DC Motor control circuit
First Claim
1. In a DC motor control circuit comprising a DC motor adapted to be driven in response to an operating voltage applied thereto and braking means defining a current path coupled in parallel with said DC motor for selectively braking said DC motor in response to a control signal applied thereto, the improvement comprising DC supply means for producing a DC signal, constant voltage means coupled intermediate said DC supply means and the parallel connection of said braking means and DC motor for selectively applying a constant operating voltage to said DC motor, said constant voltage means being adapted, in response to a control signal applied thereto, to cut-off the application of a constant operating voltage to said DC motor, and control means coupled directly to said constant voltage means and directly to said braking means for coincidentally applying a control signal to said constant voltage means and to said braking means to coincidentally brake said DC motor and cut-off the application of said operating voltage to said DC motor.
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Accused Products
Abstract
A DC motor control circuit for providing improved starting and stopping control is provided. The control circuit includes a DC motor that is driven in response to an operating voltage applied thereto. A shunting element is adapted to define a current path in parallel with the DC motor to selectively shunt the operating voltage applied to the DC motor. A DC supply is provided for producing a DC signal, and a constant voltage supply circuit is coupled intermediate the DC supply and the parallel connection of the shunt element and DC motor to selectively apply a constant operating voltage to the DC motor. A control circuit is provided for coincidentally applying a control signal to the constant voltage circuit and to the shunt element to effect a coincident shunting of the operating voltage applied to the DC motor and a cutting-off of the application of the operating voltage to the DC motor.
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Citations
12 Claims
- 1. In a DC motor control circuit comprising a DC motor adapted to be driven in response to an operating voltage applied thereto and braking means defining a current path coupled in parallel with said DC motor for selectively braking said DC motor in response to a control signal applied thereto, the improvement comprising DC supply means for producing a DC signal, constant voltage means coupled intermediate said DC supply means and the parallel connection of said braking means and DC motor for selectively applying a constant operating voltage to said DC motor, said constant voltage means being adapted, in response to a control signal applied thereto, to cut-off the application of a constant operating voltage to said DC motor, and control means coupled directly to said constant voltage means and directly to said braking means for coincidentally applying a control signal to said constant voltage means and to said braking means to coincidentally brake said DC motor and cut-off the application of said operating voltage to said DC motor.
Specification