The role of the drive motor is to convert the electrical energy of the power supply into mechanical energy, and to drive the wheels and working devices directly through the transmission. At present, DC series electric motors are widely used in electric vehicles. Such motors have "soft" mechanical characteristics and are in good agreement with the driving characteristics of automobiles. However, due to the presence of commutating sparks, DC motors have low power, low efficiency, and high maintenance workload; along with the development of motor control technology, they are bound to be gradually brushless DC motors (BLDCM), switched reluctance motors (SRM) and AC asynchronous Replaced by a motor, such as a non-sheathed disk type axial magnetic field DC series motor.
The motor speed control device is set for the speed change 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 drive torque and the rotation direction of the motor.
In the early electric vehicles, the speed regulation of the DC motor was achieved by using series resistors or changing the number of turns of the motor magnetic field coil. Because its speed regulation is graded, and it will produce additional energy consumption or use a complex motor structure, it is rarely used. Thyristor chopper speed regulation is widely used to achieve stepless speed regulation of the motor by uniformly changing the motor terminal voltage and controlling the motor current. In the continuous development of electronic power technology, it is gradually replaced by other power transistors (into the GTO, MOSFET, BTR and IGBT, etc.) chopper speed control device. From the point of view of the development of technology, with the application of new drive motors, the application of the new type of electric motor, the speed control of electric vehicles to the application of DC inverter technology will become an inevitable trend.
Compared with internal-combustion engine vehicles, electric vehicles have a simple structure, and have fewer parts for operation and transmission, and have a small maintenance workload. When using an AC induction motor, the motor does not require maintenance, and more importantly, the electric vehicle is easy to operate.
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