Device and method for controlling switched reluctance motors for electric vehicles on basis of CPLD

Abstract

The invention discloses a device and a method for controlling switched reluctance motors for electric vehicles on basis of a CPLD (a programmable logic device). A hysteresis controller and a drive are connected in series with the CPLD device and then are connected between a current sensor and a power inverter; the output of the CPLD device is connected f/v conversion, v/f conversion and different input ends of the CPLD device connected with an encoder; a rotation-speed setting circuit is connected in series with a rotation-speed regulator and then is connected between the v/f conversion and the f/v conversion; a complementation circuit is connected between the rotation-speed regulator and a control-mode switch; the control-mode switch is connected with the inputs of the hysteresis controller and the drive; and a motor is connected with the input of the encoder. The device and the method can control the low-speed electrokinetic state, power-generation state and high-speed electrokinetic state of the electric vehicles respectively, meets control requirements in high-temperature, high-humidity, vibration dustiness and other severe working environment, have the advantages of reconfiguration property, no operation time delay, better real-time control and anti-interference capability, can simplify structure, raise operating speed, and control flexibility and reliability.

Description

technical field [0001] The invention relates to a pure hardware control technology of a switched reluctance motor for an electric vehicle, in particular to a pure hardware control method based on a complex programmable logic device (CPLD) combined with peripheral hardware circuits and a device thereof. Background technique [0002] Electric vehicles are environmentally friendly vehicles with zero emissions. When used on slopes, the following main requirements must be met: 1. The speed can be controlled conveniently; 2. It can generate large torque when going uphill; 3. It can Realize regenerative braking, convert mechanical energy into electrical energy and feed it back to the battery. [0003] At present, because the rotor of the switched reluctance motor (SR) has no windings and brushes, it has the advantages of low manufacturing cost, suitable for operation in a wide speed range, high power density, large starting torque, strong fault tolerance, stepless speed regulation ...

AI Technical Summary

Problems solved by technology

The flexibility and reliability of the switch reluctance motor control are reduced by using the controller composed of pure analog circuits in the past; the ordinary microcomputer control system adopts the combination of software and hardware, although the control performance of the switch reluctance motor is improved, but due to the control The controller must rely on software to work, it is difficult to adapt to the harsh working environment, and it runs slowly

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