Electrical series motor with dynamic braking circuit

Details Electrical series motor with dynamic braking circuit Electrical series motor with dynamic braking circuit

1989-11-09

1992-03-24

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Dynamic braking

318258, H02P 312

Patent

active

050991841

ABSTRACT:
To provide sufficient magnetization to the field of a series motor when the series motor is to be operated in dynamic braking mode, with a dissipating resistor or short circuit element (4) connected across the armature (5), a circuit connection is established between one of the main terminals of the motor through the series field to supply a minimum magnetization current, at least when the motor operates under dynamic braking conditions, typically a few to up to 15% of no-load current of the motor. This is sufficient magnetization so that, even in larger motors where remanent magnetism of the field structure is insufficient, reliable dynamic braking can be ensured. A switch (S; S.sub.1, S.sub.2) selectively connects the motor armature for motor drive or running operation and dynamic braking operation. The magnetization current supply can be through a capacitor, resistor, or resistor-capacitor combination, which can be permanently connected across the power supply (10, 11) of the motor, or connected in circuit only when the switch (S, S.sub.2) changes the motor into dynamic braking operation.

REFERENCES:
patent: 3899041 (1975-08-01), Mager
patent: 3983465 (1976-09-01), Tsuboi et al.
patent: 4087727 (1978-05-01), Horiuchi et al.
patent: 4096423 (1978-06-01), Bailey et al.
patent: 4352049 (1982-09-01), Franz, Jr.
patent: 4471277 (1984-09-01), Franz, Jr.
patent: 4812728 (1989-03-01), Yang

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