CN-121984300-A - Low-pulse vibration magnetic field bilateral linear motor with long primary stator in staggered segmentation mode

CN121984300ACN 121984300 ACN121984300 ACN 121984300ACN-121984300-A

Abstract

The invention discloses a low-pulse vibration magnetic field bilateral linear motor with a staggered and segmented primary stator structure, which relates to the technical field of linear motors, wherein a long primary stator comprises a plurality of stator segments, each stator segment adopts a bilateral structure and is respectively a left stator segment unit and a right stator segment unit, a secondary rotor is positioned between the long primary stators, and the left stator segment units and the right stator segment units of the plurality of stator segments are staggered in polar distance in the moving direction The currents of the double sided windings of each of the plurality of stator segments are uniform. The composite pulse vibration magnetic field in the air gap is effectively restrained through the staggered sectional design of the two sides of the long primary stator, the excitation power and the induced voltage unbalance degree of the motor are obviously reduced, and the power factor and the thrust output are improved.

Inventors

SHI LIMING
LI TIANPING
LIU JINHAI
LI YAOHUA
WANG PEILONG
WANG KE

Assignees

中国科学院电工研究所

Dates

Publication Date: 20260505
Application Date: 20260129

Claims (10)

1. A low pulse vibration magnetic field bilateral linear motor with a staggered and segmented long primary stator is characterized in that the long primary stator comprises a plurality of stator segments, each stator segment adopts a bilateral structure, a left stator segment unit and a right stator segment unit are respectively arranged, a secondary rotor is positioned between the long primary stators, and the left stator segment units and the right stator segment units of the plurality of stator segments are staggered in polar distance in the moving direction , wherein, For long primary stator pole distances, the currents of the double sided windings of each of the plurality of stator segments are uniform.
2. The long primary stator dislocation segmented low pulse vibration magnetic field bilateral linear motor as claimed in claim 1, wherein lengths of a left stator segment unit and a right stator segment unit in each stator segment of the long primary stator are equal, and pole pitches of the left stator segment unit and the right stator segment unit in each stator segment are mutually dislocation in a moving direction 。
3. The long primary stator misalignment segmented low pulse magnetic field double sided linear motor of claim 2 wherein the number of poles of the left stator segment unit and the right stator segment unit in each of the plurality of stator segments is even.
4. The low-pulse oscillating magnetic field bilateral linear motor with staggered and segmented long primary stator according to claim 1, wherein the lengths of the left unit and the right unit of the stator segment in each stator segment of the long primary stator are different, and the two ends of the short primary stator in each stator segment are respectively spaced from the two ends of the long primary stator by a polar distance The length of the short-side primary stator is different from that of the long-side primary stator by two pole pitches The stator segment right unit corresponding to the stator segment left unit is a long-side primary stator when the stator segment left unit is a short-side primary stator, and the stator segment right unit corresponding to the stator segment right unit is a short-side primary stator when the stator segment left unit is a long-side primary stator.
5. The long primary stator misalignment segmented low pulse magnetic field double sided linear motor of claim 4 wherein the number of poles of the left stator segment unit and the right stator segment unit in each of the plurality of stator segments is an odd number.
6. The low pulse oscillating magnetic field double sided linear motor of claim 3 or 5, wherein one of the plurality of stator segments generates a traveling wave magnetic field The method comprises the following steps: ; Wherein, the Is the magnetic permeability of the air, and the air is the air, Representing the sine-plane current excitation amplitude, , For the primary supply frequency, beta=pi/tau, For long primary stator pole distance, g e is equivalent air gap length, t is time variable, and two end coordinates of a left unit of a stator section and two end coordinates of a right unit of the stator section are set according to the size of a motion direction coordinate, and are sequentially x 1 、x 2 、x 3 、x 4 , wherein x 1 <x 2 <x 3 <x 4 .
7. The long primary stator misalignment segmented low pulse magnetic field bilateral linear motor of claim 1 wherein the stator segment left element windings of each of the plurality of stator segments are connected in series and the stator segment right element windings of each of the plurality of stator segments are connected in series.
8. The low pulse oscillating magnetic field double sided linear motor of claim 7, wherein adjacent stator segments in the direction of motion of the long primary stator are energized with the same current through the inverter, and the windings produce a uniform magnetic field in the air gap.
9. The low pulse oscillating magnetic field double sided linear motor of claim 8, wherein the secondary mover and the double sides of the long primary stator have equal air gaps therebetween.
10. The low pulse oscillating magnetic field double sided linear motor of claim 1, wherein the external power source supplies power to the stator segment corresponding to the secondary mover, and the total length of the power supply segment covers the total length of the secondary mover.

Description

Low-pulse vibration magnetic field bilateral linear motor with long primary stator in staggered segmentation mode Technical Field The invention relates to the technical field of linear motors, in particular to a low-pulse vibration magnetic field bilateral linear motor with a long primary stator in a staggered and segmented mode. Background Because the bilateral linear motor (especially the long primary bilateral linear induction motor) has the advantages of symmetrical structure, self-balancing normal force, high thrust density and the like, the motor is widely applied to occasions needing long-stroke and high-thrust linear driving, such as high-speed rail transit, electromagnetic ejection, precise material conveying and the like. To reduce the huge copper consumption and the power supply costs associated with long primary, the segmented power supply technique is the dominant solution, i.e. to energize only the primary stator segment of the area where the secondary mover is located. However, segmented powering introduces an inherent difficulty in longitudinal static end effects. When a primary stator of a certain section is energized, non-energized stator sections (usually magnetic conductive cores) at the two ends of the stator form a low reluctance path, so that the magnetic fields at the two ends of the energized section are distorted and leaked. The leakage magnetic field superimposes a pulse vibration bias magnetic field in an air gap inside the energizing section. The pulse vibration magnetic field can bring a series of serious influences, and specifically comprises (1) effective thrust is not generated, but air gap magnetic energy storage is increased, so that the power factor and the operation efficiency of a motor are obviously reduced, (2) symmetry of the air gap magnetic field is destroyed, induced electromotive force of each phase winding is seriously unbalanced, the current transformer is forced to design capacity according to the highest voltage/current phase, the system volume, the cost and the energy consumption are increased, and (3) current distribution is uneven, and the control complexity and the operation risk are increased under a parallel power supply mode. Disclosure of Invention The invention aims to provide a low-pulse vibration magnetic field bilateral linear motor with a long primary stator in a staggered and segmented mode, which is used for solving the problem that a strong pulse vibration magnetic field is generated due to a longitudinal static end effect in a segmented power supply bilateral linear motor. In order to achieve the above object, the present invention provides a low pulse oscillating magnetic field bilateral linear motor with a long primary stator, the long primary stator includes a plurality of stator segments, each stator segment adopts a bilateral structure, and is respectively a left stator segment unit and a right stator segment unit, a secondary rotor is located between the long primary stators, and the left stator segment unit and the right stator segment unit of the plurality of stator segments are offset in polar distance in the moving direction, wherein,For long primary stator pole distances, the currents of the double sided windings of each of the plurality of stator segments are uniform. Preferably, the lengths of the left stator segment unit and the right stator segment unit in each stator segment of the long primary stator are equal, and the left stator segment unit and the right stator segment unit in each stator segment are mutually staggered in the motion direction。 Preferably, the number of poles of the stator segment left unit and the stator segment right unit in each of the plurality of stator segments is an even number. Preferably, the lengths of the left unit and the right unit of the stator segment in each stator segment of the long primary stator are different, and the two ends of the short primary stator in each stator segment are respectively separated from the two ends of the long primary stator by a pole distanceThe length of the short-side primary stator is different from that of the long-side primary stator by two pole pitchesThe stator segment right unit corresponding to the stator segment left unit is a long-side primary stator when the stator segment left unit is a short-side primary stator, and the stator segment right unit corresponding to the stator segment right unit is a short-side primary stator when the stator segment left unit is a long-side primary stator. Preferably, the number of poles of the stator segment left unit and the stator segment right unit in each of the plurality of stator segments is an odd number. Preferably, a travelling wave magnetic field generated by one of the plurality of stator segmentsThe method comprises the following steps: ; Wherein, the Is the magnetic permeability of the air, and the air is the air,Representing the sine-plane current excitation amplitude,,For the primary supply frequency, be