Ford Ranger EV. Electric Manual - part 6

LESSON 1: VEHICLE OVERVIEW

1-21

•

Alternating current is supplied from the TIM to the motor through

high voltage cables.

– Current flows through the stator windings generating a

magnetic field.

– The magnetic field causes the rotor to spin.

– Varying the amount of current controls torque.

– Varying the AC current frequency controls speed.

– During deceleration and braking, a negative torque is produced,

and the motor acts as a generator and regenerates charge in the

traction battery.

LESSON 1: VEHICLE OVERVIEW

1-22

Transaxle

Transaxle Components

•

The transaxle consists of a:

– two-stage direct reduction planetary gear system (similar to

other automatic transaxle planetary gear sets).

– 50/50 planetary differential.

•

The transaxle is a constant-ratio (one-speed) unit and uses no apply

components.

– There are no clutches, bands, or valves as in multiple-speed

transaxle units.

•

A cam-operated parking pawl is operated manually by the gear

selector assembly through the shift cable and shift lever.

•

The cam has five detent positions:

– Park (P)

– Reverse (R)

– Neutral (N)

– Drive (D)

– Economy (E)

LESSON 1: VEHICLE OVERVIEW

1-23

•

Direction (clockwise or counterclockwise) and speed of the motor

are monitored by a speed sensor mounted inside the transaxle case.

– The speed sensor detects passing teeth on the speed wheel as it

rotates.

– The speed wheel is mounted to the input shaft.

– The speed (rpm) signal is sent to the TIM.

•

The transaxle is lubricated by Tribolube-L6 (Pro Gear 21), a

synthetic, low-viscosity oil.

•

A 12-volt DC oil pump mounted inside the case supplies oil to

lubricate the gears and bearings.

– The pump is controlled by the TIM.

– Normal pressure is approximately 103 kPa (15 psi).

– If pressure drops below 28 kPa (4 psi), the oil pressure switch

opens and signals the TIM.

•

Motor/transaxle cooling is provided by the vehicle liquid cooling

system (covered later in this lesson).

NOTE: Adding transaxle oil is not a standard maintenance item.

Change transaxle oil at 3 year intervals.

LESSON 1: VEHICLE OVERVIEW

1-24

HIGH VOLTAGE POWER DISTRIBUTION BOX

High Voltage Power Distribution Box

•

The high voltage power distribution box (arrow) is located in the

underhood compartment on top of the battery charger.

•

The high voltage power distribution box is similar in function to

the fuse box in your home.

– It distributes high voltage to components and systems.

– It contains fuses.

•

The power distribution box directs fuse protected high voltage to:

– DC/DC converter.

– Heating system.

– Air conditioning system (optional).

– Power steering system.

– Battery charger.

•

The power distribution box has a protective cover that is part of the

high voltage interlock circuit (covered later in this lesson).

– When the cover is removed, a limit switch will open the relays

in the contactor box, which interrupts high voltage to the

vehicle systems.

HIGH VOLTAGE COMPONENT

ER016-A