Brushless electric machine contrller for electric vehicle

Abstract

A brushless motor controller on electric motor car is composed of control circuit board box and fixed connection integrated port set on the box. The said control circuit board is formed by processing circuit of speed adjustment value, processing circuit of cruise value, processing circuit of brake signal, central processor, Hall decoding and processing logic gate circuit, power tube driving circuit, power tube output circuit, brake lamp driving circuit and horn driving circuit.

Description

technical field [0001] The invention relates to a brushless motor controller for electric vehicles, belonging to the technical field of control of brushless motors for electric vehicles. Background technique [0002] The existing brushless motor controllers for electric vehicles only have a handle starting circuit, a cruise circuit with a fixed handle opening value, and the like. Its working process is that the decoding circuit decodes the three-way Hall signal, and directly drives the three-way upper and lower bridge arms through the AND gate and the signal (analog voltage) from the handle according to the truth table. Some controllers generally also contain over-discharge and hardware over-current protection circuits. Due to the defects in structure and circuit design, there are mainly the following problems: [0003] 1. Its cruise function is to lock the analog voltage value from the handle, which means that when the road conditions change, such ...

AI Technical Summary

Problems solved by technology

[0003] 1. Its cruise function is to lock the analog voltage value from the handle, which means that when the road conditions change, such as uphill or downhill, the controller cannot adjust itself according to the change of the road surface, so the user must release the cruise state and enter the handle control

This increases the number of high-current starts and brakes of the battery. The former will shorten the service life of the battery, and the latter will accelerate the wear of the mechanical brake device, which will bring hidden dangers to safety.

[0004] 2. Adopt a special industrial brushless motor control circuit, because there is no current compensation during the acceleration process (current compensation is performed during commutation), and the brushless motor has its inherent low-speed pulsation phenomenon, so it will appear during the startup acceleration process. The phenomenon of vehicle jitter, strong noise pollutes the environment, and also loses the driving pleasure for customers. At the same time, due to the many plastic parts of electric bicycles, it is easy to cause damage to the structure of the vehicle

[0005] 3. The ordinary electric bicycle controller transformed from an industrial brushless motor control circuit, although part of the control circuit has a braking function, but because the opening ratio cannot be adjusted, the general professional control circuit is 100% fully open, so its system Motor functions are basically unavailable for e-bikes

Because the braking force is too large, it will also bring hidden dangers to the safety of users driving at high speed.

[0006] 4. It only has pure hardware overcurrent protection function, that is, it is compared by a comparator. When the sampling current is too large, the level of the comparator is reversed, and the enable terminal of the special brushless motor control chip is turned off, so as to turn off the PWM output. This will cause the vehicle to vibrate violently when the vehicle is over-current

Because once the PWM is turned off, the sampling current drops to zero immediately, and the overcurrent protection is released at this time, the motor will rotate rapidly, and then the overcurrent is detected, and the controller protects again, so there will be severe "shaking" phenomenon

[0007] 5. The ordinary electric bicycle controller transformed from an industrial brushless motor control circuit does not have its own anti-theft function. The wiring inside the bicycle becomes complicated, burying the hidden danger of failure

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