Electricity: motor control systems – Open loop speed control system for dc motor with commutator – Analog armature control
Patent
1993-06-18
1995-05-16
Shoop, Jr., William M.
Electricity: motor control systems
Open loop speed control system for dc motor with commutator
Analog armature control
388937, 318650, H02P 7288
Patent
active
054168856
ABSTRACT:
A speed control device for a DC motor controls the rotational speed of the DC motor through adjustment of a duty cycle of a semiconductor switching element. The rotational speed to be obtained is determined by an amount of operation of an operation member. A second contact switch is arranged to bypass the semiconductor switching element and is turned on to eliminate influence of the internal resistance of the semiconductor switching element. A power source contact switch is provided between a power source and the DC motor and is turned on and off through operation of the operation member. A switch-on forcing signal generation circuit and a switch-off forcing signal generation circuit are provided to forcibly switching on and off the second contact switch and the power source contact switch immediately before turning on and off thereof, respectively, so that the second contact switch may not be turned on and off when the semiconductor switching element is off and that the power source contact switch may not be turned off when the semiconductor switching element is on.
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Makita Corporation
Masih Karen
Shoop Jr. William M.
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