Component Parts

COMPONENT PARTS

Traction Motor Inverter

NOTE:
Control of the traction motor and control of HEV system CAN communications with other control modules is actually performed by the motor controller. However because the motor controller is installed inside the traction motor inverter, the motor controller is here referred to as the traction motor inverter.
- The traction motor inverter is composed of the motor controller, driver, smoothing condenser, current sensors, coolant temperature sensor, and power module.
- The traction motor inverter controls the traction motor based on the drive command signal transmitted by
HEV system CAN from the HPCM.
- Traction motor inverter drives traction motor accurately based on resolver detection signal and current sensor detection signal.
- The traction motor inverter performs charging judgment for the high voltage circuit and also discharges the voltage inside the circuit.
- Traction motor inverter operates speed control according to command from HPCM. This control absorbs instantaneously the speed difference between engine and transmission, and it allows driving with reduced shift shocks
- The traction motor inverter performs vibration control in order to improve accelerator response and provide good acceleration while driving.

MOTOR CONTROLLER

The motor controller receives the rotor rotation angle from the traction motor resolver and the traction motor current value from the current sensor, and creates the pulse signal for driving the IGBT.

DRIVER

The driver converts the pulse signal (12V) from the motor controller to a high voltage signal (300V) and drives the IGBT.

POWER MODULE

- The power module is composed of 6 power semiconductor IGBT (Insulated Gate Bipolar Transistor).
- An IGBT Is a semiconductor switch that is capable of switching ON/OFF at high speed.
- An IGBT uses the IGBT drive signal from the driver to perform switching, converting the Li-ion battery DC
power to AC power and supplying AC power to the traction motor.

SMOOTHING CONDENSER

- Smoothing condenser charges DC power from Li-ion battery.
- The smoothing condenser controls the voltage ripple which occurs as a result of IGBT switching.

CURRENT SENSORS

For U-phase and V-phase, 2 sensors each are allocated. Current sensor detects current supplied to traction motor and transmits current value feedback to motor controller. W-phase current is calculated from U-phase and V-phase values.

COOLANT TEMPERATURE SENSOR

Coolant temperature sensor detects coolant temperature in traction motor inverter.

DISCHARGE RESISTER

The discharge resistor discharges the high voltage in case the traction motor inverter is unable to discharge the remaining high voltage in the high voltage circuit due to a malfunction.