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Motor control apparatus, control method thereof, and computer readable medium

A control device and motor technology, applied in the direction of AC motor control, control system, vector control system, etc., can solve the problems of waveform deformation of current command value, bad influence of motor control, etc., and achieve the effect of avoiding switching noise

Active Publication Date: 2019-12-10
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the waveform of the current command value is deformed by the correction of the current command value, which may have a bad influence on the motor control.
In addition, in the motor control device disclosed in Japanese Patent Application Laid-Open No. 2008-265645, when the duty ratio changes, switching noise of the inverter cannot be avoided, which may adversely affect the motor control.

Method used

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  • Motor control apparatus, control method thereof, and computer readable medium
  • Motor control apparatus, control method thereof, and computer readable medium
  • Motor control apparatus, control method thereof, and computer readable medium

Examples

Experimental program
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Effect test

Embodiment approach 1

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is a block diagram showing a schematic system configuration of the motor control device according to Embodiment 1 of the present invention. The motor control device 1 according to Embodiment 1 controls a three-phase AC motor 11 . The three-phase AC motor 11 has, for example, a rotor and a stator, and is composed of U-phase, V-phase, and W-phase.

[0022] The motor control device 1 according to Embodiment 1 includes an inverter 2, a current sensor 3, an AD converter 4, a dq-axis current generation unit 5, a calculation unit 6, a current control unit 7, an angle sensor 8, and a dq / three-phase conversion unit. 9 and the carrier modulation unit 10.

[0023] It should be noted that the motor control device 1 is composed of hardware, for example, centering on a microcomputer. The microcomputer includes a CPU (Central Processing Unit: Central Processing Unit) for p...

Embodiment approach 2

[0078] In Embodiment 2 of the present invention, when the AD converter 4 determines that the amplitude A of the current command value from the calculation unit 6 is equal to or greater than the threshold value At, other than the above-mentioned timings of t=τ / 8 and 3τ / 8, The phase current value is obtained from the current sensor 3 at the timing of time t=5τ / 8 and 7τ / 8, and the obtained phase current value is converted into a digital AD conversion value. In this way, a plurality of phase current values ​​are acquired, each of the acquired phase current values ​​is converted into an AD converted value, and an average value of the AD converted value is calculated to average the AD converted value, thereby further improving AD conversion accuracy.

[0079] Figure 6 It is a diagram showing the timing of switching of three phases when the current command value is large. Figure 6 Among them, the vertical axis is the time t, representing one period of the PWM signal=τ. The horizo...

Embodiment approach 3

[0096] In Embodiment 3 described above, the AD converter 4 converts the phase current values ​​of the three phases into digital AD converted values, but the present invention is not limited thereto. For example, when an inexpensive AD converter is used, when the cycle of PWM is short, the conversion time of the AD converter is long, and it is difficult to convert the phase current values ​​of the three phases into digital AD conversion values.

[0097] In this case, the AD converter 4 may convert only the phase current values ​​of the two phases into digital AD conversion values. The AD converter 4 can calculate the AD conversion value of the remaining one phase using the following equation (the sum of the current values ​​of the three phases=0).

[0098] Iu+Iv+Iw=0

[0099] The AD converter 4 converts, for example, U-phase and V-phase phase current values ​​into digital AD converted values, and calculates the remaining W-phase AD converted values ​​using the above formula. ...

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PUM

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Abstract

The invention provides a motor control apparatus, a control method thereof, and a computer readable medium. The motor control apparatus includes an inverter comprising switching elements; current detection means for detecting a phase current value output from the inverter to each phase of a three-phase AC motor; conversion means for converting the phase current value into a digital AD conversion value; and current control means for controlling the three-phase AC motor by switching the switching elements of the inverter using a current command value based on the AD conversion value, wherein when the conversion means determines that an amplitude of the current command value is greater than or equal to a threshold, it acquires the phase current value at timings of t=[tau] / 8 and 3[tau] / 8 and / or at timings of t=5[tau] / 8 and 7[tau] / 8, where [tau] is one cycle of a PWM signal, converts the acquired phase current value into the AD conversion value, and then outputs it, and when the conversionmeans determines that the amplitude of the current command value is smaller than the threshold, it acquires the phase current value at a timing of t=[tau] / 2, converts the acquired phase current valueinto the AD conversion value, and then outputs it.

Description

technical field [0001] The present invention relates to a motor control device for controlling a three-phase AC motor, a control method and a program for the motor control device. Background technique [0002] There is known a motor control device that converts a phase current value for a three-phase AC motor detected by a current sensor into a digital AD conversion value, generates a current command value based on the converted AD conversion value, and generates a current command value based on the current command value to switch the switching elements of the inverter and control the three-phase AC motor (for example, Japanese Patent Laid-Open No. 2010-148301 and Japanese Patent Laid-Open No. 2008-265645). [0003] The motor control device disclosed in JP 2010-148301 A corrects a current command value in order to avoid switching noise of the inverter. However, the waveform of the current command value is deformed by the correction of the current command value, which may ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08
CPCH02P27/085H02P21/06H02P21/22H02P27/08H02M7/53873H02M7/5395H02M1/0012H02M1/0009H02P27/14
Inventor 佐佐木优野村祐喜
Owner TOYOTA JIDOSHA KK