CN219938054U

CN219938054U - Motor

Info

Publication number: CN219938054U
Application number: CN202321311059.3U
Authority: CN
Inventors: 方绍林
Original assignee: Zhejiang Wanguan Motor Co ltd
Current assignee: Zhejiang Wanguan Motor Co ltd
Priority date: 2023-05-26
Filing date: 2023-05-26
Publication date: 2023-10-31
Anticipated expiration: 2033-05-26

Abstract

An electric machine includes a housing; the rotating shaft is arranged in the shell; the rotor iron core is sleeved on the rotating shaft, N winding grooves are formed in the peripheral surface of the rotor iron core at intervals along the circumferential direction, and each winding groove is axially arranged; the commutator is sleeved on the rotating shaft and is axially spaced from the rotor core; the brush assembly is arranged on the shell and faces the outer peripheral surface of the commutator; the winding group is wound on the rotor iron core, part of the winding group is accommodated in the winding groove, and the end parts of coils in the winding group are electrically connected with the commutator; the motor is characterized in that N is an even number, and the pitch y of the coil is equal to N/2-2, so that starting and running sparks of the motor can be reduced.

Description

Motor

Technical Field

The utility model relates to a power device, in particular to a motor.

Background

An electric machine (English: electric machinery, commonly called a "motor") refers to an electromagnetic device that converts or transmits electric energy according to the law of electromagnetic induction. As a power source for electric appliances or various machines, a motor has a main function of generating a driving torque.

The motor may be classified into a direct current motor and an alternating current motor according to the kind of the working power source. Taking a direct current motor as an example, the direct current motor mainly comprises a shell, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are arranged in the shell, and the rotor assembly comprises a rotating shaft, a rotor iron core and a commutator which are sleeved on the rotating shaft, and a winding group wound on the rotor iron core and the commutator. The commutator is used for converting the direct current passing through the brush into alternating current in the winding or converting the alternating electromotive force in the winding into direct current electromotive force on the brush end.

The pitch of the coil in the prior art is generally higher, so that the counter electromotive force of the coil is higher, and in electric appliances such as electric tools, dust collectors, mowers and the like, the rotating speed of the motor is high, so that sparks are easily generated between the brush and the commutator when the direct current motor is started and operated, and the electromagnetic performance and the service life of the motor are influenced.

Disclosure of Invention

The technical problem to be solved by the present utility model is to provide a motor with small starting and running sparks for the state of the art.

The technical scheme adopted for solving the technical problems is as follows: an electric machine comprising

A housing;

the rotating shaft is arranged in the shell;

the rotor iron core is sleeved on the rotating shaft, N winding grooves are formed in the peripheral surface of the rotor iron core at intervals along the circumferential direction, and each winding groove is axially arranged;

the commutator is sleeved on the rotating shaft and is axially spaced from the rotor core;

the electric brush assembly is arranged on the shell and is contacted with the outer peripheral surface of the commutator;

the winding group is wound on the rotor iron core, part of the winding group is accommodated in the winding groove, and the end parts of coils in the winding group are electrically connected with the commutator;

wherein N is an even number and the pitch y of the coil is N/2-2.

By setting the number N of the winding grooves to be even and setting the pitch y of the coils to be N2-2, the counter electromotive force of the coils can be reduced, sparks are not easy to generate between the brush assembly and the commutator when the motor is started and operated, the electromagnetic performance, the anti-interference performance and the service life of the motor can be improved, and the motor is particularly suitable for being used as a power source of high-rotation-speed light-load electrical appliances such as a weeder, a dust collector, an electric tool and the like. Wherein the units of the number N and the pitch y are each "ones".

Further, N is 12 or 16.

In order to allow the coils to enter and exit the winding grooves conveniently, meanwhile, in order to insulate the winding groups from the inner walls of the winding grooves, openings are formed in one side, adjacent to the outer peripheral surface of the rotor core, of each winding groove, groove paper is contained in each winding groove, each groove paper covers at least part of the corresponding inner wall of the winding groove, and a first notch corresponding to the opening is formed in one side, adjacent to the outer peripheral surface of the rotor core, of each groove paper.

The winding groups are further insulated from the inner walls of the winding grooves, slot wedges are arranged between one side of each winding groove adjacent to the outer peripheral surface of the rotor core and one side of the corresponding slot paper adjacent to the outer peripheral surface of the rotor core, and each slot wedge covers the corresponding opening and the first notch.

In order to avoid the contact between the coil in the winding set and at least one end face of the rotor core, at least one end of each slot paper and/or each slot wedge is/are convexly arranged at the corresponding end part of the rotor core, so that the insulation between the winding set and the inner wall of the winding slot is better.

In order to simplify the forming of the winding groove, the rotor core comprises a center ring and a plurality of tooth parts which are distributed on the periphery of the center ring at intervals along the circumferential direction, each tooth part comprises a flat plate part which extends outwards along the radial direction from the periphery of the center ring and an arc plate part which extends along the circumferential direction, the radially outer side edge of the flat plate part is connected with the inner surface of the arc plate part, and two adjacent tooth parts jointly form one winding groove.

In order to be convenient for contact the commutator with the brush subassembly, simultaneously, in order to connect commutator and coil electricity, the periphery of commutator is equipped with a plurality of commutator segments that contact with the brush subassembly along circumference interval, the quantity of commutator segment is 2N, and each commutator segment all sets up along the axial, and each commutator segment is equipped with the couple of hooking the coil tip near the one end of rotor core.

Further designed, the rotating shaft is also respectively sleeved with an end cover at two ends of the rotor core.

In order to shorten the length of the electric wires of the winding groups, two ends of each winding groove are provided with openings, and the outer peripheral surface of each end cover is provided with a second notch at the opening corresponding to the winding groove.

Further designed, the inside of the shell is also provided with a stator assembly positioned at the periphery of the rotor core, and a gap is reserved between the inner peripheral surface of the stator assembly and the outer peripheral surface of the rotor core.

Compared with the prior art, the utility model has the advantages that: by setting the number N of the winding grooves to be even and setting the pitch y of the coils to be N2-2, the counter electromotive force of the coils can be reduced, sparks are not easy to generate between the brush assembly and the commutator when the motor is started and operated, the electromagnetic performance, the anti-interference performance and the service life of the motor can be improved, and the motor is particularly suitable for being used as a power source of high-rotation-speed light-load electrical appliances such as a weeder, a dust collector, an electric tool and the like.

Drawings

FIG. 1 is a perspective view of an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of an embodiment of the present utility model;

FIG. 3 is a perspective view of a rotor assembly according to an embodiment of the present utility model;

FIG. 4 is an exploded perspective view of a rotor assembly according to an embodiment of the present utility model;

fig. 5 is a winding schematic diagram of a winding set according to an embodiment of the utility model.

Detailed Description

Embodiments of the present utility model are described in further detail below.

As shown in fig. 1 to 5, is a preferred embodiment of the present utility model.

As shown in fig. 2, the motor in the present embodiment includes main components such as a housing 01, a rotor assembly 100, a stator assembly 200, and a brush assembly 04. The rotor assembly 100 is provided inside the stator assembly 200 with a gap between an inner circumferential surface of the stator assembly 200 and an outer circumferential surface of the rotor core 3, thereby allowing the rotor assembly 100 to rotate with respect to the stator assembly 200.

As shown in fig. 3 and 4, the rotor assembly 100 includes a rotating shaft 02, a rotor core 03, a winding group 05, slot paper 06, slot wedge 07, an end cover 08, and a commutator 09. The rotor core 03 comprises a center ring 031 and a plurality of teeth 032 circumferentially spaced around the center ring 031, the rotor core 03 is sleeved on a rotating shaft 02 through a center hole of the center ring 031, each tooth 032 comprises a flat plate portion 0321 extending radially outwards from the outer circumferential surface of the center ring 031 and an arc plate portion 0322 extending circumferentially, the radially outer edge of each flat plate portion 0321 is engaged with the inner surface of the corresponding arc plate portion 0322, and two adjacent teeth 032 jointly form a winding groove 030 axially arranged. The number of the winding grooves 030 is 12.

As shown in fig. 3 and 4, the commutator 09 is fitted around the rotary shaft 2 and is axially spaced from the rotor core 3. The commutator 09 has 24 segments 091 circumferentially spaced apart from each other, each segment 091 is disposed in an axial direction, and two brush assemblies 4 are disposed on the housing 01 in opposition to each other, and an inner surface of each brush assembly 4 contacts an outer surface of the segment 091. Each wire winding groove 030 corresponds to a set of gaps between two adjacent segments 091. One end of each commutator segment 091 adjacent to the rotor core 3 is provided with a hook 0911.

As shown in fig. 3 and 5, the winding group 05 is wound around the rotor core 03 and is partially accommodated in the winding groove 030, and the end portions of the coils 50 in the winding group 05 are each hung on the hanger 0911. Sequentially numbering each commutator segment 091 and each winding groove 030 along the reverse direction of motor steering, taking a hook 0911 with the number of 3 as a starting hook, hanging the end part of a first coil 050 on the hook 0911 with the number of 3, penetrating from the winding groove 030 with the number of 10, penetrating from the winding groove 030 with the number of 6, and hanging from the hook 0911 with the number of 2 to form the end part of a second coil 050; the second coil 050 penetrates from the winding groove 030 with the number 10 and then penetrates from the winding groove 030 with the number 6 until being hung on the hook 0911 with the number 1 to form the end part of the third coil 050; the third coil 050 penetrates … … from the winding groove 030 with the number of 9, and so on, so that the pitch y of the coil 050 is 4, the rest coils are analogized in sequence, the same winding rule is followed, the pitch of the coil 050 in the motor is smaller, the counter electromotive force of the coil 050 can be reduced, the motor can meet the power requirements of high-rotating-speed light-load electric appliances such as a weeder, a dust collector, an electric tool and the like, and sparks are not easy to generate between the brush assembly 04 and the commutator 09 when the motor is started and operated, and the electromagnetic performance, the anti-interference performance and the service life of the motor can be improved.

As shown in fig. 3 and 4, each winding groove 030 is provided with an opening 0301 on a side adjacent to the outer peripheral surface of the rotor core 03, each winding groove 030 accommodates therein a piece of slot paper 06, each slot paper 06 covers at least a part of the inner wall of the corresponding winding groove 030, and each slot paper 06 is provided with a first notch 061 corresponding to the opening 0301 on a side adjacent to the outer peripheral surface of the rotor core 03. A slot wedge 07 is arranged between one side of each winding slot 030 adjacent to the outer peripheral surface of the rotor core 03 and one side of the corresponding slot paper 06 adjacent to the outer peripheral surface of the rotor core 03, and each slot wedge 07 covers the corresponding opening 0301 and the first gap 061. Both ends of each slot paper 06 and each slot wedge 07 are protruded at the corresponding end portion of the rotor core 03.

As shown in fig. 3 and 4, there are two end caps 08 provided at both ends of the rotor core 03, respectively. Each end cover 08 is sleeved on the rotating shaft 02. The two ends of each winding groove 030 are provided with openings, and the outer peripheral surface of each end cover 08 is provided with a second notch 081 at the position corresponding to the opening of the winding groove 030.

Claims

1. An electric machine comprising

A housing (01);

a rotating shaft (02) provided inside the housing (01);

the rotor core (03) is sleeved on the rotating shaft (02), N wire winding grooves (030) are formed in the peripheral surface of the rotor core at intervals along the circumferential direction, and each wire winding groove (030) is axially arranged;

the commutator (09) is sleeved on the rotating shaft (02) and is axially spaced from the rotor core (03);

a brush assembly (04) provided in the housing (01) and contacting the outer peripheral surface of the commutator (09);

the winding group (05) is wound on the rotor iron core (03) and is partially accommodated in the winding groove (030), and the end parts of the coils (050) in the winding group (05) are electrically connected to the commutator (09);

wherein N is an even number and the pitch y=n/2-2 of the coil (050).

2. The electric machine of claim 1, wherein: n is 12 or 16.

3. The electric machine of claim 1, wherein: each winding groove (030) is provided with an opening (0301) at one side adjacent to the outer peripheral surface of the rotor core (03), groove paper (06) is accommodated in each winding groove (030), each groove paper (06) covers at least part of the inner wall of the corresponding winding groove (030), and each groove paper (06) is provided with a first gap (061) corresponding to the opening (0301) at one side adjacent to the outer peripheral surface of the rotor core (03).

4. A motor as claimed in claim 3, wherein: a slot wedge (07) is arranged between one side of each winding slot (030) adjacent to the outer peripheral surface of the rotor core (03) and one side of the corresponding slot paper (06) adjacent to the outer peripheral surface of the rotor core (03), and each slot wedge (07) covers the corresponding opening (0301) and the first gap (061).

5. The electric machine of claim 4, wherein: at least one end of each slot paper (06) and/or each slot wedge (07) is/are convexly arranged at the corresponding end part of the rotor core (03).

6. A motor as claimed in claim 3, wherein: the rotor core (03) comprises a center ring (031) and a plurality of tooth parts (032) distributed on the periphery of the center ring (031) at intervals along the circumferential direction, each tooth part (032) comprises a flat plate part (0321) extending outwards along the radial direction from the peripheral surface of the center ring (031) and an arc-shaped plate part (0322) extending along the circumferential direction, the radial outer side edge of the flat plate part (0321) is connected with the inner surface of the arc-shaped plate part (0322), and two adjacent tooth parts (032) jointly form a winding groove (030).

7. An electric machine according to any one of claims 1-6, characterized in that: the periphery of commutator (09) is equipped with a plurality of commutator segments (091) that contact with brush subassembly (04) along circumference interval, the quantity of commutator segments (091) is 2N, and each commutator segment (091) all sets up along the axial, and each commutator segment (091) all is equipped with couple (0911) of hooking coil (050) tip adjacent one end of rotor core (03).

8. The electric machine of claim 7, wherein: the rotating shaft (02) is also respectively sleeved with an end cover (08) at two ends of the rotor core (03).

9. The electric machine of claim 8, wherein: both ends of each winding groove (030) are provided with openings, and the outer peripheral surface of each end cover (08) is provided with a second notch (081) at the opening corresponding to the winding groove (030).

10. The electric machine of claim 7, wherein: a stator assembly (200) positioned at the periphery of the rotor core (03) is further arranged in the shell (01), and a gap is reserved between the inner peripheral surface of the stator assembly (200) and the outer peripheral surface of the rotor core (03).