Rotor structure of starting motor

Abstract

A rotor structure of a starting motor comprises a rotor shaft, the rotor shaft is in interference fit with a rotor iron core and a commutator, and winding outgoing lines on the rotor iron core are welded with radial extension parts which are arranged at one end of the commutator and used for welding lead wires. The axial end, adjacent to the rotor iron core, of the commutator is provided with an insulating tray used for supporting a winding outgoing line, the diameter of the insulating tray is smaller than the bottom diameter of the commutator, and the thickness of the insulating tray is smaller than the distance between the commutator and the rotor iron core. The end face of one end, facing the rotor iron core, of the insulating tray is in arc transition with the circumference, and the connecting position of each winding leading-out wire of the rotor iron core and the commutator is supported by the insulating tray and used for preventing the winding leading-out wires from being bent and broken.

Description

Technical Field

[0001] The utility model relates to the field of starting motors, in particular to a rotor structure of a starting motor. Background Art

[0002] The starter motor is a crucial component in the engine starting system. Its primary function is to convert electrical energy into mechanical energy, driving the engine's flywheel and enabling the engine to enter self-running mode from a standstill. The starter motor typically draws power from a battery and generates rotational torque through a magnetic field. The starter motor's rotor is the rotating part of the electric motor. When power is applied, the rotor generates rotational motion through electromagnetic induction, driving the starter motor to generate mechanical energy.

[0003] In the prior art, the spacing between the winding lead wires of adjacent commutator segments on the connection flange on one side of the commutator is large, and there is a cavity inside the winding lead wire, resulting in a lack of support for the winding lead wire on one side of the commutator. During the operation of an engine or other equipment, the rotation of the motor rotor generates centrifugal force. Under the action of centrifugal force, coupled with resonance caused by the operation of the motor, under the influence of high-frequency vibration and other factors, the welding point between the winding lead wire and the commutator will experience desoldering and other phenomena due to the lead wire being suspended in the air and lacking support, resulting in intermittent short circuits and causing motor failure. Summary of the Invention

[0004] The purpose of the utility model is to address the problems existing in the prior art and provide a rotor structure for a starter motor. An insulating tray is provided at the axial end adjacent to the commutator and the rotor core. The insulating tray is used to fill the cavity inside the winding lead wire, thereby supporting the winding lead wire and preventing the winding lead wire from desoldering due to lack of support under conditions such as vibration, thereby improving the service life of the starter motor.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] A rotor structure for a starter motor includes a rotor shaft, on which a rotor core and a commutator are interference fit, respectively. Each winding lead wire on the rotor core is welded to a radial extension portion for welding the lead wire provided at one end of the commutator. An insulating tray for supporting the winding lead wire is provided at the axial end of the commutator adjacent to the rotor core. The diameter of the insulating tray is smaller than the bottom diameter of the commutator, the thickness of the insulating tray is smaller than the spacing between the commutator and the rotor core, and the end surface of the insulating tray facing one end of the rotor core and the circumference form an arc transition. The connection between each winding lead wire of the rotor core and the commutator is supported by the insulating tray to prevent the winding lead wire from bending or breaking.

[0007] Preferably, the radially extending portion for welding the lead wire is a wire flange.

[0008] Preferably, a plurality of wire embedding grooves are provided on the circumference of the wiring flange, and the winding lead wires are welded in the wire embedding grooves.

[0009] Preferably, the radial extension portion for welding the lead wire is a hook, and the winding lead wire is welded inside the hook.

[0010] Preferably, the insulating tray is made of thermosetting insulating plastic.

[0011] Preferably, the insulating tray is integrally injection-molded on the insulating sleeve of the commutator.

[0012] Preferably, the insulating tray is fixed to the rotor shaft by interference fit.

[0013] Preferably, the distance between the circumference of the insulating tray and the circumference of the wiring flange is the radius of the winding lead wire.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: an insulating tray is provided at the axial end adjacent to the commutator and the rotor core, and the end surface of the insulating tray facing one end of the rotor core and the circumference form an arc transition, which supports the winding lead wires connected to each commutator segment of the commutator, especially preventing the winding lead wires from being desoldered, bent, or broken due to lack of support under the influence of centrifugal force and vibration, causing intermittent short circuits and motor failure, thereby improving the stability and service life of the rotor structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 yes Figure 1 AA section view; DETAILED DESCRIPTION

[0017] See also Figure 1 and Figure 2A rotor structure of a starter motor includes a rotor shaft 1, wherein the rotor core 4 and the commutator 2 are respectively interference-fitted on the rotor shaft 1, and the rotor core 4 is insulated from the rotor shaft 1. In this embodiment, an insulating tape is wound around the rotor shaft 1 to provide insulation. The commutator 2 in this embodiment includes an insulating sleeve, a commutator segment, and a wiring flange 5. The insulating sleeve is sleeved on the rotor shaft 1, and the commutator segment is arranged on the outer periphery of the insulating sleeve. The wiring flange 5 is arranged at one end of the commutator 2. The winding lead wires on the rotor core 4 are connected to one end of the commutator. The radial extension for welding the lead wire is welded, and the radial extension for welding the lead wire is a wiring flange 5. The wiring flange 5 of each commutator segment of the commutator 2 is welded, and a plurality of wire embedding grooves are provided in the circumferential direction of the wiring flange 5. The winding lead wire is welded in the wire embedding groove, or the radial extension for welding the lead wire is a hook, and the winding lead wire is welded in the hook. An insulating tray 3 for supporting the winding lead wire is provided at the axial end adjacent to the rotor core 4 of the commutator 2; the insulating tray 3 is integrally injection-molded on the insulating sleeve of the commutator 2. The insulating tray 3 is mounted on the rotor shaft 1, or the insulating tray 3 is designed to be separated from the commutator 2, and the insulating tray 3 is fixed on the rotor shaft 1 by interference fit; the insulating tray 3 is made of thermosetting insulating plastic, and the thermosetting insulating plastic is specifically bakelite powder or glass fiber reinforced epoxy modified phenolic molding compound. The diameter of the insulating tray 3 is smaller than the bottom diameter of the commutator 2, and the distance between the circumference of the insulating tray 3 and the circumference of the wiring flange 5 is the radius of the winding lead wire. In this embodiment, the distance between the circumference of the insulating tray 3 and the circumference of the wiring flange 5 is less than 1 mm, and the insulating The thickness of the insulating tray 3 is less than the distance between the commutator 2 and the rotor core 4. In this embodiment, the thickness of the insulating tray is less than 4 mm. The end face of the insulating tray 3 facing the rotor core 4 and the circumference are in an arc transition. In this embodiment, the arc transition is a chamfer of 2 mm × 45°. The connection between each winding lead wire of the rotor core 4 and the commutator 2 is supported by the insulating tray 3. The insulating tray 3 supports each winding lead wire, thereby preventing the winding lead wire from bending or breaking due to lack of support at the connection between the winding lead wire and the commutator 2.

[0018] Working principle:

[0019] The present invention is located within the starter motor housing. Two sets of brush assemblies are provided on the outer periphery of the commutator 2. A stator assembly is provided on the outer periphery of the rotor core 4, which is mounted on the starter motor housing. The rotor shaft 1 is provided with a lead screw segment, which is connected to a one-way clutch located within the starter motor housing. When power is supplied to the brush assembly, it cooperates with the commutator 2 to conduct current to the windings of the rotor core 4 via the lead wires of the windings on the rotor core 4. The windings of the rotor core 4 are located within the magnetic stator assembly. When current passes through the winding coils of the rotor core 4, the magnetic fields of the rotor and stator interact according to the principle of electromagnetic induction, generating an electromagnetic torque, which causes the rotor to rotate.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A rotor structure for a starter motor, comprising a rotor shaft (1), wherein a rotor core (4) and a commutator (2) are interference-fitted on the rotor shaft (1), and characterized in that: Each winding lead wire on the rotor core (4) is welded to a radial extension portion for welding the lead wire provided at one end of the commutator (2); an insulating tray (3) for supporting the winding lead wire is provided at the axial end of the commutator (2) adjacent to the rotor core (4); the diameter of the insulating tray (3) is smaller than the bottom diameter of the commutator (2); the thickness of the insulating tray (3) is smaller than the distance between the commutator (2) and the rotor core (4); an arc transition is formed between the end surface of the insulating tray (3) facing one end of the rotor core (4) and the circumference; the connection between each winding lead wire of the rotor core (4) and the commutator (2) is supported by the insulating tray (3) to prevent the winding lead wire from bending or breaking.

2. The rotor structure of the starter motor according to claim 1, wherein: The radial extension portion for welding the lead wire is a wire flange (5).

3. The rotor structure of the starter motor according to claim 2, wherein: A plurality of wire embedding grooves are provided on the circumference of the wiring flange, and the winding lead wires are welded in the wire embedding grooves.

4. The rotor structure of the starter motor according to claim 1, wherein: The radial extension portion for welding the lead wire is a hook, and the winding lead wire is welded in the hook.

5. The rotor structure of the starter motor according to claim 1, wherein: The insulating tray (3) is made of thermosetting insulating plastic.

6. The rotor structure of the starter motor according to claim 5, characterized in that: The insulating tray (3) is integrally injection-molded on the insulating sleeve of the commutator (2).

7. The rotor structure of the starter motor according to claim 5, wherein: The insulating tray (3) is fixed on the rotor shaft (1) by interference fit.

8. The rotor structure of the starter motor according to claim 1, wherein: The distance between the circumference of the insulating tray (3) and the circumference of the wiring flange (5) is the radius of the winding lead wire.

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