Electric vehicle brushless motor controller

Abstract

The invention relates to an electric vehicle brushless motor controller based on a vector control concept. The electric vehicle brushless motor controller comprises an error detector, an SVPWM motor vector controller, a PI control unit, a weak magnetic angle sampling unit, a current sampling unit and a rotation speed sampling unit which form weak magnetic angle and current feedback inner closed-loop control and speed outer closed-loop control, wherein a current sampling element in the current sampling unit is a surveying brass wire, and the rotation speed sampling element is an HALL sensor. The electric vehicle brushless motor controller satisfies the wide speed regulation range performance of the whole vehicle under a normal condition, adopts an SVPWA technology in the vector control, ensures that an upper MOS tube and a lower MOS tube heat more evenly, and effectively prolongs the service life of the controller; and meanwhile, the invention has less motor impulse, higher operation efficiency, smaller current, lower noise, more comfortable driving feeling and low cost and is suitable for electric vehicles.

Description

technical field [0001] The invention relates to a brushless motor controller for an electric vehicle based on the concept of vector control. Background technique [0002] An important development trend of the electric vehicle industry is that the range of speed regulation is required to be wider and wider, and the torque and efficiency are required to be higher and higher. The brushless DC motor with square wave control method has a narrow speed range due to its theoretical limitations, and it is difficult to take into account speed, efficiency and torque; how to achieve a wide speed range of the motor and Large torque, this problem has been plagued by technicians in the electric vehicle industry. How to solve this contradiction, the industry has also carried out some useful explorations. There are roughly the following methods in the early stage: [0003] 1. From the perspective of the motor, the method of winding taps is adopted, and the external controller and relay cont...

AI Technical Summary

Problems solved by technology

The disadvantages are: the cost of the motor and external hardware increases, the system structure is complex, and the reliability is reduced

The disadvantages are: fast speed drop, little improvement in the actual speed-up range, and loud motor noise

[0012] Since the vector control system for industrial control needs to use two current transformers and a photoelectric encoder, which are used to sample the three-phase current and speed respectively, and are used for current and speed closed-loop control, the prices of current transformers and encoders are relatively It is too expensive for electric vehicles, and the cost is high, which is difficult for electric vehicle manufacturers to bear. At the same time, because the accuracy requirements of electric vehicle controllers are not too high (compared to industrial control), such as the vector control system for industrial control. Resources are a waste, not cost-effective

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