Plugging electrical braking control circuit
First Claim
1. In an apparatus (10) for electrically braking a motor (12), said apparatus (10) having means (88) for generating a plurality of different motor power command signals each in response to a respective motor speed command, and controllable supplying means (22) for delivering motor power control signals to said motor (12), the improvement comprising:
- means (14) for supplying a plug signal in response to plugging of said motor (12);
means (56) for supplying a current signal in response to the magnitude of current passing through said motor (12); and
,blocking means (102) for receiving said current signal and said plug signal, and limiting said current to a first preselected maximum magnitude in response to the receiving of said plug signal and to a second preselected maximum magnitude in response to the absence of said plug signal, said blocking means (102) including means (98) for controllably modifying said control signals.
1 Assignment
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Accused Products
Abstract
The invention pertains to a control system (46) for controlling the supply of power to a motor (12) to produce plugging electrical braking and current limit control, including a circuit (60) for controlling the direction of energization of the motor (12), a circuit (88) for generating digital numbers representing command motor speeds, a circuit (14) for generating a data signal representing a plugging condition, a programmable data processor (18) for generating pulse trains in dependence on the plugging condition, and a power transistor element (40) for coupling power to the motor (12) in response to the pulse trains. By using state-of-the-art digital, integrated circuit and software technology, prior, essentially linear or discrete component technology, which is relatively unreliable, expensive and slow, need not be used.
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Citations
11 Claims
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1. In an apparatus (10) for electrically braking a motor (12), said apparatus (10) having means (88) for generating a plurality of different motor power command signals each in response to a respective motor speed command, and controllable supplying means (22) for delivering motor power control signals to said motor (12), the improvement comprising:
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means (14) for supplying a plug signal in response to plugging of said motor (12); means (56) for supplying a current signal in response to the magnitude of current passing through said motor (12); and
,blocking means (102) for receiving said current signal and said plug signal, and limiting said current to a first preselected maximum magnitude in response to the receiving of said plug signal and to a second preselected maximum magnitude in response to the absence of said plug signal, said blocking means (102) including means (98) for controllably modifying said control signals.
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2. In an apparatus (10) for electrically braking a motor (12), said apparatus (10) having means (88) for generating a plurality of different motor power command signals each in response to a respective motor speed command, and controllable supplying means (22) for delivering motor power control signals to said motor (12), the improvement comprising:
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means (14) for supplying a plug signal in response to plugging of said motor (12); processor means (18) for receiving said plug signal and said command signals and delivering a preselected one of said motor power control signals to said supplying means (22) in response to said received command signals being in a preselected range and to the receiving of said plug signal; means (56) for supplying a current signal in response to the magnitude of current passing through said motor (12); and
,blocking means (102) for receiving said current signal and said plug signal, and limiting said current to a first preselected maximum magnitude in response to the receiving of said plug signal and to a second preselected maximum magnitude in response to the absence of said plug signal. - View Dependent Claims (3, 4)
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5. In an apparatus (10) for electrically braking a motor (12), said apparatus (10) having means (88) for generating a plurality of different motor power command signals each in response to a respective motor speed command, and controllable supplying means (22) for delivering motor power control signals to said motor (12), the improvement comprising:
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means (14) for supplying a plug signal in response to plugging of said motor (12); processor means (18) for receiving said plug signal and said command signals and delivering a preselected one of said motor power control signals to said supplying means (22) in response to said received command signals being in a preselected range and to the receiving of said plug signal, and in response to receiving each of said motor power command signals in the absence of said plug signal; means (56) for supplying a current signal in response to the magnitude of current passing through said motor (12); and
,blocking means (102) for receiving said current signal and said plug signal, and limiting said current to a first preselected maximum magnitude in response to the receiving of said plug signal and to a second preselected maximum magnitude in response to the absence of said plug signal. - View Dependent Claims (6, 7)
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8. A motor braking apparatus (10), comprising:
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an accelerator pedal (92) being movable to a plurality of motor speed command positions; means (88) for generating respective digital motor power command signals each in response to a different one of said command positions; means (14) for supplying a plug signal in response to plugging of said motor (12); processor means (18) for receiving said plug signal and said command signals, supplying a first preselected motor power control signal in response to the receiving of said command signals in a first preselected range and the receiving of said plug signal, and supplying a plurality of second preselected control signals in response to the receiving of said command signals in the absence of said plug signal; and
,controllable supplying means (22) for receiving said control signals and delivering respective pulse trains to said motor (12) in response to each of said control signals. - View Dependent Claims (9)
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10. A motor braking apparatus (10), comprising:
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means (14) for sensing plugging of said motor (12) and delivering a plug signal in response to said sensed plugging; means (88) for sensing a motor speed command and delivering a digital command signal in response to said command; means (56) for sensing motor current and delivering a current signal in response to the magnitude of said current; processor means (18) for receiving said plug signal and command signals and delivering a plurality of pulse trains in response to receiving said command signal in the absence of said plug signal, and delivering a preselected one of said plurality of pulse trains in response to receiving said command signals in a preselected range and receiving said plug signal; means (102) for receiving said current signal and said plug signal, controllably modifying said pulse trains, and limiting said current to a first preselected maximum magnitude in response to receiving said plug signal and said current signal and limiting said current to a second preselected maximum magnitude in response to receiving said current signal in the absence of said plug signal; and
,controllable supplying means (22) for receiving said pulse trains and delivering said pulse trains to said motor (12). - View Dependent Claims (11)
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Specification