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Home Generators or Motors Method-and-system-for-sensing-switch-position-to-prevent-inadvertent-startup-of-a-motor

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Details
Inventors: Brotto, Daniele C;
Assignee: Black & Decker Inc. (Newark, DE)
Primary Examiner: Sircus; Brian
Assistant Examiner: Cavallari; Daniel
Attorney, Agent or Firm: Harness, Dickey & Pierce, P.L.C.

A method for preventing sudden inadvertent operation of a motor of a tool or appliance when the motor is initially electrically connected to a power source while an On/Off switch for controlling the motor is in a closed (i.e. `On`) position. The method includes electrically connecting the motor to a power source and determining a position of the On/Off switch when the motor is initially electrically connected to the power source. The position of the On/Off switch is determined by either sensing whether current is flowing through the motor or voltage is present at the motor when the motor is initially connected to the power source.

DETAILED DESCRIPTION A method and system in accordance with an aspect of the invention prevents inadvertent startup of a motor when the motor is initially connected to a power source with a motor control (i.
e.
, On/Off) switch controlling the motor in the "On" position.
The method determines whether the On/Off switch is in the On position when the motor is initially connected to the power source by sensing an electrical parameter of the motor.
In an aspect of the invention, the electrical parameter of the motor is whether current is flowing through the motor.
In another aspect of the invention, the electrical parameter is whether voltage is present at the motor.
In an aspect of the invention, the system also includes an electronic switch for switching the motor on and off and a controller that determines whether the motor control switch is on or off when the motor is initially connected to the power source.
The controller also controls how much power is provided to the motor based on the position of the motor control switch when the motor is initially connected to the power source.



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