Motor operating parameter sensing apparatus

Details Motor operating parameter sensing apparatus Motor operating parameter sensing apparatus

1981-10-26

1985-01-01

Truhe, J. V.

Electricity: motive power systems

Limitation of motor load, current, torque or force

318810, 318282, 318599, 318440, 318286, H02K 1734

Patent

active

044917759

ABSTRACT:
A motor operated valve, typically a butterfly valve driven by a synchronous electric motor (16), is provided with a torque sensing arrangement wherein an cyclic electrical signal representative of the rotational speed of the motor is produced by magnets (22) on disc driven by the motor and Hall effect switches (23,24). The frequency of this signal is compared in a circuit (43) with the frequency of current supplied to the motor to provide an indication of motor torque. Switches (46,47) define preset torque limits for the valve. If the limits are exceeded, a signal is fed to control logic (41) which operates switches (18) to control the supply current to the motor. The speed signal from the Hall effect switches is also fed to a counter (31) to develop a count representative of movement of the valve. The output of counter (31) is compared with preset valves defined by switch circuits (37,38) to define limits of travel for the valve.

REFERENCES:
patent: 2940038 (1960-06-01), Probert
patent: 3322994 (1967-05-01), Dever et al.
patent: 3612972 (1971-10-01), Konig
patent: 3997826 (1976-12-01), Mayer
patent: 4016432 (1977-04-01), Marzalek
patent: 4084120 (1978-04-01), Lund
patent: 4091662 (1978-05-01), Emanuel
patent: 4097786 (1978-06-01), Lund
patent: 4227137 (1980-10-01), Hartman
patent: 4364111 (1982-12-01), Jocz
Boehm, V. et al., "A Digital Instrument for Measuring the Slippage of Asynchronous Motors", Electronic Engineering, Feb. 1967, pp. 106-109.

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