Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1996-09-25
1998-10-20
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
318806, 318811, H02H 504
Patent
active
058255974
ABSTRACT:
A system for controlling circulating currents in a motor. A power supply link having upper and lower rails supplied by a power supply provides power to the motor windings. The power supply link also has power switches responsive to a motor control signal for selectively connecting the rails to the windings in alternating on and off intervals. The system includes a first resistive shunt in the upper rail of the power supply link between the power supply and the power switches and a second resistive shunt in the lower rail of the power supply link between the power supply and the power switches. The power supply link routes current circulating in the power supply link and windings through either the first or second resistive shunt for continuously sensing current in the rails. The system also includes a current regulation circuit which generates an overcurrent signal as a function of the current sensed in either the first or second resistive shunt exceeding a maximum current level. A control circuit responsive to the overcurrent signal causes each of the power switches to become nonconducting thereby to prevent excessive current from circulating in the motor.
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Thomas M. Jahns et al., "Integrated Current Regulation for a Brushless ECM Drive," Jan. 1991, IEEE Transactions On Power Electronics, vol. 6, No. 1, pp. 118-126.
Gaffin Jeffrey A.
General Electric Company
Mora Enrique J.
Sherry Michael
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