Analog quantity linear Hall low-speed motor with position output

Abstract

The utility model discloses an analog quantity linear Hall low-speed motor with position output, which comprises a terminal board, a motor stator penetrates through the center of the terminal board, and a plurality of groups of three-phase windings are arranged on the outer cambered surface of the motor stator at equal radian; the upper surface of the terminal plate is provided with a carrier plate in a welding manner, the upper surface of the carrier plate is symmetrically provided with two groups of linear Hall sensors, the difference of electrical placement angles of the two groups of linear Hall sensors is 90 degrees, and the lower surface of the carrier plate is provided with an external interface in a welding manner. The linear Hall sensor can output an absolute position, has an excellent low-speed characteristic, can maintain a stable rotating speed at a low rotating speed, does not increase the axial size of the motor, is small in size, is light in weight, is low in installation difficulty, is excellent in low-speed characteristic, can output absolute position information of the motor at any rotating speed, and is high in reliability. And the device is particularly suitable for high-precision instruments and equipment with small volume, high control precision and large high-low speed dynamic conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of Hall low-speed motors, in particular to an analog linear Hall low-speed motor with position output. Background Art

[0002] The common low-speed inductive motors on the market that can output absolute positions mostly use encoders as sensors to obtain motor angle information. The use of magnetic encoders requires the installation of magnets on the motor shaft. The magnetic encoder is installed on the top of the motor shaft facing the magnet. The installation position requires the gap between the motor shaft magnet plane and the encoder facing plane to be 1.5mm to 2.5mm. Too far or too close distances will affect the position output accuracy of the encoder, which not only increases the axial size of the motor, but also puts forward higher accuracy and process requirements for the matching installation structure design of the motor. There is also a switch quantity Hall motor on the market that cannot output the absolute position of the motor. The switch quantity Hall motor can maintain a certain speed at high speed (>300RPM), but cannot rotate at a stable speed at low speed (<300RPM), so now we need an analog linear Hall low-speed motor with built-in position output. Utility Model Content

[0003] The purpose of the utility model is to provide an analog linear Hall low-speed motor with built-in position output, in which the position sensor and the motor are designed as a whole, the axial size of the motor is not increased, the requirements for the matching installation structure are low, the size is small, and it is easy to install, so as to solve the technical problems mentioned in the background technology.

[0004] To achieve the above purpose, the utility model provides the following technical solution: an analog linear Hall low-speed motor with position output, comprising a terminal board, a motor stator is installed through the center of the terminal board, and a plurality of groups of three-phase windings are arranged on the outer arc surface of the motor stator with equal arc;

[0005] The upper surface of the terminal board is welded with a carrier board, and two groups of linear Hall sensors are symmetrically mounted on the upper surface of the carrier board, and the electrical angles of the two groups of linear Hall sensors are 90° apart, and the lower surface of the carrier board is welded with an external interface;

[0006] The motor stator is covered with a rotor shell on the outside, the motor rotor is rotatably mounted at the center of the rotor shell, and a permanent magnet ring is fitted on the inner wall of the rotor shell.

[0007] Preferably, two groups of connection seats are provided on the upper surface of the terminal board, and a connection plug rod is provided at the bottom of the carrier board, and the connection plug rod is inserted into the connection seat for installation.

[0008] Preferably, a stator winding welding point is opened through the center of the carrier plate, and the motor stator extends from the inside of the welding point and is welded and installed.

[0009] Preferably, a limit seat is installed through the center of the outer end of the rotor housing, and one end of the motor rotor is fixedly inserted into the limit seat.

[0010] Preferably, a ball bearing is installed inside the motor stator, and the end of the motor rotor extends from the inside of the ball bearing to the outer end of the connecting seat.

[0011] Preferably, a gasket is sleeved on the bottom of the terminal board corresponding to the extended position of the motor rotor, and an anti-dropping clip is mounted on the outer side of the gasket on the outer arc surface of the motor rotor.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The linear Hall sensor in the motor of the utility model can output the absolute position, has excellent low-speed characteristics, and can maintain a stable speed at low speed; and the linear Hall motor has the advantages of firm structure, small size, light weight, long life, easy installation, low power consumption, high frequency, vibration resistance, and no fear of pollution or corrosion from dust, oil, water vapor, salt spray, etc.

[0014] 2. The linear Hall sensor in the utility model has the advantages of high precision, good linearity, no contact, no wear of the Hall device, clear output waveform, no jitter, no rebound, high position repetition accuracy, up to μm level, etc., and the position sensor and the motor are designed as a whole without increasing the axial size of the motor. It has the advantages of small size, light weight, low installation difficulty, excellent high-speed and low-speed characteristics, and can output the absolute position information of the motor at any speed. It is particularly suitable for application in high-precision instruments and equipment with small size, high control accuracy, and high and low speed dynamics. Therefore, it has broad application prospects in the fields of measurement, automation, computer and information technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an exploded schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a side view schematic diagram of the overall structure of the utility model;

[0017] Figure 3 It is a cross-sectional schematic diagram of the motor rotor of the utility model;

[0018] Figure 4 This is a schematic diagram of the stator of the motor of the utility model;

[0019] Figure 5 This is a waveform test diagram of the stator assembly of the motor of the utility model.

[0020] In the figure: 1. Terminal board; 2. Connecting seat; 3. Motor stator; 4. Three-phase winding; 5. Carrier board; 6. Stator winding welding point; 7. Linear Hall sensor; 8. External interface; 9. Rotor housing; 10. Limit seat; 11. Motor rotor; 12. Permanent magnet ring; 13. Ball bearing; 14. Gasket; 15. Anti-drop card. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-Figure 4 As shown, the analog linear Hall low-speed motor with built-in position output provided by the utility model includes a terminal board 1, a motor stator 3 is installed through the center of the terminal board 1, and a plurality of groups of three-phase windings 4 are arranged on the outer arc surface of the motor stator 3 with equal arc; a carrier plate 5 is welded and installed on the upper surface of the terminal board 1, two groups of linear Hall sensors 7 are symmetrically installed on the upper surface of the carrier plate 5, and the installation positions of the two groups of linear Hall sensors 7 differ by 90° in electrical angle, and the lower surface of the carrier plate 5 is welded and installed with an external interface 8; the motor stator 3 is covered with a rotor shell 9, and a motor rotor 11 is rotatably installed at the center of the rotor shell 9, and a permanent magnet ring 12 is fitted on the inner wall of the rotor shell 9.

[0023] Furthermore, two sets of connecting seats 2 are provided on the upper surface of the terminal board 1, and connecting rods are provided at the bottom of the carrier board 5, and the connecting rods are inserted into the connecting seats 2 for installation. The connecting seats 2 provided on the upper surface of the terminal board 1 cooperate with the connecting rods at the bottom to quickly limit the carrier board 5, so that the terminal board 1 and the carrier board 5 can be stably connected, which greatly improves the use accuracy of the device.

[0024] Furthermore, a stator winding welding point 6 is provided through the center of the carrier plate 5, and the motor stator 3 extends out from the inside of the welding point 6 for welding and installation. Several groups of iron cores are fixedly installed on the outer surface of the motor stator 3, which plays an important role in conducting current. When current passes through the iron core, a magnetic field is generated inside the iron core, thereby driving the motor rotor 11 to rotate. The three-phase winding 4 is a transmission path for current. The three-phase winding 4 is wound on the iron core. Different combined conduction modes of the three-phase winding 4 generate an alternating magnetic field on the iron core to drive the motor rotor 11 to rotate.

[0025] It is worth noting that a limit seat 10 is installed through the center of the outer end of the rotor housing 9, one end of the motor rotor 11 is fixedly inserted into the limit seat 10, and the permanent magnet ring 12 is magnetized with four pairs of poles. The permanent magnet ring 12 can produce four pairs of alternating N-pole and S-pole changes when it rotates one circle. The permanent magnet ring 12 is fixed on the rotor housing 9 structure to provide a continuous and stable magnetic field for the motor, and provide a torque when the motor stator 3 generates an alternating magnetic field. The motor rotor 11 is fixedly connected to the rotor housing 9 structure, which is the central axis of the motor rotation and an important carrier of the motor torque output. The permanent magnet ring 12 and the motor rotor 11 are tightly combined together through the housing structure.

[0026] Specifically, a ball bearing 13 is installed inside the motor stator 3, and the end of the motor rotor 11 extends from the inside of the ball bearing 13 to the outer end of the connecting seat 2. The ball bearing 13 is fixed between the motor rotor 11 and the motor stator 3 to reduce the friction damping between the motor rotor 11 and the motor stator 3 when the motor rotor 11 rotates.

[0027] In addition, a gasket 14 is sleeved on the bottom of the terminal board 1 corresponding to the extended position of the motor rotor 11, and an anti-detachment clip 15 is installed on the outer side of the gasket 14 and clamped on the outer arc surface of the motor rotor 11. The anti-detachment clip 15 is fixed at the end of the motor rotor 11 to prevent the motor stator 3 from detaching from the motor rotor 11.

[0028] like Figure 5 As shown, Figure 5 This is a waveform test diagram of the stator component of the motor. The linear Hall element outputs different voltage signals (analog signals) according to the size of the magnetic field. The linear Hall will output a parabolic stroke according to the strength of the magnetic field. However, when the magnetic field strength exceeds the highest point in a certain range, the output remains unchanged.

[0029] SVPWM open loop test: rated voltage 7.6V, duty cycle 80%, frequency 40KHZ, stator assembly into the standard rotor, test one circle, the results show:

[0030] ①. The peaks of the two Hall waveforms are not less than 1440ADC, and the troughs are not higher than 920ADC;

[0031] ② The peak-to-peak value difference between the two Hall waveforms shall not exceed 150ADC.

[0032] It can be seen that the linear Hall sensor can output absolute position, has excellent low-speed characteristics, and can maintain a stable speed at low speeds.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Analog linear Hall low-speed motor with built-in position output, characterized by: It comprises a terminal board (1), a motor stator (3) is installed through the center of the terminal board (1), and a plurality of groups of three-phase windings (4) are arranged on the outer arc surface of the motor stator (3) with equal arcs; A carrier plate (5) is welded and mounted on the upper surface of the terminal plate (1), two groups of linear Hall sensors (7) are symmetrically mounted on the upper surface of the carrier plate (5), and the electrical angles of the two groups of linear Hall sensors (7) are 90° apart, and an external interface (8) is welded and mounted on the lower surface of the carrier plate (5); The motor stator (3) is covered with a rotor housing (9) on the outside, a motor rotor (11) is rotatably mounted at the center of the rotor housing (9), and a permanent magnet ring (12) is fitted on the inner wall of the rotor housing (9).

2. The analog linear Hall low-speed motor with position output according to claim 1, characterized in that: Two groups of connection seats (2) are provided on the upper surface of the terminal board (1), a connection plug rod is provided at the bottom of the carrier board (5), and the connection plug rod is inserted into the connection seat (2) for installation.

3. The analog linear Hall low-speed motor with position output according to claim 2, characterized in that: A stator winding welding point (6) is provided through the center of the carrier plate (5), and the motor stator (3) extends out from the inside of the welding point (6) for welding and installation.

4. The analog linear Hall low-speed motor with position output according to claim 3 is characterized in that: A limiting seat (10) is installed through the center of the outer end of the rotor housing (9), and one end of the motor rotor (11) is fixedly inserted into the limiting seat (10).

5. The analog linear Hall low-speed motor with position output according to claim 4, characterized in that: A ball bearing (13) is installed inside the motor stator (3), and the end of the motor rotor (11) extends from the inside of the ball bearing (13) to the outer end of the connecting seat (2).

6. The analog linear Hall low-speed motor with position output according to claim 5, characterized in that: A gasket (14) is sleeved on the bottom of the terminal board (1) corresponding to the extended position of the motor rotor (11), and an anti-dropping clip (15) is mounted on the outer side of the gasket (14) and is located on the outer arc surface of the motor rotor (11).

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