SU1628157A1 - Method of fabricating wrapped core of stepper motor - Google Patents

Abstract

The invention relates to electrical engineering, in particular to the manufacture of stepper motors for quartz watches. The purpose of the invention is to reduce the labor intensity of manufacturing a stepper motor coil by simplifying the processing of the core. A method of manufacturing a wound core of a stepper motor is to insulate the core 1 by winding an insulated wire 2 onto it with an additional thermoplastic coating and sintering during the winding process. 1 il.

Description

The invention relates to electrical engineering. in particular for the manufacture of stepper motors for quartz watches.

The purpose of the invention is to reduce the complexity of manufacturing a coil of a stepper 5 motor by simplifying the processing of the core.

The drawing shows an isolated core.

When applying the proposed method, the need to remove sharp edges and burrs from the core of the stepper motor coil is eliminated, since a copper wire with electrical insulation and with an additional thermoplastic adhesive layer is used as the electrical insulating coating of the core. This wire is wound on the middle part of the core to be insulated in 1-3 layers with simultaneous sintering of coils. 20

To ensure electrical insulation of the metal core from the winding of the control coil before it is wound on the core 1, 1-3 layers of copper wire 2 with electrical insulation are wound, the beginning and end of this winding being left free. In order to fix this winding 2 on the core 1, it is sintered due to the thermoplastic adhesive layer during winding by blowing with hot air. This operation is performed on equipment on which the main control winding of the stepper motor coil is wound.

The choice of the number of layers of the winding of the insulating layer of the core of the coil depends on the quality of adjustment of the equipment. When using one layer of winding wire, the winding machine should provide ordinary laying of turns, i.e. 40 without a gap between adjacent turns. In the event of a gap between adjacent turns, a failure of the coil of the main control winding into this gap and its closure to the exposed core is possible. Therefore, depending on the wear of the winding machines, it is better to use 2-3 layers of insulation, which completely eliminates the presence of bare core sections and screening of the stepper motor coils due to the closure of the main winding on the core.

An increase in the number of layers leads to an increase in the dimensions of the stepper motor coil, which is a drawback in the design of quartz watches,

The proposed method for manufacturing a stepper motor coil does not require careful preparation of the core (removing edges, burrs) before winding the electrically insulating layer, since only the inner sides of the turns of the insulating winding are in contact with the core, and the outer side of the turns retains the insulating layer and is not subject to mechanical stress. Since the ends of the insulating coil 25 are open, the outer sides of the glued turns form an insulating layer for the base of the main winding of the stepper motor coil.

Claims (1)

30 Claims A method of manufacturing a wrapped core of a stepper motor, including insulating the core and winding the coil from an insulated wire, characterized in that, in order to reduce the complexity by simplifying the processing of the core, the core is insulated by winding an insulated wire with an additional thermoplastic sintered coating during winding.