Motor control device

A technology for control devices and electric motors, which is applied in the fields of motor control, motor generator control, AC motor control, etc., and can solve problems such as difficulty in detecting or estimating induced voltage, deterioration of detection accuracy and speed estimation accuracy, etc.

Inactive Publication Date: 2015-11-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, at low speeds where the induced voltage is small, it is difficult to detect or estimate the induced voltage, and there is a problem that the detection accuracy of the magnetic pole position of the rotor and the accuracy of speed estimation are degraded.

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0028] figure 1 It is a block diagram showing the configuration of the motor control device according to Embodiment 1 of the present invention. In Embodiment 1, the case where switching from synchronous current control to sensorless vector control via switching control, or switching from sensorless vector control to synchronous current control via switching control will be described. Case.

[0029] In addition, the so-called sensorless vector control refers to a method of estimating the rotation speed of the motor from the induced voltage of the motor without installing a position sensor in the motor, or even if a position sensor is installed in the motor without using the position sensor, and controlling the motor speed. The speed is controlled so that the estimated speed matches the speed command. In addition, the so-called synchronous current control refers to a method of controlling the motor speed so that the motor speed is controlled by providing an arbitrarily set syn...

Embodiment approach 2

[0066] Figure 5 It is a block diagram showing the configuration of a motor control device according to Embodiment 2 of the present invention. In addition, in Figure 5 in, right with figure 1 The same or equivalent structural elements shown in (Embodiment 1) are denoted by the same reference numerals. Here, the description will focus on the part related to the second embodiment.

[0067] In Embodiment 2, a case will be described in which the overall drive control is sensorless vector control, phase estimation error correction by a high-frequency superposition method is performed in the low-speed range, and phase estimation error correction is performed in the medium-to-high-speed range. In this method, the phase estimation error correction by the high-frequency superposition method is not performed, but the maximum efficiency control and the maximum torque control by only the sensorless vector control are performed. Here, the so-called sensorless vector control, which has...

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Abstract

To achieve smooth switching of control without fluctuations in speed and torque, an excitation current command is allowed to transit linearly or in accordance with the function of speed between a value under sensorless vector control and a value under low-speed region control in accordance with a speed command or estimated speed in a speed region where the control is switched or in an adjacent speed region where sensorless vector control is performed. Therefore, abrupt variations in excitation current are reduced before and after the switching of the control.

Description

technical field [0001] The invention relates to a motor control device. Background technique [0002] In order to control the motor at high speed and with high precision, it is necessary to generate a rotating magnetic flux corresponding to the magnetic pole position of the rotor. However, when a position sensor is used to detect the magnetic pole position, various problems such as high cost, vulnerability to vibration and heat, increase in size of the motor, increase in wiring, and limitation of wiring length arise. [0003] Therefore, a method of detecting the magnetic pole position without using a position sensor has been developed conventionally, and a method of estimating the magnetic pole position of the rotor using the induced voltage generated by the magnetic flux of the permanent magnet during rotation (sensorless vector control) is known. However, with this method, at low speeds where the induced voltage is small, detection or estimation of the induced voltage bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P27/04
CPCH02P21/0021H02P21/05H02P6/181H02P21/22H02P27/085H02P2207/05
Inventor 雨宫良之寺岛觉
Owner MITSUBISHI ELECTRIC CORP
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