Dynamic braking apparatus for a motor
First Claim
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1. A control apparatus for a motor having m stator windings where m is an integer greater than one, said control apparatus comprising:
- a power source for providing power;
a first switch for alternatively applying or removing power;
a control circuit coupled between the power source and the m stator windings for controlling the application of power to said m stator windings;
a second switch coupled between the control circuit and (m-1) of said m stator windings, the other stator winding being coupled to the control circuit independently of the second switch, said second switch including (m-1) switch contacts respectively connected in series with said (m-1) stator windings and responsive to the first switch, said (m-1) switch contacts (1) moving to a first position connecting said control circuit to said (m-1) stator windings and supplying power between the control circuit and said (m-1) stator windings when the first switch applies power and (2) moving to a second position connecting said (m-1) stator windings to said other stator winding and to each other when the first switch removes power wherein each of said m stator windings are short circuited to each of the other m stator windings, thereby switching said motor into a dynamic braking mode.
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Abstract
A control apparatus for a motor including m number of stator windings and a relay having m-1 contacts, thereby allowing the control apparatus to be simplified in its structure so that the control apparatus can be constructed at a low cost.
24 Citations
3 Claims
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1. A control apparatus for a motor having m stator windings where m is an integer greater than one, said control apparatus comprising:
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a power source for providing power; a first switch for alternatively applying or removing power; a control circuit coupled between the power source and the m stator windings for controlling the application of power to said m stator windings; a second switch coupled between the control circuit and (m-1) of said m stator windings, the other stator winding being coupled to the control circuit independently of the second switch, said second switch including (m-1) switch contacts respectively connected in series with said (m-1) stator windings and responsive to the first switch, said (m-1) switch contacts (1) moving to a first position connecting said control circuit to said (m-1) stator windings and supplying power between the control circuit and said (m-1) stator windings when the first switch applies power and (2) moving to a second position connecting said (m-1) stator windings to said other stator winding and to each other when the first switch removes power wherein each of said m stator windings are short circuited to each of the other m stator windings, thereby switching said motor into a dynamic braking mode. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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Original AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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InventorsIshitobi, Chikato
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Primary Examiner(s)Ro, Bentsu
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Application NumberUS07/427,953Time in Patent Office468 DaysField of Search318/138, 318/254, 318/370, 318/371, 318/373, 318/375, 318/379, 318/380, 318/439, 318/703, 318/744, 318/757, 318/759, 318/760US Class Current318/375CPC Class CodesH02P 3/22 by short-circuit or resisti...
