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Variable Reluctance Stepping Motor

IP.com Disclosure Number: IPCOM000073772D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Darling, RH: AUTHOR

Abstract

With this process, motors can be manufactured with greatly reduced machining and assembly time and thus at a reduced cost. The process described is for manufacturing a motor having three stator coils as shown. The motor assembly includes stator 10 which is fabricated by initially sintering six identical stator pole halves such as 11 and 11A. Each of three identical torroidal coils 12, 12A and 12B, encapsulated with terminal blocks attached, are inserted between a pair of pole halves. The six stator pole halves containing 12, 12A and 12B along with spacers such as 13 are placed on a molding mandrel.

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Variable Reluctance Stepping Motor

With this process, motors can be manufactured with greatly reduced machining and assembly time and thus at a reduced cost. The process described is for manufacturing a motor having three stator coils as shown. The motor assembly includes stator 10 which is fabricated by initially sintering six identical stator pole halves such as 11 and 11A. Each of three identical torroidal coils 12, 12A and 12B, encapsulated with terminal blocks attached, are inserted between a pair of pole halves. The six stator pole halves containing 12, 12A and 12B along with spacers such as 13 are placed on a molding mandrel. The entire assembly is injection molded which retains the assembled stator halves, coils and spacers with respect to each other while forming the housings for bearings such as 14, the necessary appertances, such as mounting brackets , and the outer protective casing. The inner diameter is bored or reamed to the proper bearing dimensions and tolerances.

The rotor, assembled by more conventional processes, is shown mounted within bearing 14. The rotor pole pieces 15A, 15B and 15C are each slotted into a series of poles and mounted on the shaft so that there is an appropriate shift from one pole piece to the next. This is shown in the three partial sections for 15A - 15C on the right. The stator halves such as 11 contain similar slots which cooperate with 15 to effect stepper motor operation by sequential energizing of 12, 12A and 12B, a...