CN218995600U

CN218995600U - Motor detection device

Info

Publication number: CN218995600U
Application number: CN202221003235.2U
Authority: CN
Inventors: 庞建梁; 杨伟明; 陈乐民; 庞嘉欣
Original assignee: Foshan Huakong Motor Technology Co ltd
Current assignee: Foshan Huakong Motor Technology Co ltd
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2023-05-09
Anticipated expiration: 2032-04-27

Abstract

The utility model discloses a motor detection device, which is used for detecting the working state of a direct current brushless motor, and comprises the following components: the rotary table is provided with an inner ring area, an outer ring area and a mounting hole, and a first magnetic belt is arranged on an annular belt of the inner ring area and is formed by alternately a first N pole magnetic area and a first S pole magnetic area; the annular belt of the outer ring zone is provided with a second magnetic belt which is formed by alternately arranging a second N pole magnetic zone and a second S pole magnetic zone; the mounting hole is positioned at the central position of the turntable and is used for being connected with the tail end of the rotating shaft of the motor; the sensing detection module is used for detecting magnetic field changes of the first N pole magnetic region and the first S pole magnetic region to obtain a first magnetic field change; and the magnetic field sensor is also used for detecting the magnetic field changes of the second N pole magnetic region and the second S pole magnetic region to obtain a second magnetic field change. The utility model is externally arranged on the motor, reduces the influence of high temperature, high pressure and strong magnetic environment on the sensing detection module, and effectively improves the detection accuracy of the phase and the rotation speed of the rotating part of the motor.

Description

Motor detection device

Technical Field

The utility model relates to the technical field of motor detection, in particular to a motor detection device.

Background

The direct current brushless motor (Brushless Direct Current Motor, BLDC) is a trapezoidal wave motor or a square wave motor with series excited direct current motor starting characteristic and shunt excited direct current motor speed regulation characteristic, the basic structure of the motor is composed of a motor body, a power driving circuit and a position sensor, and the stator part of the motor is a coil, also called a winding; the rotor part of the motor is a permanent magnet. The rotation principle of the brushless DC motor is that the power driving circuit is utilized to control the energization of each coil according to the position of the rotor, so that the coils generate magnetic field change, and the rotor is driven to rotate continuously.

In general, a hall sensor is built in a direct current brushless motor, and the phase and the magnetic pole polarity of a motor rotor are judged and controlled through the feedback of the hall sensor. The Hall sensor is manufactured according to the Hall effect principle, the existing built-in mounting mode enables the Hall sensor to be in a high-temperature, high-voltage or strong-magnetic working environment for a long time, the sensitivity of a Hall element in the Hall sensor is reduced or damaged, and therefore the rotor phase and the magnetic pole measuring result are inaccurate.

Disclosure of Invention

The present utility model is directed to a motor detection device, which solves one or more of the technical problems of the prior art, and at least provides a beneficial choice or creation condition.

The utility model solves the technical problems as follows: there is provided a motor detection apparatus for detecting an operation state of a dc brushless motor, including: the rotary table is provided with an inner ring area, an outer ring area and a mounting hole, a first magnetic belt is arranged on an annular belt of the inner ring area, a second magnetic belt is arranged on an annular belt of the outer ring area, the mounting hole is positioned at the central position of the rotary table, and the mounting hole is used for being connected with the tail end of a rotating shaft of the motor; the inner ring zone is arranged around the mounting hole, and the outer ring zone is arranged around the inner ring zone; the first magnetic belt is formed by alternately first N-pole magnetic areas and first S-pole magnetic areas, and the number of the first N-pole magnetic areas is the same as that of the first S-pole magnetic areas; the second magnetic belt is formed by alternately second N-pole magnetic areas and second S-pole magnetic areas, and the number of the second N-pole magnetic areas and the number of the second S-pole magnetic areas are the same;

the sensing detection module is used for detecting magnetic field changes of the first N pole magnetic region and the first S pole magnetic region to obtain a first magnetic field change; and the magnetic field sensor is also used for detecting the magnetic field changes of the second N pole magnetic region and the second S pole magnetic region to obtain a second magnetic field change.

Further, the number of the first N pole magnetic region and the first S pole magnetic region is two.

Further, the number of the second N pole magnetic regions and the second S pole magnetic regions is eight.

Further, the surface of the turntable is coated with paint.

Further, the first N pole magnetic region and the first S pole magnetic region are respectively composed of a plurality of first cylindrical magnets, and the first cylindrical magnets are riveted on the inner ring region of the turntable; the magnetism of one end, far away from the motor, of the first cylindrical magnet of the first N pole magnetic region is N pole, and the magnetism of one end, far away from the motor, of the first cylindrical magnet of the first S pole magnetic region is S pole.

Further, the second N pole magnetic region and the second S pole magnetic region are respectively composed of a plurality of second cylindrical magnets, and the second cylindrical magnets are riveted on an outer ring region of the turntable; the magnetism of one end, far away from the motor, of the second cylindrical magnet in the second N-pole magnetic region is N pole, and the magnetism of one end, far away from the motor, of the second cylindrical magnet in the second S-pole magnetic region is S pole.

Further, the first cylindrical magnet and the second cylindrical magnet are both made of permanent magnets.

Further, the first S-pole magnetic region corresponds to an S-pole magnetic region of a rotating portion of the motor, and the first N-pole magnetic region corresponds to an N-pole magnetic region of the rotating portion of the motor.

Further, the surface of the sensing detection module is coated with electronic potting silica gel.

The beneficial effects of the utility model are as follows: a motor detection device is provided, and is connected with the tail end of a rotating shaft of a motor through a mounting hole and is arranged outside the motor. The utility model reduces the influence of high temperature, high pressure and strong magnetic environment on the sensing detection module, effectively improves the detection accuracy of the phase and the rotating speed of the rotating part of the motor, and prolongs the service life of the sensing detection module.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings described are only some embodiments of the utility model, but not all embodiments, and that other designs and drawings can be obtained from these drawings by a person skilled in the art without inventive effort.

FIG. 1 is a schematic diagram of a motor detection device;

fig. 2 is a schematic diagram of magnetic field distribution in an inner ring region and an outer ring region of a motor detection device.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It should be noted that although functional block diagrams are depicted as block diagrams, and logical sequences are shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the block diagrams in the system. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The embodiment of the application discloses a motor detection device, take quadrupole brushless motor as the example to explain and describe, refer to fig. 1 and fig. 2, in this application embodiment, a motor detection device for detect brushless motor's operating condition, include: the rotary table 100 is provided with an inner ring area, an outer ring area and a mounting hole 130, wherein a first magnetic belt 110 is arranged on an annular belt of the inner ring area, a second magnetic belt 120 is arranged on an annular belt of the outer ring area, the mounting hole 130 is positioned at the central position of the rotary table 100, and the mounting hole 130 is used for being connected with the tail end of a rotating shaft of a motor; the inner ring region is disposed about the mounting hole 130 and the outer ring region is disposed about the inner ring region; the first magnetic stripe 110 is formed by alternately first N-pole magnetic regions 111 and first S-pole magnetic regions 112, and the number of the first N-pole magnetic regions 111 and the number of the first S-pole magnetic regions 112 are the same; the second magnetic stripe 120 is formed by alternately second N-pole magnetic regions 121 and second S-pole magnetic regions 122, and the number of the second N-pole magnetic regions 121 and the second S-pole magnetic regions 122 is the same;

the sensing detection module 200 is configured to detect magnetic field changes of the first N-pole magnetic region 111 and the first S-pole magnetic region 112, so as to obtain a first magnetic field change; and is further configured to detect a magnetic field change of the second N-pole magnetic region 121 and the second S-pole magnetic region 122, thereby obtaining a second magnetic field change.

In this embodiment of the application, a process and principle for detecting a motor state by using a motor detection device are as follows:

the motor detection device is applied to a dc brushless motor, and a four-pole dc brushless motor will be described as an example.

The general DC brushless motor comprises a stator, a rotor, a control module, a plurality of power transistors and a driver, wherein the control module controls the on or off of the power transistors so as to change the rotation state of the rotor. The turntable 100 is installed outside the motor through the rotating shaft of the motor by the installation hole 130, the inner ring region thereof is aligned with the rotating part of the motor, the first S pole magnetic region 112 thereof corresponds to the S pole magnetic region of the rotating part of the motor, and the first N pole magnetic region 111 thereof corresponds to the N pole magnetic region of the rotating part of the motor.

When the motor is started, the rotating part of the motor rotates, and the sensing detection module 200 detects the magnetic field changes of the first N pole magnetic region 111 and the first S pole magnetic region 112, so as to obtain a first magnetic field change and output the first magnetic field change to a control system of the motor; the first magnetic field variation reflects a phase variation of the motor. The sensing detection module 200 detects the magnetic field changes of the second N pole magnetic region 121 and the second S pole magnetic region 122, obtains a second magnetic field change, and outputs the second magnetic field change to the control system of the motor, wherein the second magnetic field change reflects the rotating speed of the motor. The control system of the motor acquires the first magnetic field change and the second magnetic field change and processes the first magnetic field change and the second magnetic field change: the first magnetic field change and the second magnetic field change are pulse signals.

Taking a motor with a coil as N lines as an example, a control system of the motor acquires the first magnetic field change and the second magnetic field change from the sensing detection module 200 every t seconds, and the number of pulse signals of the first magnetic field change in the t seconds is

The number of pulse signals of the second magnetic field variation is +.>

The rotating speed information and the phase information of the motor can be obtained:

wherein v is the rotational speed of the motor;

the phase information of the motor is determined according to the polarity of the rotor of the motor and the number of pulse signals of the first magnetic field variation.

Further as a preferred embodiment, the number of the first N pole magnetic regions 111 and the number of the first S pole magnetic regions 112 are two.

Further as a preferred embodiment, the number of the second N pole magnetic regions 121 and the second S pole magnetic regions 122 is eight.

As a preferred embodiment, the number of the first N pole magnetic region 111 and the first S pole magnetic region 112 is J, and J is preferably 2. In other embodiments of the present application, J may take other positive even values, where the value of J depends on the number of poles of the dc brushless motor. For example, when the motor detecting device is applied to a six-pole brushless direct current motor, the number of poles of the motor is 6, and then J is preferably 3; when the motor detection device is applied to an eight-phase direct current brushless motor, the number of poles of the motor is 8, and J is preferably 8.

As a preferred embodiment, the number of the second N pole magnetic regions 121 and the second S pole magnetic regions 122 is K, and K is preferably 8. In this embodiment of the present application, K may take other positive integer values, where the greater the value of K, the higher the accuracy of detection by the motor detection device.

Further as a preferred embodiment, the first N pole magnetic region 111 and the first S pole magnetic region 112 are each formed by a plurality of first cylindrical magnets, and the first cylindrical magnets are riveted to the inner ring region of the turntable 100. The first cylindrical magnet of the first N-pole magnetic region 111 has a magnetic property of N-pole at the end far from the motor, and the first cylindrical magnet of the first S-pole magnetic region 112 has a magnetic property of S-pole at the end far from the motor.

Further as a preferred embodiment, the second N pole magnetic region 121 and the second S pole magnetic region 122 are each formed by a plurality of second cylindrical magnets, and the second cylindrical magnets are riveted to the outer ring region of the turntable 100. The second cylindrical magnet of the second N-pole magnetic region 121 has a magnetic property of N-pole at the end far from the motor, and the second cylindrical magnet of the second S-pole magnetic region 122 has a magnetic property of S-pole at the end far from the motor.

In a further preferred embodiment, the first cylindrical magnet and the second cylindrical magnet are both permanent magnets.

Further as a preferred embodiment, the surface of the turntable 100 is painted. In this embodiment, since the turntable 100 is connected to the end of the rotating shaft of the motor through the mounting hole 130, the turntable 100 is easily affected by external environments such as moisture, etc., the first and second cylindrical magnets are easily corroded and rusted, the surface of the turntable 100 is coated with paint, which protects the turntable 100 from oxygen and moisture in the air to prevent the turntable, the first and second cylindrical magnets from rusting.

Further as a preferred embodiment, the surface of the sensing detection module 200 is coated with an electronic encapsulation silica gel, when the turntable 100 is external, the sensing detection module 200 is easily affected by external environments such as humidity and dust, and the electronic encapsulation silica gel protects and seals the sensing detection module 200, so that the influence of the external humidity and dust on the sensing detection module 200 can be effectively reduced.

While the preferred embodiments of the present utility model have been illustrated and described, the present utility model is not limited to the embodiments, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present utility model, and these are intended to be included within the scope of the present utility model as defined in the appended claims.

Claims

1. A motor detection apparatus for detecting an operation state of a dc brushless motor, comprising: the rotary table is provided with an inner ring area, an outer ring area and a mounting hole, a first magnetic belt is arranged on an annular belt of the inner ring area, a second magnetic belt is arranged on an annular belt of the outer ring area, the mounting hole is positioned at the central position of the rotary table, and the mounting hole is used for being connected with the tail end of a rotating shaft of the motor; the inner ring zone is arranged around the mounting hole, and the outer ring zone is arranged around the inner ring zone; the first magnetic belt is formed by alternately first N-pole magnetic areas and first S-pole magnetic areas, and the number of the first N-pole magnetic areas is the same as that of the first S-pole magnetic areas; the second magnetic belt is formed by alternately second N-pole magnetic areas and second S-pole magnetic areas, and the number of the second N-pole magnetic areas and the number of the second S-pole magnetic areas are the same;

2. The motor testing device of claim 1, wherein the number of said first N pole magnetic regions and said first S pole magnetic regions is two.

3. The motor testing device of claim 1, wherein the number of said second N pole magnetic regions and second S pole magnetic regions is eight.

4. A motor testing device according to claim 1, wherein the surface of the turntable is painted.

5. The motor detection device according to claim 1, wherein the first N pole magnetic region and the first S pole magnetic region are each composed of a plurality of first cylindrical magnets, and the first cylindrical magnets are riveted on an inner ring region of the turntable; the magnetism of one end, far away from the motor, of the first cylindrical magnet of the first N pole magnetic region is N pole, and the magnetism of one end, far away from the motor, of the first cylindrical magnet of the first S pole magnetic region is S pole.

6. The motor detection device according to claim 5, wherein the second N pole magnetic region and the second S pole magnetic region are each composed of a plurality of second cylindrical magnets, and the second cylindrical magnets are riveted on the outer ring region of the turntable; the magnetism of one end, far away from the motor, of the second cylindrical magnet in the second N-pole magnetic region is N pole, and the magnetism of one end, far away from the motor, of the second cylindrical magnet in the second S-pole magnetic region is S pole.

7. The motor testing device of claim 6, wherein the first cylindrical magnet and the second cylindrical magnet are both permanent magnets.

8. The motor detection apparatus according to claim 1, wherein the first S-pole magnetic region corresponds to an S-pole magnetic region of a rotating portion of the motor, and the first N-pole magnetic region corresponds to an N-pole magnetic region of the rotating portion of the motor.

9. The motor detection device of claim 1, wherein the surface of the sensing detection module is coated with electronic potting silica gel.