TWM667088U - Motor rotor position sensing device - Google Patents

Abstract

The invention is a motor rotor position sensing device, wherein the motor has a rotor and a stator composed of a plurality of modules arranged in a ring shape, each module having a yoke at an outer end, a tooth extending radially, and a boot protruding from the end of the tooth to both sides, wherein the sensing device comprises three circuit boards separated from each other and respectively fixed on the stator, each circuit board is provided with a Hall IC, and a positioning piece extends at the edge, the positioning piece is axially embedded and fixed in the spacing between two adjacent teeth of two phases near the boot, so that the Hall ICs on the three circuit boards can sense the magnetic field of the rotor at different angles, thereby sensing the angular position and speed of the rotor when rotating, thereby achieving the effect of convenient assembly and more accurate sensing.

Description

Motor rotor position sensing device

The invention is a motor rotor position sensing device, particularly a sensing device composed of three circuit boards that are separated from each other and assembled on the motor stator, so as to achieve the effect of convenient assembly and improved rotor sensing accuracy.

As is known to all, a motor is composed of a stator in the shape of a hollow cylinder and a rotor pivotally mounted at the inner center of the stator, wherein a sensing circuit board is disposed on the outer side of one end surface of the stator, and a plurality of Hall ICs are disposed on the sensing circuit board. The Hall ICs can detect the angular position of the rotor when rotating by sensing the change of the magnetic field at different positions, thereby controlling the rotation speed of the rotor.

The traditional sensing circuit board is fixed on the insulating support frame of the stator in the form of an arc sheet, so that there is a fixed distance between the multiple Hall ICs and the annular end surface of the stator, which affects the sensing distance between the Hall IC and the rotor. The relative position between the rotor and the Hall IC needs to be adjusted during assembly or manufacturing. In addition, the insulating support frame and the sensing circuit board will occupy the internal space of the motor, affecting the saturation rate of the coil and the motor operation efficiency.

The author has improved the above shortcomings and created the motor rotor position sensor with announcement number M657104. Its feature is that multiple sensing circuit boards are set inside the stator, which makes the distance between multiple Hall ICs and the rotor closer, which is conducive to improving the accuracy of sensing the rotor position. After actual use, it has indeed improved the problems of rotor installation process and coil saturation rate, but it takes time to align multiple sensing circuit boards when splicing them together, so there is still room for improvement in structural design.

The author has improved M657104 again, omitting the steps of splicing and assembling multiple sensing circuit boards, making the structure of installing the sensing circuit board on the motor stator more convenient and faster, and being able to sense the rotor position more accurately, making the rotor sensing structure more perfect.

The purpose of this invention is to provide a motor rotor position sensing device, which includes three circuit boards that are separately assembled on the motor stator, making the structure of installing the sensing circuit board on the motor stator more convenient and faster, saving assembly time.

To achieve the above purpose, the invention is a motor rotor position sensing device, the motor has a hollow cylindrical stator and a rotor pivoted on the inner periphery of the stator, the stator is composed of a plurality of modules arranged in a ring, each module has a yoke at the outer end, a tooth extending radially toward the center of the yoke for the coil to be set, and a boot extending from the end of the tooth to both sides, its characteristics are: The sensing device includes three circuit boards separated from each other and fixed on the stator respectively. Each circuit board is provided with a Hall IC, and a positioning piece extends from the edge. The positioning piece is axially embedded and fixed in the spacing between the two adjacent teeth near the boot, so that the Hall IC on the circuit board protrudes from the outer side of the end surface of the stator, so that the Hall IC on the three circuit boards can sense the magnetic field of the rotor at different angles, thereby sensing the angular position and speed of the rotor when it rotates.

With the above structure, the three circuit boards are assembled separately on the motor stator, eliminating the step of splicing and assembling multiple sensing circuit boards in the prior art, making the circuit board installation on the motor stator more convenient and faster, saving motor assembly time. Furthermore, the Hall IC of each circuit board can sense the magnetic field of the rotor at different angles, and more accurately sense the rotor position.

The following further describes the implementation of each component:

In practice, the three Hall ICs are spaced 120 degrees apart from each other.

In practice, the width of each circuit board is greater than the width of the corresponding positioning sheet.

During implementation, there is a gap between the boots of the two adjacent modules to form an opening, the positioning sheet is provided with at least one through hole corresponding to the opening, and at least one positioning member passes through the opening and is fixed to the through hole.

During implementation, the positioning piece is a rivet.

During implementation, each circuit board is provided with a signal line and a power line for electrical connection with each other.

Compared with the known technology, the present invention omits the step of splicing and assembling multiple sensing circuit boards, so that the three circuit boards can be assembled separately from each other on the motor stator, making the structure of installing the circuit boards on the motor stator more convenient and faster, saving motor assembly time, and the Hall IC of each circuit board can sense the magnetic field of the rotor at different angles, and can sense the rotor position more accurately.

Based on the technical means of this creation, the following lists the implementation methods suitable for this creation, and illustrates them with diagrams as follows:

As shown in the first to fourth figures, the present invention is a motor rotor position sensing device, the motor having a hollow cylindrical stator 100 and a rotor 200 pivotally arranged on the inner periphery of the stator 100, the stator 100 is composed of a plurality of modules 101 arranged in a ring shape, each module 101 having a yoke 102 at an outer end, a tooth 104 extending radially toward the center of the yoke 102 and for the coil 103 to be arranged, and a shoe 105 extending and protruding from the end of the tooth 104 to both sides, and a gap is provided between the shoe 105 of the two adjacent modules 101 to form an opening 106.

The sensing device includes three circuit boards 10, each of which has a positioning piece 11 extending from the edge. The positioning piece 11 is axially embedded and fixed in the spacing between two adjacent teeth 104 of the two phases near the boot 105, so that the three circuit boards 10 are separately fixed on the stator 100, and each circuit board 10 is respectively provided with a signal line and a power line (not shown) for electrical connection with each other.

Each circuit board 10 is provided with a Hall IC 12. After each circuit board 10 is fixed on the stator 100 through the corresponding positioning piece 11, the Hall IC 12 protrudes from the outer side of the end surface of the stator 100, so that the Hall ICs 12 on the three circuit boards 10 can sense the magnetic field of the rotor 200 at different angles, thereby sensing the angular position and speed of the rotor 200 when rotating.

According to the above-mentioned component composition, when the motor is assembled with the sensing device, the positioning piece 11 of each circuit board 10 can be axially embedded and fixed in the spacing between the two-phase adjacent teeth 104 near the boot 105, so that the three circuit boards 10 are assembled on the stator 100 separately from each other, and the magnetic field of the rotor 200 is sensed respectively by the Hall IC 12 of each circuit board 10, thereby omitting the step of splicing and assembling multiple sensing circuit boards in the prior art, making the structure of installing the circuit board 10 on the stator 100 more convenient and faster, saving the motor assembly time.

On the other hand, the Hall IC 12 on each circuit board 10 can accurately sense the magnetic field of the rotor at different angles. Specifically, the three Hall ICs 12 are spaced 120 degrees apart from each other, which is the best sensing position, and can more accurately sense the angular position and speed of the rotor 200 when rotating.

In practice, the width of each circuit board 10 is greater than the width of the corresponding positioning piece 11, so that the overall outline of the circuit board 10 is roughly T-shaped or inverted L-shaped. After the positioning piece 11 is assembled, the circuit board 10 can be against the outer side of the end surface of the boot 105. On the other hand, the Hall IC 12 can be close to the rotor 200, which is beneficial to enhance the magnetic field sensing of the rotor 200.

The circuit board 10 is fixed in a manner that at least one through hole 13 is provided on the positioning piece 11 corresponding to the stator opening 106. After the positioning piece 11 is axially embedded and fixed in the distance between the two adjacent teeth 104 near the boot 105, at least one positioning member 20, such as a rivet, can be passed through the opening 106 and fixed to the through hole 13 to fix the circuit board 10. The structure of the circuit board 10 being installed on the stator 100 is convenient and fast, saving assembly time.

The above-mentioned embodiments and drawings are merely examples of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any objects similar or identical to the purpose, structure, device, features, etc. of the present invention shall fall within the patent scope of the present invention.

100: stator 101: module 102: yoke 103: coil 104: tooth 105: shoe 106: opening 200: rotor 10: circuit board 11: positioning sheet 12: Hall IC 13: perforation 20: positioning piece

Figure 1: Schematic diagram of the installation position of this creation. Figure 2: Schematic diagram of the combination of this creation. Figure 3: Schematic diagram of the combination of this creation from top view. Figure 4: Schematic diagram of the three Hall ICs of this creation with a 120-degree interval between each other.

100: stator

101:Module

102: yoke

103: Coil

104: Teeth

105: Boots

106: Open mouth

10: Circuit board

11: Positioning piece

12: Hall IC

13: Perforation

20: Positioning piece

Claims (6)

A motor rotor position sensing device, the motor has a hollow cylindrical stator and a rotor pivoted on the inner periphery of the stator, the stator is composed of a plurality of modules arranged in a ring shape, each module has a yoke at the outer end, a tooth extending radially toward the center of the yoke for the coil to be set, and a boot extending from the end of the tooth to both sides, its characteristics are: The sensing device includes three circuit boards separated from each other and fixed on the stator respectively. Each circuit board is provided with a Hall IC, and a positioning piece extends from the edge. The positioning piece is axially embedded and fixed in the spacing between the two adjacent teeth near the boot, so that the Hall IC on the circuit board protrudes from the outer side of the end surface of the stator, so that the Hall IC on the three circuit boards can sense the magnetic field of the rotor at different angles, thereby sensing the angular position and speed of the rotor when it rotates. A motor rotor position sensing device as described in claim 1, wherein the three Hall ICs are spaced 120 degrees apart from each other. A motor rotor position sensing device as described in claim 1, wherein the width of each circuit board is greater than the width of the corresponding positioning plate. A motor rotor position sensing device as described in claim 1, wherein a gap is provided between the boots of the two adjacent modules to form an opening, the positioning plate is provided with at least one through hole corresponding to the opening, and at least one positioning member passes through the opening and is fixed to the through hole. A motor rotor position sensing device as described in claim 4, wherein the positioning member is a rivet. A motor rotor position sensing device as described in any one of claims 1 to 5, wherein each circuit board is provided with a signal line and a power line for electrical connection to each other.

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