Method for judging locked-rotor state of position-sensorless vector control permanent magnet synchronous motor

A permanent magnet synchronous motor and vector control technology, which is applied in the direction of controlling generators, vector control systems, and electromechanical brakes, etc., can solve problems such as narrow application range, low accuracy and troublesome judgment of locked rotor status, and achieve motor protection , Improve the effect of protection strategies

Active Publication Date: 2019-11-29
ZHONGSHAN BROAD OCEAN
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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for judging the locked-rotor state of a permanent magnet synchronous motor with vector control without a position sensor, which mainly solves the problem that th

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  • Method for judging locked-rotor state of position-sensorless vector control permanent magnet synchronous motor
  • Method for judging locked-rotor state of position-sensorless vector control permanent magnet synchronous motor
  • Method for judging locked-rotor state of position-sensorless vector control permanent magnet synchronous motor

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[0036] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0037] like figure 1 As shown in the figure, the basic working principle of the position sensorless vector control permanent magnet synchronous motor is briefly described (the textbook has a detailed description). The permanent magnet synchronous motor is regarded as the result of the interaction between the rotating magnetic field of the stator and the rotating magnetic field of the rotor. In the figure, there are two A coordinate system, one is the rotor rotating coordinate system dq axis; the other is the stator stationary coordinate system ABC coordinate system (which can be converted into a coordinate system with αβ perpendicular to each other); the rotor can be regarded as the action of the excitation current if to rotate at the rotational speed wr, the stator It can be regarded as the action of the excitation current is...

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Abstract

The invention discloses a method for judging a locked-rotor state of a position-sensorless vector control permanent magnet synchronous motor. The method comprises the steps of A, calculating input power Pin and output power Pout of the motor; B, calculating an error value ERR, wherein ERR=abs(Pin-K1*Pout), and K1 is a coefficient; C, judging whether ERR is greater than or equal to a certain presetvalue P0 or not, if so, returning to the step A, and if not, judging that the motor is in a locked-rotor state, namely, an abnormal steady-state closed-loop state, and entering a step D; and D, blocking the pulse signal output to the inverter by a motor microprocessor. According to the invention, the locked-rotor state of the motor can be accurately judged, the motor is prevented from still entering the steady-state closed-loop state when being changed into the locked-rotor state, the motor is enabled to be in a high-frequency small-amplitude oscillation state, a protection strategy is perfected, the motor is effectively protected, the judgment problem of the locked-rotor state is fundamentally solved, modification is not needed after load replacement, and great convenience is brought tousers.

Description

Technical field: [0001] The invention relates to a method for judging the locked-rotor state of a permanent magnet synchronous motor controlled by a position sensorless vector control. Background technique: [0002] The permanent magnet synchronous motor with Hall sensor can sense the rotor position and speed information through the Hall sensor at all times, so the whole control is stable and reliable, and it can also accurately judge the motor stall fault. However, the cost of the Hall sensor is high, the assembly process is complicated, and it cannot be used for a long time under harsh environmental conditions. At present, many manufacturers are gradually promoting permanent magnet synchronous motors without Hall sensors, which solves the disadvantages of Hall sensors and greatly expands the application range of permanent magnet synchronous motors. However, information such as the rotor position of the motor is obtained through complex algorithm estimation, which requires...

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Application Information

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IPC IPC(8): H02P21/14H02P21/24
CPCH02P21/14H02P21/24
Inventor 蓝竞豪边文清
Owner ZHONGSHAN BROAD OCEAN
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