Modularized permanent magnet linear motor

Abstract

The invention discloses a modular permanent magnet linear motor, which belongs to the technical field of motors and comprises a primary module and a secondary module arranged in the primary module and slidably connected with the primary module. The primary module comprises a shell, and a permanent magnet and a primary iron core which are sequentially stacked on the inner wall of the shell; the secondary module comprises a secondary iron core corresponding to the primary iron core and a winding arranged on the secondary iron core; the secondary iron core is arranged in the shell and is in sliding connection with the shell; a permanent magnetic field generated by the permanent magnet forms a magnetic loop through the shell, the primary iron core and the secondary iron core; the winding is connected with a three-phase alternating current power supply and generates a traveling wave magnetic field around the primary module; the permanent magnetic field interacts with the traveling wave magnetic field to generate electromagnetic thrust to drive the secondary module to slide relative to the primary module. According to the modular permanent magnet linear motor, the problem of large permanent magnet error caused by increase of the number of permanent magnet pole pairs can be avoided while the position control precision is ensured.

Description

Technical Field

[0001] The invention relates to a modular permanent magnet linear motor, belonging to the technical field of motors. Background Art

[0002] A linear motor is a transmission device that converts electrical energy directly into linear motion mechanical energy without any intermediate conversion mechanism. A linear motor can be regarded as a rotating motor cut radially and unfolded into a plane. The side evolved from the stator is called the primary, and the side evolved from the rotor is called the secondary.

[0003] Compared with the solution of using a rotary motor plus a ball screw to form linear motion, the solution of using a linear motor to directly generate linear motion has a simpler structure, higher efficiency and better stability.

[0004] Linear motors are divided into two categories: induction linear motors and permanent magnet linear motors. Compared with induction linear motors, permanent magnet linear motors have higher control accuracy and better thrust density, power factor and efficiency performance.

[0005] At present, the secondary of permanent magnet linear motor generally adopts surface-mounted permanent magnet structure, which is easy to generate large positioning force, cause thrust fluctuation and reduce position control accuracy. Increasing the number of permanent magnet pole pairs of the secondary of permanent magnet linear motor is an effective way to reduce positioning force and improve position control accuracy, but increasing the number of permanent magnet pole pairs requires a small size of a single permanent magnet, and the difficulty of permanent magnet pasting is high, resulting in large permanent magnet pasting error, high requirements for processing technology, and difficult installation. Summary of the invention

[0006] The object of the present invention is to provide a modular permanent magnet linear motor which can avoid the problem of large permanent magnet error caused by increasing the number of permanent magnet pole pairs while ensuring position control accuracy.

[0007] In order to achieve the above object, the present invention provides the following technical solutions: A modular permanent magnet linear motor comprises a primary module, and a secondary module placed in the primary module and slidably connected to the primary module; the primary module comprises a shell, and a permanent magnet and a primary core stacked in sequence on the inner wall of the shell; the secondary module comprises a secondary core corresponding to the primary core, and a winding arranged on the secondary core; the secondary core is placed in the shell and slidably connected to the shell; the permanent magnetic field generated by the permanent magnet forms a magnetic circuit through the shell, the primary core and the secondary core; the winding is connected to a three-phase AC power supply to generate a traveling wave magnetic field around the primary module; the permanent magnetic field interacts with the traveling wave magnetic field to generate an electromagnetic thrust to drive the secondary module to slide relative to the primary module.

[0008] In combination with the first aspect, further, the shell is a U-shaped slot structure, the secondary core is placed in the U-shaped slot structure, and is slidably connected to the U-shaped slot structure via a sliding assembly.

[0009] In combination with the first aspect, further, the permanent magnet and the primary iron core are stacked in sequence on the inner walls on both sides of the U-shaped slot structure, and the primary iron core is axially provided with a plurality of primary teeth on the side facing the secondary iron core; the secondary iron core is axially provided with a plurality of first secondary teeth on both sides facing the primary iron core, the winding is wound on the first secondary teeth, and each of the first secondary teeth is axially provided with a plurality of second secondary teeth corresponding to the primary teeth on the side facing the primary iron core.

[0010] In combination with the first aspect, further, the permanent magnets arranged on the inner walls on both sides of the U-shaped groove structure are symmetrical about the center line of the U-shaped groove structure.

[0011] In combination with the first aspect, further, the tooth grooves of the primary teeth of the primary iron core arranged on the inner walls on both sides of the U-shaped groove structure are staggered.

[0012] In combination with the first aspect, further, the winding is wound around the neck of the first secondary tooth, and the windings wound around the first secondary teeth on both sides of the secondary core are symmetrical about the center line of the secondary core.

[0013] In combination with the first aspect, further, the second secondary teeth on both sides of the secondary core are respectively arranged opposite to the primary teeth of the primary core arranged on the inner walls on both sides of the U-shaped groove structure, and the tooth spacing and height of the relatively arranged primary teeth and second secondary teeth are adapted to each other.

[0014] In combination with the first aspect, further, the sliding assembly includes guide rails arranged on both sides of the U-shaped groove structure and a connector arranged on the secondary core, and the connector is slidably connected to the guide rails through a slider.

[0015] In combination with the first aspect, further, a plurality of sliding blocks are provided, and the sliding blocks are distributed at equal intervals along the guide rail.

[0016] In combination with the first aspect, further, the connector is a T-shaped structure, the lower limb of the T-shaped structure is connected to the secondary core, and the two wings of the T-shaped structure are slidably connected to the guide rail through the slider.

[0017] In combination with the first aspect, further, the guide rail is axially provided with a groove matching the sliding block, and the sliding block is slidably connected to the guide rail via the groove.

[0018] In combination with the first aspect, further, the connector, the guide rail and the slider are all made of non-magnetic metal materials.

[0019] In combination with the first aspect, further, the connector, the guide rail and the slider are all made of aluminum alloy material.

[0020] In combination with the first aspect, further, the shell is made of magnetic conductive material; the primary core and the secondary core are both formed by stacking a number of silicon steel sheets.

[0021] In combination with the first aspect, further, the primary core and the secondary core are both formed by vertically stacking a plurality of silicon steel sheets.

[0022] In combination with the first aspect, further, the axial lengths of the shell, the primary core and the permanent magnet are consistent.

[0023] In combination with the first aspect, further, the magnetization direction of the permanent magnet is magnetization in the thickness direction, and the magnetization directions of the permanent magnets are consistent.

[0024] In combination with the first aspect, further, a plurality of primary modules are axially arranged, and the primary modules are connected end to end.

[0025] In combination with the first aspect, further, the guide rails corresponding to each primary module are also spliced ​​together end to end, and the secondary module cooperates with the guide rails connected end to end through the connector and the slider, and slides in the primary modules connected end to end.

[0026] In combination with the first aspect, further, a plurality of the secondary modules are radially arranged, and the secondary modules are connected in parallel via a connector.

[0027] In combination with the first aspect, further, each of the secondary modules is connected together in radial parallel via the connector, and each of the secondary modules cooperates with the guide rail via the connector and the slider, while sliding in the primary module.

[0028] In combination with the first aspect, further, the connector includes a plurality of T-shaped structures connected in parallel, the lower limbs of each T-shaped structure are respectively connected to the secondary core of each secondary module, the adjacent wing ends of each T-shaped structure are respectively connected in pairs, and the wing ends of the T-shaped structures on both sides are respectively slidably connected to the guide rail through the slider.

[0029] Compared with the prior art, the present invention has the following beneficial effects: The modular permanent magnet linear motor provided by the present invention adopts a modular setting, has a compact structure, high material utilization rate and low production cost. The secondary module is placed in the primary module and slidably connected with the primary module. The traveling wave magnetic field generated by the winding in the secondary module around the primary module interacts with the permanent magnetic field generated by the permanent magnet in the primary module to generate an electromagnetic thrust, driving the secondary module to slide relative to the primary module, which can ensure the position control accuracy while avoiding the problem of large permanent magnet error caused by increasing the number of permanent magnet pole pairs.

[0030] The modular permanent magnet linear motor provided by the present invention has primary iron core and secondary iron core relatively provided with primary teeth and second secondary teeth, and the magnetic field waveform can be modulated by adjusting the number of tooth slots of the primary teeth and the second secondary teeth to obtain better motor performance.

[0031] The modular permanent magnet linear motor provided by the present invention has a primary core and a secondary core both made of high magnetic permeability silicon steel sheets processed in a modular manner, which can reduce core loss and improve material utilization.

[0032] The modular permanent magnet linear motor provided by the present invention can set the number of primary modules or secondary modules as needed. The linear motion path of the secondary module can be increased by increasing the number of primary modules, and a greater linear thrust can be obtained by increasing the number of secondary modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of a modular permanent magnet linear motor provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a sliding assembly of a modular permanent magnet linear motor provided in an embodiment of the present invention; Figure 3 is a structural schematic diagram of a secondary module of a modular permanent magnet linear motor provided in an embodiment of the present invention; Figure 4 is a structural schematic diagram of a primary module of a modular permanent magnet linear motor provided in an embodiment of the present invention; Figure 5 is a top view of a primary module of a modular permanent magnet linear motor provided by an embodiment of the present invention; Figure 6 is a side unfolded view of a primary module of a modular permanent magnet linear motor provided by an embodiment of the present invention; Figure 7 Schematic diagram of the arrangement of multiple primary modules of a modular permanent magnet linear motor provided by an embodiment of the present invention; Figure 8 Schematic diagram of the combination of multiple stage modules of a modular permanent magnet linear motor provided by an embodiment of the present invention; In the figure: 1, connector; 2, guide rail; 3, slider; 4, secondary core; 5, winding; 6, permanent magnet; 71, housing; 72, primary core. DETAILED DESCRIPTION

[0034] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0035] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0036] Embodiment 1: This embodiment provides a modular permanent magnet linear motor, such as Figure 1 As shown, it includes a primary module, and a secondary module placed in the primary module and slidably connected to the primary module; the primary module includes a shell 71, and a permanent magnet 6 and a primary core 72 stacked in sequence on the inner wall of the shell 71; the secondary module includes a secondary core 4 corresponding to the primary core 72, and a winding 5 arranged on the secondary core 4; the secondary core 4 is placed in the shell 71 and slidably connected to the shell 71.

[0037] In this embodiment, the permanent magnetic field generated by the permanent magnet 6 forms a magnetic circuit through the shell 71, the primary iron core 72 and the secondary iron core 4; the winding 5 is connected to a three-phase AC power supply to generate a traveling wave magnetic field around the primary module; the permanent magnetic field interacts with the traveling wave magnetic field to generate an electromagnetic thrust, driving the secondary module to slide relative to the primary module.

[0038] The modular permanent magnet linear motor provided in this embodiment adopts a modular setting, has a compact structure, high material utilization rate and low production cost.

[0039] The secondary module is placed in the primary module and is slidably connected to the primary module. The traveling wave magnetic field generated by the winding 5 in the secondary module around the primary module interacts with the permanent magnetic field generated by the permanent magnet 6 in the primary module to generate electromagnetic thrust, driving the secondary module to slide relative to the primary module. This can ensure the position control accuracy while avoiding the problem of large permanent magnet error caused by increasing the number of permanent magnet poles.

[0040] Embodiment 2: This embodiment provides a modular permanent magnet linear motor. Based on the embodiment 1, Figure 1 As shown, the housing 71 is a U-shaped slot structure, the secondary core 4 is placed in the U-shaped slot structure, and is slidably connected to the U-shaped slot structure through a sliding assembly.

[0041] In this embodiment, Figure 4 As shown, the permanent magnet 6 and the primary iron core 72 are stacked in sequence on the inner walls of both sides of the U-shaped slot structure, and a plurality of primary teeth are axially arranged on one side of the primary iron core 72 facing the secondary iron core 4 .

[0042] Specifically, Figure 5 As shown, the permanent magnets 6 arranged on the inner walls on both sides of the U-shaped groove structure are symmetrical about the center line of the U-shaped groove structure; the tooth grooves of the primary teeth of the primary core 72 arranged on the inner walls on both sides of the U-shaped groove structure are staggered, that is, the primary teeth of the primary core 72 arranged on the inner wall on one side of the U-shaped groove structure are staggered with the tooth grooves of the primary teeth of the primary core 72 arranged on the inner wall on the other side of the U-shaped groove structure, that is, the teeth of the primary teeth of the primary core 72 arranged on the inner wall on one side of the U-shaped groove structure just correspond to the tooth grooves of the primary teeth of the primary core 72 arranged on the inner wall on the other side of the U-shaped groove structure. Figure 5 In the figure, the dotted line shows the center line of the U-shaped groove structure.

[0043] In this embodiment, Figure 3 As shown, the secondary core 4 is axially provided with a plurality of first secondary teeth on both sides facing the primary core 72 , the winding 5 is wound around the first secondary teeth, and each first secondary tooth is axially provided with a plurality of second secondary teeth corresponding to the primary teeth on one side facing the primary core 72 .

[0044] Specifically, Figure 3 As shown, the winding 5 is wound around the neck of the first secondary tooth, and the windings 5 ​​wound around the first secondary teeth on both sides of the secondary core 4 are symmetrical about the center line of the secondary core 4. Figure 6 As shown, the second secondary teeth on both sides of the secondary core 4 are respectively arranged opposite to the primary teeth of the primary core 72 arranged on the inner walls of both sides of the U-shaped slot structure, and the tooth spacing and height of the relatively arranged primary teeth and the second secondary teeth are adapted to each other. Obviously, the tooth width of the second secondary teeth is the same as the tooth slot width.

[0045] In the modular permanent magnet linear motor provided in this embodiment, the primary core 72 and the secondary core 4 are provided with primary teeth and secondary teeth in a relative manner, and the magnetic field waveform can be modulated by adjusting the number of tooth slots of the primary teeth and the second secondary teeth to obtain better motor performance. The tooth spacing and height of the primary teeth and the second secondary teeth provided in a relative manner are adapted to each other, which can improve the position control accuracy of the motor.

[0046] Embodiment 3: This embodiment provides a modular permanent magnet linear motor. Based on the embodiment 1, Figure 1 As shown, the housing 71 is a U-shaped slot structure, the secondary core 4 is placed in the U-shaped slot structure, and is slidably connected to the U-shaped slot structure through a sliding assembly.

[0047] In this embodiment, Figure 1As shown, the sliding assembly includes guide rails 2 arranged on both sides of the U-shaped groove structure and a connector 1 arranged on the secondary core 4. The connector 1 is slidably connected to the guide rails 2 through a slider 3.

[0048] In this embodiment, a plurality of sliders 3 are provided, and the sliders 3 are distributed at equal intervals along the guide rail 2 .

[0049] Specifically, Figure 2 As shown, the connector 1 is a T-shaped structure, the lower limb of the T-shaped structure is connected to the secondary core 4, and the two wings of the T-shaped structure are respectively slidably connected to the guide rail 2 through the slider 3. The guide rail 2 is axially provided with a groove matching the slider 3, and the slider 3 is slidably connected to the guide rail 2 through the groove.

[0050] In this embodiment, the connector 1, the guide rail 2 and the slider 3 are all made of non-magnetic metal materials.

[0051] Specifically, the connector 1 , the guide rail 2 and the slider 2 are all made of aluminum alloy.

[0052] In the modular permanent magnet linear motor provided in this embodiment, the guide rail 2 is axially provided with a groove matching the slider 3 , and the groove facilitates the connection between the slider 3 and the guide rail 2 , supports the slider 3 and guides the slider 3 to slide along the guide rail 2 .

[0053] Embodiment 4: This embodiment provides a modular permanent magnet linear motor. Based on the first embodiment, the housing 71 is made of magnetic conductive material; the primary core 72 and the secondary core 4 are both made of a plurality of stacked silicon steel sheets.

[0054] Specifically, the primary core 72 and the secondary core 4 are both formed by vertically stacking a number of silicon steel sheets.

[0055] In this embodiment, the axial lengths of the housing 71 , the primary core 72 and the permanent magnet 6 are consistent.

[0056] In the modular permanent magnet linear motor provided in this embodiment, both the primary core 72 and the secondary core 4 are made of high magnetic permeability silicon steel sheets processed in a modular manner, which can reduce core loss and improve material utilization.

[0057] Embodiment 5: This embodiment provides a modular permanent magnet linear motor. Based on the first embodiment, the magnetizing direction of the permanent magnet 6 is magnetizing in the thickness direction, and the magnetizing directions of the permanent magnets 6 are consistent.

[0058] In this embodiment, Figure 6 As shown, the permanent magnetic field generated by the permanent magnet 6 forms a magnetic circuit through the housing 71 , the primary iron core 72 and the secondary iron core 4 .

[0059] Specifically, Figure 6 As shown, the first side of the primary module ( Figure 6 The permanent magnetic field generated by the permanent magnet 6 on the right side of the primary module is transmitted from the first side of the housing 71 ( Figure 6 The right side of the housing 71 flows in along the U-shaped groove structure from the second side of the housing 71 ( Figure 6 The left side of the middle shell 71) flows out, and passes through the second side of the primary module ( Figure 6 The permanent magnet 6, the primary core 72 and the air gap of the primary module are formed from the first side of the secondary core 4 ( Figure 6 The left side of the secondary core 4 flows in, along the secondary core 4, from the second side of the secondary core 4 ( Figure 6 The right side of the secondary core 4) flows out and passes through the first side of the primary module ( Figure 6 The air gap and the primary core 72 of the right side of the primary module flow back to the first side of the primary module ( Figure 6 The permanent magnet 6 on the right side of the primary module forms a magnetic circuit. Figure 6 In the figure, the dotted line shows the magnetic circuit and the arrow shows the direction of the magnetic circuit.

[0060] Embodiment 6: This embodiment provides a modular permanent magnet linear motor. Based on any one of Embodiments 1 to 5, Figure 7 As shown, a plurality of primary modules are axially arranged, and the primary modules are connected end to end.

[0061] In this embodiment, one or more primary modules may be provided, and more than one primary modules are spliced ​​together end to end.

[0062] Specifically, based on Example 3, the guide rails 2 corresponding to the primary modules are also spliced ​​together end to end, and the secondary module can cooperate with the guide rails 2 connected end to end through the connector 1 and the slider 3 to slide in the primary modules connected end to end.

[0063] The modular permanent magnet linear motor provided in this embodiment improves the linear motion path of the secondary module by providing a plurality of primary modules.

[0064] Embodiment 7: This embodiment provides a modular permanent magnet linear motor. Based on any one of Embodiments 1 to 5, Figure 8 As shown, a plurality of secondary modules are radially arranged, and the secondary modules are connected in parallel via a connector 1 .

[0065] In this embodiment, one or more secondary modules may be provided, and the more than one secondary modules are radially connected in parallel.

[0066] Specifically, on the basis of Embodiment 3, more than one secondary module is connected together in radial parallel via the connector 1, and each secondary module can cooperate with the guide rail 2 via the connector 1 and the slider 3, and slide in the primary module at the same time.

[0067] In this embodiment, Figure 8 As shown, the connector 1 includes a plurality of T-shaped structures connected in parallel, the lower limbs of each T-shaped structure are respectively connected to the secondary core 4 of each secondary module, the adjacent wing ends of each T-shaped structure are respectively connected in pairs, and the wing ends of the T-shaped structures on both sides are respectively slidably connected to the guide rail 2 through the slider 3.

[0068] The modular permanent magnet linear motor provided in this embodiment obtains greater linear thrust by providing multiple secondary modules.

[0069] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A modular permanent magnet linear motor, characterized in that: The invention comprises a primary module, and a secondary module disposed in the primary module and slidably connected to the primary module; the primary module comprises a shell (71), and a permanent magnet (6) and a primary iron core (72) stacked in sequence on the inner wall of the shell (71); the secondary module comprises a secondary iron core (4) corresponding to the primary iron core (72), and a winding (5) disposed on the secondary iron core (4); the secondary iron core (4) is disposed in the shell (71) and slidably connected to the shell (71); the permanent magnetic field generated by the permanent magnet (6) forms a magnetic circuit through the shell (71), the primary iron core (72) and the secondary iron core (4); the winding (5) is connected to a three-phase AC power supply to generate a traveling wave magnetic field around the primary module; the permanent magnetic field interacts with the traveling wave magnetic field to generate an electromagnetic thrust, driving the secondary module to slide relative to the primary module.

2. The modular permanent magnet linear motor according to claim 1, characterized in that: The housing (71) is a U-shaped groove structure, and the secondary iron core (4) is placed in the U-shaped groove structure and is slidably connected to the U-shaped groove structure via a sliding assembly.

3. The modular permanent magnet linear motor according to claim 2, characterized in that: The permanent magnet (6) and the primary iron core (72) are stacked in sequence on the inner walls of both sides of the U-shaped slot structure; a plurality of primary teeth are axially arranged on the side of the primary iron core (72) facing the secondary iron core (4); a plurality of first secondary teeth are axially arranged on both sides of the secondary iron core (4) facing the primary iron core (72); the winding (5) is wound around the first secondary teeth, and each of the first secondary teeth is axially arranged on the side of the primary iron core (72) facing the primary iron core (72) with a plurality of second secondary teeth corresponding to the primary teeth.

4. The modular permanent magnet linear motor according to claim 3, characterized in that: The tooth grooves of the primary teeth of the primary iron core (72) arranged on the inner walls of both sides of the U-shaped groove structure are staggered.

5. The modular permanent magnet linear motor according to claim 2, characterized in that: The sliding assembly comprises guide rails (2) arranged on both sides of the U-shaped groove structure and a connector (1) arranged on the secondary core (4); the connector (1) is slidably connected to the guide rails (2) via a slider (3).

6. The modular permanent magnet linear motor according to claim 5, characterized in that: The connector (1) is a T-shaped structure, the lower limb of the T-shaped structure is connected to the secondary iron core (4), and the two wings of the T-shaped structure are slidably connected to the guide rail (2) via the sliders (3).

7. The modular permanent magnet linear motor according to claim 1, characterized in that: The shell (71) is made of magnetic conductive material; the primary iron core (72) and the secondary iron core (4) are both made of a plurality of stacked silicon steel sheets.

8. The modular permanent magnet linear motor according to claim 1, characterized in that: The magnetization direction of the permanent magnets (6) is magnetization in the thickness direction, and the magnetization directions of the permanent magnets (6) are consistent.

9. The modular permanent magnet linear motor according to claim 1, characterized in that: A plurality of primary modules are axially arranged, and the primary modules are connected end to end.

10. The modular permanent magnet linear motor according to claim 1, characterized in that: A plurality of secondary modules are radially arranged, and the secondary modules are connected in parallel via a connector (1).

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