Motor drive apparatus and method and electrically driven...

Details Motor drive apparatus and method and electrically driven... Motor drive apparatus and method and electrically driven...

2007-01-18

2008-08-19

Arani, Taghi T. (Department: 4193)

Electricity: motive power systems

Braking

Dynamic braking

C318S362000, C318S400010, C318S700000

Reexamination Certificate

active

07414376

ABSTRACT:
In such a product that torque of a motor is continuously generated when a rotation number of the motor is nearly equal to zero, since an output voltage is kept at a constant value in accordance with a rotation position of the motor, such a condition that currents are concentrated in a specific element are maintained. As a result, a temperature of the specific element is increased, so that there are problems that a temperature fail of an inverter apparatus may readily occur, and thus, lifetimes of elements are lowered. In a power converter of a motor drive apparatus, windings are energizing-controlled in such a manner that only 1 phase of a switching circuit is pulse-width-controlled when the motor is under motor locking condition.

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