Brushless direct current motor control method based on magnetic linkage tracking

A brushed DC motor and control method technology, applied in the direction of torque ripple control, etc., can solve the problems of complexity, limitation, and influence on the utilization rate of DC bus voltage, etc., and achieve the effect of natural transition and small calculation amount

Inactive Publication Date: 2013-07-31
XIAMEN UNIV
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  • Application Information

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Problems solved by technology

In fact, the linear modulation scheme based on space voltage vector modulation technology (SVPWM) has been developed very maturely, but because the traditional SVPWM-based over-modulation strategy algorithm is too co

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  • Brushless direct current motor control method based on magnetic linkage tracking
  • Brushless direct current motor control method based on magnetic linkage tracking
  • Brushless direct current motor control method based on magnetic linkage tracking

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Embodiment Construction

[0028] The present invention will be further described below through specific embodiments.

[0029] Compared with the brushed DC motor, the biggest difference between the brushless DC motor and the brushed DC motor is that the mechanical commutation is replaced by the electronic commutation. The armature, while the brushless DC motor converts the DC current into a quasi-square wave current through an electronic commutator and sends it to the armature.

[0030] However, since the harmonic component contained in the six-beat wave will generate the sixth harmonic torque, under the condition of large torque, this ripple may be filtered out by the rotor inertia. However, under the condition of small torque, it will cause the rotor speed to fluctuate, seriously affecting the stability of the speed, and will also have a certain impact on the positioning accuracy and repeatability of the position servo system.

[0031] Exploring the process of motor speed regulation, it will be found...

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Abstract

A brushless direct current motor control method based on magnetic linkage tracking comprises the steps of determining a reference magnetic linkage psi (n) according to expected rotating speed w and an expected torque Tp of a brushless direct current motor, constructing a virtual magnetic linkage according to an incremental model to approach to the reference magnetic linkage psi (n), and finally controlling an inverter to output to obtain required PWM (pulse-width modulation) drive according to a state corresponding to an approaching result. The method utilizes a magnetic linkage tracking technology, and can automatically realize seamless switch from overmodulation (six-beat-wave) output to linear modulation output. When the brushless direct current motor operates in a large torque state, a controller outputs six-beat-wave level to allow the motor to have the maximum direct current bus voltage utilization ratio; and when the motor operates in a small torque state, the controller can be smoothly switched to a PWM wave state with the output subjected to linear modulation so as to allow the motor to run stably.

Description

technical field [0001] The invention relates to a modulation method of a brushless DC motor speed controller, in particular to a brushless DC motor control method based on flux linkage tracking that can effectively reduce motor torque ripple under small torque conditions. Background technique [0002] At present, as the concept of green and environmental protection is becoming more and more popular, electric vehicles, as a clean and environmentally friendly means of transportation that can achieve zero emissions and zero pollution, are increasingly being valued by people. However, the brushless DC motor speed-regulating controller used in the existing electric vehicles still has many problems during work. Among them, the motor torque ripple in the case of small torque is an important defect factor. [0003] The traditional brushless DC motor speed controller always works in the output six-beat mode to simulate the mechanical commutation of the traditional DC motor and outpu...

Claims

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Application Information

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IPC IPC(8): H02P6/10
Inventor 吴德会陈俊李超游德海
Owner XIAMEN UNIV
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