CN216530991U - Novel motor - Google Patents

Abstract

The utility model discloses a novel motor, which comprises a motor stator and a motor rotor arranged in the motor stator, wherein the motor rotor is connected with an industrial sewing machine, two ends of a motor rotor shaft in the center of the motor rotor extend out of the motor stator, a radial magnet is fixed at one end of the motor rotor shaft, the radial magnet is a radial magnetizing round magnet, the magnet only has a pair of NS poles, a through hole connected with the motor rotor shaft is formed in the center of the radial magnet, the radial magnet is coaxial with the motor rotor shaft, a magnetic position sensor assembly is arranged on the outer side end face of the radial magnet, and the magnetic position sensor assembly senses the magnetic field position of the rotating radial magnet. The utility model realizes the absolute angle measurement of 0-360 degrees based on the anisotropic magnetoresistance technology and the special signal processing technology, can realize more accurate position detection and worse environment tolerance, and can reduce redundant motor reset action.

Description

Novel motor

Technical Field

The utility model relates to the technical field of industrial sewing machines, in particular to a novel industrial sewing machine motor with excellent positioning precision.

Background

The power of the industrial sewing machine is provided by a motor, the sewing machine needs to be frequently started and stopped frequently in specific operation, and the position of a needle of the sewing machine needs to be considered when the sewing machine stops. One of the indexes for evaluating the industrial sewing machine is the stop position of the industrial sewing machine, so the stop position is an important control index and relates to the influences of personal safety, cloth taking and feeding, sewing effect and the like.

The traditional industrial sewing machine uses a motor position sensor which has a Hall mode and a photoelectric encoder mode. Disclose a permanent-magnet machine rotor magnetite position detection box in patent CN 207459952U, utilize the hall sensor cooperation diode that distributes, realize short-term test magnetite polarity distribution, hall sensor locating position is not accurate enough, and the reliability is not high.

Patent CN 206117425U discloses a servo motor and magnetic ring formula motor encoder, the magnetic ring rotates along with the axis of rotation synchronization, the magnetic field induction unit sets up along the border of magnetic ring, does not have the contact between magnetic field induction unit and the magnetic ring, and the rotation position of magnetic ring is inducted out to the rotation position of magnetic field induction unit dependence axis of rotation, and then the rotation position of reaction axis of rotation, and the induction process can not receive the influence of structure, has reduced the installation requirement, can also guarantee the position precision simultaneously. But photoelectric encoder accurate positioning, but need all carry out the action that resets at every turn on the electricity and just can confirm the needle position that stops, and photoelectric encoder receives installation accuracy, greasy dirt dust environment influence great.

In addition, considering the working environment and the specific operation of the industrial sewing machine, a motor specially designed for the industrial sewing machine needs to be designed, the starting and stopping positions of the sewing machine can be accurately detected, redundant motor resetting actions are reduced, and the motor can endure severe environment.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a novel motor, which realizes the measurement of an absolute angle of 0-360 degrees based on an anisotropic magnetic resistance technology and a special signal processing technology, can realize more accurate position detection and harsher environment tolerance, and can reduce redundant motor reset action.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: the utility model provides a novel motor, includes motor stator and sets up in the inside electric motor rotor of motor stator, electric motor rotor is connected its characterized in that with industrial sewing machine motor stator is stretched out to the motor stator outside at the electric motor rotor axle both ends at electric motor rotor center, shaft coupling and industrial sewing machine axle coaxial arrangement are passed through to electric motor rotor axle wherein one end, and the electric motor rotor axle other end is fixed with radial magnetite, radial magnetite is the circular magnetite of radially magnetizing, and this magnetite only is a pair of NS utmost point, and radial magnetite center is equipped with the through-hole with the electric motor rotor hub connection, and radial magnetite is coaxial with the electric motor rotor axle, and the outside terminal surface of radial magnetite is equipped with magnetism position sensor subassembly, magnetism position sensor subassembly response rotatory radial magnetite magnetic field position.

Radial magnetite in this scheme rotates along with electric motor rotor axle synchronization, and the change of its magnetic field around is responded to by being located near magnetic position sensor subassembly to the position of quick location electric motor rotor axle, the induction process can not receive the influence of structure, guarantees to detect the position accuracy, has realized 0 ~ 360 absolute angle measurement.

Based on the scheme, the radial magnet is made of samarium cobalt magnet SmCo5, the remanence Br is 0.9 +/-0.1T, the diameter is 10 +/-0.5 mm, and the thickness is 1.7 +/-0.2 mm.

Because radial magnetite magnetic field intensity is too big or the undersize all can increase extra position angle error, through analysis and test, influences magnetic circuit magnetic field intensity factor and mainly has magnetic material, size and thickness etc. consequently, has done the restraint to the structure and the magnetic field intensity of radial magnetite, makes its stop position detect more accurately.

On the basis of above-mentioned scheme, further inject, magnetism position sensor subassembly includes main chip, circuit board and pencil, wherein the circuit board is circular circuit board, main chip sets up in the central point of this circuit board and puts, the circuit board passes through spliced pole fixed support in motor stator terminal surface, and parallel with radial magnetite, main chip center is coaxial with radial magnetite, and main chip moulds the front cover and keeps at 2.5 +/-0.5 mm apart from between the radial magnetite, pencil one end is connected with the output pin who is located the circuit board edge, the pencil other end is connected with machine controller for the motor angle position information that main chip sent is transmitted.

The magnetic position sensor assembly is used for sensing the magnetic field position of the rotating radial magnet and transmitting the magnetic field position through pulse or communication data, and the motor controller receives different angle information to perform corresponding motor phase change control, so that the normal rotation of the motor can be ensured.

The working principle of the utility model is based on the Anisotropic Magnetoresistance (AMR) technology, the anisotropic magnetoresistance sensor is formed by depositing an iron-nickel alloy film on a silicon substrate, and the films are arranged in a strip form during deposition to form a planar linear array so as to increase the area of a magnetic sensing field of the magnetoresistance. When an external magnetic field is applied to such a ferromagnetic thin film, the magnetic domains rotate, changing the spatial orientation, which causes the apparent resistance of the linear array of thin film strips to change. Specifically, the resistance on the opposite arms of the bridge increases, while the resistance on the other opposite arms decreases, in response to changes in the voltage output of the bridge.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: (1) the utility model realizes the measurement of an absolute angle of 0-360 degrees based on an anisotropic magnetic resistance technology and a special signal processing technology, utilizes a radial magnet and a magnetic position sensor assembly, realizes the detection of the stop position of a motor by designing the structure and the residual magnetism of the radial magnet and restricting the position relation with the magnetic position sensor assembly, is applied to an industrial sewing machine, quickly acquires the position of a sewing machine needle, is convenient for the subsequent design of the sewing machine control, and meets the use requirement. The scheme replaces a Hall or optical-coded position sensor commonly used by the existing industrial sewing machine, the position detection is more accurate, the environment is more severe, and the redundant motor resetting action can be reduced. (2) The magnetic position sensor assembly only comprises a round magnet and a magnetic position sensor assembly, the magnetic position sensor assembly is not in contact with the round magnet, the magnetic position sensor assembly senses the change of a magnetic field and depends on the rotation of the rotating shaft, and the rotating position of the rotating shaft is further reflected.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the arrangement of radial magnets in the present invention;

FIG. 3 is a magnetic position sensor assembly of the present invention;

FIG. 4 is a schematic diagram of the system control of the present invention in a particular use;

FIG. 5 is a test result in the testing of the system of the present invention;

in the figure: 1. the motor comprises a motor stator, 2, a motor rotor shaft, 3, a radial magnet, 4, a magnetic position sensor assembly, 5, a main chip, 6, a circuit board, 7, a wire harness, 8 and a motor controller.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of a novel motor structure according to the present invention, the motor-driven industrial sewing machine includes a motor stator 1 and a motor rotor disposed inside the motor stator 1, the motor rotor is connected to a driving shaft of the industrial sewing machine, and the industrial sewing machine is shown in the figure. The motor stator 1 and the motor rotor are basic components of a general motor, and the winding mode of the stator rotor, the number of magnet poles and other states are various, and are not described in detail herein. On the basis of a motor stator 1 and a motor rotor, two ends of a motor rotor shaft 2 in the center of the motor rotor are required to extend out of the motor stator 1, a radial magnet 3 is fixed at one end of the motor rotor shaft 2, the radial magnet 3 is coaxial with the motor rotor shaft 2, a magnetic position sensor assembly 4 is arranged on the outer end face of the radial magnet 3, and the magnetic position sensor assembly 4 senses the magnetic field position of the rotating radial magnet 3.

FIG. 2 is a plan view of a radial magnet 3, the radial magnet 3 is a radial magnetizing circular magnet, the magnet has only a pair of NS poles, a through hole connected with a motor rotor shaft 2 is arranged at the center of the radial magnet 3, and extra position angle errors can be increased due to overlarge or undersize magnetic field intensity of the radial magnet 3. The factors influencing the magnetic field intensity of the magnetic circuit mainly include magnetic materials, size, thickness and the like. The following is a set of recommended parameters: the radial magnet 3 is made of samarium cobalt magnet SmCo5, the remanence Br is 0.9T, the diameter is 10mm, and the thickness is 1.7 mm.

Fig. 3 is a schematic structural composition diagram of a magnetic position sensor assembly 4, where the magnetic position sensor assembly 4 includes a main chip 5, a circuit board 6 and a wire harness 7, where the circuit board 6 is a circular circuit board, the main chip 5 is disposed at a central position of the circuit board 6, and functions to sense a magnetic field position of a rotating radial magnet and transmit the magnetic field position via pulse or communication data; the circuit board 6 is fixedly supported on the end face of the motor stator 1 through a connecting column, is parallel to the radial magnet 3, and is used for welding components and is used for being installed and positioned with a motor; the center of the main chip 5 is coaxial with the radial magnet 3, and the distance between the plastic cover of the main chip 5 and the radial magnet 3 is kept at 2.5 mm; one end of the wire harness 7 is connected with an output pin positioned on the edge of the circuit board 6, and the other end of the wire harness 7 is connected with the motor controller 8 and used for transmitting motor angle position information sent by the main chip.

FIG. 4 is a schematic diagram of the system control in a specific use of the present invention. The control process is as follows: position calibration is needed after the system is assembled for the first time, namely, a magnetic field zero point of the radial magnet 3 and an angle zero point of the motor are calibrated and correspond to each other, and the motor can be controlled to operate through the magnetic field information of the radial magnet 3 sensed by the magnetic position sensor assembly 4. The best effect after calibration is that 0-1023 data transmitted by the magnetic position sensor represents the motor angle 0-360 degrees, as shown in figure 5. The calibration process is only needed to be carried out once, then the calibration information is stored in relevant devices of the motor controller 8, the absolute position of the motor can be obtained by reading data after the motor is powered on every time, and the motor position information can be obtained by rotating the motor for one circle in an open loop manner without the need of being like a grating coding sensor.

The motor is started by reading the current electric angle information of the motor sent by the magnetic position sensor component 4 through the motor controller 8, and calculating the three-phase sequence of the first motor to be controlled to enable the motor to rotate. When the motor rotates, the radial magnets 3 arranged on the rotor shaft of the motor synchronously rotate, so that the magnetic field information detected by the magnetic position sensor sensing component 4 is synchronously updated and transmitted to the motor controller. The motor controller 8 receives the different angle information to perform corresponding motor phase change control, so that the normal rotation of the motor can be ensured.

The novel motor can realize the accurate positioning and transmission of position information based on the control system, thereby replacing a Hall or optical coding position sensor commonly used by the existing industrial sewing machine, having more accurate position detection, harsher environment resistance and reducing redundant motor resetting action.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims (3)

1. A novel motor comprises a motor stator (1) and a motor rotor arranged inside the motor stator (1), wherein the motor stator (1) is connected with an industrial sewing machine, it is characterized in that two ends of a motor rotor shaft (2) at the center of the motor rotor extend out of a motor stator (1), one end of the motor rotor shaft (2) is coaxially arranged with the shaft of the industrial sewing machine through a coupler, the other end of the motor rotor shaft (2) is fixed with a radial magnet (3), the radial magnet (3) is a radial magnetizing round magnet, the magnet only has a pair of NS poles, the center of the radial magnet (3) is provided with a through hole connected with the motor rotor shaft (2), the radial magnet (3) is coaxial with the motor rotor shaft (2), the end face of the outer side of the radial magnet (3) is provided with a magnetic position sensor assembly (4), and the magnetic position sensor assembly (4) induces the magnetic field position of the rotary radial magnet (3).

2. A new electric machine according to claim 1, characterized in that the material of the radial magnets (3) is samarium cobalt magnet SmCo5, with a remanence Br of 0.9 ± 0.1T, a diameter of 10 ± 0.5mm and a thickness of 1.7 ± 0.2 mm.

3. The novel motor according to claim 1, wherein the magnetic position sensor assembly (4) comprises a main chip (5), a circuit board (6) and a wiring harness (7), wherein the circuit board (6) is a circular circuit board, the main chip (5) is arranged at a central position of the circuit board (6), the circuit board (6) is fixedly supported on an end face of the motor stator (1) through a connecting column and is parallel to the radial magnet (3), the center of the main chip (5) is coaxial with the radial magnet (3), a distance between a plastic cover of the main chip (5) and the radial magnet (3) is kept at 2.5 ± 0.5mm, one end of the wiring harness (7) is connected with an output pin at the edge of the circuit board (6), and the other end of the wiring harness (7) is connected with the motor controller (8) and is used for transmitting motor angular position information sent by the main chip.

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