A moving magnet linear motor with good heat dissipation effect
By introducing a combination of a heat spreader and a thermoelectric cooling element into the moving magnet linear motor, the performance and accuracy problems caused by uneven heat dissipation are solved, and the motor achieves efficient heat dissipation and stable operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DEMAT INTELLIGENT EQUIP (SUZHOU) CO LTD
- Filing Date
- 2025-09-08
- Publication Date
- 2026-07-14
AI Technical Summary
Moving magnet linear motors suffer from performance degradation and reduced accuracy due to uneven heat dissipation during operation, especially overheating of specific phase coil windings when the mover is stationary or at low speeds.
The system employs a combination of a heat spreader and thermoelectric cooling elements. The heat spreader transfers heat from the motor stator to the thermoelectric cooling elements, which then rapidly dissipate the heat. Combined with a radiator and a fan, the heat dissipation effect is further enhanced, ensuring the temperature uniformity of the motor stator.
This effectively prevents localized overheating of the motor stator, maintains good working performance and motion accuracy, and improves the stability and reliability of the motor.
Smart Images
Figure CN224503105U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a moving magnet linear motor with good heat dissipation. Background Technology
[0002] A moving-magnet linear motor is a type of linear motor in which a permanent magnet is mounted on the mover, while the stator consists of fixed coil windings. When energized, the magnetic field generated by the coil windings interacts with the permanent magnet, propelling the mover in linear motion. Due to the relatively large mass of the permanent magnet in the mover, moving-magnet linear motors are particularly suitable for applications requiring high thrust and long stroke, such as machine tool feed systems.
[0003] As is well known, when a linear motor moves at a constant speed, the mover passes over all the stator coils on the stator at a constant speed, and the heat is evenly distributed on the stator coils. However, when the motor is in a holding state or at low speed / variable speed, the mover needs to stay in a fixed position on the stator, or the load is applied to a specific phase of the coil among multiple coils. This causes the coil of the specific phase to bear an excessive load for a long time, resulting in concentrated heat generation and an increase in the peak temperature of the linear motor. This leads to a decrease in the thrust of the linear motor, affecting its performance. In fact, local overheating can also affect the accuracy of the linear motor and reduce its stability and reliability. Utility Model Content
[0004] The present invention aims to at least solve the technical problem of uneven heat dissipation leading to decreased performance and accuracy in existing moving magnet linear motors, and proposes a moving magnet linear motor with good heat dissipation effect.
[0005] This utility model proposes a moving magnet linear motor with good heat dissipation effect, comprising: a mounting base with an internal cavity, and an elongated through slot on the upper surface of the mounting base communicating with the cavity; a movable base slidably connected to the upper surface of the mounting base; a motor mover and a motor stator disposed in the cavity, the motor mover including a magnetic rail mounting plate fixedly connected to the movable base through the through slot and a magnetic rail fixed to the side of the magnetic rail mounting plate, the motor stator including a coil winding disposed opposite to the magnetic rail; and a heat dissipation plate and a thermoelectric cooling plate, the thermoelectric cooling plate being fixed on the mounting base, the heat dissipation surface of the thermoelectric cooling plate being located on the outer side of the mounting base, the cooling surface of the thermoelectric cooling plate being located in the cavity, and the cooling surface abutting against the motor stator through the heat dissipation plate.
[0006] In some preferred embodiments, the projection of the motor stator onto the linear motion trajectory plane of the motor mover is located within the corresponding projection range of the heat spreader.
[0007] In some preferred embodiments, the heat spreader is a thermally conductive silicone sheet.
[0008] In some preferred embodiments, the motor stator is also provided with cooling channels.
[0009] In some preferred embodiments, a heat sink is also provided on the outer side of the mounting base, and the heat sink is connected to the heat dissipation surface of the thermoelectric cooling chip; a cooling fan is provided on the heat sink.
[0010] In some preferred embodiments, magnetic rails are provided on two opposite sides of the magnetic rail mounting plate, and motor stators are provided on two opposite sides of the motor mover.
[0011] In some preferred embodiments, a plurality of heat dissipation grooves are provided at the upper end of the magnetic track mounting plate.
[0012] In some preferred embodiments, a sliding fit structure is provided between the upper surfaces of the movable seat and the mounting seat. The sliding fit structure is a slide rail structure or an air flotation structure.
[0013] In some preferred embodiments, the moving magnet linear motor further includes a protective structure that shields the through slot.
[0014] In some preferred embodiments, the protective structure includes: U-shaped guide plates respectively provided on two opposite sides of the through groove, the end length of the U-shaped guide plates extending beyond the end of the through groove, and a movable seat straddling the two U-shaped guide plates; end side plates respectively provided between the ends of the two U-shaped guide plates, and a bellows cover connected between the end side plates and the movable seat, the two sides of the bellows cover being located inside the two U-shaped guide plates respectively.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] This utility model has a simple overall structure and low implementation cost. Specifically, it sets up a heat dissipation plate and a thermoelectric cooling plate between the motor stator and the mounting base. The cooling surface of the thermoelectric cooling plate abuts against the motor stator through the heat dissipation plate. During operation, the heat generated by specific coil windings of the motor stator is quickly transferred to the thermoelectric cooling plate through the heat dissipation plate, and then quickly dissipated to the outside by the thermoelectric cooling plate. This avoids the peak temperature rise and local overheating expansion of the moving magnet linear motor during operation, which would affect the motion accuracy. Therefore, it helps to ensure that the linear motor maintains better working performance and higher motion accuracy. Attached Figure Description
[0017] Figure 1 This is a three-dimensional structural schematic diagram of the moving magnet linear motor of this application.
[0018] Figure 2 This is a three-dimensional exploded structural diagram of one embodiment of the motor actuator.
[0019] Figure 3 This is a schematic diagram of the structure in which the magnetic track mounting plate and the movable base are fixedly connected.
[0020] Figure 4 This is a schematic diagram of the internal structure of one embodiment of the moving magnet linear motor of this application.
[0021] The labels in the diagram have the following meanings: 1-Mounting base, 11-Cavity, 12-Through groove, 13-U-shaped guide plate, 14-End side plate, 15-Bell bellows cover, 2-Moving base, 3-Motor mover, 31-Magnetic rail mounting plate, 311-Heat dissipation groove, 32-Magnetic rail, 4-Motor stator, 5-Heat spreader plate, 6-Thermoelectric cooling element, 7-Radiator, 81-Slide rail, 82-Sliding base. Detailed Implementation
[0022] To further illustrate the technical means and effects adopted by this application to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.
[0023] Combination Figures 1-4 As shown, this utility model discloses a moving-magnet linear motor (hereinafter referred to as "linear motor") with good heat dissipation effect, including a mounting base 1 with a cavity 11, a movable base 2 slidably connected to the upper surface of the mounting base 1, a motor mover 3 and a motor stator 4 disposed in the cavity. The motor mover 3 includes a magnetic rail mounting plate 31 fixedly connected to the movable base 2 and a magnetic rail 32 fixed to the side of the magnetic rail mounting plate 31; the motor stator 4 is fixed in the cavity of the mounting base 1, and the motor stator 4 includes a coil winding disposed opposite to the magnetic rail 32. When energized, the magnetic field generated by the coil winding of the motor stator 4 interacts with the magnetic rail 32 of the motor mover 3, driving the motor mover 3 to move linearly relative to the motor stator 4.
[0024] A long, narrow groove 12 communicating with the cavity 11 is provided on the upper surface of the mounting base 1. The magnetic track mounting plate 31 is located inside the cavity, and its upper end passes through the groove and is fixedly connected to the movable base 2. The workpiece or material driven by the linear motor is fixed on the movable base 2. The motor mover 3 drives the movable base 2 to move linearly relative to the mounting base 1 along the length of the groove 12 as needed, thereby transporting the workpiece or material to the required position in a linear motion as needed.
[0025] To address the technical problem of peak temperature rise affecting motor performance and accuracy caused by the coil windings of a specific phase bearing excessive load and generating concentrated heat during operation, the linear motor also includes a heat spreader 5 and a thermoelectric cooling plate 6. Specifically, the opposite sides of the thermoelectric cooling plate 6 are a cooling surface and a heat dissipation surface, respectively. The thermoelectric cooling plate 6 is fixed to the mounting base 1, with the heat dissipation surface located on the outer side of the mounting base 1, while the cooling surface is located inside the cavity of the mounting base 1; the cooling surface abuts against the motor stator 4 through the heat spreader 5.
[0026] During operation, the heat generated by the coil windings of a specific phase of the motor stator 4 is conducted through the heat dissipation plate 5 to the cooling surface of the thermoelectric cooling plate 6, and then dissipated to the outside through the heat dissipation surface of the thermoelectric cooling plate 6. This avoids the peak temperature rise caused by the coil windings of a specific phase of the motor stator 4 generating heat due to overload, thus helping the motor stator 4 of the moving magnet linear motor to maintain better working performance and avoid local overheating affecting working accuracy.
[0027] The heat spreader 5 is a thermally conductive silicone sheet, or it can be made of a metal or non-metal material with low thermal resistance.
[0028] To improve the heat conduction performance of the heat spreader 5 to the motor stator 4 and ensure that the heat of each part of the motor stator 4 in the linear motion direction of the motor mover 3 can be quickly removed by the heat spreader 5, the projection of the motor stator 4 on the linear motion trajectory plane of the motor mover 3 is located within the corresponding projection range of the heat spreader 5, ensuring that at least one side of each part of the motor stator 4 in the linear motion direction of the motor mover 3 is in contact with the heat spreader 5.
[0029] To improve the thermal conductivity of the motor stator 4, cooling channels can be set inside the motor stator 4 as needed. By setting cooling channels, the heat generated by the coil winding can be quickly removed, and heat can be avoided from accumulating in the coil winding of a specific phase, which would cause the peak temperature to rise.
[0030] To further improve the heat dissipation effect of the thermoelectric cooling element 6 on the motor stator 4, a radiator 7 is also provided on the outer side of the mounting base 1. The radiator 7 is connected to the heat dissipation surface of the thermoelectric cooling element 6. The radiator 7 has a large heat dissipation area, which can quickly exchange the heat gathered on the heat dissipation surface of the thermoelectric cooling element 6 with the outside cold air to achieve heat dissipation.
[0031] Furthermore, a cooling fan can be installed on the radiator 7 to further improve the heat dissipation capacity of the radiator 7.
[0032] like Figure 2 The diagram shown is an exploded perspective view of one embodiment of the motor actuator 3. Magnetic rails 32 are respectively provided on two opposite sides of the magnetic rail mounting plate 31. The shape and structure of the magnetic rail mounting plate 31 can be varied, and various designs can be adopted. Figure 2 or Figure 2 The structure shown is not limited here; as... Figure 4 As shown, correspondingly, motor stators 4 are provided on two opposite sides of the motor mover 3. This structure allows the motor stators 4 on both sides to interact with the magnetic rails 32 to increase the driving thrust of the moving magnet linear motor.
[0033] As is well known, a controller (not shown in the figure) is installed inside the cavity of the mounting base 1, and the controller is electrically connected to the coil winding of the motor stator 4. Of course, the thermoelectric cooling chip 6 and the cooling fan are also electrically connected to the controller. In order to reduce the impact of the heat generated by the coil winding during energization on the controller when it accumulates inside the cavity, several heat dissipation slots 311 can be provided at the upper end of the magnetic track mounting plate 31 to increase the surface area of the upper end of the magnetic track mounting plate 31, so that the upper end of the magnetic track mounting plate 31 located in the through slot and the part exposed upward through the slot can exchange heat with the outside to improve the heat dissipation performance.
[0034] In order to improve the flexibility and accuracy of linear motion of the movable seat 2 relative to the mounting seat 1, a sliding fit structure is provided between the upper surfaces of the movable seat 2 and the mounting seat 1, and the movable seat 2 is slidably connected to the mounting seat 1 using the sliding fit structure.
[0035] In the field of linear motors, common sliding fit structures are slide rail structures or air-bearing structures. For example, see attached... Figure 4 The structure shown is a slide rail structure, including a slide rail 81 and a sliding seat 82 that slides with the slide rail 81. One of the slide rail 81 and the sliding seat 82 is fixed to the bottom side of the movable seat 2, while the other is fixed to the upper surface of the mounting seat 1.
[0036] Furthermore, to prevent foreign objects from falling into the cavity 11 from the through groove 12 on the upper surface of the mounting base 1 during use and affecting the movement of the motor mover 3, the linear motor also includes a protective structure that shields the through groove 12.
[0037] Specifically, the protective structure includes: U-shaped guide plates 13 respectively provided on two opposite sides of the through groove 12 on the upper surface of the mounting base 1, the length of the end of the U-shaped guide plate 13 extending beyond the end of the through groove 12, and the movable base 2 straddling the two U-shaped guide plates 13; end side plates 14 respectively provided between the ends of the two U-shaped guide plates 13, and a bellows cover 15 connected between the end side plate 14 and the movable base 2, the two sides of the bellows cover 15 being located inside the two U-shaped guide plates 13 respectively, so that the movable base 2 and the bellows cover 15 cooperate to completely cover the through groove 12 on the upper surface of the mounting base 1.
[0038] The two U-shaped guide plates 13 can limit the stretching or contraction of the bellows cover 15 during the linear motion of the moving seat 2, and also allow processing fluid, dust and other debris that may fall onto the surface of the bellows cover 15 to be discharged in time through the two U-shaped guide plates 13, so as to prevent them from entering the cavity 11 of the mounting seat 1 through the through groove 12, thus protecting the linear motor.
[0039] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A moving-magnet linear motor with good heat dissipation, characterized in that, include: The device includes an internal cavity mounting base with an elongated through-slot on its upper surface that communicates with the cavity; a movable base slidably connected to the upper surface of the mounting base; a motor mover and a motor stator housed within the cavity; the motor mover includes a magnetic rail mounting plate that passes through the through-slot and is fixedly connected to the movable base, and a magnetic rail fixed to the side of the magnetic rail mounting plate; the motor stator includes coil windings arranged opposite to the magnetic rail; and a heat spreader and a thermoelectric cooling plate. The thermoelectric cooling plate is fixed to the mounting base, with its heat dissipation surface located on the outer side of the mounting base and its cooling surface located within the cavity, and the cooling surface abutting against the motor stator through the heat spreader.
2. The moving magnet linear motor according to claim 1, characterized in that, The projections of the motor stator onto the linear motion trajectory plane of the motor mover are all within the corresponding projection range of the heat spreader.
3. The moving magnet linear motor according to claim 1, characterized in that, The heat spreader is a thermally conductive silicone sheet.
4. The moving magnet linear motor according to claim 1, characterized in that, The motor stator is also equipped with cooling channels.
5. The moving magnet linear motor according to claim 1, characterized in that, A radiator is also provided on the outer side of the mounting base, and the radiator is connected to the heat dissipation surface of the thermoelectric cooling element; a cooling fan is provided on the radiator.
6. The moving magnet linear motor according to claim 1, characterized in that, Magnetic rails are provided on two opposite sides of the magnetic rail mounting plate, and motor stators are provided on two opposite sides of the motor mover.
7. The moving magnet linear motor according to claim 1, characterized in that, Several heat dissipation grooves are provided at the upper end of the magnetic track mounting plate.
8. The moving magnet linear motor according to claim 1, characterized in that, A sliding fit structure is provided between the upper surfaces of the movable seat and the mounting seat. The sliding fit structure is either a slide rail structure or an air-bearing structure.
9. The moving magnet linear motor according to any one of claims 1-8, characterized in that, It also includes a protective structure that shields the through-slot.
10. The moving magnet linear motor according to claim 9, characterized in that, The protective structure includes: U-shaped guide plates respectively arranged on two opposite sides of the through groove, the end length of the U-shaped guide plates extending beyond the end of the through groove, and a movable seat straddling the two U-shaped guide plates; end side plates respectively arranged between the ends of the two U-shaped guide plates, and a bellows cover connected between the end side plates and the movable seat, with the two sides of the bellows cover located inside the two U-shaped guide plates respectively.