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A Synchronous Sampling Device for Motor AC Power Using Resolver Quadrature Output

A technology of synchronous sampling and electric quantity, which is applied in the control of electromechanical transmission, control of generators, motor control, etc., can solve the problems of poor motor control performance, position error, and increased controller cost, so as to simplify calculation steps and eliminate position error , the effect of precise extraction

Active Publication Date: 2018-10-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, the acquisition of the rotor position of the motor is generally completed by adding a hardware decoding chip. This method will not only increase the cost of the controller, but also easily introduce the position when obtaining the rotor position through arctangent during the decoding process. Error; for current acquisition, Hall elements are used. Although the current sampling accuracy is high, it is difficult to ensure that the motor rotor position and motor AC power are synchronized at the beginning and end of the acquisition during the sampling process.
The inaccuracy of the rotor position of the motor and the asynchrony of the two samples will cause deviations in the current vector used in the closed-loop control, resulting in a decrease in the dynamic performance of the permanent magnet synchronous motor vector control
When the motor runs at high speed, the current vector deviation further increases, making the motor control performance worse and even difficult to maintain system stability

Method used

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  • A Synchronous Sampling Device for Motor AC Power Using Resolver Quadrature Output
  • A Synchronous Sampling Device for Motor AC Power Using Resolver Quadrature Output
  • A Synchronous Sampling Device for Motor AC Power Using Resolver Quadrature Output

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Experimental program
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Embodiment 1

[0044] Such as figure 1 Shown is a block diagram of a new permanent magnet synchronous motor vector control system including the device of the present invention, wherein the present invention is the part inside the dotted line box in the figure. The motor AC power synchronous sampling device of the present invention includes a motor rotor position detection module 1, a motor power detection module 2 and a synchronous conversion module 3, wherein the motor rotor position detection module 1 is used to output a time-synchronized motor rotor position signal, and the motor The rotor position signal includes the cosine signal and the sine signal of the rotor position of the motor; the motor power detection module 2 is used to output at least two time-synchronized motor power signals; The sampling time interval between them is used to obtain the AC power of the synchronous motor at time k. In this embodiment, the motor power detection module 2 is a motor phase current detection modu...

Embodiment 2

[0077] The motor AC power synchronous sampling device in this embodiment may further include a harmonic signal synchronous extraction module for synchronously extracting harmonic signals of various orders according to the motor rotor position signal and the motor AC power signal. In this embodiment, the harmonic signal synchronous extraction module is a harmonic current synchronous extraction module 4, and the structural diagram of this module is as follows Figure 5 As shown, it includes a double-angle conversion unit 41 , a harmonic current synchronous conversion unit 42 and a low-pass filter unit 43 .

[0078] The specific process of the harmonic signal synchronous extraction module is as follows:

[0079] First, according to the current position cosine / sine value Calculate the cosine / sine value (cos(nθ), sin(nθ)) required by the nth harmonic transformation according to the double angle formula:

[0080]

[0081]

[0082] Second, according to the current current sa...

Embodiment 3

[0088] In the synchronous sampling device for motor AC power in this embodiment, the motor power detection module is a motor phase voltage detection module or a motor line voltage detection module, which can be used to realize synchronous sampling of motor phase voltage or line voltage.

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Abstract

The invention relates to a motor alternating-current electricity quantity synchronous sampling device fully utilizing rotary transformation orthogonal output. The device comprises a motor rotor position detecting module, a motor electricity quantity detecting module and a synchronous conversion module. The motor rotor position detecting module is used for outputting motor rotor position signals synchronous in time, and the motor rotor position signals comprise the cosine signals and sinusoidal signals of the motor rotor position. The motor electricity quantity detecting module is used for outputting at least two paths of motor electricity quantity signals synchronous in time. The synchronous conversion module is used for acquiring the synchronous motor alternating-current electricity quantity at the moment k according to the motor rotor position signals, the motor alternating-current electricity quantity signals and the sampling time interval between the motor rotor position signals and the motor alternating-current electricity quantity signals. Compared with the prior art, delay between motor alternating-current electricity quantity sampling and rotor position sampling can be effectively overcome, motor alternating-current electricity quantity synchronous sampling in the true sense is achieved, and then a good foundation is laid for high dynamic performance vehicle motor vector control.

Description

technical field [0001] The invention relates to a control device of a permanent magnet synchronous motor for vehicles, in particular to a synchronous sampling device for alternating current electric power of a motor which fully utilizes the quadrature output of a resolver. Background technique [0002] Permanent magnet synchronous motors are widely used in electric vehicles due to their advantages of high power density, wide speed range of constant torque and high efficiency, and the key to promote their application is vector control technology. Vector control achieves real-time precise control of the motor torque by directly controlling the magnitude and phase of the stator current vector i_s in the d-q synchronous coordinate system, making the permanent magnet synchronous motor obtain a dynamic performance comparable to that of a DC motor. One of the necessary links in the vector control is to accurately collect the stator phase current and convert it into the current vect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P21/18
CPCH02P21/14H02P2203/03
Inventor 钟再敏江尚陈振挺周水华
Owner TONGJI UNIV