eMotor Description and Function

WARNING: Electricity hazard
Failure to follow specified procedures will result in death or serious injury from electric shock when working on or near high-voltage components.

Only authorized and appropriately trained persons may carry out work on high-voltage vehicles and components
Perform high voltage isolation procedure prior to commencing work
Ensure appropriate personal protective equipment is worn until the system is verified safe
Never touch, cut, or disconnect any orange HV cables or connectors, or any of the HV components without first disabling the system
When working on or near the HV system, always assume the HV battery and components are charged/energized until it is proven that they have been discharged and made safe
The HV battery is not internally serviceable. Once the battery has been removed, no attempt should ever be made to open it

Technical Description:

The VinFast VF9 is a fully electric vehicle. The vehicle has 2 liquid-cooled HV motors, one on the front and one on the rear axle, by means of which AWD is realized. The motors are operated at a voltage of about 400 V and develop a power of 150 KW and a torque of 150 Nm. The electric motor is a permanent magnet synchronous motor. Synchronous motors are AC motors in which, at steady state, the rotation of the shaft is synchronized with the frequency of the supply current (AC). The front and rear Electrical Drive System (EDS) are mainly assembled using identical parts, the main difference being that there is no parking lock actuator on the rear axle. The control system, which is also liquid-cooled, is designed as a 3-in-1 component and includes a DC-DC converter, OBC and PDU.

NOTE: Internal faults of the electric motor will require the motor to be replaced.

Courtesy of VINFAST, LLC

EDS Electrical Drive System (front):

Fig 1: EDS Electrical Drive System (Front) Components Location

Courtesy of VINFAST, LLC

EDS Electrical Drive System (rear):

Fig 2: EDS Electrical Drive System (Rear) Components Location

Courtesy of VINFAST, LLC

Overview of EDS components:

Fig 3: EDS Electrical Drive System Components Location

Courtesy of VINFAST, LLC

Inverter module:

Fig 4: Inverter Module Components Location

Courtesy of VINFAST, LLC

The inverter module (1) is located at the outer stator housing.
The electric controller receives direct current from the HV battery via the HV cable and the 3-in-1 (PDU, OBC, DCDC).
Direct current is transformed into three phases alternating current and supplied to the electric motor via an integrated wiring connection.
The electric controller is connected to the vehicle's electrical network via the low voltage connector at the front.
The electric controller is equipped with a coolant inlet for the EDS unit.
The coolant runs through the controller's cooling channels before being supplied to the electric motor's housing.

EDS Function - Transmission

Courtesy of VINFAST, LLC

The differential/reduction gear set (shown in blue color) provides the fixed forward and reverse ratio. Changing speed and torque is fully automatic.

PARK (P):

This position locks the wheels and prevents the vehicle from rolling either forward or backward. PARK is the best position to use when starting the vehicle's drive system.

REVERSE (R):

This position allows the vehicle to be driven backwards by reversing the rotation of the electric motor.

NEUTRAL (N):

This position allows the vehicle to be moved without powering up the electric motor and without the Park PAWL engaged.

DRIVE (D):

This position allows the vehicle to be operated in a forward direction by electrically varying the output torque and speed of the electric motor.