Motor controller with an improved stopping technique

Details Motor controller with an improved stopping technique Motor controller with an improved stopping technique

1990-04-26

1990-12-18

Shoop, Jr., William M.

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

318763, 318368, H02P 318

Patent

active

049788973

ABSTRACT:
An electric motor has first, second and third stator windings supplied by a source of alternating voltage having three phases A, B and C, respectively. A separate thyristor switch assembly couples each stator winding to an alternating voltage phase when said switch means is rendered conductive by a trigger signal. When the speed of the motor is above a first predefined level, the thyristor switch assemblies are triggered, in response to the polarity of the voltage between phases A and B being opposed to the polarity of back emf voltage induced across the third winding, to apply current through said first and second stator windings. However, when the speed of the motor is below the first predefined level, the thyristor switch assemblies are triggered, in response to the polarity of the voltage betwen phases B and C being opposed to the polarity of back emf voltage induced across the third winding, to apply current through said second and third stator windings. Subsequently when the speed of the motor further decreases below a second predefined level, current is applied through said second and third stator windings during every cycle of the voltage between phases B and C.

REFERENCES:
patent: 3376485 (1968-04-01), Shibata et al.
patent: 3569809 (1971-03-01), Comer
patent: 3649894 (1972-03-01), Yoneya
patent: 3652924 (1972-03-01), Dieterich et al.
patent: 3708734 (1973-01-01), Rowe
patent: 3795850 (1974-03-01), Grygera
patent: 4151453 (1979-04-01), Suzuki et al.
patent: 4227129 (1980-10-01), Brooks
patent: 4230979 (1980-10-01), Espelage et al.
patent: 4238717 (1980-12-01), Knight et al.
patent: 4374352 (1983-02-01), Webster
patent: 4392098 (1983-07-01), Min
patent: 4459528 (1984-07-01), Nola
patent: 4459529 (1984-07-01), Johnson
patent: 4482853 (1984-11-01), Bhavsar
patent: 4518902 (1985-03-01), Melocik et al.
patent: 4556836 (1985-12-01), Antognini
patent: 4607205 (1986-08-01), Kito et al.
patent: 4612490 (1986-09-01), Kagi
patent: 4636936 (1987-01-01), Boyd, Jr. et al.
patent: 4833386 (1989-05-01), Unsworth

Affiliated with

Also associated with

Rating

Motor controller with an improved stopping technique does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Motor controller with an improved stopping technique, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor controller with an improved stopping technique will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1427704