Method and apparatus for detecting deviation of motor speed from

Details Method and apparatus for detecting deviation of motor speed from Method and apparatus for detecting deviation of motor speed from

1989-01-31

1990-10-23

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388903, 318366, 318803, G05B 500

Patent

active

049658476

ABSTRACT:
An adjustable frequency motor drive system for a hoist is disclosed in which the frequency of the power supply to the motor can be selectively varied and the speed of the motor will follow the varying frequency at a slip speed relative to the frequency. The slip speed of the motor may not exceed a value beyond which the motor can control the hoist load. Accordingly, a frequency value based on the frequency of the power supply to the motor is selected as the frequency which is not to be exceeded by the motor speed expressed as a frequency. Signals representative of the actual motor speed and the selected frequency value are compared and, if the signal representative of the motor speed exceeds the signal representative of the frequency value which is not to be exceeded, an output signal is produced which may be used to apply a brake which stops and holds the motor and hoist and thereby maintains the load suspended. A motor speed deviation time period may also be provided and the hoist brake not applied to the motor until the time period is exceeded.

REFERENCES:
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patent: 4745991 (1988-05-01), Turashashi
Yaskama Electric Mfg. Co., Ltd. Instruction Manual, Toe-C736-9, "P6 Speed Controllers", Mar. 1987.

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