Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1988-06-17
1989-09-12
Dobeck, Benjamin
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
388817, 388901, 388903, H02P 500
Patent
active
048663565
ABSTRACT:
A circuit for controlling the speed of a subfractional horsepower DC motor has a driver stage with a switch that interrupts the motor current in repeated succession so that a pulse-like current is provided, and the motor EMF is sampled synchronously with the motor current interruption, with the sampled value being supplied to a comparator wherein it is compared to a rated value. The output of the comparator is used to control the driver stage which includes the switch. Two pulse duration modulators are provided which respectively independently control the motor current and voltage. The pulse duration modulator which controls the current generates pulse pauses which are always sufficiently long to permit the EMF measurement to be completed. The pulse duration modulator operates at a frequency above the audible frequency range so that its pulse pauses are short enough to prevent the motor current from noticeably failing or being completely interrupted.
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patent: 3536972 (1970-10-01), Lutz et al.
patent: 3588654 (1971-06-01), Balazs
patent: 4061950 (1977-12-01), Kayanuma
patent: 4454573 (1984-06-01), Petsch et al.
patent: 4508999 (1985-04-01), Melocik et al.
patent: 4510423 (1985-04-01), Iwasawa
patent: 4734630 (1988-03-01), Okano
Dobeck Benjamin
Siemens Aktiengesellschaft
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