CN107465279B

CN107465279B - Motor and compressor

Info

Publication number: CN107465279B
Application number: CN201710778317.1A
Authority: CN
Inventors: 徐飞; 乔正忠; 邱小华
Original assignee: Guangdong Meizhi Compressor Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd
Priority date: 2017-08-31
Filing date: 2017-08-31
Publication date: 2023-04-25
Anticipated expiration: 2037-08-31
Also published as: CN107465279A

Abstract

The invention discloses a motor and a compressor, wherein the motor comprises a motor stator and a motor rotor, and the motor stator comprises: the stator core is provided with a plurality of stator convex teeth which are arranged at intervals along the circumferential direction of the stator core, and two adjacent stator convex teeth define a stator slot; the number of the coil groups is multiple, each coil group comprises a plurality of coils wound on the convex teeth of the stator, and each coil group is provided with a wire inlet end and a wire outlet end which are composed of the same number of joints; the number of the motor lead groups is two, each motor lead group is provided with a plurality of motor leads used for connecting joints of the coil groups and a motor control circuit, the total number of the motor leads in each motor lead group is equal to the number of the coil groups, and each motor lead is connected with one wire inlet end or one wire outlet end of one coil group. The invention improves the structure of the motor and improves the working efficiency of the motor.

Description

Motor and compressor

Technical Field

The invention relates to the technical field of compressors, in particular to a motor and a compressor.

Background

In the existing rotary direct-current variable-frequency compressor adopting the permanent magnet motor, the exciting magnetic field of the permanent magnet motor is not adjustable, so that the speed regulation range is smaller, and is usually 30rps-90rps. If the rotating speed of the motor is required to be increased in a strong way, the motor can enter a weak magnetic area, and then the coil current of the motor is increased rapidly, so that the temperature of the coil is increased greatly, insulation aging of a motor wire is caused, and the reliability and the performance of the motor are affected.

In order to avoid the problems, a method is adopted at present to inject negative direct-axis current into a coil assembly of a motor so as to demagnetize a permanent magnet, thereby reducing counter potential and achieving the purpose of expanding the operation range of the motor. However, the method of inputting a negative direct-axis current to the coil of the motor may make the motor operate at a low efficiency at a high frequency.

Disclosure of Invention

The invention mainly aims to provide a motor, which aims to improve the working efficiency of the motor.

In order to achieve the above object, the present invention provides a motor, which includes a motor stator and a motor rotor, the motor stator includes:

the stator core is provided with a plurality of stator convex teeth which are arranged at intervals along the circumferential direction of the stator core, and two adjacent stator convex teeth define a stator slot;

the coil groups comprise a plurality of coils wound on the stator teeth, and each coil group is provided with a wire inlet end and a wire outlet end which are composed of the same number of joints;

and each motor lead group is provided with a plurality of motor leads used for connecting the joints of the coil groups and a motor control circuit, the total number of the motor leads in each motor lead group is equal to the number of the coil groups, and each motor lead is connected with one wire inlet end or one wire outlet end of one coil group.

Preferably, the motor satisfies the relation: 5.18×10 ^-7 ≤T×Di ^-3 ×TPV ^-1 ≤1.17×10 ^-6 Wherein T is the rated torque of the motor, the unit is N.m, di is the minimum inner diameter of the stator core, the unit is mm, TPV is the unit volume torque of the rotor, and the unit is kN.m.m ^-3 And 5 kN.m.m ^-3 ≤TPV≤45kN·m·m ^-3 。

Preferably, the motor stator further comprises a plurality of connectors, and a plurality of motor leads in each motor lead group are connected with the motor control circuit in a plugging mode through at least one connector.

Preferably, the number of the plug connectors is two, and a plurality of motor leads in each motor lead group are plugged with a motor control circuit through one plug connector.

Preferably, the number of the plug connectors corresponds to the number of the motor leads, and the plug connectors are connected with the motor leads in a one-to-one correspondence.

Preferably, each of the coil groups has 2n of the connectors, where n is a positive integer, the 2n of the connectors are divided into n wire-in connectors constituting the wire inlet end and n wire-out connectors constituting the wire outlet end, one of the two connectors is connected to one of the motor leads connected to the n wire-in connectors, and the other is connected to one of the motor leads connected to the n wire-out connectors.

Preferably, the number of the coil groups is 3, and each coil group is provided with one inlet wire connector and one outlet wire connector.

Preferably, the rated rotational speed of the motor is greater than or equal to 6000 rpm.

Preferably, the maximum rotational speed of the motor is greater than or equal to 9000 revolutions per minute.

The invention also provides a compressor, which comprises the motor, wherein the motor comprises a motor stator and a motor rotor, and the motor stator comprises:

According to the invention, each motor lead wire in two groups of motor lead wire groups connected with the motor control circuit and the plurality of coil groups is electrically connected with one connector in one coil group, so that the motor control circuit can be switched into a corresponding coil group wiring mode according to different running conditions of the motor, and the working efficiency of the motor is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic radial structure of an embodiment of a motor stator according to the present invention;

FIG. 2 is a schematic axial view of an embodiment of a stator of an electric motor according to the present invention;

FIG. 3 is a schematic perspective view of an embodiment of a stator of an electric motor according to the present invention;

FIG. 4 is a schematic view of another embodiment of a stator of an electric motor according to the present invention;

fig. 5 is a schematic view showing the structure of an embodiment of the compressor of the present invention.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				10	Motor stator	101	Stator core
20	Motor rotor	101a	Stator slot
				30	Outer casing	101b	Stator convex tooth
31	Accommodating chamber	102	Coil
				40	Crankshaft	102a	Inlet wire joint
50	Cylinder	102b	Outlet connector
				51	Compression chamber	103	Motor lead wire group
60	Piston	103a	Motor lead
				70	Main bearing	104	Plug-in connector
80	Auxiliary bearing	104a	Plug-in connector

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The invention provides a compressor, which is provided with a motor. The motor may be a permanent magnet motor, a three-phase asynchronous motor, or the like, and the embodiment is not limited.

Referring to fig. 1 to 3, the motor includes a motor stator 10 and a motor rotor 20, the motor stator 10 includes a stator core 101 and a plurality of coil groups, the stator core 101 has a plurality of stator teeth 101b arranged at intervals along a circumferential direction thereof, and adjacent two stator teeth 101b define a stator slot 101a; each coil group comprises a plurality of coils 102 wound on the stator teeth 101b, and each coil group has a wire inlet end and a wire outlet end which are composed of the same number of joints.

It will be appreciated that since each coil set has a plurality of coils 102, when the plurality of coils 102 in one coil set are all connected in series, then the coil set has two connectors, with one connector being the inlet end of the coil set and the other being the outlet end; when the plurality of coils 102 in a coil set are not all connected in series, the number of the joints of the coil set is greater than two and even, and the total number of the joints generally forms the wire inlet end of the coil set and the other half forms the wire outlet end.

With continued reference to fig. 1-3, the motor stator 10 further includes two motor lead sets 103, each motor lead set 103 having a plurality of motor leads 103a for connecting a motor control circuit (not shown) and the junctions of the coil sets, wherein the total number of motor leads 103a in each motor lead set 103 is equal to the number of coil sets, and each motor lead 103a is connected to one of the inlet or outlet terminals of one of the coil sets.

It can be appreciated that, since the total number of motor leads 103a in each motor lead group 103 is equal to the number of coil groups, and each motor lead 103a is connected to a terminal formed by one or more connectors of one coil group, the motor control circuit can switch the wiring modes of a plurality of coil groups in the motor according to the working condition of the motor. For example: the motor control circuit controls the mode that the wire inlet ends of the coil groups are connected together or the mode that the wire inlet ends of the coil groups are connected with the appearance ends of the coil groups to switch according to different working frequencies of the motor, so that the working energy efficiency of the motor under high frequency and low frequency is considered.

In this embodiment, in order to make the motor and the compressor better and adapted, the motor may be made to satisfy the formula: 5.18×10 ^-7 ≤T×Di ^-3 ×TPV ^-1 ≤1.17×10 ^-6 Wherein T is rated torque of the motor, and the unit of T is N.m; di is the minimum inner diameter of the stator core 101, that is: as shown in fig. 2, the stator core 101 has a plurality of coresThe diameter of a circle formed by enclosing one end part of each stator tooth 101b towards the central line direction of the stator core 101, wherein Di is in mm; TPV is the torque per unit volume of the rotor 20 in kN.m.m ^-3 And 5 kN.m.m ^-3 ≤TPV≤45kN·m·m ^-3 。

Of course, the above motor can also be used in other fields, depending on the type and size of the motor.

In order to quickly and conveniently connect the motor leads 103a in each motor lead group 103 with the motor control circuit, in this embodiment, the motor stator 10 may further include a plurality of connectors, and the plurality of motor leads 103a in each motor lead group 103 are connected to the motor control circuit by at least one connector.

The plug connector may adopt the plug connector 104 structure shown in fig. 1 to 3, or may adopt the plug connector 104a structure shown in fig. 4. The connector 104 shown in fig. 1 to 3 is a junction box structure, the connector 104 is more suitable for connection to a plurality of motor leads 103a, and the connector 104a shown in fig. 4 is a conductive tab structure, and each connector 104a is more suitable for connection to one motor lead 103 a. Of course, the plug connector may also adopt other structures, and the present embodiment is not limited.

In this embodiment, as shown in fig. 1 to 3, the number of the connectors 104 may be two, and the plurality of motor leads 103a in each motor lead group 103 are connected to the motor control circuit by one connector 104, so as to improve the efficiency of connecting the two motor lead groups 103 to the motor control circuit.

In this embodiment, each coil set has 2n connectors, where n is a positive integer, and the 2n connectors may be divided into n wire inlet connectors 102a forming wire inlet ends and n wire outlet connectors 102b forming wire outlet ends, and one of the two connectors 104 is connected to one motor lead 103a connected to the n wire inlet connectors 102a, and the other connector is connected to one motor lead 103a connected to the n wire outlet connectors 102b, so that connection between the connector of the coil set and the motor control circuit is more convenient.

In this embodiment, the number of coil groups in the motor depends on the model of the motor, for example: the number of the coil groups can be 3, and the coils in each coil group are connected in series, so that each coil group is provided with one inlet wire connector 102a and one outlet wire connector 102b, the structure of the coil group is simplified, and the control effect of the motor control circuit on the motor is improved.

In this embodiment, as shown in fig. 4, the number of connectors 104a may be corresponding to the number of the plurality of motor leads 103a, and the plurality of connectors 104a may be connected to the plurality of motor leads 103a in a one-to-one correspondence manner, so that each motor lead group 103 may be connected to the motor control circuit more flexibly.

Of course, the number of the connectors may be greater than or equal to two and less than or equal to the total number of the motor leads 103a, which is not described herein.

In this embodiment, when the rated operation speed of the motor is 6000 rpm or more, or when the maximum operation speed of the motor is 9000 rpm or more, the efficiency of the motor is improved more by connecting each motor lead 103a of the two motor lead groups 103 to one joint of one coil group.

In this embodiment, as shown in fig. 5, the compressor includes a housing 30, a crankshaft 40, a cylinder 50, a piston 60, a main bearing 70, a sub-bearing 80, and a motor as described above.

Wherein, the shell 30 is provided in a cylindrical shape and has a receiving chamber 31 extending in an axial direction thereof, the crankshaft 40 is provided in the receiving chamber 31 and arranged in an axial direction of the shell 30, a lower end of the crankshaft 40 passes through the cylinder 50, and a portion of the crankshaft 40 extending into the cylinder 50 forms an eccentric portion and is fitted with a piston 60 thereon, the main bearing 70 and the sub-bearing 80 are fitted on the crankshaft 40 from an upper end and a lower end of the crankshaft 40, respectively, and fixedly connected with an upper end and a lower end of the cylinder 50 to seal a compression chamber 51 of the cylinder 50, the motor is provided in the receiving chamber 31 of the shell 30, and a rotor core 20 of the motor is connected with an upper end of the crankshaft 40.

In this embodiment, a connection terminal provided on the inner wall of the housing chamber 31 of the compressor and connected to the control circuit of the motor may be inserted in correspondence with the plug connector of the motor, so that the motor lead wire 103a is electrically connected to the motor control circuit.

In this embodiment, the connection terminal may be a plurality of terminal structures connected to the connector, and the number of the terminals is specifically determined according to the number of the terminals of the plurality of coil groups of the motor. Since the number of windings of the motor generally does not exceed three, each coil assembly has one inlet end and one outlet end, at least six binding posts may be provided on the compressor to enable the compressor to be adapted to more types of motors.

It should be noted that, the total number of the motor leads 103a in the two motor lead groups 103 is equal to twice the number of all the coil groups, so that each motor lead 103a can be connected with a terminal formed by one or more connectors of one coil group, thereby realizing the purpose that the motor control circuit conveniently switches the wiring modes of a plurality of coil groups in the motor according to the working condition of the motor. The manner of electrically connecting the plurality of motor leads 103a to the control circuit is not limited to the above-described embodiment, and other plug-in-like structures may be added for improving the connection efficiency of the motor leads 103a to the motor control circuit, and of course, the present invention is not limited thereto, and may be modified slightly based on the above-described plug-in-structure.

It will be appreciated that since the compressor proposed by the present invention includes all the solutions of all the embodiments of the motor described above, it has at least the same technical effects as the motor described, not set forth herein.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. An electric machine, characterized in that the electric machine comprises a motor stator and a motor rotor, the motor stator comprising:

the motor lead wire groups are provided with a plurality of motor lead wires which are used for connecting joints of the coil groups and a motor control circuit, the total number of the motor lead wires in each motor lead wire group is equal to the number of the coil groups, and each motor lead wire is connected with one wire inlet end or one wire outlet end of one coil group;

the motor satisfies the relation: 5.18×10 ^-7 ≤T×Di ^-3 ×TPV ^-1 ≤1.17×10 ^-6 Wherein T is the rated torque of the motor, the unit is N.m, di is the minimum inner diameter of the stator core, the unit is mm, TPV is the unit volume torque of the rotor, and the unit is kN.m.m ^-3 And 5 kN.m.m ^-3 ≤TPV≤45kN·m·m ^-3 ；

The rated rotation speed of the motor is more than or equal to 6000 revolutions per minute; the maximum rotational speed of the motor is greater than or equal to 9000 revolutions per minute.

2. The motor of claim 1 wherein said motor stator further comprises a plurality of connectors, a plurality of said motor leads in each motor lead set being connected to a motor control circuit by at least one of said connectors.

3. The motor of claim 2 wherein the number of said connectors is two and a plurality of said motor leads in each motor lead set are plugged into the motor control circuit by one of said connectors.

4. The motor of claim 2, wherein the number of connectors corresponds to the number of the plurality of motor leads and is connected in one-to-one correspondence to the plurality of motor leads.

5. A motor as claimed in claim 3, wherein each of said coil sets has 2n of said terminals, where n is a positive integer, and 2n of said terminals are divided into n wire-in terminals constituting said wire inlet terminals and n wire-out terminals constituting said wire outlet terminals, one of the two connectors being connected to one of said motor leads connected to n of said wire-in terminals and the other being connected to one of said motor leads connected to n of said wire-out terminals.

6. The motor of claim 5, wherein the number of coil sets is 3, each coil set having one inlet connection and one outlet connection.

7. A compressor comprising the motor of any one of claims 1 to 6, said compressor being provided with at least six terminals for connection to said motor leads.