Motor drive apparatus equipped with dynamic braking circuit...

Details Motor drive apparatus equipped with dynamic braking circuit... Motor drive apparatus equipped with dynamic braking circuit...

2008-11-28

2011-11-08

Benson, Walter (Department: 2837)

Electricity: motive power systems

Braking

Dynamic braking

C318S372000, C318S375000

Reexamination Certificate

active

08054015

ABSTRACT:
A motor drive includes a dynamic braking circuit for producing a deceleration torque utilizing a braking force caused by a synchronous motor acting as a generator when the synchronous motor is deenergized. The motor drive apparatus is equipped with a dynamic braking circuit fault detection capability, a DC power supply which is obtained by rectifying input AC power, voltage application function for applying a voltage to the windings of the synchronous motor and to the dynamic braking circuit for a predetermined length of time by switching power transistors connected to the DC power supply, current detection unit for detecting the value of a current flowing from the power transistors, and fault checking unit for checking the dynamic braking circuit for the presence or absence of a fault, based on the current value detected by the current detection unit and on a predefined threshold value.

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patent: 2004/0160208 (2004-08-01), Youm et al.
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patent: 2007/0291426 (2007-12-01), Kasunich et al.
patent: 7322663 (1995-12-01), None
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patent: 2000253687 (2000-09-01), None
patent: 2003009560 (2003-01-01), None
Machine translation of JP08033195A.
Notice of Reasons for Rejection for JP2008-001916 mailed Feb. 17, 2009.

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