Tion - Mitsubishi PBV20N2 Service Manual

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PBV20N2

6.5

Traction

The movement of the truck is controlled by the traction controller. Before the truck can

The movement of the truck is

be driven, the battery must be connected, the main key switch must be closed and the

be driven, the battery must be

system must have passed the self-test procedure.

system must have

passed the self-test procedure.

When the truck is

When the truck is powered on and in the standby mode, it can

powered on and in the standby mode, it can be driven by turning the

accelerator at the end of the

accelerator at the end of the tiller arm forward or

diagram, the accelerator is presented in zones 12 to 15 on page 3 of the

diagram, the accelerator is presented in zones 12 to 15

schematic diagram. The accelerator unit receives its

schematic diagram. The accelerato

from the pin 2 of the connector XA1C. The negative connection is supplied directly from

- B. When the accelerator is turned forward or backward, it

- B.

When the accelerator is turned forward or backward, it indicates the direction to the

traction controller via the pins 4

traction controller via the pins 4 and 8 of the

voltage to the pin 4 of the connector XA1C. The voltage varies between 0, 3

voltage to the pin 4

of the connector XA1C. The voltage varies between 0, 3 and 4.7

volts, depending on the position of the accelerator control. The voltage increases as the

accelerator is moved to either extreme.

6.6

AC motor operation

In the induction motor (= asynchrono

In the induction motor (=

current and designed to create a rotating magnetic field, which rotates in

current and designed to create a rotating magnetic field, which rotates in time with the

AC oscillations. In the induction

AC oscillations. In

the induction motor, the roto

stator field and therefore the magnetic field through the rotor is

stator field and therefore the magnetic field through the rotor is changing (rotating). The

rotor has windings in the form

rotor has windings in the form of closed wire loops. The rotating magnetic flux induces

currents in the rotor windings as

currents in the rotor windings as in a transformer. These currents in turn

magnetic fields in the rotor that

magnetic fields in the rotor that interact with the stator field. Due

direction of the created magnetic field is such

direction of the created magnetic field is such as to oppose the change in current

through the windings. The cause of induced current in the rotor is the rotating stator

through the windings. The cause of induced current in the rotor

magnetic field, so to oppose it, this rotor starts to rotate in the direction of the rotating

stator magnetic field to make the relative speed between the rotor and the rotating

stator magnetic field to make the relative speed between the rotor

stator magnetic field zero.

For these currents to be induced, the speed of the physical rotor must

For these currents to be

induced, the speed of the physical rotor must be lower than

that of the stator's rotating magnetic field or the magnetic field would not be moving

that of the stator's

rotating magnetic field or the magnetic field would not be moving

relative to the rotor

relative to the rotor conductors and no currents would be induced. As the speed of the

conductors and no currents would be induced. As the speed of the

rotor drops below synchronous speed, the rotation rate of the magnetic field in the rotor

rotor drops below synchronous speed, the rotation rate of the magnetic field in

increases, inducing more current in the windings and creating more torque. The ratio

between the rotation rate of the magnetic field as

between the rotation rate of the magnetic field as seen by the rotor (s

rotation rate of the stator's r

rotation rate of the stator's rotating field is called "slip". Under load, the

the slip increases enough to create sufficient torque to turn

the slip increases enough to create sufficient torque to turn the load. For this reason,

induction motors are sometimes referred to

induction motors are sometimes referred to as asynchronous motors. An

motor can be used as

motor can be used as an induction generato

an induction generator, or

induction motor, which can directly

induction motor, which can directly generate linear motion.

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Revision: B

controlled by the traction controller. Before the truck can

connected, the main key switch must be closed and the

tiller arm forward or backward. In the electrical schematic

backward. In the electrical schematic

r unit receives its positive 24 volt electrical supply

and 8 of the connector XA1B. It also provides a varying

connector XA1B. It also provides a varying

asynchronous motor), the stator

us motor), the stator is powered with alternating

motor, the rotor rotates at a slowe

r rotates at a slower speed than t

of closed wire loops. The rotating magnetic flux induces

in a transformer. These currents in turn create

interact with the stator field. Due to Lenz's law, the

as to oppose the change in current

seen by the rotor (slip speed) and the

otating field is called "slip". Under load, the speed drops and

as asynchronous motors. An induction

r, or it can be unrolled to form

it can be unrolled to form the linear

generate linear motion.

Document ID: 615023

Service Manual

Service

Manual

be driven by turning the

on page 3 of the electrical

electrical

positive 24 volt electrical supply

indicates the direction to the

and 4.7

is powered with alternating

time with the

r speed than the

changing (rotating). The

create

to Lenz's law, the

is the rotating stator

and the rotating

be lower than

lip speed) and the

speed drops and

the load. For this reason,

induction

the linear

the rotor

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