Valve Actuator Having Synchronous Motor Having Plastic Bushings
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United States of America Patent
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N/A
Issued Date -
Oct 6, 2011
app pub date -
Apr 2, 2010
filing date -
Apr 2, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A synchronous motor and a valve having a valve actuator and valve assembly is provided. The valve actuator includes the synchronous motor. The synchronous motor utilizes a magnetic coil, a stator and a rotor to generate rotational movement to drive the valve member for the valve assembly. The valve has a normal state in which the valve is maintained when power is not supplied to the motor. The valve has a non-normal actuated state when power is supplied to the motor. The motor is stalled in the non-normal state to maintain the valve in that state. The rotor includes a rotor shaft that passes through a magnetic hub of the stator. The rotor shaft is supported by a plurality of plastic and/or nylon bearings to prevent corrosion therebetween when the rotor shaft and bearings remain in a substantially fixed orientation for an extended period of time.
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