CN103178687A - A Bilateral Mixed Excitation High Thrust Linear Synchronous Motor - Google Patents

Abstract

The invention discloses a bilateral mixed excitation type high-thrust linear synchronous motor. The bilateral mixed excitation type high-thrust linear synchronous motor comprises magnetic poles and armatures, wherein the armatures are arranged in two rows in a back-to-back manner; and the magnetic poles are arranged at two sides of the armatures. Each magnetic pole comprises a tooth-shaped back iron, an adjustable DC (Direct Current) exciting winding arranged between teeth of each back iron in an embedded manner, and a permanent magnet arranged on the teeth of each back iron. Each armature comprises two tooth-shaped armature iron cores which are arranged back to back; the back part of each armature iron core is provided with a cooling pipe groove; an armature winding is arranged between the teeth of the armature iron cores; the cooling pipe groove at the backside of each armature iron core is internally provided with a transverse cooling pipeline or a lengthways cooling pipeline. Each magnetic pole of the invention is provided with the permanent magnet and an electric exciting winding; an air-gap magnetic field is provided through the adoption of a mixed excitation way; and each armature is provided with an armature winding, the armature iron cores and cooling pipelines. As a double-row type staggered assembling structure is adopted by the armatures in the invention, the side end effect is reduced; as a built-in cooling structure is adopted by the armatures adopt, thrust density is improved; and as the mixed excitation structure is adopted by the magnetic poles, the air-gap magnetic field is flexible and adjustable.

Description

A Bilateral Mixed Excitation High Thrust Linear Synchronous Motor

technical field

The invention relates to a bilateral mixed excitation type high-thrust linear synchronous motor.

Background technique

Compared with the linear induction motor, the permanent magnet linear synchronous motor has the advantage of high thrust density, but the disadvantage of large thrust fluctuation. The high-thrust linear synchronous motors currently used in high-speed CNC machine tools are all permanent magnet structures. In order to further increase the thrust and overcome the shortcomings of large thrust fluctuations, the bilateral cooling structure is an optional structure. In the large-thrust permanent magnet linear motors retrieved so far, the permanent magnets are basically surface-mounted unilateral structures. The permanent magnets are installed on the back iron as the long stator, and the armature winding is embedded in the laminated iron core as the mover. The system exists There is a large edge force, and the mover has a large unilateral normal force.

Contents of the invention

The invention provides a double-sided hybrid excitation high-thrust linear synchronous motor, which is suitable for high-speed numerical control beds, linear conveying devices, linear test platforms and other applications that require high stability and large thrust, and solves the problem of side-end force in current permanent magnet linear synchronous motors. , The air gap magnetic field is difficult to adjust, and the thrust density is not high.

In order to achieve the above object, the present invention provides a double-sided hybrid excitation high-thrust linear synchronous motor. The linear synchronous motor includes magnetic poles and armatures, and the magnetic poles are arranged on both sides of the armature.

The magnetic poles include toothed back irons, adjustable DC excitation windings embedded between the teeth of the back irons, and permanent magnets arranged on the back iron teeth.

Adjacent permanent magnets are opposite in polarity.

The armature includes two tooth-shaped armature cores arranged in the opposite direction, a number of cooling pipe slots are arranged on the back of the armature core, and the armature also includes armature windings arranged between the teeth of the armature core , and the cooling pipe arranged in the cooling pipe groove on the back of the armature core.

The cooling medium in the cooling pipe in the back cooling pipe groove can be water, or oil, or a gas-liquid mixed medium, or just open air passages.

The back cooling pipe slots can be arranged horizontally or vertically.

Both the magnetic poles and the armature can be used as movers.

When the magnetic pole is used as the mover, the armature is used as the stator, and the dislocation length of the magnetic poles on both sides is l, and the range of l is 0~1/2 times of the pole pitch of the magnetic pole. Pivot core dislocation length l, the range of l is 0~1/2 times of the magnetic pole pitch.

According to needs, such as in high-thrust occasions, a cooling system is also installed on the magnetic poles.

Permanent magnets and electric excitation windings are installed on the magnetic poles of the present invention, and the air gap magnetic field is provided by a mixed excitation method. Armature windings, armature cores and cooling pipes are installed on the armature, which is different from the existing moving armature type permanent magnet type. Compared with the structure, the armature of the present invention adopts a double-row dislocation assembly structure, which reduces the edge effect. The armature adopts a built-in cooling structure, which improves the thrust density. The magnetic pole adopts a hybrid excitation structure, which makes the air gap magnetic field flexible and adjustable.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural representation of the present invention;

Fig. 3 is the installation schematic diagram of the present invention;

Fig. 4 is a schematic structural diagram of an armature in the present invention.

Detailed ways

A preferred embodiment of the present invention will be specifically described below with reference to FIGS. 1 to 4 .

The present invention provides a double-sided hybrid excitation high-thrust linear synchronous motor, which includes a magnetic pole 1 and an armature 2. The armature is in the form of double-sided back-to-back, and the double-sided magnetic pole 1 is arranged on both sides of the armature 2.

The magnetic pole 1 includes a toothed back iron 1-3, an adjustable DC field winding 1-2 embedded between the teeth of the back iron 1-3, and a permanent magnet 1-1 arranged on the teeth of the back iron 1-3 . Adjacent permanent magnets 1-1 have opposite polarities.

As shown in FIG. 4 , the armature 2 includes two toothed armature cores 2 - 3 facing away from each other, and several cooling pipe slots are arranged on the back of the armature cores 2 - 3 . The armature 2 also includes an armature winding 2-1 arranged between the teeth of the armature iron core 2-3, and a horizontal cooling pipe 2-2 arranged in the cooling pipe groove at the back of the armature iron core 2-3, greatly Increase the current density. The cooling medium can be water, or oil, or a gas-liquid mixed medium, provided by an external cooling system. It is also possible to only open the ventilation channel.

Both the magnetic pole 1 and the armature 2 can be used as movers. When the magnetic pole 1 is used as a mover, the armature 2 is used as a stator. The dislocation length of the magnetic poles on both sides is l, and the range of l is 0~1/2 times of the pole pitch of the magnetic poles. When the armature 2 is used as the mover, the magnetic pole 2 is used as the stator, and the double-row toothed armature iron core 2-3 has a dislocation length l, and the range of l is 0~1/2 times of the pole pitch of the magnetic poles.

The mover is generally an armature, but it can also be a magnetic pole. When moving the armature, the cooling pipe is installed on the armature because the main loss of the motor is generated on the armature. According to the need, such as in high-thrust occasions, the cooling system can also be added to the magnetic pole part.

The working principle of the present invention: the permanent magnet 1-1 and the armature winding 2-1 jointly provide an adjustable air gap magnetic field, and the corresponding three-phase alternating current is passed into the armature winding 2-1 to generate electromagnetic thrust and drive the mover run. The movers are staggered by a certain position l, so that the side-end effects on both sides cancel each other out. Therefore, the advantages of the motor of the present invention are that the side-end effects are small, the movers have no unilateral normal force, the thrust is large, and the adjustment is flexible.

As shown in Figure 1, it is the first embodiment of the lateral cooling type bilateral hybrid excitation linear synchronous motor of the present invention. In this embodiment, the mover is the armature 2, the stator is the magnetic pole 1, and the armature core 2-3 adopts The double-row structure is staggered at a certain position l during assembly, and the horizontal water-cooling pipeline 2-2 is sandwiched between the double-row armature iron cores 2-3. The output hose of the external pump is connected to the middle pipe interface of the cooling pipe 2-2 to provide cooling medium, and its tightness is guaranteed during connection. The connection hose is installed on the drag chain. The energy loss in this motor mainly occurs in the armature part, and the cooling system (cooling pipe 2-2, external pump, output hose, cooling medium and drag chain, etc.) is installed on the armature. , a cooling system can also be added to the pole part. The efficiency of the motor is higher when the armature is moved, but there are moving cables and cooling pipes in the mover part, and drag chains need to be installed.

When the three-phase symmetrical alternating current of the required frequency is passed into the armature core of the mover, the armature magnetic field is generated, which interacts with the air gap magnetic field provided by the stator poles to generate electromagnetic thrust to drive the mover forward. The cooling system in the mover quickly takes away the heat, and the armature current density is high, so the thrust density increases; if the motor does not heat up badly, only opening the ventilation slot can also improve the heat dissipation effect; the ends of the mover core are misaligned by l length, The edge effect is offset as much as possible, so the thrust fluctuation is small; when the adjustable DC excitation winding current is zero, only the permanent magnet provides the air gap flux, which is equivalent to the permanent magnet linear synchronous motor; when the adjustable DC excitation winding current is negative , it plays the role of magnetic field weakening and speed expansion.

Fig. 2 is the second embodiment of the bilateral hybrid excitation type linear synchronous motor of the present invention. In this embodiment, the mover is the magnetic pole 1, the stator is the armature 2, and the magnetic poles 1 on both sides are installed on the same mobile platform 5. At this time, the magnetic poles on both sides are misaligned by a length l, so that the edge force on both sides can be offset as much as possible. The mover pole is mainly used in high-speed and long-stroke. Its advantage is that the mover pole is excited by a low-power DC power supply, and no external cables are needed. However, segmented power supply technology is required to improve efficiency.

As shown in Figure 3, the mover of the bilateral hybrid excitation linear synchronous motor is an armature, and when it is applied to a linear motion occasion, the mover 2 is installed on the mobile platform 5, and the stator 1 is installed on the fixed platform 3. The constant air gap is maintained through the linear guide rail 4, and the corresponding armature current and excitation current are controlled according to the operation requirements of the equipment. At low speed, the adjustable DC excitation current is zero, and it is used as a permanent magnet linear motor; at high speed, the adjustable DC excitation current is negative, which plays the role of field weakening and speed expansion. Compared with the permanent magnet linear synchronous motor in the existing literature, the advantages of this cooling type bilateral hybrid excitation linear synchronous motor are very prominent. The mover has a built-in cooling pipe. Excitation mode, so the thrust generated is large, the fluctuation is small, the speed range is wide, and the armature is unable to force. the

The accompanying drawings of the present invention are in the form of a short armature, and the loss generated is mainly in the armature part, so the armature needs to be cooled, which can increase the thrust density by about 2-3 times; a cooling system can also be added to the magnetic pole part to better improve Thrust density and efficiency.

The excitation adopts the hybrid excitation structure, and the magnetic field is provided by the permanent magnet and the electric excitation. The magnetic flux provided by the permanent magnet is about twice that of the electric excitation. There is no DC excitation during constant torque operation, and it provides a field-weakening current during field-weakening control.

The armature iron core adopts a double-row structure, with cooling pipe grooves on the back, and dislocation assembly makes the end of the iron core stagger a certain position l, reducing the end force and force fluctuation.

The armature adopts a double-sided cooling structure, and the armature core has built-in horizontal or vertical cooling pipes.

The invention adopts bilateral cooling structure, dislocation of armature iron core end, and adopts electromagnetic permanent magnet double excitation mode, which is different from the current permanent magnet linear synchronous motor structure, and its outstanding features are large thrust, small thrust fluctuation, and magnetic field adjustment convenient. The present invention is a preferred scheme of a permanent magnet linear synchronous motor, which is suitable for high-speed numerical control processing machine tools, industrial transportation and other high-stable and large-thrust linear motion occasions.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the above disclosure. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (8)

1. A double-sided hybrid excitation high-thrust linear synchronous motor, characterized in that the linear synchronous motor includes a magnetic pole (1) and an armature (2), and the armature is a double-sided back-to-back form, and the double-sided magnetic pole (1) is set on both sides of the armature (2). 2. The double-sided hybrid excitation high-thrust linear synchronous motor according to claim 1, characterized in that, the magnetic pole (1) includes a toothed back iron (1-3), which is embedded in the back iron (1-3 ) adjustable DC excitation windings (1-2) between the teeth, and permanent magnets (1-1) set on the teeth of the back iron (1-3). 3. The double-sided hybrid excitation type high-thrust linear synchronous motor according to claim 2, characterized in that, the armature (2) includes two toothed armature cores (2-3) arranged in the opposite direction, The back of the armature core (2-3) is provided with several cooling pipe slots, and the armature (2) also includes an armature winding (2-1) arranged between the teeth of the armature core (2-3), And the cooling pipe (2-2) arranged in the cooling pipe slot on the back of the armature core (2-3). 4. The bilateral hybrid excitation high-thrust linear synchronous motor according to claim 3, characterized in that the cooling medium in the cooling pipe (2-2) in the cooling pipe groove on the back of the armature core (2-3) It is water, or oil, or a mixed medium of gas and liquid, or just open the air channel. 5. The double-sided hybrid excitation type high-thrust linear synchronous motor according to claim 3, characterized in that the cooling pipe grooves on the back of the armature core (2-3) are arranged horizontally or vertically. 6. The double-sided hybrid excitation high-thrust linear synchronous motor according to claim 3, characterized in that both the magnetic pole (1) and the armature (2) can be used as movers. 7. The double-sided hybrid excitation type high-thrust linear synchronous motor according to claim 3, characterized in that when the magnetic pole (1) is used as the mover, the armature (2) is used as the stator, and the magnetic poles on both sides are misaligned with a length l, l range It is 0~1/2 times of the magnetic pole pitch. When the armature (2) is used as the mover, the magnetic pole (2) is used as the stator, and the double-row toothed armature core (2-3) has a dislocation length l, and the range of l is 0~1/2 times of the magnetic pole pitch. 8. The double-sided hybrid excitation high-thrust linear synchronous motor according to claim 5, characterized in that a cooling pipeline system is also arranged on the magnetic pole (1).

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