CN210075012U

CN210075012U - Induction motor and electric product

Info

Publication number: CN210075012U
Application number: CN201920840052.8U
Authority: CN
Inventors: 马海洋; 陈照明; 蔺江磊
Original assignee: Nico Electric Machinery (qingdao) Co Ltd
Current assignee: Nico Electric Machinery (qingdao) Co Ltd
Priority date: 2019-06-05
Filing date: 2019-06-05
Publication date: 2020-02-14
Anticipated expiration: 2029-06-05

Abstract

The embodiment of the application provides an induction motor and an electric product, wherein the induction motor comprises a rotating body and a non-rotating body, and a magnet is fixed on the rotating body; a hall ic mounted on the non-rotating body within an induction range of the magnet; the Hall integrated circuit is arranged at a position opposite to the magnet and is not in contact with the magnet. The rotating speed detection precision of the induction motor is high, the theoretical speed detection range is from 0RPM to infinity, the input voltage and the output voltage are low, and the induction motor is safe and stable; in addition, the induction motor of the embodiment of the application has the advantages of simple and compact structure, convenience in installation, small required space, simple production process and low cost.

Description

Induction motor and electric product

Technical Field

The present application relates to the field of motors.

Background

The existing motor speed monitoring methods comprise M/T method speed measurement, F/V speed measurement, permanent magnet motor Hall speed measurement, light reflection method speed measurement, electromagnetic coil induction speed measurement, grating method speed measurement and the like. The M/T method for measuring speed belongs to a digital speed measuring method and needs sensors such as a photoelectric pulse encoder, a linear grating ruler, an induction synchronizer, a rotary pressure changer, a linear magnetic grating ruler and the like. The F/V speed measurement is a digital pulse speed measurement mechanism with various principles, and mainly comprises an encoder, an electromagnetic pulse speed measurement machine and the like. The permanent magnet motor Hall velocity measurement is a rotor phase and velocity testing mechanism for permanent magnet brushless motor Hall detection. The speed measurement by the light reflection method is realized by using a light reflection material to describe and stick a motor rotating part and capturing an optical pulse signal through a photoelectric element. The electromagnetic coil induction speed measurement is that a magnet is arranged on a motor rotating body, and a coil is used for outputting a voltage signal to measure speed through magnetic induction.

The speed measuring methods have the defects of high cost, complex speed measuring structure and process, higher component cost and the like if higher reliability and precision are needed, particularly, the speed measuring mechanism of the induction motor of the washing machine is limited by the limitations of the size, cost pressure, large working condition humidity, low working rotating speed (0-1000RPM) and the like of the whole machine, and needs a speed measuring mechanism with low price, safety, reliability and high speed measuring precision, and the speed measuring mechanism can not meet the use requirements.

It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.

SUMMERY OF THE UTILITY MODEL

The inventor finds that the existing solutions commonly adopted by factories are electromagnetic coil induction speed measurement and permanent magnet motor Hall speed measurement.

The electromagnetic coil is used for measuring the speed by induction, namely, a magnet is fixed on a motor rotating structure, and an induction coil is fixed on a motor end cover, the position and the size of the magnet and the motor end cover are fixed, when the motor rotates, the electromagnetic coil outputs a voltage/current signal and converts the voltage/current signal into a rotating speed signal through an integrated circuit, however, the method for detecting the rotating speed of the motor has lower precision, stable and accurate data can be output only when the rotating speed of the motor is larger than 1000RPM, higher-cost coils and magnetic rings are needed for increasing the precision, in addition, the induction coil is large in size and not beneficial to installation and integration.

The permanent magnet motor Hall velocity measurement is a common mode in the current direct current permanent magnet motor, the Hall sensor is used for detecting the rotor phase and detecting the rotating speed signal at the same time, however, the permanent magnet motor Hall velocity measurement is that the motor characteristic of the permanent magnet motor Hall sensor determines that the Hall sensor can output the rotating speed signal when detecting the rotor phase, special requirements are installed on the Hall position and a circuit, the Hall sensor is sealed in the motor, and the installation and use process of the mode cannot meet the requirements of the induction motor on a Hall velocity measurement mechanism.

In order to solve the above-mentioned problems or other similar problems, embodiments of the present application provide an induction motor and an electric product having the induction motor.

According to a first aspect of embodiments of the present application, there is provided an induction motor comprising a rotating body and a non-rotating body, wherein,

a magnet is fixed to the rotating body;

a hall ic mounted on the non-rotating body within a magnetic field induction range of the magnet;

the Hall integrated circuit is arranged at a position opposite to the magnet and is not in contact with the magnet.

In one or some embodiments, the rotating body includes:

a rotating shaft is arranged at the center of the rotating shaft,

a rotor disposed around the rotation shaft;

a bearing part located at least one axial end of the rotating shaft and supporting the rotating shaft to rotate; and

a pulley fixed to the support portion;

the magnet is fixed to at least one of the rotary shaft, the rotor, and the pulley.

In one or some embodiments, the magnet is a magnetic ring, and the magnetic ring is fixed to one axial end of the rotating shaft through a fixing member, or the magnetic ring is clamped to one axial end of the rotating shaft, or the magnetic ring is fixed to one axial end of the rotating shaft in a press-fit manner through interference fit.

In one or some embodiments, the fasteners are rivets, screws, or adhesives.

In one or some embodiments, the non-rotating body comprises:

a stator disposed to be opposed to the rotor in a radial direction;

a housing containing at least a portion of the rotor and the stator, the housing including an end cap; and

the Hall integrated circuit is arranged on the end cover and is contained in the containing box.

In one or some embodiments, a hall position limiting structure is provided in the housing case, the hall position limiting structure being arranged such that a hall element on the hall ic is located within a magnetic induction range of the magnet.

In one or some embodiments, the magnetic induction range is 2 mm.

In one or some embodiments, the hall integrated circuit is a single hall integrated circuit or a multi-hall integrated circuit.

According to a second aspect of embodiments of the present application, there is provided an electrical product having the induction machine of the first aspect described above.

In one or some embodiments, the electrical product further comprises:

the integrated circuit analyzes the induction square wave voltage output by the Hall integrated circuit of the induction motor and outputs a motor rotating speed value of the induction motor; and

and the control circuit controls the rotating speed of the induction motor according to the rotating speed value of the motor.

In one or some embodiments, the electrical product is a washing machine.

One of the beneficial effects of the embodiment of the application lies in: the rotating speed detection precision of the induction motor is high, the theoretical speed detection range is from 0RPM to infinity, the input voltage and the output voltage are low, and the induction motor is safe and stable; in addition, the induction motor of the embodiment of the application has the advantages of simple and compact structure, convenience in installation, small required space, simple production process and low cost.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

Elements and features described in one drawing or one implementation of an embodiment of the application may be combined with elements and features shown in one or more other drawings or implementations. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, and may be used to designate corresponding parts for use in more than one embodiment.

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic view of one embodiment of an induction machine of an embodiment of the present application;

fig. 2 is a schematic view of a storage case of the induction motor according to the embodiment of the present application;

fig. 3 is another schematic view of the storage case of the induction motor according to the embodiment of the present application.

Detailed Description

The foregoing and other features of embodiments of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the following description and drawings, particular embodiments of the present application are disclosed in detail as being indicative of some of the embodiments in which the principles of the embodiments of the application may be employed, it being understood that the embodiments of the application are not limited to the embodiments described, but, on the contrary, the embodiments of the application include all modifications, variations and equivalents falling within the scope of the appended claims.

In the embodiment of the present application, for the convenience of description, a direction parallel to a direction in which the shaft extends is referred to as an "axial direction", a radial direction around the shaft is referred to as a "radial direction", and a direction around the shaft is referred to as a "circumferential direction", but this is for the convenience of description only, and does not limit the orientation of the induction motor in use and manufacture.

Various embodiments of the present application will be described below with reference to the drawings. These embodiments are merely exemplary and are not intended to limit the embodiments of the present application.

Example 1

The embodiment of the application provides an induction motor.

Fig. 1 is a perspective view of an embodiment of an induction motor according to an embodiment of the present application.

As shown in fig. 1, the induction motor has: a rotating body 100 and a non-rotating body 200. The rotating body 100 refers to a member that can rotate during the operation of the induction motor, and may include: the rotary shaft 101, the rotor 102 disposed around the rotary shaft 101, the bearing

portions

107 and 108 located at both ends of the rotary shaft 101 in the axial direction and supporting the rotary shaft 101 to rotate, and the pulley 103 fixed to the rotary shaft 101. The non-rotating body 200 refers to a part that does not rotate with the rotation of the rotating body 100 during the operation of the induction motor, that is, a part that is fixed with respect to the rotating body 100, and may include: a stator 201 disposed radially opposite to the rotor 102, and a casing 202 accommodating the rotor 102 and at least a part of the stator 201, wherein the casing 202 includes an end cover 2021 and a housing case 203 provided on the end cover 2021.

In the embodiment of the present application, as shown in fig. 1, the magnet 105 is fixed to the rotary shaft 101 of the rotary body 100, the hall ic 204 within the sensing range of the magnet 105 is mounted on the non-rotary body 200, and the hall ic 204 may be mounted at a position opposite to the magnet 105 without contact with the magnet 105. Because the tachometer mechanism (between the magnet 105 and the hall ic 204) is non-contact, no noise is generated during the tachometer process.

In one or some embodiments, the hall ic 204 may be radially opposed to the magnet 105, may be axially opposed to the magnet 105, or may be circumferentially opposed to the magnet 105, as long as it is capable of sensing the magnetic signal generated by the magnet 105 within the electromagnetic induction range of the magnet 105.

In one or some embodiments, as shown in fig. 1, the magnet 105 is a magnetic ring, and the magnetic ring is fixed to one axial end of the rotating shaft 101 by a rivet 106, but the embodiment of the present invention is not limited to this, and the magnet 105 may be fixed to one axial end of the rotating shaft 101 by other fixing members, for example, a screw, an adhesive, or the like, or the magnet 105 may be directly engaged with one axial end of the rotating shaft 101 without using a fixing member.

In one embodiment, as shown in fig. 1, the magnet 105 is fixed to the rotating shaft 101, but the present application is not limited thereto, and the magnet 105 may be fixed to another component of the rotating body 100, for example, the rotor 102 or the pulley 103. Therefore, the requirement on the magnet 105 is low, and the installation and fixation are simple, convenient and reliable.

In one embodiment, as shown in fig. 1, the magnet 105 is taken as an example of a magnetic ring, which is not limited in this application, and the magnet 105 may have other shapes or structures.

In one or some embodiments, as shown in fig. 1, the hall ic 204 may be housed in the housing case 203, and the housing case 203 may be made of an insulating material, such as PVC, so that hall failures caused by static electricity during installation and use may be avoided.

In one embodiment, the hall ic 204 can use 5V input voltage, the signal power line and the like can be accommodated in the accommodating box 203 together with the hall ic 204, and since the input voltage (5V) of the hall ic 204 is lower than the safe voltage (48V), the fixing is convenient, and the safety and reliability are high; because hall integrated circuit 204 is integrated to in the holding box 203, small is favorable to the installation, compromises the circuit insulation simultaneously, and motor speed is greater than 0RPM and can exports rotational speed signal, and the low rotational speed detection requirement can be satisfied to this structure, and simple structure is with low costs simultaneously.

Fig. 2 is a schematic view of a storage case of an induction motor according to an embodiment of the present invention, and fig. 3 is another schematic view of the storage case of an induction motor according to an embodiment of the present invention, as shown in fig. 2 and 3, a hall position limiting structure 2031 may be disposed in the storage case 203, and the hall position limiting structure 2031 is disposed such that a hall element H (shown in fig. 3) and a magnet 105 (shown in fig. 1) on a hall ic 204 are located within a magnetic induction range, thereby ensuring an overall installation position of the hall ic 204, and simultaneously limiting a position of the hall element H within a certain size range, so as to avoid a problem that the hall ic 204 and the magnet 105 are too far apart from each other, which may cause that a magnetic signal cannot be correctly sensed to output correct rotational speed data.

In one or some embodiments, the number of the hall elements H disposed on the hall ic 204 is not limited, and may be greater than or equal to 1, that is, the hall ic 204 may be a single hall ic or a multi-hall ic, and when the number of the hall elements H is greater than 1, that is, when the hall ic 204 is a multi-hall ic, the risk of failure of the entire speed measurement system due to failure of a single hall element may be reduced, and the detection accuracy is improved at the same time, but the cost is increased to a certain extent. Regarding the working principle of the hall ic 204, reference may be made to the related art, which is not described herein.

It should be noted that fig. 1 to 3 above only schematically illustrate the induction motor according to the embodiment of the present application, but the present application is not limited thereto, and the details of each structure or component may also refer to the related art; structures or components not shown in fig. 1 to 3 may be added, or one or more structures or components in fig. 1 to 3 may be reduced. Reference may be made to the related art for elements or components not specifically identified in fig. 1 through 3, which should not be construed as limiting the present application.

The rotating speed detection precision of the induction motor is high, the theoretical speed detection range is from 0RPM to infinity, the input voltage and the output voltage are low, and the induction motor is safe and stable; in addition, the induction motor of the embodiment of the application has the advantages of simple and compact structure, convenience in installation, small required space, simple production process and low cost.

Example 2

The embodiment of the present application provides an electrical product, which has the induction motor described in embodiment 1, and the induction motor has the structure of the induction motor described in embodiment 1, and since the structure of the induction motor has been described in embodiment 1, the contents of the induction motor are incorporated herein, and are not described again here.

In the embodiment of the application, the electric product further comprises an integrated circuit and a control circuit, wherein the integrated circuit can analyze the induced square wave voltage output by the Hall integrated circuit and output a motor rotating speed value of the induction motor; the control circuit can control the rotating speed of the induction motor according to the rotating speed value of the motor. The structure of the integrated circuit and the control circuit is not limited in the embodiments of the present application, and reference may be made to related technologies.

In the embodiment of the present application, the electrical product may be any electrical product including an induction motor, such as a washing machine, a vacuum cleaner (sweeper), a refrigerator (compressor), an air conditioner (indoor unit, outdoor unit), a blower, a blender, a vehicle-mounted product such as a power steering system, and the like. Alternatively, the induction motor may be used as an induction motor in various information devices, industrial devices, and the like.

By adopting the structure of the induction motor in the embodiment 1, the electric product in the embodiment of the application improves the rotating speed detection precision of the induction motor, the theoretical speed detection range is from 0RPM to infinity, and the electric product is safe and stable, has low input and output voltages and is suitable for the industrial production; in addition, the structure is simple and compact, the installation is convenient, the required space is small, the production process is simple, and the cost is low.

The present application has been described in conjunction with specific embodiments, but it should be understood by those skilled in the art that these descriptions are intended to be illustrative, and not limiting. Various modifications and adaptations of the present application may occur to those skilled in the art based on the spirit and principles of the application and are within the scope of the application.

Claims

1. An induction motor comprising a rotating body and a non-rotating body,

a magnet is fixed to the rotating body;

a hall ic mounted on the non-rotating body within an induction range of the magnet;

2. The induction motor of claim 1, wherein the rotating body comprises:

a rotating shaft is arranged at the center of the rotating shaft,

a rotor disposed around the rotation shaft;

a pulley fixed to the support portion;

3. The induction motor as claimed in claim 2, wherein the magnet is a magnetic ring, and the magnetic ring is fixed to one axial end of the rotating shaft by a fixing member, or the magnetic ring is engaged with one axial end of the rotating shaft, or the magnetic ring is fixed to one axial end of the rotating shaft by press-fitting in an interference fit manner.

4. An induction machine according to claim 3, characterized in that the fixing elements are rivets, screws or adhesives.

5. The induction motor of claim 2, wherein the non-rotating body comprises:

a stator disposed to be opposed to the rotor in a radial direction;

6. The induction motor according to claim 5, wherein a hall position restricting structure is provided in the housing case, the hall position restricting structure being provided such that a hall element on the hall ic is located within a magnetic induction range of the magnet.

7. An induction machine according to claim 6, characterized in that the magnetic induction range is 2 mm.

8. The induction machine according to any of claims 1-7, wherein the Hall integrated circuit is a single Hall integrated circuit or a multiple Hall integrated circuit.

9. An electrical product, characterized in that the electrical product has an induction machine according to any one of claims 1-8.

10. The electrical product according to claim 9, further comprising: