Enhanced Stator Structure for DC Motors and Electrical Appliances

This utility model discloses a stator structure, a DC motor, and electrical appliances using the structure. The design relates to DC motor technology. The stator structure includes a stator core, an insulating frame mounted on the core, and windings on the frame. The stator core has multiple teeth, and the insulating frame provides matching toothed covers. Each tooth and each cover includes a tooth crown. The tooth crown of the cover is wider than that of the core tooth. This wider crown blocks the enameled wire and keeps it from jumping out of the frame slot between adjacent covers. The reduced gap between the two covers prevents wire escape and helps avoid safety risks.

Technical Field

This utility model relates to the field of DC motor technology, and more specifically, to a stator structure, a DC motor and electrical appliances including the stator structure.

Background Technology

The DC motor’s stator structure consists of a stator core, an insulating frame, and windings arranged on the frame. The stator core includes a yoke and multiple teeth, with stator slots formed between adjacent teeth. The opening of each stator slot corresponds to the gap between the crowns of two neighboring teeth. The insulating frame features a circular ring frame and several toothed covers placed along its inner ring. After assembly, the toothed covers wrap around the teeth and create frame slots that hold the windings. The gap between two adjacent covers forms the frame slot opening.

In conventional designs, the width of the skeleton slot often matches—or is even slightly smaller than—the width of the stator slot. As the winding occupies more space, meaning the slot fill factor becomes high, the enameled wire tends to slip out of the skeleton slot. Once it jumps out, it may rub against the tooth crown of the stator core and introduce potential safety risks.

Because of this issue, engineers must find a way to stop the enameled wire from escaping the skeleton slot. Solving this problem is essential for improving the safety and reliability of stator structures in DC motors.

Stator structure for DC motor and electrical appliances

Utility Model Content

Purpose of the Utility Model

This utility model aims to provide a stator structure, a DC motor, and electrical appliances equipped with this stator structure. The design prevents enameled wires from slipping out of the skeleton slot, a problem common in conventional stator assemblies and one that may create safety risks.

Technical Solution

The stator structure includes a stator core, an insulating skeleton mounted on the core, and windings placed on the skeleton. The stator core has multiple teeth, and the skeleton provides a separate toothed cover for each tooth. Each tooth and each cover includes a tooth crown. The tooth crown on the cover is wider than the crown on the tooth. This added width blocks part of the slot opening between adjacent covers. As a result, the side of each cover holds the enameled wire inside the slot and prevents it from jumping out during winding or operation.

DC motor stator assembly with enhanced safety design

Functional Effects

This design enhances safety and stability. The wider tooth crowns reduce the gap between adjacent covers, which guides the wire more effectively during winding. The partially covered slot opening also limits unwanted lateral movement of the wire. When the slot fill factor becomes high, the tooth crowns act as firm barriers and keep the windings inside the slot. Thus, the structure eliminates the risk of wire escape and reduces safety issues found in existing stator designs.

This utility model also provides an electrical appliance, including a DC motor, which is the DC motor described in the above embodiments. The electrical appliance can be, but is not limited to, an air conditioner, a refrigerator, etc. With this configuration, the DC motor of the electrical appliance includes a stator structure, which has a stator core 1 and an insulating frame 2. The tooth width of the toothed cover of the insulating frame 2 is greater than the crown width of the toothed portion of the stator core 1, which can prevent the enameled wire in the frame slot 4 from jumping out through the frame slot opening 5, thus increasing the safety factor of the DC motor and improving the stability of the electrical appliance. The derivation process of this beneficial effect is largely similar to the derivation process of the beneficial effects brought by the stator structure and the DC motor, so it will not be repeated here. In this embodiment, the electrical appliance is an air conditioner, and the DC motor is the DC motor in the air conditioner.