ELECTRIC MOTOR
id301000200300
Purpose
• While driving, the electrical energy of the high voltage battery is converted to kinetic energy to generate drive force. In addition, during deceleration, the vehicle’s kinetic energy is converted to electrical energy to charge the high voltage battery.
Functions
• The electric motor has 2 functions.
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― Converts the electrical power from the inverter to drive force.
― By regenerating the vehicle’s kinetic energy via the drive wheels, it is converted to electrical energy and suppled to the inverter.
Specification
• Maximum output: 107 kW
• Maximum torque: 270 Nm
Construction
• The motor and the EV transaxle are connected by the spline construction of the rotor shaft.
• The structure inside the electric motor case is as follows.
Part name
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Reference
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Stater component
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Rotor component
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Electric motor speed sensor
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• The inverter is installed at the top of the electric motor case. The inverter and the high voltage terminal of the stator coil of each electric motor phase are connected using bus bars.
• The motor generates heat by the electrical current of the stator coil.For this reason, water jackets are installed inside the motor case to cool the motor by circulating coolant.
Operation
During driving
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• By switching the power transistors on/off, alternating current is sent to the electric motor stator coils.
• By switching the input of the 6 power transistors to the electric motor, the magnetic force direction of the coil of each phase is switched and a rotating magnetic field is generated in the electric motor.
• The rotor component rotates as the rotor magnets attract/repel according to the direction of the rotating magnetic field.
During regenerative braking
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• During deceleration, the drive force is transmitted from the drive wheels and the rotor component rotates, which generates electromotive force in the stator coil.
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• The electromotive force of the motor is input to the inverter and it is converted to direct current power by three-phase full wave rectification.
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• The high voltage battery is charged by inputting the direct current power to the high voltage battery.