A connection structure of a series excited motor, the series excited motor and an electrical appliance

Abstract

The application discloses a wiring structure of a series-excited motor, the series-excited motor and an electrical equipment. The wiring structure comprises at least six excitation windings uniformly and circularly distributed on a stator, an armature winding sleeved on a rotor and two brushes. The at least six excitation windings form at least three N poles and at least three S poles, and the N poles and the S poles are staggered. The at least three excitation windings forming the S poles are connected in parallel to form a first excitation winding assembly of an S pole, and the at least three excitation windings forming the N poles are connected in parallel to form a second excitation winding assembly of an N pole. The first excitation winding assembly and the second excitation winding assembly are connected in series with the armature winding through the two brushes. The application provides the wiring structure of the series-excited motor, the series-excited motor and the electrical equipment, and has the advantages of high load capacity, reduced motor temperature rise and prolonged service life of the motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically to a wiring structure for a series-wound motor, a series-wound motor, and electrical equipment. Background Technology

[0002] Traditional two-pole series motors typically use two excitation windings connected in series with the armature winding, resulting in drawbacks such as high electromagnetic harmonic noise, large carbon brush sparking, low starting torque, and severe noise degradation at low speeds. While some single-phase four-pole series motors have improved torque by using four excitation windings distributed at 90 degrees, they still suffer from excessive temperature rise during actual use, severely impacting the motor's lifespan. Summary of the Invention

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a wiring structure for a series-wound motor, a series-wound motor and electrical equipment, which has strong load capacity, can reduce motor temperature rise and extend motor service life.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a wiring structure of a series motor, the wiring structure including at least six excitation windings uniformly distributed around the stator, an armature winding sleeved on the rotor, and two brushes; At least six excitation windings form at least three N poles and at least three S poles, with the N poles and S poles arranged alternately; the at least three excitation windings forming the S poles are connected in parallel to form a first excitation winding assembly with one S pole, and the at least three excitation windings forming the N poles are connected in parallel to form a second excitation winding assembly with one N pole. The first excitation winding assembly and the second excitation winding assembly are connected in series with the armature winding via two brushes, respectively.

[0005] This technical solution provides a wiring structure for a series-wound motor. By connecting at least three excitation windings constituting the S and N poles in parallel and then in series with the armature winding, it can reduce motor temperature rise, extend motor life, increase motor starting torque, and enhance motor load capacity. Simultaneously, it also has advantages such as lower electromagnetic harmonic noise, reduced brush sparking, slower brush wear, and smaller noise differences between high and low speeds. Furthermore, each of the first and second excitation winding assemblies is connected to a corresponding brush, meaning the series-wound motor requires only two brushes, simplifying the structure and reducing costs.

[0006] In a preferred embodiment, the excitation winding includes a first winding, a second winding, a third winding, a fourth winding, a fifth winding, and a sixth winding, which are evenly distributed around the stator in sequence.

[0007] In a preferred embodiment, the first, third, and fifth windings are S-pole windings, and the second, fourth, and sixth windings are N-pole windings.

[0008] In a preferred embodiment, the two brushes include a first brush and a second brush arranged symmetrically, and the first brush and the second brush are electrically connected to the two ends of the armature winding, respectively.

[0009] In a preferred embodiment, the lead wire of the first brush is electrically connected to one end of the first winding, the third winding, and the fifth winding; the lead wire of the second brush is electrically connected to one end of the second winding, the fourth winding, and the sixth winding.

[0010] In a preferred embodiment, the other ends of the first, third, and fifth windings are electrically connected to the positive terminal of an external power source; one end of the second, fourth, and sixth windings is electrically connected to the negative terminal of an external power source.

[0011] A series-wound motor, comprising the wiring structure of a series-wound motor as described in any of the above technical solutions.

[0012] The series-wound motor in this technology adopts the wiring structure of the aforementioned series-wound motor, resulting in lower motor temperature rise, longer service life, greater starting torque, and stronger load capacity.

[0013] In a preferred embodiment, the rotor includes a shaft, a rotor core mounted on the shaft, and a commutator. An armature winding is mounted on the rotor core, and the commutator is electrically connected to the armature winding. The series-wound motor also includes a mounting bracket with two symmetrically arranged mounting cavities. Two brushes are respectively disposed in the two mounting cavities and make sliding contact with the commutator. This technology facilitates assembly by mounting the brushes in the mounting cavities of the mounting bracket.

[0014] In a preferred embodiment, the mounting cavity is open at both ends, and the inner wall of the mounting cavity is provided with strip-shaped insertion grooves on both sides; the brush is located in the brush box, and the brush box is provided with strip-shaped protrusions on both sides that cooperate with the strip-shaped insertion grooves.

[0015] An electrical device comprising a series-wound motor as described in any of the above technical solutions.

[0016] The electrical equipment in this technology uses the aforementioned series-wound motor, which has advantages such as low motor temperature rise, longer service life, and strong load capacity.

[0017] In addition, other advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a circuit diagram illustrating the wiring structure of the series-wound motor in this invention. Figure 2 This is a schematic diagram of the series-wound motor of the present invention; Figure 3 This is a top view of the series-wound motor of the present invention; Figure 4 This is a schematic diagram of the rotor structure in this invention; Figure 5 This is a schematic diagram of the assembly structure of the mounting bracket and brush box of the present invention; Explanation of reference numerals in the attached drawings: 1. Stator; 11. Excitation winding; 111. First winding; 112. Second winding; 113. Third winding; 114. Fourth winding; 115. Fifth winding; 116. Sixth winding; 2. Rotor; 20. Shaft; 21. Rotor core; 22. Armature winding; 23. Commutator; 3. Brush; 31. First brush; 32. Second brush; 33. Brush box; 331. Strip protrusion; 4. Mounting bracket; 41. Mounting cavity; 411. Strip insertion slot; 100. First excitation winding assembly; 200. Second excitation winding assembly. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0022] Reference Figure 1-5 The present invention describes a wiring structure of a series-wound motor, a series-wound motor, and an electrical device according to an embodiment of the present invention. The wiring structure of the series-wound motor can be applied to a single-phase multi-pole series-wound motor.

[0023] In one embodiment, such as Figure 1-5 As shown, a wiring structure of a series-wound motor includes at least six excitation windings 11 evenly distributed around the stator 1, an armature winding 22 sleeved on the rotor 2, and two brushes 3. At least six excitation windings 11 form at least three N poles and at least three S poles, with the N poles and S poles arranged alternately; the at least three excitation windings 11 forming the S poles are connected in parallel to form a first excitation winding assembly 100 with an S pole, and the at least three excitation windings 11 forming the N poles are connected in parallel to form a second excitation winding assembly 200 with an N pole. The first excitation winding assembly 100 and the second excitation winding assembly 200 are connected in series with the armature winding 22 via two brushes 3, respectively.

[0024] Since the magnetic poles of the motor must exist in pairs, the number of excitation windings 11 must be a positive even number, specifically 4, 6, 8, 10 or more.

[0025] In a preferred embodiment of this invention, the excitation winding 11 includes a first winding 111, a second winding 112, a third winding 113, a fourth winding 114, a fifth winding 115, and a sixth winding 116, which are evenly distributed around the stator 1 in sequence.

[0026] There are six excitation windings 11, which are evenly distributed around the stator core of the stator 1. The three midpoints of the upper side of the first winding 111, the third winding 113 and the fifth winding 115 form an equilateral triangle, and the three midpoints of the upper side of the second winding 112, the fourth winding 114 and the sixth winding 116 form an equilateral triangle. That is, two adjacent excitation windings 11 form an included angle of 60°.

[0027] In one embodiment of this invention, the first winding 111, the third winding 113 and the fifth winding 115 are S-pole windings, and the second winding 112, the fourth winding 114 and the sixth winding 116 are N-pole windings.

[0028] In another embodiment of this invention, the first winding 111, the third winding 113 and the fifth winding 115 can be N-pole windings, and the second winding 112, the fourth winding 114 and the sixth winding 116 can be S-pole windings.

[0029] The two brushes 3 include a first brush 31 and a second brush 32 arranged symmetrically, and the first brush 31 and the second brush 32 are electrically connected to the two ends of the armature winding 22, respectively. Preferably, the first brush 31 and the second brush 32 are at a 180° angle.

[0030] This embodiment provides a wiring structure for a series-wound motor. By connecting at least three excitation windings 11 constituting the S and N poles in parallel and then connecting them in series with the armature winding 22, the motor temperature rise can be reduced, the motor service life extended, and the starting torque and load capacity enhanced. Simultaneously, it also offers advantages such as lower electromagnetic harmonic noise, reduced brush sparking, slower brush wear, and smaller noise differences between high and low speeds. Furthermore, the first excitation winding assembly 100 and the second excitation winding assembly 200 are each connected to a corresponding brush 3, reducing the number of brushes required for the series-wound motor to only two, simplifying the structure and lowering costs.

[0031] Based on the above embodiments, the wiring structure of the series-wound motor is as follows: the lead wire of the first brush 31 is electrically connected to one end of the first winding 111, the third winding 113, and the fifth winding 115; the lead wire of the second brush 32 is electrically connected to one end of the second winding 112, the fourth winding 114, and the sixth winding 116. The other end of the first winding 111, the third winding 113, and the fifth winding 115 is electrically connected to the positive terminal of an external power supply; one end of the second winding 112, the fourth winding 114, and the sixth winding 116 is electrically connected to the negative terminal of an external power supply.

[0032] A second aspect of the present invention provides a series-wound motor, including the wiring structure of the series-wound motor of the first aspect of the present invention. The motor has a lower temperature rise, a longer service life, a larger starting torque, and a stronger load capacity.

[0033] Since this series-wound motor adopts all the technical solutions of the wiring structure of the series-wound motor in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments.

[0034] In one embodiment, the rotor 2 includes a shaft 20, a rotor core 21 sleeved on the shaft 20, and a commutator 23. An armature winding 22 is sleeved on the rotor core 21, and the commutator 23 is electrically connected to the armature winding 22. The series-wound motor also includes a mounting bracket 4, on which two mounting cavities 41 are symmetrically provided. Two brushes 3 are respectively located in the two mounting cavities 41 and slide in contact with the commutator 23.

[0035] The number of mounting cavities 41 is the same as the number of brushes 3, both being two; each brush 3 is correspondingly located within a mounting cavity 41. In specific implementation, the commutator 23 can be composed of multiple insulating copper sheets, directly fixed to the rotating shaft 20 and connected to the armature winding 22, rotating synchronously with the rotor 2, and the brushes 3 make sliding contact with the surface of the commutator 23 to conduct electricity.

[0036] In this embodiment, the brush 3 is installed in the mounting cavity 41 of the mounting bracket 4, which facilitates assembly.

[0037] In one embodiment, the mounting cavity 41 is open at both ends, and the inner wall of the mounting cavity 41 is provided with strip-shaped insertion grooves 411 on both sides; the brush 3 is disposed in the brush box 33, and the brush box 33 is provided with strip-shaped protrusions 331 on both sides that cooperate with the strip-shaped insertion grooves 411.

[0038] The mounting cavity 41 is located on the mounting bracket 4 and is situated outside the commutator 23. In practice, since the strip-shaped protrusions 331 on both sides of the brush box 33 cooperate with the strip-shaped insertion grooves 411 on the inner wall of the mounting cavity 41, the brush box 33 can be installed and fixed by inserting it into the mounting cavity 41 from one end opening. The installation is convenient and the operation is simple. At this time, the brush 3 inside the brush box 33 can extend from the other end opening of the mounting cavity 41 to slide and contact the commutator 23.

[0039] With this configuration, the brush box 33 can be inserted into the mounting cavity 41 and fixed by the strip-shaped insertion groove 411 provided in the mounting cavity 41, which facilitates the installation of the brush 3.

[0040] A third aspect of the present invention provides an electrical device, including a series-wound motor as described in the second aspect of the present invention. The electrical device may be a compressor for an air conditioner and refrigerator, a washing / spinning motor for a washing machine, a ceiling fan and an air circulator, a vacuum cleaner fan, a water pump, or other household appliances.

[0041] Since the electrical equipment adopts all the technical solutions of the series-wound motor in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments.

[0042] The wiring structure of the series-wound motor, other components of the series-wound motor and electrical equipment, and operation according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] In the description of this specification, references to the terms "embodiment," "specific embodiment," "example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example that is included in at least one embodiment or example of the present invention.

[0045] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined with each other in any suitable manner in one or more embodiments or examples without interference or contradiction.

Claims

1. A wiring structure for a series-wound motor, characterized in that: The wiring structure includes at least six excitation windings (11) evenly distributed around the stator (1), an armature winding (22) sleeved on the rotor (2), and two brushes (3); the at least six excitation windings (11) form at least three N poles and at least three S poles, and the N poles and S poles are arranged alternately; At least three excitation windings (11) forming an S pole are connected in parallel to form a first excitation winding assembly (100) of an S pole, and at least three excitation windings (11) forming an N pole are connected in parallel to form a second excitation winding assembly (200) of an N pole; the first excitation winding assembly (100) and the second excitation winding assembly (200) are connected in series with the armature winding (22) through two brushes (3), respectively.

2. The wiring structure of the series-wound motor according to claim 1, characterized in that: The excitation winding (11) includes a first winding (111), a second winding (112), a third winding (113), a fourth winding (114), a fifth winding (115), and a sixth winding (116). The first winding (111), the second winding (112), the third winding (113), the fourth winding (114), the fifth winding (115), and the sixth winding (116) are evenly distributed around the stator (1) in sequence.

3. The wiring structure of the series-wound motor according to claim 2, characterized in that: The first winding (111), the third winding (113) and the fifth winding (115) are S-pole windings, and the second winding (112), the fourth winding (114) and the sixth winding (116) are N-pole windings.

4. The wiring structure of the series-wound motor according to claim 2 or 3, characterized in that: The two brushes (3) include a first brush (31) and a second brush (32) arranged symmetrically, and the first brush (31) and the second brush (32) are electrically connected to the two ends of the armature winding (22).

5. The wiring structure of the series-wound motor according to claim 4, characterized in that: The lead wire of the first brush (31) is electrically connected to one end of the first winding (111), the third winding (113) and the fifth winding (115); the lead wire of the second brush (32) is electrically connected to one end of the second winding (112), the fourth winding (114) and the sixth winding (116).

6. The wiring structure of the series-wound motor according to claim 5, characterized in that: The other end of the first winding (111), the third winding (113) and the fifth winding (115) is electrically connected to the positive terminal of an external power source; one end of the second winding (112), the fourth winding (114) and the sixth winding (116) is electrically connected to the negative terminal of an external power source.

7. A series-wound motor, characterized in that: It includes the wiring structure of a series-wound motor as described in any one of claims 1 to 6.

8. The series-wound motor according to claim 7, characterized in that: The rotor (2) includes a shaft (20), a rotor core (21) sleeved on the shaft (20), and a commutator (23). The armature winding (22) is sleeved on the rotor core (21), and the commutator (23) is electrically connected to the armature winding (22). The series-wound motor also includes a mounting bracket (4), on which two mounting cavities (41) are symmetrically provided. The two brushes (3) are respectively located in the two mounting cavities (41) and slide in contact with the commutator (23).

9. The series-wound motor according to claim 8, characterized in that: The mounting cavity (41) is open at both ends, and the inner wall of the mounting cavity (41) is provided with strip-shaped insertion grooves (411) on both sides; the brush (3) is located in the brush box (33), and the brush box (33) is provided with strip-shaped protrusions (331) on both sides that cooperate with the strip-shaped insertion grooves (411).

10. An electrical appliance, characterized in that: Includes the series-wound motor as described in any one of claims 7 to 9.

Images