Motors: expansible chamber type – With signal – indicator or inspection means
Patent
1978-11-02
1980-11-25
Broome, Harold
Motors: expansible chamber type
With signal, indicator or inspection means
91363A, 310 14, F01B 2526, F01B 3112, F15B 903, F15B 909
Patent
active
042351537
ABSTRACT:
An electromagnetic motor is provided with a samarium cobalt permanent magnet comprising a plurality of radially abutting segments. A combination of linear and non-linear springs with a force gradient larger than the magnetic force gradient facilitate motor operation in proportion to currents in electrical coils positioned on each side of the permanent magnet. Servoamplifiers independently control the current in each electrical coil in response to an input command signal, a motor position feedback signal and an actuator position feedback signal. A failure detection circuit detects coil failure by comparing current in each coil on one side of the magnet with the current in a corresponding coil on the opposite side of the permanent magnet. The circuit produces output signals to disconnect a defective coil and initiate an alarm. The circuit also detects power supply and motor position transducer failures by comparing their respective output voltage signals against predetermined reference voltages. The servoamplifiers and electrical coils are provided in a redundant arrangement and designed with sufficient current capacity to continue motor operation despite a coil failure.
REFERENCES:
patent: 2826896 (1958-03-01), Glaze et al.
patent: 3460081 (1969-08-01), Tillman
patent: 3585902 (1971-06-01), Anderson
patent: 3755699 (1973-08-01), Cartwright
patent: 4144514 (1979-03-01), Rinde et al.
Perry Richard M.
Rinde John E.
Bahr Arthur E.
Broome Harold
Feedman Irving M.
General Electric Company
Savage Ralph M.
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