Current limiting value adjustment device and method for brushless direct current motor for driving electric motor car

Abstract

The invention discloses a current limiting value adjustment device and method for a brushless direct current motor for driving an electric motor car. The device is formed by sequentially connecting a controller, a resistance adjusting circuit, a voltage division circuit, a comparison circuit and three signal input ends, wherein the resistance adjusting circuit comprises two resistors R1 and R2 and a switch tube; the other end of the resistor R1 is connected with an output end of the controller; an input end of the controller is connected with the first signal input end; the other end of the resistor R2 is connected with the second signal input end; the voltage division circuit is formed by connecting a resistor R3 and a resistor R4 in series; the other end of the resistor R3 is connected with the second signal input end; the other end of the resistor R4 is grounded; the comparison circuit comprises a comparator; and two comparison signals of the comparator are voltages at two ends of the resistor R4 and a reference voltage U<c> input by the third signal input end respectively. The adjustment method for the device can adjust a current limiting value of the brushless direct current motor in real time according to the rotating speed of the brushless direct current motor.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle motor control, and in particular relates to a device and method for adjusting the current limiting value of a brushless DC motor for driving an electric vehicle. Background technique [0002] In recent years, urban traffic problems have attracted increasing attention. Although automobiles, motorcycles, etc. have been gradually popularized in the world because of their convenience and other advantages as means of transportation, with the continuous increase in the number of urban automobiles and motorcycles, the problem of environmental pollution And energy problems are also getting worse. With the continuous advancement of new high-energy secondary battery technology, especially lithium-ion power battery technology, the technology development, promotion and application of electric motorcycles, electric bicycles, electric scooters, and electric recreational vehicles has received increasing...

AI Technical Summary

Problems solved by technology

However, most of the existing current limiting methods adopt a fixed current limiting value design, and it is impossible to adjust the real-time current limiting value according to the electric vehicle motor speed.

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