CN215866768U

CN215866768U - Device for detecting rotation direction of motor

Info

Publication number: CN215866768U
Application number: CN202121562051.5U
Authority: CN
Inventors: 刘宇航; 牛根艺; 赵跃东; 胡述静; 赵倩倩; 曾宽; 张舒窈
Original assignee: Wolong Electric Shanghai Central Research Institute Co ltd; Zhejiang Longchuang Motor Technology Innovation Co ltd; Wolong Electric Group Co Ltd
Current assignee: Zhejiang Shunyun Internet Technology Co ltd; Wolong Electric Drive Group Co Ltd
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2022-02-18
Anticipated expiration: 2031-07-09

Abstract

The utility model discloses a device for detecting the rotation direction of a motor, which relates to the technical field of detection equipment and comprises a plurality of weak magnetic sensors and a controller connected with the weak magnetic sensors, wherein the weak magnetic sensors are distributed along the circumferential tangential direction of the motor and are used for collecting magnetic leakage signals of the motor, and the controller is used for receiving the magnetic leakage signals transmitted by the weak magnetic sensors and judging the rotation direction of the motor. The device can measure in real time in the normal operation process of the motor, does not need to physically contact a rotating part, does not need to weld or paste marks such as a reflector on the rotating part, can be used for measuring the non-invasive rotation direction of the motor, has the characteristics of simple structure, low cost, wide application range and the like, can be directly used in the non-exposed occasions where the motor and a pump body are integrated, and can also be applied to the steering judgment of the running motor or the testing occasions where accessories such as a magnetizer, a rotary encoder and the like cannot be installed.

Description

Device for detecting rotation direction of motor

Technical Field

The utility model relates to the technical field of detection equipment, in particular to a device for detecting the rotation direction of a motor.

Background

The steering measuring device generally adopts a photoelectric type, a proximity switch or a rotary encoder, but the methods are only suitable for a measured object with an exposed rotating part, because a photosensitive sheet, a magnetizer or a grating disc of the photoelectric type tachometer, the proximity switch or the rotary encoder must be arranged on the rotating part and keeps synchronous rotation with the rotating part, before a submersible pump motor or an electric submersible pump and the like leave a factory, the motor and a pump body are assembled into a whole, and the rotating part without the exposure cannot measure the rotating speed.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The utility model provides a device for detecting the rotation direction of a motor, aiming at the technical problem that the rotation speed cannot be measured without an exposed rotating part, the device can be used for measuring the rotation direction of the motor in real time in the normal operation process of the motor without physically contacting the rotating part or welding or pasting marks such as a reflector on the rotating part, and can be used for measuring the non-invasive rotation direction of the motor.

2. Technical scheme

In order to solve the problems, the technical scheme provided by the utility model is as follows: the utility model provides a detect device of motor direction of rotation, includes a plurality of weak magnetic sensors and the controller of being connected with weak magnetic sensor, and is a plurality of weak magnetic sensor distributes along the circumference tangential direction of motor, weak magnetic sensor is used for gathering the magnetic leakage signal of motor, the controller is used for receiving the magnetic leakage signal of weak magnetic sensor transmission and judges motor direction of rotation.

Optionally, the weak magnetic sensor is used for measuring low-frequency and direct-current magnetic field signals.

Optionally, the number of the weak magnetic sensors is two, and the weak magnetic sensors are respectively a first sensor and a second sensor, and the first sensor and the second sensor are distributed along the circumferential tangential direction of the motor.

Optionally, the magnetic field weakening sensor, the signal amplification circuit and the controller are connected in sequence.

Optionally, the weak magnetic sensor is a magnetoresistive sensor.

Optionally, the controller is connected with a display unit.

Optionally, the controller is connected with a storage unit.

Optionally, the controller is a single chip microcomputer.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

(1) the device for detecting the rotation direction of the motor provided by the embodiment of the application utilizes the weak magnetic sensor array to measure the magnetic leakage of the motor, then transmits a plurality of signals to the controller, the controller calculates the intensity, the frequency and the phase of the magnetic leakage field, the synchronous rotating speed of the motor can be obtained by the voltage frequency of the stator, and the rotation direction of the motor can be obtained by the arrangement position relationship between the phase signals and the weak magnetic sensor. The utility model can measure in real time in the normal operation process of the motor, does not need to physically contact the rotating part, does not need to weld or paste marks such as a reflector on the rotating part, can be used for measuring the non-invasive rotation direction of the motor, has the characteristics of simple structure, low cost, wide application range and the like, can be directly used in the non-exposed occasions where the motor and the pump body are integrated, and can also be applied to the steering judgment of the running motor or the testing occasions where accessories such as a magnetizer, a rotary encoder and the like cannot be installed.

(2) According to the device for detecting the rotating direction of the motor, the weak magnetic sensor can measure low-frequency and direct-current magnetic field signals, and the synchronous rotating speed of the motor can be measured in the extremely-low speed state and the zero-speed maintaining state of the motor by the weak magnetic sensor.

Drawings

Fig. 1 is a leakage flux schematic diagram of a radial cross section of a motor according to an embodiment of the present invention.

Fig. 2 is a schematic block diagram of an apparatus for detecting a rotation direction of a motor according to an embodiment of the present invention.

Fig. 3 is a schematic view of a device for detecting a rotation direction of a motor according to an embodiment of the present invention, which is mounted on the motor.

Fig. 4 is a schematic diagram of a signal sampling and determining method of the apparatus for detecting a rotation direction of a motor according to an embodiment of the present invention.

The labels in the various figures are: 1. a weak magnetic sensor; 11. a first sensor; 12. a second sensor; 2. a controller; 3. a motor; 31. a rotating shaft; A. axial direction; B. radial direction; C. tangential.

Detailed Description

For a further understanding of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings.

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The terms first, second, and the like in the present invention are provided for convenience of describing the technical solution of the present invention, and have no specific limiting effect, but are all generic terms, and do not limit the technical solution of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the same embodiment and the technical solutions in different embodiments can be arranged and combined to form a new technical solution without contradiction or conflict, and the technical solutions are within the scope of the present invention.

Example 1

Combine attached 1-4, the device of detection motor 3 direction of rotation of this embodiment, its characterized in that includes a plurality of weak magnetic sensor 1 and the controller 2 of being connected with weak magnetic sensor 1, and is a plurality of weak magnetic sensor 1 distributes along the circumference tangential direction of motor 3, weak magnetic sensor 1 is used for gathering motor 3's magnetic leakage signal, controller 2 is used for receiving the magnetic leakage signal of weak magnetic sensor 1 transmission and judges motor 3 direction of rotation.

As long as the concepts of "axial", "radial" and "tangential" are used in the following, reference is always made to the rotating shaft 31. The "axial direction" is a direction parallel to the rotation axis 31. "radial" is a direction normal to the axis of rotation 31 and toward or away from the axis of rotation 31. "tangential" is a direction that is orthogonal not only with respect to the axial direction a, but also with respect to the radial direction B. That is, the tangential direction C is circularly oriented around the axis of rotation 31 at a constant radial B distance and at a constant axial a position.

The motor 3 in this embodiment is an alternating current motor 3, a stator of the alternating current motor 3 forms a rotating magnetic field under the action of a multiphase sinusoidal alternating current, most of the rotating magnetic field is interlinked with a rotor, and only a small part of the rotating magnetic field leaks out of the motor 3. The utility model uses the weak magnetic sensor 1 array to measure the leakage flux of the motor 3, then transmits a plurality of signals to the controller 2, the controller 2 calculates the intensity, the frequency and the phase of the leakage magnetic field, the synchronous rotating speed of the motor can be obtained by the voltage frequency of the stator, and the rotating direction of the motor can be obtained by the arrangement position relationship of the phase signals and the weak magnetic sensor 1. The utility model can measure in real time in the normal operation process of the motor 3, does not need to physically contact the rotating part, does not need to weld or paste marks such as a reflector on the rotating part, can be used for measuring the non-invasive rotation direction of the motor 3, has the characteristics of simple structure, low cost, wide application range and the like, can be directly used in the non-exposed occasions where the motor 3 and a pump body are integrated, and can also be applied to the steering judgment of the running motor or the testing occasions where accessories such as a magnetizer, a rotary encoder and the like cannot be installed.

Example 2

With reference to fig. 1-4, compared with the technical solution of embodiment 1, the apparatus for detecting the rotation direction of the motor of the present embodiment can be improved as follows: the weak magnetic sensor 1 is used for measuring low-frequency and direct-current magnetic field signals. The measurement function of low frequency and direct current magnetic field signal ensures that the weak magnetic sensor 1 can measure the synchronous rotating speed of the motor 3 in the extremely low speed state and the zero speed maintaining state of the motor 3.

Example 3

With reference to fig. 1-4, the apparatus for detecting the rotation direction of the motor in the present embodiment can be improved as follows compared with the technical solutions in embodiments 1 or 2: the number of the weak magnetic sensors 1 is two, the weak magnetic sensors are respectively a first sensor 11 and a second sensor 12, and the first sensor 11 and the second sensor 12 are distributed along the circumferential tangential direction C of the motor 3. When the phase of the magnetic field detected by the first sensor 11 is advanced from the phase of the magnetic field detected by the second sensor 12, the motor 3 rotates in the direction from the first sensor 11 to the second sensor 12; similarly, when the phase of the magnetic field detected by the first sensor 11 lags behind the phase of the magnetic field detected by the second sensor 12, the motor 3 rotates in the direction from the second sensor 12 to the first sensor 11. In other embodiments, the number of the weak magnetic sensors 1 may be 3, 4 or more, and radial B-circumference leakage magnetic signals at more positions may be collected for the verification function, so that the measured result is more reliable.

Example 4

With reference to fig. 1-4, compared with any of embodiments 1-3, the apparatus for detecting the rotation direction of the motor of the present embodiment can be improved as follows: the weak magnetic sensor is characterized by further comprising a signal amplification circuit, wherein the weak magnetic sensor 1, the signal amplification circuit and the controller 2 are sequentially connected. The weak magnetic sensor 1 is transmitted to the controller 2 in an analog or digital manner through a signal amplifying circuit.

Example 5

With reference to fig. 1-4, compared with any of embodiments 1-4, the apparatus for detecting the rotation direction of the motor of the present embodiment can be improved as follows: the weak magnetic sensor 1 is a magnetoresistive sensor.

Example 6

With reference to fig. 1-4, compared with any of embodiments 1-5, the apparatus for detecting the rotation direction of the motor of the present embodiment can be improved as follows: the controller 2 is connected with a display unit. The display unit can visually display the rotation direction of the motor 3.

Example 7

With reference to fig. 1-4, compared with any of embodiments 1-6, the apparatus for detecting the rotation direction of the motor of the present embodiment can be improved as follows: the controller 2 is connected with a storage unit. The storage unit is used for storing data information.

Example 8

With reference to fig. 1-4, the apparatus for detecting a rotation direction of a motor according to the present embodiment can be improved as follows compared with any of the embodiments 1-7: the controller 2 is a single chip microcomputer.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the utility model, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the utility model.

Claims

1. The utility model provides a detect device of motor direction of rotation which characterized in that, includes a plurality of weak magnetic sensors and the controller of being connected with weak magnetic sensor, and is a plurality of weak magnetic sensor distributes along the circumference tangential direction of motor, weak magnetic sensor is used for gathering the magnetic leakage signal of motor, the controller is used for receiving the magnetic leakage signal of weak magnetic sensor transmission and judges motor direction of rotation.

2. The apparatus for detecting a rotational direction of a motor according to claim 1, wherein the weak magnetic sensor is configured to measure low frequency and direct current magnetic field signals.

3. The apparatus for detecting a rotational direction of a motor according to claim 1, wherein the field weakening sensors are two, i.e., a first sensor and a second sensor, which are distributed in a circumferential tangential direction of the motor.

4. The apparatus for detecting a rotation direction of a motor according to claim 1, further comprising a signal amplification circuit, wherein the field weakening sensor, the signal amplification circuit and the controller are connected in sequence.

5. The apparatus for detecting a rotational direction of a motor according to claim 1, wherein the weak magnetic sensor is a magnetoresistive sensor.

6. The apparatus of claim 1, wherein a display unit is connected to the controller.

7. The apparatus for detecting a rotational direction of a motor according to claim 1, wherein a storage unit is connected to the controller.

8. The apparatus of claim 1, wherein the controller is a single-chip microcomputer.