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Method for processing current static deviation of permanent magnet motor

A technology of static deviation, permanent magnet motor, applied in the direction of measuring current/voltage, electronic commutation motor control, electrical components, etc., can solve the problems of high-precision torque control of the motor, unfavorable heat dissipation, current signal deviation, etc., to achieve the scope of application Wide, reduce the current deviation, the effect of simple equipment

Inactive Publication Date: 2012-07-04
SHANGHAI DAJUN TECH
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Problems solved by technology

Due to the relatively large impact of analog sampling on the environment, coupled with the consistency and bias of the components themselves, there is a deviation in the detected current signal. If this deviation is not processed, in the control, it will be on the motor winding. Generate current bias due to detection error, which is unfavorable for high-precision torque control and heat dissipation of the motor

Method used

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  • Method for processing current static deviation of permanent magnet motor
  • Method for processing current static deviation of permanent magnet motor
  • Method for processing current static deviation of permanent magnet motor

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Embodiment 1

[0016] A method for processing the current static deviation of a permanent magnet motor, comprising three steps of initialization, current detection, and calculation of the current static deviation in sequence, and the specific steps are as follows:

[0017] Current sampling is performed during initialization. The flow of current sampling is as follows: figure 1 As shown, the current sampling is carried out sequentially through the CPU to control the current sensor as follows: a. Read the current variable value of the analog / digital sampling channel, b. Repeat step a at least 2 times, this embodiment repeats 8 times, c. The obtained current variable values ​​are averaged for filtering to reduce interference, and the average value is i 0 ;

[0018] The flow of detection current and current deviation calculation is as follows: figure 2 As shown, when the current is detected, when the timer interrupt ends, the CPU controls the current sensor to read the current variable value ...

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Abstract

The invention relates to the field of current detecting methods, in particular to a method for processing current static deviation of a permanent magnet motor. The method for processing current static deviation of the permanent magnet motor comprises an initializing step and a current detecting step which are carried out successively, and is characterized in that after current is detected, current static deviation is calculated, and current is sampled during initialization so that i0 is measured; i' is measured when the current is detected; and an actual value of the current is obtained when the current static deviation is calculated. The method has the advantages that required equipment is simple, steps are simple, precision is high, and application range is wide.

Description

technical field [0001] The invention relates to the field of current detection methods, in particular to a method for processing the current static deviation of a permanent magnet motor. Background technique [0002] Based on the precise control of the current and torque of the permanent magnet synchronous motor, the current sampling is required to have a certain accuracy. In the previous permanent magnet synchronous motor control system, the current sampling method generally adopts the method of current sensor plus analog circuit sampling, and the real current value is taken as the actual current value by subtracting the theoretical deviation value from the real-time detected current value. Due to the relatively large impact of analog sampling on the environment, coupled with the consistency and bias of the components themselves, there is a deviation in the detected current signal. If this deviation is not processed, in the control, it will be on the motor winding. The cur...

Claims

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Application Information

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IPC IPC(8): H02P6/00G01R19/00
Inventor 赵洪涛舒吉祥徐性怡
Owner SHANGHAI DAJUN TECH
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