CN215296135U

CN215296135U - Device for measuring position of motor component

Info

Publication number: CN215296135U
Application number: CN202120380388.8U
Authority: CN
Inventors: 苏杉
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-19
Filing date: 2021-02-19
Publication date: 2021-12-24
Anticipated expiration: 2031-02-19

Abstract

The utility model discloses a survey device of motor part position, including linear electric motor, linear electric motor has the device that is used for surveying the position of first motor part for second motor part, wherein a plurality of positions on first motor part are provided with the magnetic field sensor of pointing to second motor part, second motor part includes a region along the direction of motion, be provided with the magnet of a certain distance each other along the direction of motion in this region, a subregion of this region does not have the magnet, the magnet is regularly spaced apart each other with interval b outside the subregion in this region, the length of subregion is greater than or at least equal to interval b in the direction of motion, the part that is used for confirming the relative position of second motor part for first motor part is connected with magnetic field sensor; the magnetic field sensor is a magnetic encoder and also comprises a logic device, and the magnetic encoder is connected with the logic device. The utility model discloses a magnetic encoder replaces hall sensor, cost and fault rate have been reduced.

Description

Device for measuring position of motor component

Technical Field

The utility model relates to a linear electric motor technical field, in particular to survey device of motor position

Background

Referring to fig. 1, the conventional linear motor is generally divided into a first motor part 1 and a second motor part 2, where the second motor part 2 is composed of n pairs of magnetic poles, where n is often thousands, and because of cost limitation, the magnetic poles are made of ferrite materials, and the ferrite materials have disadvantages of small coercive force, weak demagnetization resistance, low strength, and easy breakage, and in practical application examples, demagnetization, weakening magnetism, disappearance, even magnetic reversal, or chipping and deletion due to high-speed motion often occur. The large magnetic quantity and uncertainty of the material make the magnetic poles of the linear motor have a high probability of failure and loss, directly resulting in the failure of the sensor that detects the position of the second motor component by detecting the magnetic field of the magnetic pole and the emission of an error signal.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the aforesaid that exists is not enough to provide a device of survey motor part position that detectivity is high to prior art.

The utility model discloses the technical problem that will solve can realize through following technical scheme:

a device for determining the position of a motor part, comprising a linear motor with means for determining the position of a first motor part relative to a second motor part, wherein magnetic field sensors directed towards the second motor part are arranged at a plurality of positions on the first motor part, the second motor part comprises, in the direction of movement, a region in which magnets are arranged at a distance from one another in the direction of movement, a section of the region being free of magnets, the magnets being regularly spaced apart from one another outside the section in the region by a spacing b, the length of the section in the direction of movement being greater than or at least equal to the spacing b, means for determining the relative position of the second motor part relative to the first motor part being connected to the magnetic field sensors; the magnetic field sensor is characterized by being a magnetic encoder and further comprising a logic device, wherein the magnetic encoder is connected with the logic device.

The utility model discloses a magnetic encoder detects second motor element position, has improved and has detected accurate nature, the cost is reduced.

Drawings

Fig. 1 is a schematic view of a conventional linear motor.

Fig. 2 is a schematic diagram of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings and the detailed description.

Referring to fig. 2, a linear motor is shown for determining a position of a motor member, wherein the linear motor includes a first motor member 20, the first motor member 20 including a plurality of windings for generating an alternating magnetic field. The magnets of the second motor part 10 are shown in fig. 2. These magnets are alternately magnetized so that north poles N and south poles S alternately appear perpendicular to the direction of motion. The arrangement of the magnets is regularly designed with a period length xp, wherein the magnets are arranged one behind the other with a distance b × p/2. Here, the arrangement has a finite length.

Three systems of three magnetic encoders a, b, c are arranged in sequence at regular intervals in the direction of movement. The three magnetic encoders a, b, c are arranged in order of a period length xp. The three magnetic encoders a, b, c are connected to a logic device D, i.e., the signals of the magnetic encoders a, b are logically determined by the logic device D, wherein the logical operation result is determined by majority decision. The logic device D finally outputs a position signal of the second electromechanical component 20.

In this way, although two failed magnetic blocks 11 are shown in FIG. 2, a track signal without voids can be generated. Thus, it is possible to envisage determination of the position of the second motor part 20 which is movably arranged relative to the first motor part 10. Interferences caused by failures or deletions can be excluded.

In a further advantageous embodiment, the magnetic encoders a, b, c are arranged at other distances from one another, which distances are in each case integer multiples of xp.

Claims

1. A device for determining the position of a motor part, comprising a linear motor with means for determining the position of a first motor part relative to a second motor part, wherein magnetic field sensors directed towards the second motor part are arranged at a plurality of positions on the first motor part, the second motor part comprises, in the direction of movement, a region in which magnets are arranged at a distance from one another in the direction of movement, a section of the region being free of magnets, the magnets being regularly spaced apart from one another outside the section in the region by a spacing b, the length of the section in the direction of movement being greater than or at least equal to the spacing b, means for determining the relative position of the second motor part relative to the first motor part being connected to the magnetic field sensors; the magnetic field sensor is characterized by being a magnetic encoder and further comprising a logic device, wherein the magnetic encoder is connected with the logic device.