Over heat protection circuit for a brushless dc motor

Details Over heat protection circuit for a brushless dc motor Over heat protection circuit for a brushless dc motor

2006-06-20

2006-06-20

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

Reexamination Certificate

active

07064940

ABSTRACT:
A over heat protection circuit for a brushless dc motor includes a thermal sensitive resistor, a resistor and a transistor. The thermal sensitive resistor and the resistor are commonly connected to a base of the transistor while an emitter of the transistor connecting to a motor coil. The thermal sensitive resistor has a resistance value which can be changed in response to an operational temperature. The thermal sensitive resistor is preset to operate at a safety temperature within a predetermined thermal preference. When the operational temperature of the motor coil exceeds the safety temperature, the over heat protection circuit may to cut off a motor current so that the motor coil is protected.

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patent: 2004/0051622 (2004-03-01), Banich et al.

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