Motor stoppage apparatus and method using back emf voltage

Details Motor stoppage apparatus and method using back emf voltage Motor stoppage apparatus and method using back emf voltage

1989-04-26

1990-04-10

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318757, H02P 300

Patent

active

049163701

ABSTRACT:
An electric motor is braked by applying pulses of current to a winding of the motor creating a negative torque which slows the motor. In order to detect when the motor has stopped and as a consequence, when to discontinue applying the current pulses, a periodic determination is performed as to whether the back emf voltage induced in a winding of the motor is within a range of defined values, such as between a positive reference voltage level and a negative reference voltage level. The application of pulses of current is terminated a given interval from when a predetermined number of consecutive determinations all indicate that the back emf voltage is within the range. The length of the given interval is derived from the amount of time between when the electricity began to be applied to brake the motor and the occurrence of the predetermined number of consecutive determinations.

REFERENCES:
patent: 3652924 (1972-03-01), Dieterich et al.
patent: 3795850 (1974-03-01), Grygera
patent: 4238717 (1980-12-01), Knight et al.
patent: 4417191 (1983-11-01), Schmidt
patent: 4459528 (1984-07-01), Nola
patent: 4459529 (1984-07-01), Johnson
patent: 4518902 (1985-05-01), Melocik et al.
patent: 4612490 (1986-09-01), Kagi
patent: 4833386 (1989-05-01), Unsworth
Smart Motor Controller (SMC), Bulletin 150-2.1-Apr., 1986.
Product Date Smart Motor Controller (SMC), Publication 150-2.1; Apr., 1986; Allen-Bradley Company, Inc.

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