Electric vehicle drive motor and control system - drive motor
The power of traditional cars comes from the engine, while electric vehicles use motor drive systems instead of engines as the power source. Fuel cell, hybrid, and pure electric vehicles all need motors to drive the wheels. Choosing the right motor is an important way to improve the cost performance of various electric vehicles. Therefore, it is essential to develop or improve drive motors that can meet various performance requirements during vehicle driving and have the characteristics of durability, low cost, and high efficiency. This is also an effective way to improve the cost performance of electric cars, popularize their application as soon as possible, and do a good job in energy conservation and emission reduction. The power performance of electric vehicles depends on the performance of their motor drive system.
Overview of drive motor
The electric motor drive system of electric vehicles is the main actuator in vehicle driving and an important component of electric vehicles. Its driving characteristics are the main performance indicators of vehicle driving. The function of the drive motor is to convert the electrical energy of the power supply into mechanical energy, and drive the wheels and working devices through the transmission device or directly. At present, DC series motors are widely used in electric vehicles. This type of motor has "soft" mechanical characteristics, which is very consistent with the driving characteristics of the car.
The electric vehicle motor speed control device is set for the speed change and direction change of electric vehicles. Its function is to control the voltage or current of the motor and complete the control of the motor's driving torque and rotation direction.
Operation mode of electric vehicle drive motor
The drive motor of an electric vehicle can operate as both a motor and a generator.
Electric mode
In electric mode, the drive motor converts electrical energy into mechanical energy.
1) The inverter obtains power from the battery, and the battery discharges.
2) The motor obtains electrical power from the inverter.
3) The motor outputs mechanical energy, and the motor torque is in the same direction as the speed, and the motor drives the vehicle.
Power Generation Mode
In power generation mode, the motor converts mechanical energy into electrical energy.
1) The vehicle drives the motor, the motor torque is opposite to the speed, and mechanical energy is input to the shaft.
2) The motor outputs electrical energy.
3) The inverter outputs DC power, and the battery is charged.
