WO2022246670A1

WO2022246670A1 - Efficient starter motor capable of quickly achieving dip coating

Info

Publication number: WO2022246670A1
Application number: PCT/CN2021/095896
Authority: WO
Inventors: 蔡乃鑫
Original assignee: 浙江德威电机有限公司
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-12-01

Abstract

An efficient starter motor capable of quickly achieving dip coating, comprising an armature core and an armature coil. A plurality of wiring slots are circumferentially provided on the armature core; the armature coil is in a "U" shape; straight parts at two ends of the armature coil are respectively provided in two wiring slots, and a center angle of the armature core with respect to the two wiring slots is 85° to 95°; an insulating paper is provided between the armature coil and the wiring slots; the insulating paper is in a "C" shape; an opening of the C-shaped insulating paper faces an opening side of the wiring slots; the gap between the insulating paper and the armature coil is filled with insulating paint. The beneficial effects of the present invention are: the insulating paper is in the "C" shape, such that the insulating paint can achieve a filling rate of up to 90% in 5 to 8 seconds, and the density of the insulating paint at all segments is uniform; and when the power of the starter motor is unchanged, torque is improved to a certain extent, and the starting performance of the starter motor is also improved.

Description

Efficient starter motor for quick paint dipping

technical field

The present invention relates to a starter motor, and more particularly, the present invention relates to a starter motor for a heavy-duty vehicle diesel engine.

Background technique

Diesel engines are widely used in heavy-duty vehicles due to their large torque and good economic performance. However, since the viscosity of diesel is higher than that of gasoline, it is not easy to evaporate, so that it cannot be ignited by electric spark, but can only be ignited by cylinder. Therefore, when starting a diesel engine, the starter motor needs to have a strong starting torque. At present, the commonly used method is to install a deceleration mechanism during the power output process of the starter motor to increase the torque, which requires the starter motor to have a higher speed, and the speed of the commonly used starter motor is about 30000rpm. As an important part of the engine, the starter motor is required to have good starting performance, small size, compact structure, less consumables, and reasonable cost. This is also the development direction of the starter motor.

The starter motor in the prior art is shown in Figure 6. Since the insulating paper arranged between the armature coil and the wiring groove is in the shape of an "S", the wires of the armature coil are wrapped in the middle, and the "S"-shaped insulating paper will The opening of the wiring groove is blocked, and the insulating varnish can only penetrate from both ends to the middle, and the process is long, which makes the starter motor take a long time to immerse in the varnish during the varnish immersion process. Generally, it takes more than 1 minute to fill the insulating varnish. The efficiency can only reach about 70% at most (because the insulating varnish at both ends will prevent the subsequent insulating varnish from penetrating into the middle after solidification), and the density of insulating varnish pouring is high at both ends and low in the middle, so the production efficiency is low and the manufacturing cost is high. , the reliability of the armature coil is low.

technical problem

Provided is a high-efficiency starter motor with relatively low manufacturing cost, which can achieve the ultimate output torque without changing the appearance size of the existing starter motor, can be dipped in paint quickly, and has relatively low manufacturing cost.

technical solution

The technical solution of the present invention to solve the existing problems in the prior art is: a high-efficiency starter motor that can be quickly dipped in paint, which includes a casing, and a hollow stator assembly is fixedly connected to the casing, and the stator assembly is equipped with a There is a rotatable rotor assembly, the stator assembly includes an excitation core and an excitation coil wound on the excitation core, the rotor assembly includes an armature core, an armature coil and a commutator, the electric The outer peripheral surface of the armature core is arranged with a plurality of axially extending wiring grooves in the circumferential direction. The armature coil is formed by bending and forming a conductive wire. The armature coil is in the shape of a "U" with one end open and the other end closed. The two ends of the open end of the armature coil are connected to the commutator through the wiring slot, and the straight parts at both ends of the armature coil are respectively arranged in two wiring slots. The central angle of the armature iron core is 85° to 95°. One of the straight parts of the armature coil is located in the wiring slot near the outer side, and the other straight line part of the armature coil is located in the wiring slot near the inner side. Insulating paper is arranged between the armature coil and the wiring groove, the insulating paper is in the shape of "C", the opening of the "C" shaped insulating paper faces the opening side of the wiring groove, and the gap between the insulating paper and the armature coil is filled Insulating paint. Since the insulating paper is in a "C" shape, the opening of the "C"-shaped insulating paper faces the opening side of the wiring groove, so that during the varnish dipping process, the insulating varnish can be poured into the entire wiring section of the wiring groove at the same time, within 5 to 8 seconds A filling rate as high as 90% can be obtained within, and the density of insulating varnish pouring is uniform throughout the section, so that the manufacturing cost of the starter motor of the present invention is low, and the reliability of performance is high. In addition, the opening of the "C"-shaped insulating paper is facing the opening side of the wiring slot, which can also provide space for increasing the diameter of the outer peripheral surface formed by the armature coil, so that the conductive wire of the armature coil can be closer to the outside of the stator assembly. Excitation coil, we know that the closer the distribution of the magnetic force lines generated by the excitation coil is to the excitation coil, the denser the magnetic force lines are, that is to say, when the current of the armature coil remains unchanged and the magnetic field intensity generated by the excitation coil remains unchanged, the armature coil drives the rotor assembly The driving force of the rotation is increased, and the torque is the force multiplied by the force arm. Therefore, the opening of the "C"-shaped insulating paper faces the opening side of the wiring groove, which can increase the torque of the starter motor under the condition that the power supply of the starter motor remains unchanged, thereby lifting the starter motor. startup performance.

As a further technical solution, the cross section of the closed section of the conductive wire of the armature coil is waist-shaped. This can be beneficial to increase the strength of the mechanical properties of the conductive thread against deformation.

As a further technical solution, the conductive wire of the armature coil is twisted by 180° in forming the closed section of the armature coil. This can be beneficial to increase the strength of the mechanical properties of the conductive thread against deformation.

As a further technical solution, a plurality of the wiring grooves are uniformly distributed along the outer peripheral surface of the armature core.

As a further technical solution, an annular reinforcing ring is provided on the armature coil.

Beneficial effect

Since the insulating paper is molded into a "C" shape, and the opening of the "C"-shaped insulating paper faces the opening side of the wiring groove, during the varnish dipping process, the insulating varnish can be poured into the entire wiring section of the wiring groove at the same time, and the process is relatively short. A filling rate of up to 90% can be obtained within 5 to 8 seconds, and the density of insulating varnish pouring is uniform throughout, so that the manufacturing cost of the starter motor of the present invention is low, and the reliability of starting performance is high; at the same time, the armature coil The increased diameter of the formed outer peripheral surface provides a space, so that the conductive wire of the armature coil can be closer to the excitation coil in the stator assembly, which not only increases the force arm of the armature coil to drive the rotor assembly to rotate, but also increases the strength of the armature coil. The coil drives the driving force of the rotor assembly to rotate. When the power of the starter motor remains unchanged, the torque is improved to a certain extent, and the starting performance of the starter motor is also improved.

Description of drawings

Fig. 1 is a schematic structural view of a starter motor in the prior art.

Fig. 2 is a structural schematic diagram of the rotor assembly in the present invention.

Fig. 3 is a structural schematic diagram of the armature coil in the present invention.

Fig. 4 is a schematic cross-sectional view along A-A in Fig. 2 .

FIG. 5 is an enlarged schematic view of part M in FIG. 4 .

Fig. 6 is a structural schematic diagram of insulating paper wrapped conductive wires in the prior art.

Fig. 7 is a schematic cross-sectional view of B-B in Fig. 3 .

In the figure: 1: casing, 2: stator assembly, 3: rotor assembly, 4: excitation core, 5: excitation coil, 6: armature coil, 7: armature shaft, 8: driving gear, 9: Armature core, 10: wiring groove, 11: commutator, 12: reinforcement ring, 13: insulating paper.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

Embodiment: A kind of high-efficiency starter motor that can be quickly dipped in paint, as shown in Figure 1, it includes a casing 1, and a hollow stator assembly 2 is fixedly connected in the casing 1, and a hollow stator assembly 2 is fixed inside the stator assembly 2. There is a rotatable rotor assembly 3, the stator assembly 2 includes an excitation core 4 and an excitation coil 5 wound on the excitation core 4, the rotor assembly 3 includes an armature shaft 7, a hollow armature Iron core 9, armature coil 6, described armature iron core 9 is fixedly sleeved on the outer peripheral side of described armature shaft 7, and one end of described armature shaft 7 is provided on the outside of described armature iron core 9 with Armature shaft 7 is connected as one driving gear 8, and the other end of described armature shaft 7 is provided with commutator 11 outside described armature iron core 9, as shown in Fig. 2, Fig. 3, Fig. 4, described The outer peripheral surface of the armature core 9 is evenly arranged with a plurality of axially extending wiring grooves 10 in the circumferential direction. The armature coil 6 is formed by bending and forming conductive wires. The armature coil 6 is open at one end and closed at the other end. "U" shape, the two ends of the open end of the armature coil 6 pass through the wiring slot 10 and are electrically connected to the commutator 11, and the closed end of the armature coil 6 is located outside the wiring slot 10, in order to strengthen The anti-deformation performance of the closed end of the armature coil 6, the conductive wire is first punched at the middle position of the closed end of the armature coil 6, so that its cross section becomes a waist shape as shown in Figure 3 and Figure 7 and rotates 180 °, so The straight parts at both ends of the armature coil 6 are respectively arranged in two wiring grooves 10, the central angle of the armature core 9 opposite to the two wiring grooves 10 is 85° to 95°, and the armature coil 6 One of the straight parts is located in the wiring groove 10 near the outer side, the other straight part of the armature coil 6 is located in the wiring groove 10 near the inner side, and an insulating paper 13 is arranged between the armature coil 6 and the wiring groove 10 , as shown in Figure 5, the insulating paper 13 is in the shape of a "C", the opening of the "C" shaped insulating paper 13 faces the opening side of the wiring groove 10, and the gap between the insulating paper 13 and the armature coil 6 is filled Insulating paint.

The starter motor of a heavy-duty vehicle diesel engine has high requirements on its starting performance, and the starting torque of the starter motor is the most important indicator of the starting performance. The starter motor in the prior art is shown in Figure 1, due to the high rotational speed of the starter motor, the armature coil 6 part located outside the two ends of the armature core 9, its mechanical performance strength is difficult to overcome the effect of centrifugal force, and tends to The outer deformation and bulge, thus touching the excitation coil 5 located on the outside, when the insulating varnish between the excitation coil 5 and the armature coil 6 is conductive due to scratch damage, the starter motor will be burned, in order to ensure the normal operation of the armature The reliability of use, so the armature coil 6 is located at the outer parts of the two ends of the armature core 9 and it is necessary to cover the outer peripheral surface with an annular reinforcement ring 12 to overcome the centrifugal force generated by high-speed rotation. Due to the existence of the annular reinforcing ring 12, the outer diameter formed by the armature coil 6 shrinks inwardly. We know that the torque is equal to the force multiplied by the moment arm, so the output torque of the starter motor is difficult to reach the limit.

The inventors found that the mechanical strength of individual steel bars and concrete is not great, but the comprehensive mechanical performance and strength of the steel bars can be greatly improved when the steel bars are placed in the concrete in a certain structural form. Inspired by reinforced concrete, the annular reinforcing ring 12 is placed into the closed end of the armature coil 6 , and the closed end of the armature coil 6 is filled with insulating varnish on the outer peripheral side of the reinforcing ring 12 . Because the annular reinforcing ring 12 is located in the closed end of the armature coil 6, the closed end of the armature coil 6 and the reinforcing ring 12 are connected by insulating varnish filling the gap between the annular reinforcing ring 12 and the armature coil 6. Formed into an organic whole, the reinforcement ring 12 and the insulating varnish can firmly fix the closed end of the armature coil 6 so that it will not be deformed under the strong centrifugal force when it rotates at high speed. Since the reinforcing ring 12 is built-in, it provides space for increasing the diameter of the outer peripheral surface formed by the armature coil 6, and the conductive wire of the armature coil 6 can be closer to the excitation coil 5 in the stator assembly 2 outwards. The thickness of the annular reinforcing ring 12 Generally between 1.5mm and 2mm, so that the inner and outer layers of the conductive wire of the armature coil 6 can be moved outward by 1.5mm to 2mm, and the diameter of the inner and outer peripheral surfaces formed by the armature coil 6 increases by 3mm to 4mm, that is to say, the armature coil 6 The force arm that drives the rotor assembly 3 to rotate has increased by 3mm to 4mm, and at the same time, the conductive wire of the armature coil 6 is closer to the excitation coil 5 by 1.5mm to 2mm. The denser it is, that is to say, when the current of the armature coil 6 remains unchanged and the strength of the magnetic field generated by the exciting coil 5 remains unchanged, the driving force for the armature coil 6 to drive the rotor assembly 3 to rotate increases, and the torque is the force multiplied by the force Therefore, the built-in reinforcing ring 12 can greatly increase the torque of the starter motor under the condition of constant power supply, and the starting performance of the starter motor can also be greatly improved.

The diameter of the outer peripheral surface formed by the plurality of armature coils 6 arranged in the plurality of wiring slots 10 of the armature core 9 is smaller than the outer diameter of the armature core 9, and the diameter difference between the two is less than 3mm; further Technical solution, the diameter of the outer peripheral surface formed by the plurality of armature coils 6 arranged in the plurality of wiring slots 10 of the armature core 9 is smaller than the outer diameter of the armature core 9, and the difference between the two diameters is less than 0.5 mm.

The embodiment described above is only a preferred solution of the present invention, and does not limit the present invention in any form, and there are other variations and modifications on the premise of not exceeding the technical solution described in the claims.

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims

A high-efficiency starter motor that can be quickly dipped in paint, which includes a casing, a hollow stator assembly is fixedly connected inside the casing, a rotatable rotor assembly is arranged inside the stator assembly, and the stator assembly It includes an excitation core and an excitation coil wound on the excitation core. The rotor assembly includes an armature core, an armature coil and a commutator. A plurality of shafts are circumferentially arranged on the outer peripheral surface of the armature core. The armature coil is formed by bending and forming a conductive wire. The armature coil is in the shape of a "U" with one end open and one end closed. The two ends of the armature coil open end pass through the The wiring groove is connected with the commutator, and the straight parts at both ends of the armature coil are respectively arranged in two wiring grooves. One of the straight parts of the armature coil is located in the wiring groove near the outer side, and the other straight part of the armature coil is located in the wiring groove near the inner side. An insulating paper is arranged between the armature coil and the wiring groove. The feature is that the insulating paper is in a "C" shape, the opening of the "C" shaped insulating paper faces the opening side of the wiring groove, and the gap between the insulating paper and the armature coil is filled with insulating varnish.
The high-efficiency starter motor that can be quickly dipped in paint according to claim 1 is characterized in that the cross section of the closed section of the conductive wire of the armature coil is waist-shaped.
The high-efficiency starter motor that can be rapidly impregnated with paint according to claim 2, wherein the conductive wire of the armature coil is twisted by 180° when forming the closed section of the armature coil.
The high-efficiency starter motor that can be rapidly impregnated with paint according to any one of claims 1 to 3 is characterized in that the plurality of wiring grooves are evenly distributed along the outer peripheral surface of the armature core.
The high-efficiency starter motor that can be quickly dipped in paint according to any one of claims 1 to 3 is characterized in that a ring-shaped reinforcing ring is provided on the armature coil.