Electric compressor position identification device

Abstract

The utility model discloses a position identification device for an electric compressor, which belongs to the technical field of compressor controllers and comprises a shell assembly, a motor assembly and a controller assembly, and the shell assembly comprises a first shell and a second shell which are connected with each other; the rotating assembly comprises an electric compressor rotor and a shaft, the electric compressor rotor is arranged in the first shell, and the shaft penetrates through the electric compressor rotor and is connected with the electric compressor rotor for common rotation; the position recognition assembly comprises a magnet embedded in the shaft, a PCBA installed on the second shell and an angle sensor installed on the PCBA, and the angle sensor achieves position recognition by detecting the magnetic field change of the magnet rotating along with the shaft; according to the utility model, the angle position of the motor rotor can be accurately identified, so that the rotating speed of the motor can be more accurately controlled to meet complex working conditions required by customers.

Description

Technical Field

[0001] The utility model relates to a position identification device for an electric compressor, belonging to the technical field of compressor controllers. Background Art

[0002] With the development of technology, many cars are equipped with onboard refrigerators. The existing electric compressors do not have angle sensors, and the motor speed is estimated by software algorithms, which cannot achieve precise control at low speeds. In car refrigerators, due to the low power of car refrigerators, precise control is required at low speeds. Therefore, the refrigeration of car refrigerators cannot be carried out by traditional electric air-conditioning compressors. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide an electric compressor position identification device that can accurately identify the angular position of the motor rotor, thereby more accurately controlling the motor speed to meet the complex working conditions required by customers.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] In a first aspect, the present invention provides a position identification device for an electric compressor, comprising:

[0006] A housing assembly comprising a first housing and a second housing connected to each other;

[0007] a rotating assembly comprising an electric compressor rotor and a shaft, wherein the electric compressor rotor is disposed in the first housing, and the shaft passes through the electric compressor rotor and is connected thereto for common rotation;

[0008] The position identification component includes a magnet embedded in the shaft, a PCBA installed on the second housing, and an angle sensor installed on the PCBA. The angle sensor realizes position identification by detecting the change of the magnetic field of the magnet as the shaft rotates.

[0009] Furthermore, the angle sensor is mounted on the PCBA through a patch process and is used to detect changes in the magnetic field caused by shaft rotation. The angle sensor includes multiple GMR elements, and the multiple GMR elements are connected to form a Wheatstone bridge structure.

[0010] Furthermore, the PCBA is fixed to the second housing by bolts.

[0011] Furthermore, the second shell is made of metal or plastic.

[0012] Furthermore, a sealing device capable of maintaining sealing under a pressure of 20KPA is provided between the first shell and the second shell.

[0013] Furthermore, the shaft has a groove, and the magnet is embedded in the groove of the shaft.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The utility model provides a position identification device for an electric compressor, which realizes position identification by detecting the magnetic field change of a magnet as the shaft rotates through an angle sensor. It can accurately identify the angular position of the motor rotor, thereby more accurately controlling the motor speed to meet the complex working conditions required by customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic diagram of the overall structure of a method for identifying the position of an electric compressor according to the present utility model.

[0017] In the figure: 1. First housing; 2. Electric compressor rotor; 3. Shaft; 3.1. Magnet; 4. Second housing; 5. PCBA; 5.1. Angle sensor. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0019] Example 1, as Figure 1 As shown, this embodiment introduces a position identification device for an electric compressor. The device comprises a first housing 1, an electric compressor rotor 2, a shaft 3, a magnet 3.1, a second housing 4, a PCBA 5, and an angle sensor 5.1. The magnet 3.1 is mounted on the shaft 3 and passes through the electric compressor rotor 2, rotating with it. The angle sensor 5.1 is a chip mounted on the PCBA 5 using a surface mount process. The PCBA 5 is bolted to the second housing 4. The shaft 3 has a groove into which the magnet 3.1 is embedded. A sealing device is provided between the first housing 1 and the second housing 4, ensuring a complete seal between them even at a pressure of 20 kPa. Any low-permeability material, such as the second housing 4, is within the scope of protection of this utility model. In use, the angle sensor 5.1 detects changes in the magnetic field of the magnet 3.1 as the shaft 3 rotates, achieving position identification (prior art, available at https: / / www.infineon.com / ).

[0020] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A position identification device for an electric compressor, characterized in that: include: A housing assembly comprising a first housing (1) and a second housing (4) connected to each other; A rotating assembly comprises an electric compressor rotor (2) and a shaft (3), wherein the electric compressor rotor (2) is arranged in a first housing (1), and the shaft (3) passes through the electric compressor rotor (2) and is connected thereto for common rotation; A position identification component comprises a magnet (3.1) embedded in a shaft (3), a PCBA (5) mounted on a second housing (4), and an angle sensor (5.1) mounted on the PCBA (5); the angle sensor (5.1) realizes position identification by detecting changes in the magnetic field of the magnet (3.1) as the shaft (3) rotates.

2. The electric compressor position identification device according to claim 1, characterized in that: The angle sensor (5.1) is mounted on the PCBA (5) through a patch process and is used to detect changes in the magnetic field caused by the rotation of the shaft (3). The angle sensor (5.1) includes multiple GMR elements, and the multiple GMR elements are connected to form a Wheatstone bridge structure.

3. The electric compressor position identification device according to claim 1, characterized in that: The PCBA (5) is fastened to the second housing (4) via bolts.

4. The electric compressor position identification device according to claim 1, characterized in that: The second shell (4) is made of metal or plastic.

5. The electric compressor position identification device according to claim 1, characterized in that: A sealing device capable of maintaining sealing at a pressure of 20 KPA is provided between the first shell (1) and the second shell (4).

6. The electric compressor position identification device according to claim 1, characterized in that: The shaft (3) is provided with a groove, and the magnet (3.1) is embedded in the groove of the shaft (3).

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