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motor control unit

A technology for control devices and motors, applied in motor control, electronic commutation motor control, control systems, etc., can solve problems such as small amplitude of induced voltage and decrease in electrical angle accuracy

Active Publication Date: 2018-09-07
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conversely, when the motor is at a low speed, the amplitude of the induced voltage is small, and the accuracy of the estimated electrical angle is significantly reduced due to the influence of voltage disturbances such as inverter dead time and switching noise.

Method used

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Embodiment approach 1

[0019] FIG. 1-1 is a diagram showing a configuration example of Embodiment 1 of the motor control device according to the present invention. A synchronous motor control device 1 shown in FIG. 1-1 is connected to an inverter 2 , a current detection unit 3 , and an encoder 5 (position sensor). The inverter 2 and the encoder 5 are connected to the motor 4 , and the current detection unit 3 is arranged between the inverter 2 and the motor 4 . In addition, as the motor 4, for example, a permanent magnet type synchronous motor is used.

[0020] The synchronous motor control device 1 shown in Fig. 1-1 has a speed command unit 11, a speed control unit 13, a current control unit 15, coordinate conversion units 17, 22, a PWM processing unit 19, a speed conversion unit 7, and an electrical angle conversion unit 8 , an electrical angle estimation unit 24 , and a switching unit 26 .

[0021] Here, the configuration of a conventional motor control device is referred to. 1-2 is a diagram ...

Embodiment approach 2

[0096] In Embodiment 1, the electrical angle estimating unit 24 is configured by a magnetic flux observer, but in this embodiment, an induced voltage is obtained from a motor voltage and a motor current to estimate an electrical angle. The circuit equation of the permanent magnet synchronous motor is represented by the following formula (11). In addition, this equation (11) is an equation on the rotating coordinates.

[0097] 【Equation 11】

[0098]

[0099] Here, the subscripts are set to dd and qq to distinguish them from normal two-axis orthogonal rotation coordinates in which the motor rotor magnetic flux is aligned with the d-axis. That is, the dd axis and the qq axis are the axes of the two-axis orthogonal rotation coordinates, but are coordinate axes having a phase difference from the d axis and the q axis. In addition, R is the winding resistance of the motor, L is the inductance, ω re is the electrical angular frequency and p is the differentiation operator. The...

Embodiment approach 3

[0113] In this embodiment, a motor control device including an electrical angle estimating unit 24 a instead of the electrical angle estimating unit 24 in Embodiments 1 and 2 will be described. The electrical angle estimating unit 24a can switch whether or not to use the speed signal 10 from the encoder of the electrical angle estimating unit. In addition, it is the same structure as Embodiment 1, 2 except having provided the electrical angle estimation part 24a instead of the electrical angle estimation part 24.

[0114] 2-3 is a diagram showing the configuration of the electrical angle estimation unit 24a. The electrical angle estimating unit 24 a shown in FIGS. 2-3 differs from the electrical angle estimating unit 24 in Embodiments 1 and 2 in that it includes a determination unit 114 and an electrical angular frequency switching unit 116 .

[0115] The determination unit 114 calculates the absolute value of the electrical angle frequency, and outputs the instruction signal...

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Abstract

In order to obtain a synchronous motor even without convex polarity, it is possible to detect the disc misalignment fault quickly after the start of the action and suppress the abnormal action of the motor control device, characterized in that it has: a motor speed detection department, which detects and outputs the motor detection speed according to the output signal of the encoder (position sensor) connected to the motor as a synchronous motor; Motor electric angle detection department, which detects and outputs the electric angle of the motor according to the output signal of the encoder; Motor electric angle presumption part, which takes the motor voltage and motor current, and the motor detection speed as input, according to the motor voltage and motor current, the motor presumptive electric angle is presumed and output; And the switching part, which will detect the motor angle and the motor presumed electric angle as input, according to the motor detection angle and the motor presumed electric angle, determine whether the encoder is in normal action, the motor will detect the electric angle output when the encoder is normally operating, and the motor will be presumed to output the electric angle when the encoder is not operating normally.

Description

technical field [0001] The invention relates to a motor control device. Background technique [0002] Conventionally, permanent magnet synchronous motors, winding field type synchronous motors, and synchronous reluctance motors are known as synchronous motors in which the frequency of the current or voltage of the rotor and the stator is synchronized. [0003] For example, Patent Document 1 discloses a technique of estimating an electrical angle based on an induced voltage of a motor and performing failure discrimination using an estimated electrical angle based on a circuit model. Generally, the higher the motor speed, the larger the amplitude of the induced voltage of the motor. Conversely, when the motor is at a low speed, the amplitude of the induced voltage is small, and the accuracy of the estimated electrical angle is significantly reduced due to the influence of voltage disturbance such as inverter dead time and switching noise. Therefore, the technique described i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/17H02P6/18H02P29/024H02P6/16H02P6/08H02P6/182H02P6/28H02P29/028
CPCH02P6/16H02P6/18H02P2207/05H02P29/0241H02P6/181H02P6/17
Inventor 古谷真一佐野修也堀井启太竹居宽人稻妻一哉
Owner MITSUBISHI ELECTRIC CORP
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