Method for improving estimation accuracy of rotor position of permanent magnet synchronous motor

A permanent magnet synchronous motor, rotor position technology, applied in the control of generators, motor control, motor generator control and other directions, can solve the problems of increasing the computational burden and complexity of the system, and achieve simple and convenient implementation, 2nd harmonic content The effect of reducing and reducing the computational burden

Active Publication Date: 2017-05-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Modulate one of the signals to obtain the deviation related to the asymmetry of the motor parameters, and use it to compensate the position estimation error information in the modulation process of the other signal. This method

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  • Method for improving estimation accuracy of rotor position of permanent magnet synchronous motor
  • Method for improving estimation accuracy of rotor position of permanent magnet synchronous motor
  • Method for improving estimation accuracy of rotor position of permanent magnet synchronous motor

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0036] as attached figure 1 As shown, the present invention provides a method for improving the position estimation accuracy of a permanent magnet synchronous motor, which specifically includes the following steps:

[0037] Step 1) Inject a high-frequency cosine voltage U on the d-axis of the estimated rotor synchronous rotation coordinate system h cos(ω h t), where U h is the amplitude of the high-frequency voltage injected on the d-axis, ω h is the frequency of injecting high-frequency voltage on the d-axis, and t represents the current moment;

[0038] Step 2) To estimate the d-axis and q-axis voltage and Carry out Parker's inverse transformation to obtain the voltage u in the two-phase static α-β coordinate system α and u β , and then use the space vector pulse width modulation SVPWM to obtain six switching signals of the three-phase...

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Abstract

The invention discloses a method for improving the estimation accuracy of the rotor position of a permanent magnet synchronous motor. The method comprises the following steps: on the basis of realizing estimation of the rotor position of the permanent magnet synchronous motor by utilizing a pulse-shake high frequency voltage injection method, processing the extracted position estimation error function, eliminating a second harmonic component introduced due to asymmetric motor parameters, so as to obtain a processed position estimation error function, then establishing a phase-locked loop, and adjusting the phase-locked loop to be 0, thus obtaining estimated rotor speed and estimated rotor position. The method disclosed by the invention can effectively inhibit position estimation second harmonic error caused by the asymmetric motor parameters, and the performance of a control system without a position sensor can be improved.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a method for improving the estimation accuracy of the rotor position of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have been widely used in industry due to their small size, light weight, high power factor and superior control performance. Rotor position is the indispensable information for permanent magnet synchronous motor to realize vector control. Mechanical position sensors such as photoelectric encoder and resolver increase the volume, weight and cost of the control system. Therefore, the position sensorless control technology of permanent magnet synchronous motor is obtained. received widespread attention. Among them, the pulse vibration high-frequency voltage injection method is simple to implement, has good robustness, and is suitable for zero and low speed applications, so it attracts a large number of scholars t...

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Application Information

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IPC IPC(8): H02P21/18H02P21/24H02P25/022
CPCH02P2203/11H02P2207/05
Inventor 刘兵周波倪天恒
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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