Electricity: motive power systems – Synchronous motor systems – Field winding circuits
Reexamination Certificate
2005-11-01
2005-11-01
Fletcher, Marlon T. (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Field winding circuits
C318S700000, C318S716000, C318S560000, C318S132000, C318S254100, C318S434000
Reexamination Certificate
active
06960898
ABSTRACT:
A control unit is provided that controls a motor that opens and closes a door of an electric train such that, if an abnormality is detected by a position sensor, continuation of its open/closing operation can be maintained. The control unit includes an arrangement for computing the actual rotation speed and the magnetic polar position of the motor; a position sensor abnormality-detecting identifier unit for detecting abnormalities in the output of the position sensor; and a first controlling arrangement that generates voltage-instructing values by applying the magnetic polar position so as to cause a speed detection value to correspond to the speed instruction value. The control unit further includes a second controlling arrangement, which in turn includes an F/V arithmetic unit24and integrator25; and a switcher unit27. The F/V arithmetic unit24generates a voltage instruction value having a specific magnitude and phase corresponding to the speed instruction value by utilization of magnetic polar position data that is obtained via integration of a frequency corresponding to the speed instruction value. The switcher unit27selects either of the first and second controlling arrangements so as to generate voltage-instructing values for a power converter3. When the output of the position sensor is normal, the switcher unit27selects a specific voltage-instructing value delivered from the first controlling arrangement, whereas if the position of the sensor5is abnormal, the switcher unit27selects a specific voltage-instructing value delivered from the second controlling arrangement.
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Fletcher Marlon T.
Fuji Electric Systems Co., Ltd.
Rabin & Berdo P.C.
Smith Tyrone
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