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Position sensorless control method of permanent magnet motor

A technology of permanent magnet motor and control method, applied in electronic commutation motor control, control system, electronic commutator and other directions, can solve the problems of high frequency noise and low estimation accuracy

Active Publication Date: 2020-10-27
HARBIN INST OF TECH
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Problems solved by technology

[0005] Aiming at the problem that the high-frequency signal injection method adopted in the existing motor position sensorless control has low precision in estimating the rotor position and the existence of high-frequency noise, the present invention provides a position sensorless control method for permanent magnet motors

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  • Position sensorless control method of permanent magnet motor
  • Position sensorless control method of permanent magnet motor

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specific Embodiment approach 1

[0046] Specific implementation mode 1. Combination Figure 1 to Figure 4 As shown, the present invention provides a kind of permanent magnet motor position sensorless control method, and it comprises the following steps:

[0047] Step 1: Randomly select the axis system, injection position and injection sequence of four low-frequency orthogonal injection pulse signals to obtain a low-frequency orthogonal injection pulse sequence;

[0048] Step 2: Inject the low-frequency orthogonal injection pulse sequence into the shafting of the motor within the injection pulse period to obtain four pulse response currents, and process the four pulse response currents to obtain discrete rotor position signals; the injection At the beginning of the pulse period, the motor vector control feedback loop is interrupted, and at the end of the injected pulse period, the motor vector control feedback loop is restored;

[0049] Step 3: Use quadratic interpolation to fit the discrete rotor position si...

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Abstract

The invention relates to a permanent magnet motor sensorless control method based on low-frequency orthogonal random pulse signal injection, belonging to the technical field of motor sensorless control. The permanent magnet motor sensorless control method aims at the problems that the estimation precision of the rotor position by employing a high-frequency signal injection method adopted in the existing motor sensorless control is not high and high-frequency noise exists. The method comprises the following steps of: randomly selecting a shafting, an injection position and an injection sequenceof a low-frequency orthogonal random pulse signal, generating the low-frequency orthogonal random pulse signal in the selected shafting, injecting the low-frequency orthogonal random pulse signal into a motor, extracting a pulse response current, processing the pulse response current obtained by sampling to obtain a discrete position demodulation signal containing position information, and finally performing linear fitting processing and operation on the discrete demodulation signal to obtain smooth and continuous position and rotation speed information; and finally, taking the position and rotation speed information as closed-loop control. The permanent magnet motor sensorless control method based on low-frequency orthogonal random pulse signal injection has no position convergence problem and ensures the better steady-state performance.

Description

technical field [0001] The invention relates to a position sensorless control method of a permanent magnet motor, and belongs to the technical field of motor position sensorless control. Background technique [0002] For the control technology of permanent magnet synchronous motor, the most widely used is vector control technology. In vector control, the position information of the rotor is needed to decouple the field control and torque control. The traditional method to obtain the rotor position information of the permanent magnet synchronous motor is to install a position sensor. However, the signal of the sensor is easily disturbed by the external environment. Communication lines between systems are susceptible to electromagnetic interference, wear and tear, and even disconnection, which affects the environmental adaptability of permanent magnet synchronous motors. At the same time, for the servo control system, the high-precision position sensor is also quite expensiv...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/18
CPCH02P6/183
Inventor 张国强王高林周洪雷王奇维丁大尉徐殿国
Owner HARBIN INST OF TECH
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