Nissan Leaf. Manual - part 1183

COMPONENT PARTS

TMS-13

< SYSTEM DESCRIPTION >

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TMS

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Traction Motor Inverter

INFOID:0000000010120896

NOTE:

Control of the traction motor and control of EV system CAN communications with other control modules is

actually performed by the motor controller. However, because the motor controller is installed inside the trac-

tion 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, 2 current sen-

sors, and power module.

• The traction motor inverter controls the traction motor based on the target motor torque signal transmitted by

EV system CAN from the VCM.

• Traction motor inverter drives traction motor accurately based on resolver detection signal and current sen-

sor detection signal.

• The traction motor inverter performs charging judgment for the high voltage circuit and also discharges the

voltage inside the circuit.

• 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 (Insulated Gate Bipo-

lar Transistor).

• The motor controller detects the traction motor temperature by means of the traction motor temperature sen-

sor, and limits the output torque (protection control) according to the level of heat in the traction motor.

DRIVER

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

the IGBT.

POWER MODULE

• The power module is composed of 6 power semiconductor IGBTs.

• 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

The smoothing condenser controls the voltage ripple which occurs as a result of IGBT switching.

CURRENT SENSOR

Current sensors are located in Phase U and V, respectively. These sensors detect a current supplied to the

drive motor and feed back a current value to the motor controller. The current sensors have two built-in sen-

sors.

A current of Phase W is calculated according to the values of Phase U and V.

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.

Traction Motor

INFOID:0000000010120897

• The traction motor contains an “Interior Permanent Magnet Synchronous Motor (IPMSM)”. A permanent

magnet is embedded inside the rotor core, and the rotating magnetic field generated by the stator coil is

used to generate rotational torque.

Traction motor inverter

TMS-13, "Traction Motor Inverter"

Traction motor

TMS-13, "Traction Motor"

No.

Item

Function

TMS-14

< SYSTEM DESCRIPTION >

COMPONENT PARTS

• The traction motor is able to generate torque even when the vehi-

cle is stopped, and outputs maximum drive torque when the vehi-

cle starts moving in order to provide good initial acceleration.

TRACTION MOTOR RESOLVER

The traction motor resolver is located coaxially with the traction motor, and detects the rotor rotation angle.

The rotation angle is sent to the motor controller.

CAUTION:

If the traction motor inverter or traction motor is replaced, be sure to perform writing of the traction

motor resolver offset. Refer to 

TMS-39, "Description"

.

TRACTION MOTOR TEMPERATURE SENSOR

The traction motor temperature sensor detects the temperature of the stator inside the traction motor, and

sends that temperature information to the motor controller.

High Voltage Warning Label

INFOID:0000000010120898

When replacing component parts make sure to affix the label in the original position.
The label   is affixed to the right side of traction motor.

JPCIA0033GB

: Vehicle front

: Direction of the label

JSCIA0665ZZ

STRUCTURE AND OPERATION

TMS-15

< SYSTEM DESCRIPTION >

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STRUCTURE AND OPERATION

Structural Drawing

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MOTOR MECHANISM (DIAGRAM)

Operation Description

INFOID:0000000010120900

OPERATION PRINCIPLE

• When 3-phase AC current is applied to the stator coil, a rotating magnetic field is generated. This rotating

magnetic field pulls on the permanent magnet inside the rotor core, generating rotational torque that is syn-

Stator core

Coil

Shaft

Rotor core

Permanent magnet

JPCIA0072ZZ

JPCIA0034GB

TMS-16

< SYSTEM DESCRIPTION >

STRUCTURE AND OPERATION

chronized with the rotating magnetic field. The generated torque is approximately proportional to the current,

and the rotating speed depends on the frequency of the 3-phase current.

• In order to generate optimal rotor rotation, judgments regarding the position (angle) of the permanent mag-

net within the rotor core and the timing of current application to the coil are necessary.  For this purpose, the

traction motor resolver and current sensor are used in order to continually detect the rotating position of the

rotor and control the timing of current application to the coil.