide (SiO ₂₎ (42) to the covered single-crystal Figure 44, the semiconductor switching element (IGBT) constituting the inverter device 3 in FIG. 1 or the high-speed diode An electric element constituting the inverter drive device 8 or another circuit for generating a PWM signal is formed. The elements are connected by conductor wiring 43 such as aluminum. Each single crystallinity 44 is electrically insulated and separated by the silicon oxide film 42 and supported by polycrystalline silicon covering the outer side of the single crystallinity 44 and the silicon oxide film 42.

In addition, the formation of a single crystallinity which is electrically insulated and separated may use a SOI (Sil1con On Insulator) technique.

FIG. 7 illustrates a planar pattern of the monolithic semiconductor integrated circuit of FIG. 6. There are regions where six high speed diodes 46 are provided adjacent to each other, and regions where six IGBTs (Insulated Gate Bipolar Transistors) 47 are provided adjacent to each other, and the inverter device is configured by these semiconductor elements. Adjacent to the area where the IGBT is provided, an inverter drive device for controlling these IGBTs on / off or an IGBT drive circuit and a logic circuit 48 for generating a PWM signal are formed in the area. The above embodiment is applied to the IGBT driving circuit and the logic circuit 48. For this reason, the IGBT drive circuit and the logic circuit 48 have a relatively simple circuit configuration even though they include an inverter drive device and a circuit for generating a PWM signal, thereby reducing the area of the IGBT drive circuit and the logic circuit 48. Can be. Thus, with a small chip size, it is possible to monolithic the inverter device, the inverter driver and the circuit for generating the PWM signal.

By using a brushless motor that realizes small noise and low noise according to each of the above embodiments, it is used in household appliances or industrial equipment such as a hot water heater, an air cleaner (air cleaner), a washing machine, a pump, and the like.

The motor driving method may also be used for small motors used in hard disk drives, flexible disk drives, magneto-optical disk drives, CD-ROM drives, digital video disk drives, copiers, printers, facsimiles, and video camera devices. .

1 is a view showing a motor driving circuit device and a motor driving system including the present circuit and a motor according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating operation waveforms of respective units in FIG. 1;

FIG. 3 is a view showing an operation waveform of each part when a phase change from U phase to V phase in FIG. 2 occurs; FIG.

4 is a view showing a motor driving circuit device and a motor driving system including the present circuit and a motor according to another embodiment of the present invention;

5 is an exploded perspective view showing a motor incorporating a monolithic semiconductor integrated circuit according to the present invention;

6 is a cross-sectional view showing a dielectric separation substrate of a monolithic semiconductor integrated circuit in which a motor driving circuit according to the present invention is formed;

7 is a view showing a planar pattern of a monolithic semiconductor integrated circuit according to the present invention.

[Description of Drawings]

1: commercial power 2: rectifier

3: inverter device 4: 3-phase brushless motor

5: magnetic pole position detector 6: driving circuit

7: Motor with inverter device and motor pole position detector

8: drive device of inverter output circuit 9: waveform selector

10: comparator 11: amplifier

12: logical product circuit

13: Speed control processing unit (microcomputer)

14: carrier generator 15: frequency-to-voltage converter (F / V)

16: overlap period generation circuit 41: polycrystalline silicon substrate

42 silicon oxide film (SiO ₂ ) 43 aluminum wiring

44: monocrystalline 45: monolithic integrated circuit chip

46: fast diode 47: IGBT

48: IGBT drive circuit and logic circuit 51, 55: motor box body

52: stator 53: rotor

54: circuit board 56: wiring of the motor winding

57: motor output terminal of the circuit board side 58: winding input terminal

59: motor input and output wiring

Claims (14)

A power converter for supplying driving power of pulse width modulation control to a plurality of coils of the motor; Speed control calculation means for outputting a current command signal calculated on the basis of a deviation between the rotational speed of the motor and the speed command value; First pulse width modulated signal generating means for generating a first pulse width modulated signal from a current command signal and a carrier wave from said speed control calculating means; Second pulse width modulated signal generating means for generating a second pulse width modulated signal from a signal obtained by amplifying the current command signal from the speed control calculating means and a carrier wave; Means for generating a predetermined overlap period at the time of image conversion based on the magnetic pole position of the motor; A first energized phase during input of a signal obtained by multiplying the second pulse width modulated signal by an overlap period, the first pulse width modulated signal, and the magnetic pole position signal of the motor and converting a phase generated based on the magnetic pole position of the motor. Selects a full energized state at the second, selects the first pulse width modulated signal on the second energized state to be converted, selects the second pulse width modulated signal on the first energized state in the overlap period, and outputs it as a selection signal Signal selection means for And pulse width modulation control means for pulse width modulation controlling the power converter based on a selection signal from the signal selection means. The method of claim 1, And the overlap period is fixed at an electric angle. The method of claim 1, And the overlap period is fixed at a fixed time. Semiconductor chip, A plurality of semiconductor switching elements which are turned on / off by pulse width modulation control formed in the semiconductor chip and supply electric power to a motor; Speed control calculation means for outputting a current command signal calculated on the basis of a deviation between the rotational speed of the motor and the speed command value; First pulse width modulated signal generating means for generating a first pulse width modulated signal from a current command signal and a carrier wave from said speed control calculating means; Second pulse width modulated signal generating means for generating a second pulse width modulated signal from a signal obtained by amplifying the current command signal from the speed control calculating means and a carrier wave; Means for generating a predetermined overlap period at the time of image conversion based on the magnetic pole position of the motor; A first energized phase during input of a signal obtained by multiplying the second pulse width modulated signal by an overlap period, the first pulse width modulated signal, and the magnetic pole position signal of the motor and converting a phase generated based on the magnetic pole position of the motor. Selects a full energized state at the second, selects the first pulse width modulated signal on the second energized state to be converted, selects the second pulse width modulated signal on the first energized state in the overlap period, and outputs it as a selection signal Signal selection means for And pulse width modulation control means for pulse width modulation controlling the power converter based on a selection signal from said signal selection means. Motor, A power converter for supplying driving power with pulse width modulation control to the motor; Speed control calculation means for outputting a current command signal calculated on the basis of a deviation between the rotational speed of the motor and the speed command value; First pulse width modulated signal generating means for generating a first pulse width modulated signal from a current command signal and a carrier wave from said speed control calculating means; Second pulse width modulated signal generating means for generating a second pulse width modulated signal from a signal obtained by amplifying the current command signal from the speed control calculating means and a carrier wave; Means for generating a predetermined overlap period at the time of image conversion based on the magnetic pole position of the motor; A first energized phase during input of a signal obtained by multiplying the second pulse width modulated signal by an overlap period, the first pulse width modulated signal, and the magnetic pole position signal of the motor and converting a phase generated based on the magnetic pole position of the motor. Selects a full energized state at the second, selects the first pulse width modulated signal on the second energized state to be converted, selects the second pulse width modulated signal on the first energized state in the overlap period, and outputs it as a selection signal Signal selection means for And pulse width modulation control means for pulse width modulation controlling the power converter based on a selection signal from the signal selection means. In a motor having a rotor and a stator, and a box body for storing the rotor and the stator, A magnetic pole position detector and a motor driving circuit for detecting the magnetic pole position of the rotor are built in the box body, A power converter configured to supply driving power of the motor driving circuit with pulse width modulation control to the motor; Speed control calculation means for outputting a current command signal calculated on the basis of a deviation between the rotational speed of the motor and the speed command value; First pulse width modulated signal generating means for generating a first pulse width modulated signal from a current command signal and a carrier wave from said speed control calculating means; Second pulse width modulated signal generating means for generating a second pulse width modulated signal from a signal obtained by amplifying the current command signal from the speed control calculating means and a carrier wave; Means for generating a predetermined overlap period at the time of image conversion based on the magnetic pole position of the motor; A first energized phase during input of a signal obtained by multiplying the second pulse width modulated signal by an overlap period, the first pulse width modulated signal, and the magnetic pole position signal of the motor and converting a phase generated based on the magnetic pole position of the motor. Selects a full energized state at the second, selects the first pulse width modulated signal on the second energized state to be converted, selects the second pulse width modulated signal on the first energized state in the overlap period, and outputs it as a selection signal Signal selection means for And a pulse width modulation control means for pulse width modulation controlling the power converter based on a selection signal from the signal selection means. The method of claim 6, A motor driving circuit incorporated in the box includes a semiconductor circuit device, and the semiconductor circuit device is turned on / off by pulse width modulation control formed on a semiconductor chip, and supplies a plurality of semiconductor switching elements to supply power to the motor. The motor characterized by the above-mentioned. In a motor driving method for driving a motor by a power conversion device controlled pulse width modulation, Prepare a current command signal calculated on the basis of the deviation between the rotational speed of the motor and the speed command value, Generating a first pulse width modulated signal from the current command signal and a carrier wave, A second pulse width modulated signal is generated from the amplified signal and the carrier; Based on the magnetic pole position of the motor, a predetermined overlap period is generated at the time of image conversion, Inputting a signal obtained by multiplying the second pulse width modulated signal by an overlap period, the first pulse width modulated signal, and the magnetic pole position signal of the motor, and converting the image generated based on the magnetic pole position of the motor; A selection made by selecting a full energized state on the energized state, selecting the first pulse width modulated signal on the second energized state to be converted, and selecting the second pulse width modulated signal on the first energized state in the overlap period Create a signal, And a pulse width modulation control of the power converter based on the selection signal. A power converter for supplying driving power of pulse width modulation control to a plurality of coils of the motor; Speed control calculation means for outputting a current command signal calculated on the basis of a deviation between the estimated rotational speed of the motor and the speed command value; First pulse width modulated signal generating means for generating a first pulse width modulated signal from a current command signal and a carrier wave from said speed control calculating means; Second pulse width modulated signal generating means for generating a second pulse width modulated signal from a signal obtained by amplifying the current command signal from the speed control calculating means and a carrier wave; Means for generating a predetermined overlap period upon conversion of an image based on the estimated magnetic pole position of the motor; Inputting a signal obtained by logically multiplying the second pulse width modulation signal by an overlap period, the first pulse width modulation signal, and an estimated magnetic pole position signal of the motor, and converting the image generated based on the estimated magnetic pole position of the motor; A full energized state is selected on energization, the first pulse width modulated signal is selected on a second electrified current to be converted, and the second pulse width modulated signal is selected and selected on a first energization during the overlap period. Signal selecting means for outputting as a signal; And pulse width modulation control means for pulse width modulation controlling the power converter based on a selection signal from the signal selection means. The method of claim 9, And the overlap period is fixed at an estimated electric angle. The method of claim 9, And the overlap period is fixed at a fixed time. Semiconductor chip, A plurality of semiconductor switching elements which are turned on / off by pulse width modulation control formed in the semiconductor chip and supply electric power to a motor; Speed control calculation means for outputting a current command signal calculated on the basis of a deviation between the estimated rotational speed of the motor and the speed command value; First pulse width modulated signal generating means for generating a first pulse width modulated signal from a current command signal and a carrier wave from said speed control calculating means; Second pulse width modulated signal generating means for generating a second pulse width modulated signal from a signal obtained by amplifying the current command signal from the speed control calculating means and a carrier wave; Means for generating a predetermined overlap period upon conversion of an image based on the estimated magnetic pole position of the motor; Inputting a signal obtained by logically multiplying the second pulse width modulation signal by an overlap period, the first pulse width modulation signal, and an estimated magnetic pole position signal of the motor, and converting the image generated based on the estimated magnetic pole position of the motor; A full energized state is selected on energization, the first pulse width modulated signal is selected on a second electrified current to be converted, and the second pulse width modulated signal is selected and selected on a first energization during the overlap period. Signal selecting means for outputting as a signal; And pulse width modulation control means for pulse width modulation controlling the power converter based on a selection signal from said signal selection means. In a motor having a rotor and a stator, and a box body for storing the rotor and the stator, A power conversion device in which a motor driving circuit is built in the box body, and the motor driving circuit supplies driving power with pulse width modulation control to the motor; Speed control calculation means for outputting a current command signal calculated on the basis of a deviation between the estimated rotational speed of the motor and the speed command value; First pulse width modulated signal generating means for generating a first pulse width modulated signal from a current command signal and a carrier wave from said speed control calculating means; Second pulse width modulated signal generating means for generating a second pulse width modulated signal from a signal obtained by amplifying the current command signal from the speed control calculating means and a carrier wave; Means for generating a predetermined overlap period upon conversion of an image based on the estimated magnetic pole position of the motor; The first pulse width modulation signal and the estimated stimulus position signal of the motor are inputted by logically multiplying the second pulse width modulated signal by the overlap period, and the first phase is converted upon image generation based on the estimated stimulus position of the motor. A full energized state is selected on energization, the first pulse width modulated signal is selected on a second electrified current to be converted, and the second pulse width modulated signal is selected and selected on a first energization during the overlap period. Signal selecting means for outputting as a signal; And a pulse width modulation control means for pulse width modulation controlling the power converter on the basis of a selection signal from the signal selection means. The method of claim 13, The motor driving circuit incorporated in the box includes a semiconductor circuit device, and the semiconductor circuit device is turned on / off by pulse width modulation control formed on a semiconductor chip, and supplies a plurality of semiconductor switching elements to supply power to the motor. A motor comprising:

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