Page 15 - i-MeIV Product Information

EV System

2-3-3 DC->AC Inverter :Structure
Inverter transforms DC 330V at battery pack to AC 330V for the motor by PWM [Pulse Width Modulation] .
To carryout the pulse Width modulation, IGBT [Insulated Gate Bipolar Transistor ] is employed.
In order to rotate the motor, the inverter apply the power voltage to the stator coils at appropriate timing according to
the rotor position signal from the resolver.
The inverter could control the motor torque by changing the amount current flow, and could control the rev. speed by
changing Frequency of the pulse.

Motor
Inverter
Battery pack IGBT U Stator coil
Rotor

Battery
Pack N S

[Li-ion]
V
W

Control circuit

Smoothing condenser

IGBT
Insulated Gate Bipolar Transistor

Printed circuit board Heat sink

[Note]: ：IGBT: Insulated Gate Bipolar Transistor
IGBT could operate under ultra high-speed for the switching function

2-3-4 DC->AC Inverter :Control
Inverter controls the voltage and current, when the motor is under driving and/or regeneration.
[For Driving]
Inverter transform DC 330V at battery pack to AC 330V for the motor , and generates rotating magnetic flux by
stator coil.
Motor rotates by the rotating magnetic flux which is controlled by the inverter.

[For Regeneration]
By control the current phase, Inverter could make deceleration
torque. Battery pack
At this stage, motor could be act as alternator and generates
electrical current flow.

It is called as regeneration and the re-generated current is Drive Inverter Regeneration
introduced to the battery pack for charging.

Motor

１３