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US 5,345,158 AGranted
Electrical distribution equipment with torque estimating capability
AssigneeGeneral Electric Company
InventorsGerald B. Kliman, Kamakshi Srinivasan, Rik W. DeDoncker, David E. Ritscher
Life of this patent
Estimating the term…
Abstract
A circuit breaker for protecting a motor-driven system from overcurrents and undervoltages includes both current and voltage sensors and derives a precise estimate of electromagnetic torque output from sensed currents and voltages. A contactor similarly includes torque estimating capability.
Claims21
A circuit breaker for use in a system driven by a motor, comprising:
- current sensing means for measuring current in each respective phase of the motor;
- voltage sensing means for measuring voltage across each respective phase of the motor;
- actuating means for controlling contacts operatively connected within each respective phase of the motor, said actuating means operating said contacts in response to indication of one of an overcurrent condition by the current sensing means and an undervoltage condition by the voltage sensing means, respectively;
- and
- computer means for receiving the measured current in each respective phase and the measured voltage across each respective phase from said current sensing means and said voltage sensing means, respectively, and for controlling said actuating means in response thereto, said computer means further comprising torque estimating means for estimating torque output of the motor from the measured current in each respective phase and the measured voltage across each respective phase.
2 more elements
A contactor for use in a system driven by a motor, comprising:
- current sensing means for measuring current in each respective phase of the motor;
- voltage sensing means for measuring voltage across each respective phase of the motor;
- actuating means for controlling contacts operatively connected within each respective phase of the motor, said actuating means operating said contacts in response to a control signal;
- and
- computer means for receiving the measured current in each respective phase and the measured voltage across each respective phase from said current sensing means and said voltage sensing means, respectively, and for controlling said actuating means in response thereto, said computer means further comprising torque estimating means for estimating torque output of the motor from the measured current in each respective phase and the measured voltage across each respective phase.
2 more elements
An electrical distribution system in a control center for a motor, comprising:
- current sensing means for measuring current in each respective phase of the motor;
- voltage sensing means for measuring voltage across each respective phase of the motor;
- actuating means for controlling contacts operatively connected within each respective phase of the motor, said actuating means operating said contacts in response to indication of one of an overcurrent condition by the current sensing means and an undervoltage condition by the voltage sensing means, respectively:
- computer means for controlling said actuating means in response thereto, said computer means further comprising torque estimating means for receiving the measured current in each respective phase and the measured voltage across each respective phase from said current sensing means and said voltage sensing means, respectively, and for estimating torque output of the motor therefrom;
- and
- means for coupling said torque estimating means to a communication means for remotely controlling a motor in response to the estimated torque output from said torque estimating means.
3 more elements
Dependencies are inferred from the claim text.