Rotor overtemperature protection for electric motors

Details Rotor overtemperature protection for electric motors Rotor overtemperature protection for electric motors

1977-04-01

1978-09-12

Hohauser, Herman J.

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

H02P 104

Patent

active

041140770

ABSTRACT:
A system is provided for preventing overtemperature of the rotor bars of large squirrel-cage induction motors. A transmitter is mounted on the rotor and supplied with power from the rotor winding itself by a special current transformer. The transmitter is controlled by a temperature sensing element which causes it to transmit a signal in response to excessive temperature, and a slip frequency signal is also transmitted as a reliability check. A stationary receiver picks up the signal from the transmitter and includes circuitry for deenergizing the motor in response to the excessive temperature signal and for preventing energization of the motor if the slip frequency signal is not received.

REFERENCES:
patent: 3358208 (1967-12-01), Takami

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