Motor control system with speed-change function and method thereof

Abstract

The invention relates to a motor control system with a speed-change function and a method thereof. The motor control system with the speed-change function comprises a state control module, a DC / DC boost conversion module, a motor phase current driving module, a phase current detection module and a power supply module, wherein the power supply module can adopt a battery for providing low voltage, when the rotational speed of a motor is increased to a certain degree, the DC / DC boost conversion module is used for boosting input voltage, and the state control module uses the phase angle advanced phase change technique to maintain that proper torque is still output when the motor power system of an electric two-wheel vehicle rotates at a high speed, and under a proper plan, traditional application occasions requiring for a mechanical speed control system can be replaced, so as to achieve the purposes of simplifying the system and saving cost.

Description

technical field [0001] The present invention proposes a motor control system with variable speed function and its method, especially for low speed and high torque output and its maximum speed is limited by the battery voltage, which is difficult for the motor power system of the current electric two-wheeled vehicle to take into account. High torque, motor controller technology with proper torque output when maintaining high speed, especially suitable for applications where it is difficult to obtain high power supply voltage, such as electric two-wheeled vehicles. Background technique [0002] The current brushed DC motors and brushless DC motors have been widely used in many industrial applications and drive systems of electric two-wheel vehicles because of their torque and speed control characteristics. However, for electric two-wheel vehicles or For other applications that need to use batteries as power supply, the power supply voltage has been determined by the number of ...

AI Technical Summary

Problems solved by technology

[0010] The loss is the square times of the phase current of the motor, which seriously affects its efficiency, causes a large temperature rise of the motor, and even affects the life of the motor. Therefore, for the application of electric two-wheeled vehicles, it must have the characteristics of high torque and high speed at the same time. Unless a mechanical transmission system is used to obtain a wide range of torque and speed, this means that considerable cost and space are required to add a mechanical transmission system; if a higher speed is to be achieved, more battery packs must be connected in series, and PWM The commutation control circuit 3 must be able to control the motor phase current drive circuit 4 to provide a considerable current to the motor winding to generate sufficient torque output

However, the more batteries in series, the higher the management complexity of the battery system, and under the operating conditions of low speed and high current, higher battery voltage will also lead to greater switching loss;

[0011] Therefore, if you want to meet the requirements of high torque output at low speed and the highest speed at the same time, you need to use a larger-sized motor, or you must use a mechanical transmission system, which will inevitably increase the weight and volume, and of course you must pay additional costs.

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