CN217087744U - Linear motor - Google Patents

Abstract

The utility model discloses a linear electric motor, including primary module and secondary module. The primary module comprises an iron core and a plurality of windings, wherein the iron core is provided with a plurality of stator teeth protruding towards the iron core, and the stator teeth are arranged at intervals. A plurality of windings are arranged on the stator teeth, and the secondary module and the primary module are arranged oppositely and comprise steel plates, aluminum plates and supporting frames. Aluminum plate is equipped with the recess of a plurality of interval arrangements, and the steel sheet is equipped with a plurality of sand grips, and every sand grip is located every recess, and the steel sheet is kept away from one side of sand grip and is connected in the support frame. Compared with the prior art, the utility model discloses a linear electric motor adopts the secondary module of grid formula, has reduced the width in electromagnetic gap between secondary module and the primary module, can produce bigger electromagnetic drive power. In addition the utility model discloses an aluminum plate adopts forged processing mode, and the steel sheet adopts cast processing mode, and the cost is low, practices thrift the cost.

Description

Linear motor

Technical Field

The utility model relates to the technical field of motors, concretely relates to linear electric motor.

Background

The linear motor can be classified into a permanent magnet synchronous linear motor and an induction asynchronous linear motor. The most outstanding defects of the permanent magnet synchronous driving mode are that the price of permanent magnet materials is high, and the manufacturing cost of the motor is high. Although the driving mode of the induction asynchronous motor has lower cost, the electromagnetic gap is larger, and the thrust is smaller. To the above problem, the utility model provides a linear electric motor that thrust is great for elevator.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a linear electric motor to solve the problem that exists among the above-mentioned prior art.

In order to solve the above problem, according to an aspect of the present invention, there is provided a linear motor, including:

the primary module comprises an iron core and a plurality of windings, the iron core extends along a first direction and is provided with a plurality of stator teeth, and the stator teeth are arranged at intervals along the first direction; the plurality of windings are wound on the stator teeth in a certain sequence; the second direction is perpendicular to the first direction; and

the secondary module and the primary module are oppositely arranged and comprise steel plates, aluminum plates and supporting frames, and the steel plates and the aluminum plates extend along the first direction; the steel plate is arranged on the support frame, and one side of the steel plate, which is far away from the support frame, is provided with a plurality of convex strips protruding towards the direction of the iron core; aluminum plate extends and is equipped with a plurality of recesses along vertical direction, and is a plurality of the recess is followed vertical direction interval arrangement, aluminum plate connect in the steel sheet is close to one side of iron core, just the sand grip is located in the recess. In one embodiment, the distance between two adjacent grooves is 10 mm.

In one embodiment, the width of the groove is 10 mm.

In one embodiment, the depth of the groove is 13 mm.

In one embodiment, the material of the iron core is carbon structural steel.

In one embodiment, the length of the groove in the second direction ranges from 180mm to 220 mm.

In one embodiment, the support frame extends along a first direction, the support frame is provided with a mounting groove extending along the first direction, the steel plate is positioned in the mounting groove, and one side, away from the convex strip, of the steel plate is close to the bottom of the mounting groove.

In one embodiment, the ribs are located within and extend beyond the grooves.

In one embodiment, the aluminum plate is formed by forging and the steel plate is formed by casting.

Compared with the prior art, the utility model discloses a linear electric motor adopts the secondary module of grid formula, has reduced the electromagnetic gap width between secondary module and the primary module, can produce bigger electromagnetic drive power. In addition the utility model discloses an aluminum plate adopts cast processing mode, and the steel sheet adopts forged processing mode, and the cost is low, practices thrift the cost.

Drawings

Fig. 1 is a schematic view of a linear motor according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a secondary module of an embodiment of the invention along a first direction.

Fig. 3 is a top view of a secondary module in an embodiment of the invention.

Fig. 4 is a schematic view of an elevator according to an embodiment of the present invention.

Fig. 5 is a schematic view of an elevator in an embodiment of the invention from different angles.

Reference numerals: 100. a linear motor; 1. an iron core; 11. stator teeth; 2. a secondary module; 21. an aluminum plate; 211. a groove; 22. a steel plate; 221. a convex strip; 200. an elevator; 201. a hoistway; 202. a car.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation.

The present invention relates to a linear motor 100, as shown in fig. 1, the linear motor 100 includes a primary module and a secondary module 2.

The primary module includes a core 1 and a plurality of windings (not shown), the plurality of windings are used for supplying three-phase current to form a constantly changing magnetic field, and the core 1 is used for reinforcing the strength of the magnetic field formed by the plurality of windings.

A plurality of windings are wound around the core 1 according to a certain rule. Specifically, the iron core 1 extends along a first direction to form an elongated flat plate, one side of the iron core 1 is provided with a plurality of stator teeth 11 protruding towards a second direction, the second direction is perpendicular to the first direction, and the second direction is the width direction of the iron core 1. The plurality of stator teeth 11 are arranged at intervals in the first direction. A plurality of windings are wound around the stator teeth 11 in a certain order. In practice, three-phase or multi-phase current is input to the plurality of windings, and the plurality of windings can generate a variable magnetic field, and the variable magnetic field can enable the secondary module 2 to generate current.

The secondary module 2 and the primary module are oppositely disposed and include a steel plate 22, an aluminum plate 21, and a support bracket (not shown) as shown in fig. 1, 2, and 3, the steel plate 22, the aluminum plate 21, and the support bracket extending in a first direction. The aluminum plate 21 is provided with a plurality of grooves 211 extending in the second direction, and the plurality of grooves 211 are arranged at intervals in the first direction. The steel plate 22 is provided with a plurality of protruding strips 221 extending along the second direction, each protruding strip 221 is located in each groove 211, and one side of the steel plate 22 away from the protruding strips 221 is connected to the support frame.

The aluminum plate 21 has good conductivity, can induce a changing magnetic field to generate a changing current, the changing current generates an induced magnetic field, and the speed of the primary module can be changed by changing the current changing speed of the winding. The protruding strips 221 on the steel plate 22 are close to the iron core 1, so that the magnetic field of the stimulation module can be enhanced, the width of an air gap between the primary module and the secondary module 2 is reduced, the phenomenon of magnetic flux leakage of the linear motor 100 is avoided, and the efficacy of the linear motor 100 is improved.

The plurality of grooves 211 on the aluminum plate 21 are arranged along the first direction to form a grid, the distance c between two adjacent grooves 211 on the aluminum plate 21 ranges from 10mm, the width a of the groove 211 ranges from 10mm, the depth b of the groove 211 ranges from 13mm, and the length d of the groove 211 along the second direction ranges from 180mm to 220 mm. The specific numerical value is determined according to different loads and primary pole distances, so that the optimal effect is achieved.

In the embodiment shown in fig. 4, the width of the concave groove 211 is 10mm, the depth b is 10mm, the distance c between two adjacent concave grooves 211 is 10mm, the length d of the concave groove 211 in the second direction is 200mm, the number of the concave grooves 211 is 50, and the total length e of the steel plate 22 is 10000 mm.

The air gap formed between the primary and secondary modules 2 ranges from 2mm to 4 mm. The air gap refers to the gap between the stationary magnetic pole and the rotating armature, the size of the air gap determines the size of the magnetic flux, and the larger the air gap, the more the magnetic flux leakage, and the lower the efficiency of the motor. The primary module generates a varying magnetic field by varying current in the windings, so that the aluminum plate 21 generates an induced magnetic field, which is reinforced by the protruding strips 221 of the steel plate 22. And the utility model discloses a sand grip 221 passes aluminum plate 21's recess 211, is close to primary module's magnetic field further for the air gap between primary module and the secondary module 2 diminishes, makes linear electric motor 100's efficiency increase.

Preferably, the protruding strips 221 are located in the grooves 211 and extend beyond the grooves 211. The ribs 221 protrude from the aluminum plate 21 to be closer to the primary module, which further reduces the air gap between the primary module and the secondary module 2.

In addition, the material of the iron core 1 is carbon structural steel or silicon steel sheet, preferably carbon structural steel, and the carbon structural steel shell is conductive, has good mechanical property and is low in price.

The material of the aluminum plate 21 is commercially pure aluminum and can be formed by forging. The steel plate 22 is made of a common carbon structural steel and may be formed by casting.

The support frame extends along the first direction, and the support frame is equipped with the mounting groove that extends along the first direction, and steel sheet 22 is located the mounting groove, and one side that steel sheet 22 kept away from sand grip 221 is close to the bottom of mounting groove. The support bracket may allow the secondary module 2 to be fixed and the primary module to be moved relative to the secondary module 2 when the windings are energised.

In addition, the bottom of the mounting groove of the support frame is provided with a plurality of threaded holes, the bottom of the steel plate 22 is also provided with a plurality of threaded holes, and the steel plate can be fixed in the mounting groove through screws.

Compared with the prior art, the utility model discloses a linear electric motor 100 adopts the secondary module of grid formula, has reduced the electromagnetic gap width between secondary module and the primary module, can produce bigger electromagnetic drive power. In addition the utility model discloses an aluminum plate 21 adopts cast processing mode, and steel sheet 22 adopts forged processing mode, and the cost is low, practices thrift the cost.

The utility model discloses a secondary module 2 processing method of linear electric motor 100, including the step:

s1, providing a steel plate 22, wherein the steel plate 22 extends along a first direction and is provided with a plurality of convex strips 221, the convex strips 221 extend along a second direction and are arranged at intervals along the first direction, and the second direction is perpendicular to the first direction; the steel plate 22 is further provided with a frame in the circumferential direction, and the plurality of convex strips 221 are located in the frame.

And S2, injecting a certain amount of molten aluminum into the frame so that the frame is filled with the molten aluminum. The cooled aluminum plate 21 is placed on the steel plate 22 to form the grid-type secondary module 2.

In the grid type secondary module 2 in the prior art, generally, the cold plate or the steel plate 22 is provided with the groove 211 and the convex strip 221, and then the convex strip 221 is clamped in the groove 211, because the secondary module 2 is longer, and the dimensions of the convex strip 221 and the groove 211 are smaller, the operation is difficult, time and labor are consumed, and the operation is very inconvenient. Compared with the prior art, the utility model discloses a secondary module 2 processing method is fairly simple, can batch production. In practical operation, when a longer secondary module 2 needs to be produced, the method takes the limitation of mold opening into consideration, and the sectional production is that a plurality of sections of shorter steel plates 22 and aluminum plates 21 are produced by the method, and then each section of steel plate 22 is welded.

The linear motor of the present invention can be used in an elevator 200, as shown in fig. 4 and 5, the elevator 200 includes a hoistway 201, a car 202, and the linear motor 100.

Specifically, the hoistway 201 is a passage extending in the vertical direction, and the cross section of the hoistway 201 in the horizontal direction is rectangular. The car 202 is rectangular and is located in the hoistway 201, and the car 202 is slidably connected to an inner wall of the hoistway 201. Specifically, a slide rail extending in the vertical direction may be provided on the hoistway 201, a slide block in which the slide rail may be embedded may be provided on the car 202, and the car 202 may slide along the hoistway 201 through the cooperation of the slide block and the slide rail. A slide block extending in the vertical direction may be provided in the hoistway 201, and a slide rail may be provided in the car 202, so that the car 202 and the hoistway 201 can be slidably connected.

The primary modules of the linear motor 100 are mounted on opposite sides of the car 202. The secondary modules 2 are mounted on opposite sides of the hoistway 201 and extend from the bottom to the top of the hoistway 201, with the primary and secondary modules 2 being disposed opposite one another. As shown in fig. 4 and 5, the iron cores 1 of the primary module are two and are respectively installed at opposite sides of the car 202, and the iron cores 1 extend in a vertical direction. A plurality of stator teeth 11 are located on a side close to the car 202 and are arranged at intervals in the vertical direction. A plurality of windings are wound around the stator teeth 11 in a certain order.

The secondary module 2 is arranged opposite to the primary module. The support frame of the secondary module 2 is mounted on the inner wall of the hoistway 201 and extends in the vertical direction. The steel plate 22 is mounted on the support frame, the plurality of protruding strips 221 are located at one side close to the iron core 1, and the plurality of protruding strips 221 are arranged at intervals in the vertical direction. Aluminum plate 21 is mounted on steel plate 22 on the side closer to core 1.

In addition, the convex strip 221 is positioned in the groove 211 and extends beyond the groove 211, and the convex strip 221 extends beyond the groove 211 towards the iron core 1, so that on one hand, the air gap between the primary module and the secondary module 2 can be reduced, and on the other hand, the convex strip can also be used as a baffle plate of an emergency stop device of the elevator 200. Specifically, the emergency stop device comprises a sensing device, an insertion rod and a driving device, wherein the sensing device is arranged in the car 202 and used for sensing the running condition of the elevator 200. The inserted bar is installed at the bottom of the car 202 and is operatively inserted into the protruding strips 221 on both sides of the hoistway 201, the inserted bar is arranged along the horizontal direction, and in case of emergency, the inserted bar can extend out of the protruding strips 221 on both sides of the car 202 inserted into the hoistway 201, so that the elevator 200 can be braked emergently. The driving means is used to drive the plunger to be inserted into the protrusion 221. It will be appreciated that the elevator 200 also includes a control module, with the drive means and the sensing means being in signal communication with the control module. In practical application, if the elevator 200 is sensed to be in poor operation, a signal is sent to the control module, the control module sends an instruction to the driving device after receiving the signal, and the driving device drives the inserted bar to extend out of the car 202 and clamp the inserted bar into the protruding bar 221, so that the elevator 200 stops moving. In practical application, when the elevator is electrified, the electromagnet can compress the spring, the emergency stop device does not work, the inserted link is provided with a tooth socket, and the spring can fix the tooth socket of the inserted link in the car; when the elevator is powered off, the electromagnet loses magnetism, the spring pops the inserted bar, and the two ends of the inserted bar are clamped by the convex strips of the secondary module of the linear motor due to the gravity of the car, so that the emergency braking function is realized.

Alternatively, the secondary module 2 may be mounted on the car 202, the primary module may be mounted in the hoistway 201, and the car 202 may be driven to move in the same manner.

The utility model discloses an elevator 200 adopts linear electric motor 100, and linear electric motor 100's secondary module 2 adopts the design of grid formula for air gap between primary module and the secondary module 2 reduces, has great drive power, can the motion of direct drive car 202, reduces the waste of magnetic leakage and the energy, has increased elevator 200's availability factor.

The utility model discloses a linear electric motor 100 can directly turn into linear motion's kinetic energy with the electric energy, does not need the transmission of any middle shifter, has advantages such as system is small, low noise, start that thrust is big, dynamic response is fast. The utility model discloses an elevator 200 is with primary module direct mount on car 202, and secondary module installs in 201 inner walls of well, through primary module and the motion of secondary module drive car 202, need not be according to the counter weight, and elevator 200's occupation space is little. And the utility model discloses an elevator 200 also need not dispose rope sheave, telescopic link or other parts, avoids elevator 200 to break down because rope sheave or telescopic link are ageing, improves elevator 200's security, moreover the utility model discloses an elevator 200 is efficient, drive power is big, the energy consumption is little, environmental protection and energy saving.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims (9)

1. A linear motor, comprising:

the primary module comprises an iron core and a plurality of windings, the iron core extends along a first direction, a plurality of stator teeth are arranged on one side of the iron core, and the stator teeth are arranged at intervals along the first direction; the plurality of windings are wound on the stator teeth; and

the secondary module and the primary module are oppositely arranged and comprise steel plates, aluminum plates and supporting frames, and the steel plates and the aluminum plates extend along the first direction; the steel plate is arranged on the support frame, and one side of the steel plate, which is far away from the support frame, is provided with a plurality of convex strips protruding towards the direction of the iron core; aluminum plate extends and is equipped with a plurality of recesses along vertical direction, and is a plurality of the recess is followed vertical direction interval arrangement, aluminum plate connect in the steel sheet is close to one side of iron core, just the sand grip is located in the recess.

2. A linear motor according to claim 1, wherein the pitch between two adjacent grooves is 10 mm.

3. A linear motor according to claim 1, the slot having a width of 10 mm.

4. A linear motor according to claim 1, the grooves having a depth of 13 mm.

5. The linear motor of claim 1, wherein the core is made of carbon structural steel.

6. A linear motor according to claim 1, wherein the length of the groove in a second direction perpendicular to the first direction is in the range 180mm to 220 mm.

7. The linear motor of claim 1, wherein the support frame extends in a first direction, and the support frame is provided with a mounting groove extending in the first direction, the steel plate is located in the mounting groove, and a side of the steel plate away from the protruding strip is close to the bottom of the mounting groove.

8. The linear motor of claim 1, wherein the ribs are located within the grooves and extend beyond the grooves.

9. The linear motor of claim 1, wherein the aluminum plate is formed by forging and the steel plate is formed by casting.

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