Linde T20 SP - AC Control Module Operating Principle

Service Training
Section 6
Page 6
6.1.3 A.C. control  Operating principle
6.1.3.1 Traction and hydraulic power module - 1A1
For an asynchronous motor with typical three-phase current, the conducting path in the three windings is
controlled by a bridge of six MOSFETS. By controlling when each of the six MOSFETS is activated or
deactivated, it is possible to control in one direction then in the other, the current in each of the three motor
windings (phases).
MOTOR WINDING (PHASE)  ONE
MOTOR WINDING (PHASE)  TWO
MOTOR WINDING (PHASE)  THREE
First active
pair of
MOSFETS
Second
active pair
of
MOSFETS
First active
pair of
MOSFETS
Second
active pair
of
MOSFETS
First active
pair of
MOSFETS
Second
active pair
of
MOSFETS
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