ELECTRIC DRIVE SYSTEM CONTROL

id301000200600

Drive Motor Control Module

Outline

• The drive motor control module monitors and detects the conditions of the inverter and the electric motor from the information sent from each sensor installed to the inverter and the electric motor and sends the condition information to each module via CAN communication.

• The drive motor control module outputs control signals to the power transistors in the inverter based on the conditions of the inverter and the electric motor received from the PCM via CAN communications.

• The following sensor information is input to the drive motor control module.

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Part name

Content

Electric motor speed sensor

Detects the motor rotation angle and rotation direction. (See Electric Motor Speed Sensor.)

Electric motor temperature sensor

Detects the electric motor temperature and inputs signals which vary according to the electric motor temperature to the drive motor control module.

Electric motor current sensor

Detects electrical current in the U phase, V phase, and W phase in the electric motor and inputs the information to the drive motor control module.

Input voltage sensor

Detects the voltage to be input to the inverter from the high voltage battery and inputs the information to the drive motor control module.

Power transistor temperature sensor

Detects the power transistor temperatures at the U phase, V phase, and W phase in the inverter and inputs the information to the driver motor control module.

Part name	Content
Electric motor speed sensor	Detects the motor rotation angle and rotation direction. (See Electric Motor Speed Sensor.)
Electric motor temperature sensor	Detects the electric motor temperature and inputs signals which vary according to the electric motor temperature to the drive motor control module.
Electric motor current sensor	Detects electrical current in the U phase, V phase, and W phase in the electric motor and inputs the information to the drive motor control module.
Input voltage sensor	Detects the voltage to be input to the inverter from the high voltage battery and inputs the information to the drive motor control module.
Power transistor temperature sensor	Detects the power transistor temperatures at the U phase, V phase, and W phase in the inverter and inputs the information to the driver motor control module.

Construction

• The drive motor control module is located inside the inverter.

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System wiring diagram

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Electric Motor Speed Sensor

Purpose, Function

• The motor rotation speed sensor detects the motor rotation angle and rotation direction as the basic information for controlling the three-phase alternating current power which drives the motor.

• The output signal of the sensor is input to the drive motor control module. The drive motor control module sends the input signal as a motor rotation angle signal to the PCM via CAN communication.

• The motor rotation speed sensor is installed to the rotor shaft bearing.

Construction

• The motor rotation speed sensor is installed to the rotor shaft bearing.

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• The motor rotation speed sensor has the following built-in coils.

― Energizing coil

― Output coil Sin

― Output coil Cos

• The locations of the output coil Sin and output coil Cos are shifted by 90 degrees electrically.

• The motor rotation speed sensor rotor is installed to the same axis as the rotor component of the motor.

Operation

• Constant alternating current flows to the energizing coil. The output coil Cos and output coil Sin generate excitation current with the same frequency as the energizing current by electromagnetic induction.

• When the electric motor rotates, the gap between the output coil and the electric motor speed sensor rotor changes due to the concavity and convexity of the rotor surface. As a result, the magnetic flux of the output coils changes and strength differences occur to the peak voltage in the output coils.

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• The drive motor control module joins the peak voltage of the output coils and converts it to a virtual waveform. The rotor position, rotation direction, and rotation speed are calculated based on this waveform.

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