Compound salient pole mover permanent magnet linear motor

Abstract

The present invention provides a composite salient pole mover permanent magnet linear motor, which belongs to the technical field of motors, and includes a double-sided plug-in stator and a composite salient pole permanent magnet mover, wherein the composite salient pole permanent magnet mover moves in a longitudinal direction relative to the double-sided plug-in stator; the composite salient pole permanent magnet mover is composed of a permanent magnet, a non-ferromagnetic conductive strip, a salient pole region, an insulating layer, a lower end of a plate, and an upper end of a plate, wherein the permanent magnet, the non-ferromagnetic conductive strip, the salient pole region, and the insulating layer are alternately arranged in the longitudinal direction, and the lower end of the plate and the upper end of the plate are respectively arranged on both sides of the permanent magnet, the non-ferromagnetic conductive strip, the salient pole region, and the insulating layer in the longitudinal direction; the double-sided plug-in stator includes a plug-in stator yoke and a plug-in coil unit, and the double-sided plug-in stator is symmetrically arranged on both sides of the composite salient pole permanent magnet mover. The present invention improves the durable operation capability of the permanent magnet linear synchronous motor, meets the durable operation requirements of the electromagnetic propulsion system, is easy to dissipate heat, is easy to replace, reduces the volume of the motor system, saves costs, and is convenient for engineering applications.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a composite salient-pole mover permanent magnet linear motor with high speed and high durability. Background Art

[0002] With the development of electromagnetic propulsion of linear motors, the load requirements, target speeds and running time of electromagnetic propulsion of linear motors have increased, and permanent magnet linear synchronous motors have gradually become the mainstream research and development trend of electromagnetic propulsion of linear motors. Existing permanent magnet linear synchronous motors require complex drive control algorithms and fast and accurate sensor signal feedback to achieve their starting, speed regulation and maintain normal operation. Therefore, existing permanent magnet linear synchronous motors are highly dependent on external equipment such as auxiliary starters, drivers, and sensors. However, the accuracy and sensitivity of external equipment are limited, and it is difficult to fully meet the requirements during high-speed or ultra-high-speed operation, which increases the uncertainty and failure rate of the starting and running process of permanent magnet linear synchronous motors, and easily leads to abnormal conditions such as motor loss of step and jamming, further causing instantaneous temperature rise, permanent magnet demagnetization, and even motor burnout. Serious faults, thereby causing electrical restrictions on the improvement of the indicators of electromagnetic propulsion of permanent magnet linear synchronous motors. In addition, the use of external equipment increases the system volume and cost, causing operational and maintenance difficulties for the realization of the high-speed and durable goals of electromagnetic propulsion of permanent magnet linear synchronous motors. Summary of the invention

[0003] The object of the present invention is to provide a composite salient-pole mover permanent magnet linear motor to solve at least one technical problem existing in the above-mentioned background technology.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The invention provides a highly durable composite salient pole mover permanent magnet linear motor, comprising a double-sided plug-in stator and a composite salient pole permanent magnet mover, wherein the composite salient pole permanent magnet mover moves longitudinally relative to the double-sided plug-in stator.

[0006] Furthermore, the composite salient pole permanent magnet mover is composed of permanent magnets, non-ferromagnetic conductive strips, salient pole regions, insulating layers, a lower end of a plate, and an upper end of a plate. The permanent magnets, non-ferromagnetic conductive strips, salient pole regions, and insulating layers are arranged alternately in the longitudinal direction, and the lower end of the plate and the upper end of the plate are respectively installed below and above the permanent magnets, non-ferromagnetic conductive strips, salient pole regions, and insulating layers in the longitudinal direction.

[0007] Furthermore, the bilateral plug-in stators are symmetrically arranged on both sides of the composite salient pole permanent magnet mover, and both sides include a plug-in stator yoke and a plug-in coil unit.

[0008] Furthermore, the non-ferromagnetic conductive strip, the lower end of the plate and the upper end of the plate together constitute the induction current path of the mover; the non-ferromagnetic conductive strip, the lower end of the plate and the upper end of the plate are all selected to have a relative magnetic permeability close to 1 and an electrical conductivity higher than 6.25×10 6 S / m is a non-ferromagnetic conductive metal or alloy; however, the materials of the non-ferromagnetic conductive strip, the lower end of the plate, and the upper end of the plate may be the same or different, and the structure may be derived from the same plate, or may be formed by connecting and fixing different plates.

[0009] Furthermore, the salient pole region is fixed to the side of the non-ferromagnetic conductive strip by gluing, and is distributed on both sides of the permanent magnet but with an insulating layer between the permanent magnet; the salient pole region is made of a soft magnetic material with good magnetic conductivity and low electrical conductivity.

[0010] Furthermore, the insulating layer includes gaps between the permanent magnet and the salient pole region, and lateral rectangular grooves between the non-ferromagnetic conductive strips; the insulating layer can be made of solid insulation or air with a relative magnetic permeability close to 1.

[0011] Furthermore, the upper end of the plate is provided with a permanent magnet mounting hole, a transverse heat dissipation channel, a middle ventilation groove, a front ventilation groove, and a rear ventilation groove to prevent the permanent magnet from losing magnetism due to heat accumulation.

[0012] Furthermore, the transverse heat dissipation channel is a transverse air groove connected to the central ventilation groove, so as to facilitate the heat of the composite salient pole permanent magnet mover to be dissipated from above.

[0013] Furthermore, the middle ventilation groove, front ventilation groove and rear ventilation groove are all air grooves that penetrate longitudinally. During the movement of the composite salient pole permanent magnet mover, natural air cooling is formed in the middle ventilation groove, front ventilation groove and rear ventilation groove. In order to ensure mechanical strength, the middle ventilation groove is not connected with the front ventilation groove and the rear ventilation groove, but there is no restriction on the shape and size of the grooves.

[0014] Furthermore, the plug-in coil unit is a concentrated winding, which is composed of a molded coil sleeved on a T-shaped frame. A plurality of plug-in coil units are longitudinally arranged and installed on the inner side of the stator yoke, and the molded coils are connected via horizontal cables.

[0015] Furthermore, the baffle of the T-shaped frame is installed toward one side of the composite salient pole permanent magnet mover to protect the coil from cutting with the composite salient pole permanent magnet mover during the operation of the motor; and the stator heat dissipation groove and the installation hole are penetrated laterally.

[0016] Furthermore, the heat dissipation slots are arranged alternately in two rows in the transverse direction, and the closer to the upper and lower ends, the denser the arrangement of the heat dissipation slots.

[0017] The driving mode of the high-durability composite salient pole permanent magnet linear motor: As the composite salient pole permanent magnet mover moves horizontally, the energized range of the double-sided plug-in stator always covers the location of the composite salient pole permanent magnet mover; in the asynchronous state, the non-ferromagnetic conductive bars generate asynchronous electromagnetic thrust, and the salient pole area generates synchronous magnetic resistance thrust. The driving modes include self-starting mode, durable speed regulation mode, and open-loop commutation mode.

[0018] Self-starting mode: The converter or power grid feeds a three-phase symmetrical sinusoidal AC with a constant frequency into the double-sided plug-in stator, and the stationary composite salient-pole permanent magnet rotor starts to move. After several cycles of acceleration and speed oscillation, it reaches the synchronous speed, thus achieving self-starting.

[0019] Durable speed regulation mode: The inverter feeds variable frequency three-phase symmetrical sinusoidal AC into the double-sided plug-in stator. The power supply frequency is determined by the current motion state of the composite salient pole permanent magnet mover. The upper limit of the relative position error allowed is not less than 10%;

[0020] Open-loop commutation mode - the converter changes the phase sequence of two phases of the three-phase symmetrical sinusoidal alternating current and passes them into the bilateral plug-in stator. The power supply frequency is determined by the target speed after the commutation of the compound salient pole permanent magnet rotor. The compound salient pole permanent magnet rotor reaches the target speed in the reverse direction after several cycles of speed oscillation.

[0021] The resistance calculation method of the composite salient pole permanent magnet mover is: it is composed of a composite salient pole permanent magnet mover resistance network under a pole pitch through multiple cascades, and a composite salient pole permanent magnet mover resistance network under a pole pitch includes the resistance of non-ferromagnetic conductive bars, the resistance of the upper end of the plate, and the resistance of the lower end of the plate, wherein the influence of the permanent magnet mounting hole, the lateral heat dissipation channel, the middle ventilation groove, the front ventilation groove, and the rear ventilation groove are taken into account in the resistance of the upper end of the plate by a resistance conversion coefficient greater than 1.

[0022] The beneficial effects of the present invention are as follows: the durable operation capability of the permanent magnet linear synchronous motor is improved, the durable operation requirements of the electromagnetic propulsion system are met, and the present invention has the advantages of easy heat dissipation, easy replacement, reduced motor system size, and cost savings, which is convenient for engineering applications.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the high-durability composite salient-pole mover permanent magnet linear motor described in an embodiment of the present invention.

[0026] Figure 2 It is a schematic top view of the high-durability composite salient-pole mover permanent magnet linear motor described in an embodiment of the present invention.

[0027] Figure 3 It is a three-dimensional schematic diagram of the composite salient-pole permanent magnet mover described in an embodiment of the present invention, as well as a schematic diagram of the structure of the lateral heat dissipation channel, the middle ventilation groove, the front ventilation groove, and the rear ventilation groove.

[0028] Figure 4 This is a front view of the composite salient-pole permanent magnet mover described in an embodiment of the present invention, wherein the non-ferromagnetic conductive bars, the upper end of the plate, and the lower end of the plate are derived from the same plate.

[0029] Figure 5 This is a front view of the composite salient-pole permanent magnet mover described in an embodiment of the present invention, wherein the non-ferromagnetic conductive bars, the upper end of the plate, and the lower end of the plate are derived from different plates.

[0030] Figure 6 It is a three-dimensional schematic diagram and a front view of the T-shaped skeleton described in an embodiment of the present invention.

[0031] Figure 7 It is a three-dimensional schematic diagram of the double-sided plug-in stator described in an embodiment of the present invention.

[0032] Figure 8 The figure is a schematic diagram of the arrangement and connection of the plug-in coil units according to an embodiment of the present invention.

[0033] Fig. 9 This is a phase sequence diagram of the stator winding when the motor according to an embodiment of the present invention moves in reverse.

[0034] Fig.10 Schematic diagram of the timing of the mover speed and power supply frequency in three driving modes of the motor according to an embodiment of the present invention.

[0035] Fig.11 This is a resistance network under one pole pitch of the composite salient pole permanent magnet mover described in an embodiment of the present invention.

[0036] Wherein: 100-plug-in stator yoke; 101-plug-in coil unit; 102-T-shaped frame; 103-unequally spaced heat dissipation grooves; 104-mounting hole; 105-molded coil; 106-horizontal cable; 100(1)-alignment boss; 100(2)-alignment groove; 102(1)-coil frame; 102(2)-wide baffle; 200-permanent magnet; 201-non-ferromagnetic guide bar; 202-salient pole area; 203-insulating layer; 204-lower end of plate; 205-upper end of plate; 206-permanent magnet mounting hole; 207-horizontal heat dissipation channel; 208-middle ventilation groove; 209-front ventilation groove; 210-rear ventilation groove. DETAILED DESCRIPTION

[0037] The embodiments of the present invention 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 by the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0038] It should be understood by those skilled in the art that unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this invention belongs.

[0039] It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have a meaning consistent with that in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless as defined herein.

[0040] It should be noted that the structures, dimensions and / or orientations indicated by the terms “first type rectangular groove”, “second type rectangular groove”, “distance”, “thickness”, “length”, “L side”, “R side”, etc. are based on the structures, dimensions and / or orientations shown in the accompanying drawings. They are only for the convenience of describing the present invention and distinguishing between multiple types of structures, dimensions and / or orientations, and do not indicate or imply that the structures, dimensions and / or orientations of the elements and / or components referred to must meet the meanings referred to by the general understanding of the terms. Therefore, they cannot be understood as limitations on the present invention.

[0041] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or groups thereof.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0043] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the description of this specification, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present technology and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present technology.

[0045] Unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in this technology can be understood according to specific circumstances.

[0046] To facilitate understanding of the present invention, the present invention is further explained below with reference to specific embodiments in conjunction with the accompanying drawings, and the specific embodiments do not constitute a limitation on the embodiments of the present invention.

[0047] Those skilled in the art should understand that the drawings are merely schematic diagrams of embodiments, and the components in the drawings are not necessarily necessary for implementing the present invention.

[0048] Example

[0049] See also Figure 1 , Figure 2A highly durable composite salient pole mover permanent magnet linear motor provided by this embodiment is now described. The motor comprises a composite salient pole permanent magnet mover and a double-sided plug-in stator, the double-sided plug-in stator is fixed on the ground or on a mounting frame, and the composite salient pole permanent magnet mover is placed on the geometric center line of the double-sided plug-in stator and moves longitudinally relative to the double-sided plug-in stator.

[0050] Please also read Figures 1 to 4 As a specific implementation of the composite salient pole permanent magnet mover provided in this embodiment, its non-ferromagnetic conductive strip, the upper end of the plate, and the lower end of the plate are derived from the same plate. According to the motor design theory, preferably, a plurality of first-type rectangular grooves and second-type rectangular grooves that penetrate laterally but leave margins both horizontally and vertically are firstly processed on the aluminum plate, and the aluminum strips separated by the rectangular grooves along the horizontal direction are the non-ferromagnetic conductive strips 201, and the upper end and the lower end constitute the upper end 205 and the lower end 204 of the plate of the composite salient pole permanent magnet mover. Then, the middle ventilation groove 208, the front ventilation groove 209, and the rear ventilation groove 210 that penetrate longitudinally are processed on the upper end 205 of the plate, as well as the permanent magnet mounting hole 206 that penetrates the upper end of the plate horizontally and the horizontal heat dissipation channel 207 that penetrates horizontally to the middle ventilation groove 208. Subsequently, the first type of rectangular grooves are processed: the first type of rectangular grooves separate a number of non-ferromagnetic conductive bars 201 to reduce the lateral component of the eddy current in the composite salient pole permanent magnet mover; preferably, solid insulating materials such as electrical wood can be selected to be embedded in the first type of rectangular grooves. In order to enhance the mechanical strength of the composite salient pole permanent magnet mover, the solid insulating material and the first type of rectangular grooves form an interference fit, that is, the thickness of the solid insulating material is slightly greater than the longitudinal length b of the first type of rectangular grooves. is Finally, the permanent magnet 200 and the salient pole region 202 are installed in the second type of rectangular slot: the permanent magnet 200 is installed in the middle of the second type of rectangular slot, the salient pole region 202 is fixed on the two walls of the second type of rectangular slot and symmetrically distributed on both sides of the permanent magnet, and an air gap is left between the salient pole region 202 and the permanent magnet 200. Therefore, the longitudinal length b of the second type of rectangular slot is s , the longitudinal length of the permanent magnet b PM The longitudinal length b of the salient pole area m Satisfaction relationship: b s >b PM +2b m The air gap between the salient pole region 202 in the second type of rectangular slot and the permanent magnet 200 and the solid insulating material in the first type of rectangular slot together form the insulating layer 203 of the composite salient pole permanent magnet mover.

[0051] Please also read Figure 1 , Figure 3 , Figure 5, this embodiment provides another specific implementation of the composite salient pole permanent magnet mover, where the non-ferromagnetic bars, the upper end of the plate, and the lower end of the plate are made of different non-ferromagnetic conductive materials. Preferably, first, a number of non-ferromagnetic bars 201 are machined from aluminum, and the upper end 205 and the lower end 204 of the plate are machined from copper. Then, longitudinally penetrating middle ventilation grooves 208, front ventilation grooves 209, and rear ventilation grooves 210 are machined on the upper end 205 of the plate, as well as permanent magnet mounting holes 206 that penetrate the upper end of the plate transversely and transverse heat dissipation channels 207 that penetrate transversely to the middle ventilation groove 208. Subsequently, according to the motor design theory, the permanent magnets 200, the salient pole regions 202, and the non-ferromagnetic bars 201 are arranged longitudinally and the three types of components are fixed to the upper end 205 and the lower end 204 of the plate. Among them, the permanent magnets 200 are fixed through the permanent magnet mounting holes 206, and the salient pole regions are fixed on the adjacent non-ferromagnetic bars 201. At the same time, two salient pole regions 202 are evenly distributed on both sides of the permanent magnet 200, and air gaps are left between the salient pole regions 202 and the permanent magnet 200, as well as between the non-ferromagnetic bars 201. Finally, in order to strengthen the structure of the composite salient pole permanent magnet mover, preferably, insulating glue is poured into the air gaps between the salient pole regions 202 and the permanent magnet 200, and between the non-ferromagnetic bars 201, and then heated, dried, and condensed to form an insulating layer 203.

[0052] Further, referring to Figure 1 , Figure 2 , Figure 4 and Figure 5 , the salient pole region 202 provides the reluctance thrust for pulling into synchronization, and a soft magnetic material with good magnetic conductivity and low conductivity is used; preferably, the longitudinal length b m of the salient pole region 202 and the longitudinal length b PM of the permanent magnet 200 satisfy 2b m >b PM . Figure 4 Silicon steel sheets can be laminated, Figure 5 and magnetic powder bonding can be used. Further, in order to ensure the longitudinal magnetic circuit of the motor, the longitudinal length of the insulating layer between the salient pole region 202 and the permanent magnet 200 satisfies b - b PM - 2b m <g; at the same time, the magnetization directions of two adjacent permanent magnets 200 are opposite, thus forming a pair of poles.

[0053] Further, for Figure 4 and Figure 5 the two implementation manners, the transverse lengths of the first type of rectangular groove and the second type of rectangular groove are both h, and are not less than the transverse length of the stator core; the transverse length h 205 of the upper end 205 of the plate satisfies: h 205 ≥πτ / 8, and the transverse length h 204 of the lower end 204 of the plate satisfies: h204 ≥πτ / 8.

[0054] Note: For Figure 4 and Figure 5 In the two implementation methods, the pole pitch τ of the composite salient pole permanent magnet mover, the number of non-ferromagnetic bars N under one pole pitch, and the longitudinal length of each element always satisfy the relationship: τ = b s +Nb 2 +(N-1)b is .

[0055] See also Figure 1 , Figure 2 , Figure 6 This embodiment provides a specific implementation of a T-shaped frame. The T-shaped frame 102 mainly includes unequally spaced heat dissipation slots 103, mounting holes 104, a coil frame 102 (1), and a wide baffle 102 (2). The longitudinal length b of the wide baffle 102 (2) is PP' Greater than the longitudinal length b of the coil frame 102 (1) QQ' Preferably, the difference between the longitudinal length of the wide baffle 102 (2) and the coil frame 102 (1) on one side (b PP' -b QQ' ) / 2 is slightly larger than the thickness of the formed coil 105. At the same time, the longitudinal length b of the wide baffle 102 (2) is PP' The unequally spaced heat dissipation slots 103 and the mounting holes 104 penetrate the coil frame 102 (1) and the wide baffle 102 (2) in the lateral direction. To obtain a better coil heat dissipation effect, the closer to the upper end or the lower end, the denser the distribution of the unequally spaced heat dissipation slots 103. From top to bottom, the distances between the unequally spaced heat dissipation slots 103 are respectively recorded as h 1 、h 2 、h 3 、h 4 、h 5 , satisfying: h 1 =h 5 >h 2 =h 4 >h 3 The T-shaped frame 102 is integrally cast and demoulded by insulating resin, which is convenient for mass production.

[0056] Please also read Figure 1 , Figure 2 , Figure 7, a specific implementation of the double-sided plug-in stator in this embodiment. First, the formed coil 105 is sleeved on the T-shaped frame 102 to form a plug-in coil unit 101. More preferably, three plug-in coil units 101 are arranged longitudinally and fixed on a plug-in stator yoke 100 through mounting holes 104 to form a stator pole pair, and the wide baffles 102 (2) of the three plug-in coil units 101 are all facing away from the plug-in stator yoke 100. Subsequently, a plurality of stator pole pairs are closely arranged longitudinally and fixed to the ground or a mounting frame to form a double-sided plug-in stator. The close arrangement is achieved in that the alignment bosses 100 (1) and the alignment grooves 100 (2) on each plug-in stator yoke 100 are accurately engaged. Finally, the outlet ends of the formed coils 105 are connected through horizontal cables 106 to form double-sided plug-in stator wiring.

[0057] Further, see Figure 7 , Figure 8 , this embodiment also provides a specific implementation of bilateral plug-in stator wiring. In order to facilitate the replacement of stator pole pairs, the outlet ends of the formed coils 105 are connected through horizontal cables 106, which include connecting wires at the tail end of the winding and A-phase, B-phase and C-phase busbars; in order to replace certain stator pole pairs without affecting the operation of the entire motor, a bilateral differential, single-side parallel centralized winding arrangement is adopted. Figure 8 As shown, the wiring of the double-sided plug-in stator is opposite on both sides (L side and R side), that is: at the corresponding position, the L side outlet terminal A+ corresponds to the R side A-, the L side outlet terminal A- corresponds to the R side outlet terminal A+, the L side outlet terminal B+ corresponds to the R side B-, the L side outlet terminal B- corresponds to the R side outlet terminal B+, the L side outlet terminal C+ corresponds to the R side C-, and the L side outlet terminal C- corresponds to the R side outlet terminal C+. At the same time, on a single side (L side or R side), the stator pole pairs arranged in the longitudinal direction are connected in parallel. Taking the L side as an example, Figure 8 As shown, the output terminals A-, B-, and C- of the two stator pole pairs are connected together by a horizontal cable 106, the output terminals A+ of the two stator pole pairs are connected to the A-phase bus, the output terminals B+ are connected to the B-phase bus, and the C+ are connected to the C-phase bus.

[0058] Please also refer to Figure 1 , Figure 2 , Figure 7 and Figure 8When replacing the stator pole pair, first disconnect the connection between the horizontal cable 106 and the outlet terminal of the formed coil 105; then pull out the original stator pole pair from the top, and then insert the new stator pole pair from the top, so that the alignment boss 100 (1) of the plug-in stator yoke of the new stator pole pair is completely embedded in the alignment groove of the adjacent plug-in stator yoke, and the alignment groove 100 (2) of the plug-in stator yoke just wraps the alignment boss of the adjacent plug-in stator yoke on the other side; finally, connect the outlet terminals A+, B+, and C+ of the new stator pole pair to the A-phase, B-phase, and C-phase busbars respectively to complete the replacement of the stator pole pair.

[0059] Please also read Figures 8 to 10 This embodiment also provides a driving mode embodiment of the motor. Preferably, a converter is used to apply three-phase symmetrical sinusoidal alternating current to the double-sided plug-in stator.

[0060] 0 to t 1 The time period is in self-start mode, the busbar power supply phase sequence is phase A, phase B, phase C, and the power supply frequency is constant at f s =V s / (2τ), the composite salient-pole permanent magnet rotor starts to move from rest, and after several cycles of acceleration and speed oscillation, at t 0 After a moment, the synchronous speed V is reached s , to achieve self-starting.

[0061] t 1 to 2 The time period is the endurance speed regulation mode, the busbar power supply phase sequence is phase A, phase B, phase C, and the power supply frequency f = v / (2τ) is determined by the instantaneous speed of the composite salient pole permanent magnet mover, and its value range is not less than V s / (2τ) and not greater than V 2 / (2τ); Preferably, the instantaneous speed of the composite salient pole permanent magnet rotor can be obtained by online differentiation of the displacement feedback signal. In the durable speed regulation mode, when the relative error between the position measurement value and the actual value reaches 10%, the high-durability composite salient pole rotor permanent magnet linear motor still does not have a serious out-of-step fault.

[0062] t 2 After the moment, it is in open-loop commutation mode, the busbar power supply phase sequence is phase A, phase C, phase B, and the power supply frequency is constant at f R =|V R | / (2τ), after several cycles of speed oscillation, the composite salient pole permanent magnet mover is 3 Always reach a stable reverse target speed and realize open-loop commutation.

[0063] Note: V s is the synchronous speed of the motor, that is, the target speed that the compound salient pole permanent magnet rotor is to achieve; v is the current speed of the compound salient pole permanent magnet rotor fed back by the sensor; V Ris the synchronous speed of the motor in reverse direction, i.e., the target speed to be achieved by the composite salient pole permanent magnet rotor in reverse direction. s The direction is positive, then V R The direction is negative, so when calculating the open-loop commutation mode power supply frequency, it is necessary to take V R The absolute value of the reverse synchronous speed of the motor.

[0064] Please also read Figure 3 , Fig.11 In this embodiment, a specific embodiment of the method for calculating the resistance of a composite salient pole permanent magnet mover is also provided. For a composite salient pole permanent magnet mover with multiple pole pitches, its total resistance is equal to the resistance value of multiple cascaded resistor networks under one pole pitch. The resistor network under one pole pitch of the composite salient pole permanent magnet mover is composed of non-ferromagnetic conductive strip resistors R 201 , the upper resistance of the board R 205-1 , the upper resistance of the board R 205-2 、Resistance R at the bottom of the board 204-1 And the resistance R at the bottom of the plate 204-2 Among them, the non-ferromagnetic conductor resistance R 201 The number of is equal to the number of non-ferromagnetic conductors under one pole pitch; the resistance R at the top of the plate 205-1 And the resistance R at the bottom of the plate 204-1 is the resistance of the upper and lower ends of the first type of rectangular slot, the number of which is equal to the number of non-ferromagnetic conductors under one pole pitch minus 1; the resistance of the upper end of the plate R 205-2 And the resistance R at the bottom of the plate 204-2 is the resistance at the upper and lower ends of the second type of rectangular slot, and the number is always equal to 1. It should be noted that because the longitudinal length b of the first type of rectangular slot is is The longitudinal length b of the second type rectangular groove s They may be unequal or equal, so the resistance R 205-1 And the upper resistance R 205-2 , and the resistance R at the bottom of the board 204-1 And the resistance R at the bottom of the plate 204-2 There is no definite equal relationship. Non-ferromagnetic conductor resistance R 201 , the upper resistance of the board R 205-1 , the upper resistance of the board R 205-2 、Resistance R at the bottom of the board 204-1 And the resistance R at the bottom of the plate 204-2 The following expressions can be used for theoretical calculations.

[0065] Non-ferromagnetic conductor resistance R 201 Theoretical calculation formula

[0066] Resistance R on the upper end of the board 205-1 Theoretical calculation formula

[0067] Resistance R on the upper end of the board 205-2 Theoretical calculation formula

[0068] Resistance R at the bottom of the board 204-1 Theoretical calculation formula

[0069] Resistance R at the bottom of the board 204-2 Theoretical calculation formula

[0070] Note: 201 is the resistivity of the non-ferromagnetic conductive strip 201, ρ 205 is the resistivity of the upper end 205 of the plate, ρ 204 is the resistivity of the lower end 204 of the plate. d is the effective thickness of the element, which is the smaller of half the lateral thickness of the element and the penetration depth: the penetration depth is given by Calculate, where ω is the angular velocity of the eddy current of the electric composite salient pole permanent magnet rotor; μ 0 =4π×10 -7 Henry / meter is the vacuum magnetic permeability; σ is the electrical conductivity of the element, and the electrical conductivity of the non-ferromagnetic conductive strip 201 is σ=1 / ρ 201 , the conductivity of the upper end 205 of the plate σ=1 / ρ 205 , the conductivity of the lower end 204 of the plate σ=1 / ρ 204 . k 205-1 The resistance R of the upper end of the plate caused by the ventilation grooves and the horizontal heat dissipation channels 205-1 Resistance conversion factor, k 205-2 The resistance R on the upper end of the plate caused by the ventilation grooves and the permanent magnet mounting holes 205-2 The ventilation grooves, transverse heat dissipation channels and permanent magnet mounting holes reduce the cross-sectional area of ​​the conductor, so the resistance conversion coefficient k 205-1 , k 205-1 Theoretically, it is no less than 1.

[0071] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative labor on the basis of the technical solution disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. A composite salient pole mover permanent magnet linear motor, characterized in that: include: A double-sided plug-in stator and a composite salient-pole permanent magnet mover, wherein the composite salient-pole permanent magnet mover moves in a longitudinal direction relative to the double-sided plug-in stator; The composite salient pole permanent magnet mover is composed of a permanent magnet, a non-ferromagnetic conductive strip, a salient pole region, an insulating layer, a lower end of a plate, and an upper end of a plate. The permanent magnet, the non-ferromagnetic conductive strip, the salient pole region, and the insulating layer are alternately arranged in the longitudinal direction, and the lower end of the plate and the upper end of the plate are respectively installed on both sides of the permanent magnet, the non-ferromagnetic conductive strip, the salient pole region, and the insulating layer in the longitudinal direction. The double-sided plug-in stator includes a plug-in stator yoke and a plug-in coil unit, and the double-sided plug-in stator is symmetrically arranged on both sides of the composite salient pole permanent magnet mover; The aluminum plate is provided with a plurality of first-type rectangular grooves and second-type rectangular grooves which penetrate laterally but have margins both horizontally and vertically. The aluminum strips separated by the first-type rectangular grooves and the second-type rectangular grooves along the longitudinal direction are non-ferromagnetic conductive strips; the upper and lower ends of the aluminum plate constitute the upper and lower ends of the plate of the composite salient pole permanent magnet mover; the upper end of the plate is provided with a middle ventilation groove, a front ventilation groove and a rear ventilation groove which penetrate longitudinally, as well as a permanent magnet mounting hole which penetrates horizontally through the upper end of the plate and a horizontal heat dissipation channel which penetrates horizontally to the middle ventilation groove; the first-type rectangular grooves separate a plurality of non-ferromagnetic conductive strips to reduce the lateral component of the eddy current in the composite salient pole permanent magnet mover; the permanent magnet is installed in the middle of the second-type rectangular groove, the salient pole area is fixed on the two walls of the second-type rectangular groove and is symmetrically distributed on both sides of the permanent magnet, and an air gap is left between the salient pole area and the permanent magnet; the longitudinal length b of the second-type rectangular groove is s , the longitudinal length of the permanent magnet b PM The longitudinal length b of the salient pole area m Satisfaction relationship: b s >b PM +2b m ; The air gap between the salient pole region and the permanent magnet in the second type of rectangular slot and the solid insulating material in the first type of rectangular slot together constitute the insulating layer of the composite salient pole permanent magnet mover.

2. The composite salient-pole mover permanent magnet linear motor according to claim 1, characterized in that: The non-ferromagnetic conductive bar, the lower end of the plate and the upper end of the plate together form an induced current path of the mover.

3. The composite salient-pole-motor permanent magnet linear motor according to claim 1, characterized in that: The transverse heat dissipation channel is a transverse air groove connected to the central ventilation groove, so as to facilitate the heat of the composite salient pole permanent magnet mover to be dissipated from above.

4. The composite salient-pole mover permanent magnet linear motor according to claim 3, characterized in that: The middle ventilation groove, the front ventilation groove and the rear ventilation groove are all air grooves that penetrate longitudinally. During the movement of the composite salient pole permanent magnet mover, natural air cooling is formed in the middle ventilation groove, the front ventilation groove and the rear ventilation groove.

5. The composite salient-pole mover permanent magnet linear motor according to claim 4, characterized in that: The plug-in coil unit is a concentrated winding, which is composed of a formed coil sleeved on a T-shaped frame. Multiple plug-in coil units are arranged longitudinally and installed on the inner side of the stator yoke, and the formed coils are connected via horizontal cables.

6. The composite salient-pole mover permanent magnet linear motor according to claim 5, characterized in that: The baffle of the T-shaped frame is installed toward one side of the composite salient pole permanent magnet mover to protect the coil from being cut by the composite salient pole permanent magnet mover during the operation of the motor, and stator heat dissipation grooves and installation holes are opened along the side.

7. The composite salient-pole mover permanent magnet linear motor according to claim 6, characterized in that: The stator heat dissipation slots are arranged alternately in two rows in the transverse direction, and the closer to the upper and lower ends, the denser the arrangement of the stator heat dissipation slots.

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