Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1990-02-02
1991-06-11
Shoop, Jr., William M.
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
388815, 388906, 318254, 364157, 364161, H02P 600
Patent
active
050239244
ABSTRACT:
In order to provide a speed control apparatus for a movable equipment having small torque ripples and speed variation, the present invention has a speed control means which comprises a driver for providing a current or a voltage having a magnitude corresponding to the instructed speed, a speed detection circuit for detecting a speed on the basis of a signal from the speed detector and a microcomputer for driving the driver by comparing the speed instruction signal with a speed signal obtained from the speed detection circuit. The microcomputer includes a harmonic wave component detecting means for detecting a harmonic wave component contained in a speed variation mode which is obtained from the speed detection circuit and has a function of making the gain of a speed control system variable by the harmonic wave component detected by the harmonic wave component detecting means.
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Minimization of Torque Ripple in Brushless DC Motor Drives; vol. IA-22 IEEE No. 4 July/Aug. 1986 NY.
Katayama Hiroshi
Miyashita Kunio
Morinaga Shigeki
Narushima Seiichi
Tajima Fumio
Hitachi , Ltd.
Martin David
Shoop Jr. William M.
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