CN205160338U - Linear motor - Google Patents
Linear motor Download PDFInfo
- Publication number
- CN205160338U CN205160338U CN201521010406.4U CN201521010406U CN205160338U CN 205160338 U CN205160338 U CN 205160338U CN 201521010406 U CN201521010406 U CN 201521010406U CN 205160338 U CN205160338 U CN 205160338U
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- iron core
- permanent magnet
- electric motors
- linear electric
- teeth groove
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Abstract
The utility model discloses a linear motor, including elementary iron core (1), primary (2), secondary iron core (3) and permanent magnet (4), elementary iron core (1) goes up to open there are a plurality of tooth's socket, primary (2) are on tooth forming between adjacent tooth's socket, secondary iron core (3) are located elementary iron core (1) below is as the base of preset length, permanent magnet (4) fixed array be in on secondary iron core (3), the pole span of permanent magnet (4) and the ratio of the tooth pitch between the tooth's socket are the mark. This utility model linear motor simple structure, the operation is stable convenient, and it is undulant to reduce thrust to a certain extent.
Description
Technical field
The utility model relates to technical field of motors, relates to a kind of linear electric motors specifically.
Background technology
Linear electric motors are the devices converting electrical energy into linear reciprocal movement.In prior art, the operational efficiency of linear electric motors is low, and operational efficiency is by the restriction of several factors, and most importantly the force oscillation of motor is on the impact of motor operational efficiency.But the existence of force oscillation is inevitable, and a series of measure can only be taked to weaken the existence of fluctuation.Therefore, the problems demand of force oscillation is suppressed to solve.
Utility model content
The purpose of this utility model solves prior art Problems existing, and provide a kind of structure simple, stable convenience, can reduce the linear electric motors of force oscillation to a certain extent, and improves the optimization verification method of motor operational efficiency.
To achieve these goals, the utility model technical scheme of taking is this linear electric motors provided, comprise elementary iron core, primary coil, secondary iron core and permanent magnet, described elementary iron core has multiple teeth groove, described primary coil is around in the teeth formed between adjacent sheaves, described secondary iron core is positioned at the pedestal as given length below described elementary iron core, described permanent magnet stationary arrangement is on described secondary iron core, and the ratio of the tooth pitch between the pole span of described permanent magnet and teeth groove is mark.
For making technique scheme more detailed and concrete, the utility model also provides following further optimal technical scheme, to obtain satisfied practical function:
Described secondary iron core is provided with at least one pair of permanent magnet.
Described secondary iron core is provided with in addition at least one pair of external permanent magnet, and has a pair built-in permanent magnet at least.
Described teeth groove is be located at the open slot on described elementary iron core, and described teeth lower end is provided with the boss extended towards adjacent sheaves side, preset clearance between the boss of described teeth groove openend both sides, and described openend is formed semi-closed state.
The upper surface of described boss is the inclined-plane of downward gradual change.
The pole span of described permanent magnet is 1.5 times of the tooth pitch between teeth groove.
The utility model compared with prior art, has the following advantages: the utility model structure of the linear motion actuator is simple, stable convenience; Can suppress the force oscillation of motor to a certain extent, by checking, the motor of the slot number matching factor optimized, Slot force is less than the Slot force of other linear electric motors, thus reaches the effect suppressing force oscillation.
Accompanying drawing explanation
Below the content expressed by the accompanying drawing of this specification and the mark in figure are briefly described:
Fig. 1 is the utility model structure of the linear motion actuator schematic diagram;
Fig. 2 is the utility model linear electric motors slot number matching structure schematic diagram;
Fig. 3 is the utility model linear electric motors optimum slot number matching structure schematic diagram.
Be labeled as in figure: 1, elementary iron core, 2, primary coil, 3, secondary iron core, 4, permanent magnet, 41, built-in permanent magnet, 42, external permanent magnet.
Embodiment
Contrast accompanying drawing below, by the description to optimum embodiment, embodiment of the present utility model is described in further detail.
Slot force is the power that the interphase interaction of permanent magnet and iron core produces, even if armature winding no power, Slot force also exists.The Slot force of linear electric motors changes along with the change of the position between the teeth groove of motor and permanent magnet, thus allows thrust produce fluctuation.Between mover and stator, air-gap permeance changes, and magnetic field energy changes, thus produces Slot force.
The utility model linear electric motors, that one can reduce force oscillation, there is the motor of less Slot force, as shown in Figure 1, comprise elementary iron core 1, primary coil 2, secondary iron core 3 and permanent magnet 4, elementary iron core 1 has multiple teeth groove, primary coil 2 is around in the teeth between adjacent sheaves, secondary iron core 3 is positioned at the pedestal as given length below elementary iron core 1, permanent magnet 4 arrangement is fixed on secondary iron core 3, the ratio of the tooth pitch between the pole span of permanent magnet 4 and teeth groove is mark, i.e. slot number matching factor
for mark, as shown in Figure 2, structural design of the present utility model can obtain less Slot force.Linear electric motors are because the design feature of himself makes motor there is side-termind effect and Slot force, the utility model is from the angle suppressing motor Slot force, suppress Slot force by changing linear electric motors slot number coupling, thus the effect suppressing linear motor pushing force fluctuation can be reached.
On secondary iron core 3, at least one pair of permanent magnet 4 is provided with in the utility model.Secondary iron core 3 is provided with in addition at least one pair of external permanent magnet 42, has a pair built-in permanent magnet 41 at least.Built-in permanent magnet 41 and a pair external permanent magnet 42 are formed magnetic spring in the mode of magnetic force mutual exclusion.As shown in fig. 1, when elementary iron core 1 is static, under coverage is built-in permanent magnet 41, and all the other are external permanent magnet 42.
Teeth groove is be located at the open slot on elementary iron core 1, and teeth lower end is provided with the boss extended towards adjacent sheaves side, and preset clearance between the boss of teeth groove openend both sides, forms semi-closed state by openend.The upper surface of boss is the inclined-plane of downward gradual change.This vibrational power flow can provide magnetic circuit better, ensures the stability run.
In order to suppress the force oscillation of linear electric motors, improve linear electric motors output performance, the utility model linear electric motors suppress motor Slot force on the impact of motor by the change tooth pitch of linear electric motors and the pole span of permanent magnet, thus realize the improvement to force oscillation.Slot number match condition such as Fig. 2 shows, when keeping teeth groove size and shape constant, changes corresponding permanent magnet, determines different slot number matching factors
to slot number matching factor
different motors is studied, and rendering model in finite element analysis software also emulates, and different slot number couplings, Slot force is different.
By optimizing checking, preferred in the utility model, the pole span of permanent magnet 4 is 1.5 times of the tooth pitch between teeth groove, can be suppressed the effect of force oscillation preferably, as shown in Figure 3.
To be fixed with the secondary iron core 3 of permanent magnet 4 as stator, the elementary iron core 1 being wound with primary coil 2, as mover, secondary iron core 3 does horizontal round rectilinear motion.The main source of force oscillation is slot effect, in order to improve the runnability of linear electric motors, must study the technical measures reducing motor slot effect.In research process, the mathematical principle of linear electric motors is analyzed, and carry out mathematical modeling, use finite element analysis to carry out analog simulation to the linear electric motors of different slot number respectively, obtain optimum slot number matching factor.Thus force oscillation when making linear electric motors run obtains suppression to a certain degree, improve motor and export, achieve the stability that linear electric motors run.
Concrete, the utility model also provides a kind of optimization verification method improving linear electric motors operational efficiency, comprises the steps:
1) cogging torque of permanent magnet rotating electric machine is defined as the negative derivative of inner magnetic coenergy W relative to position angle α, that is:
the position angle of the similar permanent magnet rotating electric machine of the relative position of stator, mover in TPMLM, can obtain Slot force definition in linear electric motors:
slot force definition in linear electric motors:
the one-period of setting motor movement is exactly the distance of a tooth pitch, and the Slot force that every block permanent magnet produces can be described with Fourier progression, for i-th piece of permanent magnet, determines that the Fourier progression of Slot force is
In formula, x is the displacement of roman mover, and k is harmonic number, k=1,2,3 ..., τ
sfor tooth pitch, F
k,ifor the amplitude of k subharmonic,
it is the phase angle of i-th piece of permanent magnet k subharmonic;
2) phase angle of i-th piece of permanent magnet k subharmonic
in formula, q
pit is the groove number that a pole pair is answered;
3) total Slot force is determined
it is the superposition of the Slot force that 2p magnetic pole produces;
4) slot number matching factor
for the ratio of the pole span of permanent magnet and the tooth pitch of teeth groove, when keeping teeth groove size and shape constant, change corresponding permanent magnet, determine different slot number matching factors
to having different slot number matching factor
motor be optimized checking;
5) by groove number q that a pole pair with different slot number matching factor motor is answered
psubstitute into step 3) in, calculate corresponding Slot force size, draw the motor with minimum Slot force.
According to q
pwhether be integer, two kinds of situations can be divided into: if q
pinteger, the phase angle of the Slot force that every block permanent magnet produces
be identical, the Slot force that whole like this motor produces will be 2p times of the Slot force that single permanent magnet produces; If q
pbe mark, the phase angle of the Slot force that different permanent magnets produces is not identical, and the Slot force of whole motor so just can be made greatly to reduce.Therefore, utilize slot number to coordinate and can weaken Slot force.
The technical solution of the utility model is: carry out on the basis of modeling analysis to the principle of linear electric motors, and use finite element analysis software to emulate, whether the optimum slot number matching factor that checking is derived is reasonable.Slot number match condition as shown in Figure 1, when keeping teeth groove size and shape constant, changes corresponding permanent magnet, determines different slot number matching factors
to slot number matching factor
4 different motors are studied, and obtain result.
In the research process of reality, in order to avoid other factors (as end effect etc.) have an impact to result, in simulation process, electric current is not passed into coil, but control secondary mover with the speed average rate rectilinear motion determined, can select the speed average rate rectilinear motion with 2.3m/s, what draw is only just the impact produced because slot number proportioning is different.
Linear electric motors operation logic: pass into electric current in primary coil 2, produce magnetic flux around coil, magnetic flux, by elementary iron core 1, air gap and secondary iron core 3, forms closed loop magnetic flux.Secondary permanent magnet 4 laterally will do rectilinear motion under the action of a magnetic force, and when the sense of current changes, secondary mover will do contrary motion.If pass into the sinusoidal current of alternation to primary coil 2, then secondaryly laterally doing round rectilinear motion.
The utility model linear electric motors have following good effect: (1) the utility model structure of the linear motion actuator is simple, and it is convenient to run; (2) the utility model straight-line electric function suppresses the force oscillation of motor to a certain extent, verified by the method, the pole span of the permanent magnet optimized is decided to be the linear electric motors of 1.5 times of the tooth pitch of teeth groove, Slot force is less than the Slot force of other linear electric motors, thus reaches the effect suppressing force oscillation.
By reference to the accompanying drawings the utility model is exemplarily described above; but the utility model is not limited to aforesaid way; as long as adopt method of the present utility model is conceived and technical scheme is carried out the improvement of various unsubstantialities or directly apply to other occasion, all drop in protection range of the present utility model.
Claims (6)
1. linear electric motors, it is characterized in that: comprise elementary iron core (1), primary coil (2), secondary iron core (3) and permanent magnet (4), described elementary iron core (1) has multiple teeth groove, described primary coil (2) is around in the teeth formed between adjacent sheaves, described secondary iron core (3) is positioned at the pedestal of described elementary iron core (1) below as given length, described permanent magnet (4) stationary arrangement is on described secondary iron core (3), and the ratio of the tooth pitch between the pole span of described permanent magnet (4) and teeth groove is mark.
2. according to linear electric motors according to claim 1, it is characterized in that: on described secondary iron core (3), be provided with at least one pair of permanent magnet (4).
3. according to linear electric motors according to claim 2, it is characterized in that: described secondary iron core (3) is provided with in addition at least one pair of external permanent magnet (42), and have a pair built-in permanent magnet (41) at least.
4. according to linear electric motors according to claim 1, it is characterized in that: described teeth groove is for being located at the open slot on described elementary iron core (1), described teeth lower end is provided with the boss extended towards adjacent sheaves side, preset clearance between the boss of described teeth groove openend both sides, forms semi-closed state by described openend.
5. according to linear electric motors according to claim 4, it is characterized in that: the upper surface of described boss is the inclined-plane of downward gradual change.
6. according to the linear electric motors described in any one of claim 1 to 5, it is characterized in that: the pole span of described permanent magnet (4) is 1.5 times of the tooth pitch between teeth groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521010406.4U CN205160338U (en) | 2015-12-04 | 2015-12-04 | Linear motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521010406.4U CN205160338U (en) | 2015-12-04 | 2015-12-04 | Linear motor |
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| Publication Number | Publication Date |
|---|---|
| CN205160338U true CN205160338U (en) | 2016-04-13 |
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| CN201521010406.4U Expired - Fee Related CN205160338U (en) | 2015-12-04 | 2015-12-04 | Linear motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515333A (en) * | 2015-12-04 | 2016-04-20 | 安徽工程大学 | Linear motor and optimization and verification method for improving operation efficiency of the same |
| CN106100284A (en) * | 2016-08-02 | 2016-11-09 | 武汉华大新型电机科技股份有限公司 | A kind of straight-line motion mechanism of permanent magnetic linear synchronous motor |
-
2015
- 2015-12-04 CN CN201521010406.4U patent/CN205160338U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515333A (en) * | 2015-12-04 | 2016-04-20 | 安徽工程大学 | Linear motor and optimization and verification method for improving operation efficiency of the same |
| CN106100284A (en) * | 2016-08-02 | 2016-11-09 | 武汉华大新型电机科技股份有限公司 | A kind of straight-line motion mechanism of permanent magnetic linear synchronous motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160413 Termination date: 20161204 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |