A sensorless brushless DC motor freewheeling interference compensation method

A brushed DC motor, interference compensation technology, applied in the direction of electronic commutation motor control, electrical components, electronic commutator, etc., can solve the problem of no freewheeling interference compensation, and achieve the effect of eliminating freewheeling interference

Active Publication Date: 2021-05-28
HARBIN ENG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, the commutation correction strategy used in the article needs to detect the angle of freewheeling off-line, and cannot compensate for freewheeling interference in real time.

Method used

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  • A sensorless brushless DC motor freewheeling interference compensation method
  • A sensorless brushless DC motor freewheeling interference compensation method
  • A sensorless brushless DC motor freewheeling interference compensation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0067] The three-phase full-control bridge inverter circuit adopts the conduction mode of two-two, each power tube is turned on for 120°, and the phase is commutated every 60 degrees of electrical angle. The brushless DC motor used adopts a trapezoidal wave with a flat top of 120° back EMF, and the modulation method used is Hpwm-Lon. The frequency converter is IPM (PM50RL1A060), the core controller is FPGA (EP3C25Q240C8N), and the specific parameters of the motor are shown in Table 1.

[0068] Table 1 BLDC motor parameters

[0069]

[0070] Use the voltage sensor to sample the line voltage signal, make a difference, filter the line voltage difference signal, and the zero-crossing point of the filtered line voltage difference signal lags 30° as the commutation signal of the brushless DC motor position sensorless control system, but Due to the existence of the filter and the existence of the freewheeling interference signal, the obtained commutation signal has a certain erro...

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Abstract

A position sensorless brushless DC motor freewheeling interference compensation method relates to the field of brushless direct current motor control, in particular to a position sensorless brushless direct current motor freewheeling interference compensation method. A sensorless brushless DC motor freewheeling interference compensation method, comprising the following steps: (1) pre-positioning the brushless DC motor rotor, applying commutation logic to the brushless DC motor; (2) sampling the brushless DC motor wire The voltage difference signal is filtered to obtain the zero-crossing point of the line voltage difference, with a lag of 30°, which is used as a guidance signal for commutation; (3) When the motor reaches a certain speed, it is switched to run without a position sensor; (4) The freewheeling interference The compensation signal is superimposed with the sampled line voltage difference signal; (5) Calculate the phase delay angle caused by filtering according to the filtering parameters, and convert it into the corresponding time at the current speed to compensate the commutation signal. The invention eliminates the freewheeling interference of line voltage difference and realizes correct phase commutation.

Description

technical field [0001] The invention relates to the field of brushless direct current motor control, in particular to a freewheeling interference compensation method of a position sensorless brushless direct current motor. Background technique [0002] Brushless DC Motor, hereinafter referred to as BLDCM, is widely used in scientific instruments, industrial equipment and electric vehicles, and has the advantages of simple structure and high efficiency. The rotor position is one of the most important parameters in the three-phase six-state control strategy of BLDCM. Hall sensors, photoelectric encoders, and resolvers are commonly used to provide BLDCM commutation information. However, the sensor detection accuracy is easily affected by the external environment and installation accuracy. Therefore, the research on sensorless driving of brushless DC motors is of great significance for industrial applications and scientific research. [0003] The back EMF method is the most c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/18
CPCH02P6/182
Inventor 姚绪梁林浩鲁光旭赵继成胡心达张永奇李宏运黄乘齐姜奕舒马赫
Owner HARBIN ENG UNIV
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