Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Analog armature control
Patent
1993-04-27
1995-05-09
Shoop, Jr., William M.
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Analog armature control
388840, 388937, 200522, 2003322, H01H 906
Patent
active
054147930
ABSTRACT:
A speed control mechanism allowing a user to control the operating speed of a power tool. The speed control mechanism includes a drive motor and a handle connected to the power tool including a trigger, a speed governor and a cam assembly. The trigger is displaced from a first position by the user to initiate operation of the drive motor. The trigger cooperates with the speed governor to vary the operating speed of the drive motor based on the displacement of the trigger. The cam control assembly is operated by the user and cooperates with the trigger to control the extent to which the trigger can be displaced from the first position by the user, thereby limiting the operating speed of the motor. In one embodiment, the speed control mechanism is for use with the drive motor of the power tool to control the operating speed of the power tool. In an alternative embodiment, the speed control mechanism is used with a radial arm saw including an anti-kick forward device. In this embodiment, the speed control mechanism controls the operating speed of the motor of the anti-kick forward device, allowing the user to limit the rate at which the saw blade can be moved.
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Ryobi Motor Products Corp.
Shoop Jr. William M.
Sircus Brian
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