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Motor control device

A motor control and motor technology, applied in the direction of control systems, current controllers, vector control systems, etc., can solve problems such as different and difficult system applications

Active Publication Date: 2013-03-27
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, from a practical point of view, the magnitude of the high-frequency current is determined depending on the parameters of the motor, so its influence varies depending on the motor used, and it is difficult to apply it universally to various systems.

Method used

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Experimental program
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no. 1 approach

[0030] Below, refer to Figure 1 to Figure 9 The first embodiment will be described. figure 1 It is a functional block diagram showing the configuration of the motor control device. The speed control unit 21 performs proportional integral (PI) or proportional integral derivative (PID) on the difference between the speed command value ω_ref given from the outside and the speed ωest of the motor 6 estimated by the magnetic pole position estimation unit 27 described later. control, thereby generating current command values ​​Id_ref and Iq_ref, and outputting these current command values ​​to the current control unit 22 . In addition, when the motor 6 is a permanent magnet motor such as a brushless DC motor and performs full excitation operation, the current command value Id_ref of the d-axis is set to zero.

[0031] The current control unit 22, like the speed control unit 21, performs PI or PI on the difference between the above-mentioned current command value and the d-axis cu...

no. 2 approach

[0061] Figure 10 2nd Embodiment is shown, the same code|symbol is attached|subjected to the same part as 1st Embodiment, and description is abbreviate|omitted, and a different part is demonstrated below. The second embodiment shows an example in which the duty of the three-phase PWM pattern is adjusted by the duty increase / decrease unit 11 incorporated in the PWM signal generation unit 9 . In the estimation method of the present embodiment, the larger the current differential value is, the higher the estimation accuracy of the magnetic pole position is, and the larger the S / N ratio is. However, on the other hand, when the current differential value becomes too large, noise corresponding to the PWM carrier frequency and electromagnetic noise increase.

[0062] Such as Figure 10 As shown, when passing Figure 5 When the load of all phases is uniformly reduced as shown in the graph, the high-frequency current amplitude (current differential value) decreases, and when adjuste...

no. 3 approach

[0068] Figure 11 to Figure 13 It is a figure explaining 3rd Embodiment, and only the part which differs from 1st Embodiment is demonstrated below. Such as Figure 11 As shown in the functional block diagram of , in the third embodiment, the magnetic pole position estimation unit 27 of the first embodiment is used as the first magnetic pole position estimation unit 27, and a second magnetic pole position estimation unit 41 (second magnetic pole position estimation unit 41) is further provided. inference unit, induced voltage detection unit). The second magnetic pole position estimating unit 41 calculates the induced voltage based on electrical characteristics such as the d-axis voltage Vd, the q-axis voltage Vq, the d-axis current Id, the q-axis current Iq, and the inductance and resistance of the winding of the motor 6, and calculates the induced voltage based on the electrical characteristics such as the inductance and resistance value of the winding of the motor 6. The ma...

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Abstract

The invention provides motor control device which reliably detects three-phase PWM signal pulses generated by a high frenquency component of two phase currents within the carrier period within a PWM control. According to the embodiments of the invention, a current detecting element is connected to a direct current side of an inverter circuit to generate a signal corresponding to a current value. A PWM signal generation unit generates a three-phase PWM signal pattern so that the current detection unit is capable of detecting two-phase currents twice in synchronization with four time-points within a carrier wave period of the PWM signal respectively and so that the current detection unit follows a magnetic pole position of the motor. A magnetic pole position estimation unit estimates a magnetic pole position of the motor based on the current differential values, when a current differential unit supplies, as current differential values, differences between twice detected current values regarding the two phases respectively.

Description

technical field [0001] An embodiment of the present invention relates to a motor control device that detects a phase current by a current detection element disposed in a DC portion of an inverter circuit. Background technique [0002] Conventionally, as a method of estimating the magnetic pole position of a motor, for example, a method of calculating an induced voltage proportional to the speed of the motor from voltage and current input to the motor and performing estimation from the induced voltage has been widely used. However, the method of estimating the speed and position from the induced voltage of the motor has a problem that although sufficient accuracy can be obtained in the high-speed range, accurate estimation cannot be performed in the extremely low-speed range where there is little induced voltage information. [0003] Therefore, several methods have been proposed in which an AC signal for sensing is applied to the motor regardless of the drive frequency, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08H02P6/18H02P6/06H02P6/08H02P6/16H02P6/182H02P6/28
CPCH02P6/18H02P21/26
Inventor 前川佐理
Owner KK TOSHIBA
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