Pulse controllers
First Claim
1. A method for controlling the regenerative braking of a D.C. electric motor having a plugging diode normally forming a short circuit around the armature of the motor, wherein an electronic switch is provided in the motor armature circuit to control regenerative braking current, comprising the steps of:
- opening the short-circuit, alternately rendering the electronic switch conductive and non-conductive in a class 3 mode of operation, and choosing and maintaining a predetermined interrelationship of the conductive and non-conductive periods of the switch such that the switch alternates between its conductive and non-conductive states, regardless of the ratio between the periods and regardless of the motor speed, at a rate sufficient to automatically maintain the instantaneous motor current within desired maximum and minimum limits, said periods being determined solely by said predetermined relationship without any additional step for setting said desired maximum and minimum limits of instantaneous motor current.
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Accused Products
Abstract
A pulse controller for controlling the energization and regenerative braking of a DC electric motor. An electronic switch connects the motor to a power source during motor driving and controls motor current during regenerative braking, the switch being rendered alternately conductive and non-conductive during both driving and braking and the ratio of conductive to non-conductive periods being controlled. The conductive and non-conductive periods are interrelated such that, regardless of the ratio between the periods, during regenerative braking the switch alternates between its conductive and non-conductive states at a rate sufficient to automatically maintain the generated motor current within desired maximum and minimum limits.
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Citations
15 Claims
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1. A method for controlling the regenerative braking of a D.C. electric motor having a plugging diode normally forming a short circuit around the armature of the motor, wherein an electronic switch is provided in the motor armature circuit to control regenerative braking current, comprising the steps of:
- opening the short-circuit, alternately rendering the electronic switch conductive and non-conductive in a class 3 mode of operation, and choosing and maintaining a predetermined interrelationship of the conductive and non-conductive periods of the switch such that the switch alternates between its conductive and non-conductive states, regardless of the ratio between the periods and regardless of the motor speed, at a rate sufficient to automatically maintain the instantaneous motor current within desired maximum and minimum limits, said periods being determined solely by said predetermined relationship without any additional step for setting said desired maximum and minimum limits of instantaneous motor current.
- View Dependent Claims (2, 4, 5, 7, 10, 11, 12, 13, 14, 15)
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3. In a pulse controller for controlling the energisation and regenerative braking of a DC electric motor, including an electronic switch for connecting the motor to a power source during motor driving and for controlling motor current during regenerative braking, and means for rendering the electronic switch alternately conductive and non-conductive, the improvement characterized by:
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a plugging diode norally forming a short-circuit around the armature of said motor, and means for opening the short-circuit during regenerative braking; and circuit means for controlling the ratio of conductive to non-conductive periods of said switch in a class 3 mode to control the motor current during regenerative braking, so that the conductive and non-conductive periods are interrelated to maintain motor current ripple substantially constant, and so that, regardless of the ratio between the periods and regardless of the speed of the motor, the electronic switch alternates between its conductive and non-conductive states at a rate sufficient to automatically maintain the instantaneous motor current within desired maximum and minimum limits, said switch being in the motor armature circuit, said motor current being maintained within said desired maximum and minimum limits solely by said interrelated periods and without the need for any additional means for setting said maximum and minimum limits. - View Dependent Claims (6, 8, 9)
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Specification