防开裂换向器
By setting semi-dovetail grooves and protrusions on the commutator body and designing symmetrical right-angled trapezoidal grooves on the rear end face of the mica sheet, a three-level anti-detachment mechanism and multi-point anchoring are formed, which solves the problems of commutator cracking and flying segments, and improves the stability of the motor and the production yield.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- RUIAN BOYU TECH CO LTD
- Filing Date
- 2026-06-04
- Publication Date
- 2026-07-17
AI Technical Summary
Existing commutators are prone to cracking and commutator segments are prone to flying off at high speeds, leading to problems with motor stability and safety.
The commutator body features a combination structure of semi-dovetail grooves and protrusions, while the rear end face of the mica sheet has symmetrical right-angled trapezoidal grooves. Through compression molding, a three-level anti-detachment mechanism and a multi-point anchoring structure are formed to enhance the bonding force.
It effectively prevents commutator segments from flying off, avoids cracking of the plastic surface, and improves production yield and motor stability.
Smart Images
Figure CN224520406U_ABST
Abstract
Claims
1. A crack-resistant commutator, comprising a bakelite powder substrate (1), a plurality of commutator segments (2) and a plurality of mica sheets (3), wherein the commutator segments (2) and mica sheets (3) are alternately embedded in the bakelite powder substrate (1); wherein the commutator segment (2) comprises a body (21) and a copper foot (22) located at the bottom of the body (21); characterized in that: The main body (21) of the commutator (2) has a first side surface (23) near the raised platform. A half dovetail groove (24) is provided on the first side surface (23). The half dovetail groove (24) is composed of a horizontal surface (241) and an inclined surface (242). The horizontal surface (241) is arranged along the length direction of the main body (21) and is parallel to the top surface of the main body (21). The inclined surface (242) extends outward and downward from the inner end of the horizontal surface (241). On the first side (23), above the semi-dovetail groove (24), a protrusion (25) is also provided, the root of which is directly connected to the cross surface (241) of the semi-dovetail groove (24). A connecting part (26) is provided between the bottom of the main body (21) of the commutator segment (2) and the copper foot (22). The longitudinal section of the connecting part (26) along the width direction of the main body (21) is dovetail-shaped. The mica sheet (3) has a rear end face (31) facing the lifting platform. The rear end face (31) and the first side face (23) of the commutator (2) both face the lifting platform. At least one set of trapezoidal slots are provided on the rear end face (31). Each set of trapezoidal slots includes two symmetrically arranged right-angled trapezoidal slots (32). The right-angled sides (324) of the two right-angled trapezoidal slots (32) are close to each other. Each right-angled trapezoidal slot (32) penetrates the mica sheet (3) along the circumference of the commutator.
2. The anti-cracking commutator according to claim 1, characterized in that: The bottom (321) and opening (322) of the right-angled trapezoidal groove (32) are connected by a hypotenuse (323) and a right-angled side (324), and the angle between the hypotenuse (323) and the bottom (321) is 30° to 60°; the width of the bottom (321) of the right-angled trapezoidal groove (32) is 1.5 to 3 times the width of the opening (322).
3. The crack resistant commutator of claim 1, wherein: The included angle between the two inclined sides (323) of the dovetail-shaped longitudinal section of the connecting part (26) is 20° to 60°.
4. The crack resistant commutator of claim 1, wherein: The right-angled trapezoidal groove (32) on the rear end face (31) of the mica sheet (3) has a further recessed bottom (321) to form an arc-shaped stress dispersion groove (33), which extends circumferentially along the commutator.
5. The crack resistant commutator of claim 4, wherein: The radius of the arc of the stress dispersion groove (33) is 0.3 to 0.6 times the depth of the right-angled trapezoidal groove (32).