Motor speed control device is set to transform the shift and direction of the electric car, and its role is to control the motor voltage or current, complete control of the motor drive torque and rotational direction.
Before electric garbage tricycle three wheel motorcycle cars on DC motor speed using the series resistance or change the motor field coil turns to achieve. Because there is a level of speed and will produce additional energy consumption or use of a motor complex structure, it has been rarely used today. Today the electric vehicle broader thyristor chopper controlled by changing the uniform of the motor terminal voltage, electric garbage tricycle three wheel motorcycle current control to achieve variable speed motor. In the continuous development of power electronics technology, which is gradually replaced by other power transistor (the GTO, MOSFET, BTR and IGBT etc) chopper speeder is. From the technology point of view, along with the application of new drive motor speed control conversion of electric vehicles for the application to DC inverter technology will become an inevitable trend.
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