Speed control system for conveying machine energized by three-phase current专利检索-三相电流电路专利检索查询-专利查询网

Speed control system for conveying machine energized by three-phase current

阅读：563发布：2023-07-29

专利汇可以提供Speed control system for conveying machine energized by three-phase current专利检索，专利查询，专利分析的服务。并且An ideal value transmitter provides an ideal value voltage corresponding in magnitude to a desired speed of a conveying machine. An actual value transducer coupled to the rotor of the conveying machine provides an actual value voltage corresponding in magnitude to the actual speed of the machine. A three point controller connected to the transmitter and transducer provides a control signal equal to the difference in magnitude between the ideal and actual value voltages. Two reversing contactors coupled to the controller and connected to the stator of the machine supplies three-phase current to the machine under the control of the control signal provided by the controller. A direct current contactor coupled to the controller and connected to the stator of the machine supplies direct current to the machine under the control of the control signal.，下面是Speed control system for conveying machine energized by three-phase current专利的具体信息内容。

权利要求

1. A speed control system for a conveying machine energized by three-phase current, said conveying machine having a rotor and a stator, said speed control system comprising an ideal value transmitter for providing an ideal value voltage corresponding to a desired speed of said conveying machine, an actual value transducer coupled to the rotor of said conveying machine for providing an actual value voltage corresponding in magnitude to the actual speed of said conveying machine, three-point controller means connected to said ideal value transmitter and to said actual value transducer for providing a control signal equal to the difference in magnitude between said ideal and actual value voltages, reversing contactor means coupled to said controller means and connected to the stator of said conveying machine for supplying three-phase current to the stator of said conveying machine under the control of the control signal provided by said controller means, and direct current contactor means coupled to said controller means and connected to the stator of said conveying machine for supplying direct current to the stator of said conveying machine under the control of the control signal provided by said controller means, further comprising braking current controller means for providing maximum braking current for said conveying machine, input connecting means for selectively applying said ideal value voltage to actuate said braking current controller means, and output connecting means for supplying said maximum braking current to said conveying machine via said direct current contactor means, and wherein the input connecting means of said braking current controller means further comprises emergency switch means connected between said ideal value transformer and said time relay means for initiating emergency braking.

2. A speed control system as claimed in claim 1, wherein the output connecting means of said braking current controller means comprises braking current transformer means connected between said braking current controller means and said direct current contactor means.

3. A speed control system as claimed in claim 1, wherein operation of said emergency switch means connects said ideal value transformer to said braking current controller means and disconnects said actual value transducer from said braking current controller means.

4. A speed control system as claimed in claim 1, wherein the output connecting means of said braking current controller means comprises braking current transformer means connected to said braking current controller means and low voltage protective means connected in series with said braking current transformer means to said direct current contactor means for protecting against ground fault.

5. A speed control system as claimed in claim 1, further comprising interlocking means coupled to said reversing contactor means for interlocking said reversing contacting means and wherein the output connecting means of said braking current controller means comprises braking current transformer means connected to said braking current transformer means and short circuit protective means connected in series with said braking current transformer means to said direct current contactor means for protecting against failure of said interlocking means.

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Speed control system for conveying machine energized by three-phase current

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