best hybrid cars

Speed ??control
The motor speed control device is provided for shifting and direction change of the electric vehicle, and its function is to control the voltage or current of the motor to complete the control of the driving torque and the rotation direction of the motor.
In the early electric vehicles, the speed regulation of the DC motor was achieved by using a series resistor or changing the number of turns of the motor field coil. Because the speed regulation is stepped, and the additional energy consumption or the structure of the motor is complicated, it is rarely used. The widely used thyristor chopper speed regulation realizes the stepless speed regulation of the motor by uniformly changing the terminal voltage of the motor and controlling the current of the motor. In the continuous development of electronic power technology, it has gradually been replaced by other power transistors (such as GTO, MOSFET, BTR and IGBT). From the perspective of technological development, with the application of new drive motors, the application of electric vehicle speed control to DC inverter technology will become an inevitable trend.
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