Alternating power supply circuit of and alternating power supply method for long stator linear motor

Abstract

An alternating power supply circuit of and an alternating power supply method for a long stator linear motor, and a long stator linear motor, relating to the technical field of motors. The alternating power supply circuit of the long stator linear motor comprises three-phase stator winding branch circuits, the stator winding branch circuits of respective phases being connected to a converter, the stator winding branch circuit of each phase comprising N sections of stator windings connected in series, each section of the stator windings being connected to a switching circuit in parallel, and when the switching circuit is closed, the parallelly-connected stator winding being short-circuited. Using the alternating power supply circuit of the long stator linear motor can increase the speed of switching power supply for stators, thus reducing the usage of power supply devices and system complexity.

Description

A rotating power supply circuit and rotating power supply method for a long stator linear motor Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a rotation power supply circuit for a long-stator linear motor; and also to a rotation power supply method for a long-stator linear motor and a long-stator linear motor. Background Art

[0002] Linear motors are a new type of motor that can directly convert electrical energy into mechanical energy for linear motion. They have broad application prospects in areas such as rail transit. Long-stator linear motors can serve as the core drive component of rail transit and are of great significance to its development. The key to the long-stator linear motor drive system is power supply. This power supply uses an inverter to provide alternating current (AC) with variable amplitude and frequency to the stator, which then uses electromagnetic coupling to provide the necessary power for operation. For long-stator linear motors, stators are deployed along the entire line as needed. Therefore, simultaneously powering all stators is difficult and results in significant energy loss, significantly reducing the efficiency of the motor drive system. However, for long-stator linear motors, only the coupling between the stator and the mover actually participates in the electromechanical energy conversion. Therefore, normal operation of the mover can be achieved by simply ensuring power is supplied to the stator where the mover resides, effectively implementing segmented power supply for the stator.

[0003] Currently, stator segment rotation power supply methods for long-stator linear motors mainly include two-step and three-step methods. The two-step method requires two sets of power supply equipment, each of which supplies power to the stator on one side of the track. During the stator switching process, the power switch of the stator segment the mover is about to leave is first turned off, causing the converter output current to drop to zero. Then, the power switch of the stator segment the mover is about to enter is closed, causing the converter output current to increase. During the step switching process, there will be some jitter and loss in the driving force. The three-step method requires three sets of power supply equipment to alternately supply power to the stator segments on both sides, avoiding the jitter and loss of driving force during the stator segment switching process in the two-step method. However, the number of power supply equipment required complicates the system. Ultra-high-speed linear drives also require stator segment power supply. However, due to the extremely high speed of the mover, the switching of the power switches and converters in the two aforementioned rotation power supply methods is time-consuming. This can seriously affect the continuity and stability of the mover's driving force during ultra-high-speed linear drive operation, thereby affecting the ultimate target speed and the stability of the driven object.

[0004] In view of this, how to increase the speed of stator switching power supply and reduce the usage of power supply equipment and system complexity has become a technical problem that needs to be solved urgently by those skilled in the art.

[0005] Summary of the Invention

[0006] The purpose of this application is to provide a rotating power supply circuit for a long-stator linear motor. The application of this rotating power supply circuit can increase the speed of stator power switching and reduce the usage of power supply equipment and system complexity. Another purpose of this application is to provide a rotating power supply method for a long-stator linear motor and a long-stator linear motor, both of which have the above-mentioned technical effects.

[0007] To solve the above technical problems, the present application provides a rotation power supply circuit for a long stator linear motor, comprising:

[0008] Three-phase stator winding branch; the stator winding branch of each phase is connected to the converter, and the stator winding branch of each phase includes N sections of stator windings connected in series, and each section of the stator winding is connected in parallel with a switching circuit. When the switching circuit is closed, the parallel stator windings are short-circuited.

[0009] Optionally, the switching circuits of the stator windings of the same segment number in each phase of the stator winding branch connected in parallel are controlled by the same control signal.

[0010] Optionally, the head end of the stator winding branch of each phase is connected to the converter, and the end of the stator winding branch of each phase is connected in a star connection manner.

[0011] Optionally, the lengths of the stator windings in each section of the stator winding branch are equal.

[0012] Optionally, the switching circuit includes an electronic switch.

[0013] To solve the above technical problems, the present application further provides a rotation power supply method for a long-stator linear motor, which is applied to the rotation power supply circuit of the long-stator linear motor as described above, comprising:

[0014] Disconnecting the switch circuits connected in parallel to the m stator winding sections in the stator winding branch circuit to supply power to the m stator winding sections;

[0015] Monitor the moving position of the mover;

[0016] determining a target stator winding according to the moving position of the mover;

[0017] A switch circuit connected in parallel with the target stator winding is disconnected according to the moving position of the mover.

[0018] Optionally, the switching circuit for disconnecting the m stator winding segments in parallel in the stator winding branch includes:

[0019] Disconnect the switch circuit of m adjacent stator winding sections in parallel in the stator winding branch; m is greater than or equal to 2.

[0020] Optionally, determining the target stator winding according to the moving position of the mover includes:

[0021] When the mover is currently located at the nth section of the stator winding, the n+mth section of the stator winding in the moving direction of the mover is determined as the target stator winding.

[0022] Optionally, disconnecting the switch circuit connected in parallel with the target stator winding according to the moving position of the mover includes:

[0023] When the end of the mover leaves the nth section of the stator winding, the switch circuit connected in parallel to the n+mth section of the stator winding is disconnected, and the switch circuit connected in parallel to the nth section of the stator winding is closed.

[0024] In order to solve the above technical problems, the present application also provides a long-stator linear motor, including the rotation power supply circuit of the long-stator linear motor as described above.

[0025] The rotating power supply circuit of the long stator linear motor provided in the present application includes: a three-phase stator winding branch; the stator winding branch of each phase is connected to the converter, and the stator winding branch of each phase includes N sections of stator windings connected in series, and each section of the stator winding is connected in parallel with a switching circuit. When the switching circuit is closed, the parallel stator windings are short-circuited.

[0026] It can be seen that the rotating power supply circuit of the long stator linear motor provided by the present application can control the stator winding to be energized or deenergized by controlling the switch circuit to be closed or opened, which can increase the speed of switching the stator winding power supply. It can also realize live switching, which can effectively reduce the amount of converters and the system load, and reduce line costs. In addition, the degree of liberalization of the control of the rotating power supply circuit is relatively high, and multiple sections of stator windings can be powered simultaneously by disconnecting the switch circuits connected in parallel to multiple adjacent stator windings. In addition, by reducing the length of the stator winding, increasing the number of segments of the stator winding, and adopting a multi-segment series switching method, the fluctuation of the motor traction force during the stator winding power supply switching process can be reduced.

[0027] The rotation power supply method for the long-stator linear motor and the long-stator linear motor provided in this application both have the above-mentioned technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] FIG1 is a schematic diagram of a rotation power supply circuit of a long-stator linear motor provided in an embodiment of the present application;

[0030] FIG2 is a schematic diagram of a rotation power supply method for a long-stator linear motor provided in an embodiment of the present application;

[0031] FIG3 is a schematic diagram of power supply of the first long-stator linear motor provided in an embodiment of the present application;

[0032] FIG4 is a schematic diagram of power supply of a second long-stator linear motor provided in an embodiment of the present application;

[0033] FIG5 is a schematic diagram of discharge after switching provided by an embodiment of the present application;

[0034] FIG6 is a schematic diagram of impedance change after switching provided by an embodiment of the present application;

[0035] FIG7 is a schematic diagram of power supply of a third long-stator linear motor provided in an embodiment of the present application;

[0036] FIG8 is a schematic diagram of power supply for the fourth long-stator linear motor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The core of this application is to provide a rotating power supply circuit for a long-stator linear motor. The application of this rotating power supply circuit can increase the speed of stator power switching and reduce the usage of power supply equipment and system complexity. Another core of this application is to provide a rotating power supply method for a long-stator linear motor and a long-stator linear motor, both of which have the above-mentioned technical effects.

[0038] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] Please refer to FIG1 , which is a schematic diagram of a rotating power supply circuit for a long-stator linear motor provided in an embodiment of the present application. Referring to FIG1 , the rotating power supply circuit includes:

[0040] Three-phase stator winding branch 10; the stator winding branch 10 of each phase is connected to the converter, and the stator winding branch 10 of each phase includes N sections of stator windings 101 connected in series, and each section of the stator winding 101 is connected in parallel with a switching circuit 102. When the switching circuit 102 is closed, the parallel stator windings 101 are short-circuited.

[0041] In this embodiment, the rotation power supply circuit includes three-phase stator winding branches 10, namely, U-phase stator winding branch 10, V-phase stator winding branch 10 and W-phase stator winding branch 10. The three-phase stator winding branches 10 are connected to the converter. The U-phase stator winding branch 10 inputs U-phase electricity, the V-phase stator winding branch 10 inputs V-phase electricity, and the W-phase stator winding branch 10 inputs W-phase electricity. Each phase stator winding branch 10 includes N sections of stator windings 101 connected in series, and each section of the stator winding 101 is connected in parallel with a switching circuit 102. When the switching circuit 102 is closed, the stator winding 101 connected in parallel to the switching circuit 102 is short-circuited, and the section of the stator winding 101 is not powered. When the switching circuit 102 is open, the stator winding 101 connected in parallel to the switching circuit 102 is powered. The specific number of stator windings 101 connected in series in the stator winding branch 10 can be set according to actual conditions. The connection gap between the stator windings 101 connected in series in the stator winding branch 10 is very small, almost zero.

[0042] In some embodiments, the lengths of the stator winding 101 in each section of the stator winding branch 10 are equal.

[0043] In this embodiment, the lengths of the stator windings 101 in the same stator winding branch 10 are equal, and the lengths of the stator windings 101 in different stator winding branches 10 are also equal.

[0044] It is clear that the lengths of the stator winding sections 101 in the stator winding branch 10 may not be equal. As for the lengths of the stator winding sections 101, they can be set differently according to actual conditions.

[0045] In some embodiments, the head end of the stator winding branch 10 of each phase is connected to the converter, and the end of the stator winding branch 10 of each phase is connected in a star connection manner.

[0046] In this embodiment, the head end of each phase stator winding branch 10 is connected to the converter, and the end of each phase stator winding branch 10 is connected in a star connection.

[0047] By controlling the closing and opening of the switch circuit 102, the stator winding 101 connected in parallel with the switch circuit 102 can be controlled to be powered or not powered. In order to achieve the same opening and closing of the three phases U, V, and W and ensure the accuracy and synchronization of the three-phase control of U, V, and W, in some embodiments, the switch circuit 102 connected in parallel with the stator winding 101 of the same segment number in the stator winding branch 10 of each phase is controlled by the same control signal.

[0048] In this embodiment, the switch circuits 102 connected in parallel to the stator windings 101 are different, and the switch circuits 102 connected in parallel to the stator windings 101 with the same segment number in each phase stator winding branch 10 are controlled by the same control signal.

[0049] For example, as shown in FIG1 , the U-phase stator winding branch 10, the V-phase stator winding branch 10, and the W-phase stator winding branch 10 each include four stator winding segments 101. The parallel switching circuits 102 connected to the first stator winding segment 101 in the U-phase stator winding branch 10, the first stator winding segment 101 in the V-phase stator winding branch 10, and the first stator winding segment 101 in the W-phase stator winding branch 10 are controlled by the same control signal, which is denoted as control signal 1. The parallel switching circuits 102 connected to the second stator winding segment 101 in the U-phase stator winding branch 10, the second stator winding segment 101 in the V-phase stator winding branch 10, and the second stator winding segment 101 in the W-phase stator winding branch 10 are controlled by the same control signal, which is denoted as control signal 2. The third stator winding segment 101 in the U-phase stator winding branch 10, the third stator winding segment 101 in the V-phase stator winding branch 10, and the switching circuit 102 connected in parallel to the third stator winding segment 101 in the W-phase stator winding branch 10 are controlled by the same control signal, which is denoted as control signal 3. The fourth stator winding segment 101 in the U-phase stator winding branch 10, the fourth stator winding segment 101 in the V-phase stator winding branch 10, and the switching circuit 102 connected in parallel to the fourth stator winding segment 101 in the W-phase stator winding branch 10 are controlled by the same control signal, which is denoted as control signal 4.

[0050] In this way, through the control signal 1, the switch circuit 102 connected in parallel to the first stator winding 101 in the U-phase stator winding branch 10, the first stator winding 101 in the V-phase stator winding branch 10, and the first stator winding 101 in the W-phase stator winding branch 10 can be controlled to close at the same time, and then the first stator winding 101 in the U-phase stator winding branch 10, the first stator winding 101 in the V-phase stator winding branch 10, and the first stator winding 101 in the W-phase stator winding branch 10 can be short-circuited at the same time. By controlling signal 2, the switch circuit 102 connected in parallel to the second stator winding 101 in the U-phase stator winding branch 10, the second stator winding 101 in the V-phase stator winding branch 10, and the second stator winding 101 in the W-phase stator winding branch 10 can be controlled to close at the same time, thereby simultaneously short-circuiting the second stator winding 101 in the U-phase stator winding branch 10, the second stator winding 101 in the V-phase stator winding branch 10, and the second stator winding 101 in the W-phase stator winding branch 10. By analogy, through the control signal 4, the switch circuit 102 connected in parallel to the 4th stator winding 101 in the U-phase stator winding branch 10, the 4th stator winding 101 in the V-phase stator winding branch 10, and the 4th stator winding 101 in the W-phase stator winding branch 10 can be controlled to close at the same time, and then the 4th stator winding 101 in the U-phase stator winding branch 10, the 4th stator winding 101 in the V-phase stator winding branch 10, and the 4th stator winding 101 in the W-phase stator winding branch 10 can be short-circuited at the same time.

[0051] In addition to the above embodiments, the switch circuits 102 connected in parallel to the stator windings 101 of the same segment number in each phase stator winding branch 10 may also be controlled by different control signals.

[0052] The function of the switch circuit 102 is to short-circuit the stator winding 101 connected in parallel with the switch circuit 102 when the switch circuit 102 is closed. Under the condition that the above function can be achieved, the specific structure of the switch circuit 102 can be set differently.

[0053] In order to simplify the circuit structure and reduce the cost, in some embodiments, the switch circuit 102 includes an electronic switch. By controlling the electronic switch to be closed or open, the stator winding 101 can be powered or not powered.

[0054] The stator winding 101 is an energy storage element. When the switch circuit 102 connected in parallel with the stator winding 101 is closed, the stator winding 101 and the switch circuit 102 connected in parallel will form a transient closed loop, and there will be a discharge process, which will cause the stator winding 101 circuit to fluctuate, and the motor traction force will fluctuate. In addition, when the stator winding 101 switches, the switch circuit 102 changes from closed to open, and the motor impedance changes from the zero impedance (or small impedance) of the switch circuit 102 to the large impedance of the stator winding 101. The current takes a long time to establish in this process, which will cause fluctuations. In order to reduce the fluctuation of the stator winding 101 current, the length of the stator winding 101 can be minimized to reduce the impedance. The specific length of the stator winding 101 can be determined in combination with the moving speed of the mover and the switching delay of the electronic switch to ensure that when the mover moves into a certain section of the stator winding 101, the stator winding 101 in that section has started to supply power.

[0055] In summary, the rotating power supply circuit of the long-stator linear motor provided in the present application can control the stator winding to be energized or deenergized by controlling the switch circuit to be closed or opened, which can increase the speed of switching the stator winding power supply. It can also realize live switching, which can effectively reduce the amount of converters and the system load, and reduce line costs. In addition, the degree of liberalization of the rotating power supply circuit control is relatively high, and multiple sections of stator windings can be powered simultaneously by disconnecting the switch circuits connected in parallel to multiple adjacent stator windings. In addition, by reducing the length of the stator winding, increasing the number of segments of the stator winding, and adopting a multi-segment series switching method, the fluctuation of the motor traction force during the stator winding power supply switching process can be reduced.

[0056] The present application further provides a rotating power supply method for a long-stator linear motor. Please refer to FIG2 , which is a schematic diagram of a rotating power supply method for a long-stator linear motor provided in an embodiment of the present application. The method is applied to the rotating power supply circuit of the long-stator linear motor described in the above embodiment, including:

[0057] S101: disconnecting the switch circuits connected in parallel to the m stator winding segments in the stator winding branch circuit to supply power to the m stator winding segments;

[0058] S102: monitoring the moving position of the mover;

[0059] S103: determining a target stator winding according to the moving position of the mover;

[0060] S104: Disconnecting the switch circuit connected in parallel with the target stator winding according to the moving position of the mover.

[0061] Initially, the parallel switching circuits connecting each stator winding are closed. When power is supplied, the parallel switching circuits connecting m stator winding segments in the stator winding branch are first disconnected. m is a positive integer. At this point, m stator winding segments are powered. As the mover moves, the mover's position is monitored, and the target stator winding is determined based on this position, along with the parallel switching circuits disconnected. The target stator winding is the stator winding that will be powered next.

[0062] In some embodiments, the switching circuit for disconnecting the m stator winding segments in parallel in the stator winding branch includes:

[0063] Disconnect the switch circuit of m adjacent stator winding sections in parallel in the stator winding branch; m is greater than or equal to 2.

[0064] Determining the target stator winding according to the moving position of the mover includes:

[0065] When the mover is currently located at the nth section of the stator winding, the n+mth section of the stator winding in the moving direction of the mover is determined as the target stator winding.

[0066] The switching circuit connected in parallel with the target stator winding is disconnected, comprising:

[0067] When the end of the mover leaves the nth section of the stator winding, the switch circuit connected in parallel to the n+mth section of the stator winding is disconnected, and the switch circuit connected in parallel to the nth section of the stator winding is closed.

[0068] In this embodiment, at least two stator winding sections are powered simultaneously, and an m-section series switching strategy is employed. During normal operation, m adjacent stator winding sections are powered simultaneously within the stator winding branch. During stator winding switching, when the end of the mover leaves the nth stator winding section, the switch circuit connected in parallel with the n+mth stator winding section is disconnected, and the switch circuit connected in parallel with the nth stator winding section is closed. The switch circuits connected in parallel with the stator winding sections n+1 through n+m-1 remain disconnected.

[0069] For example, if m is 2, a two-stage series switching strategy is employed. Under normal driving conditions, two adjacent stator windings in the stator winding branch are simultaneously powered. Specifically, under normal driving conditions, when the actuator is at the nth stator winding segment, the switch circuit connecting the nth and n+1st stator winding segments is disconnected, and the nth and n+1st stator winding segments are powered simultaneously. The remaining stator windings are short-circuited by the parallel switch circuits. Under stator winding switching conditions, when the actuator's end leaves the nth stator winding segment, the switch circuit connecting the n+2nd stator winding segment is disconnected, and the switch circuit connecting the nth stator winding segment is closed. The switch circuit connecting the n+1st stator winding segment remains disconnected.

[0070] Taking one stator winding branch as an example, as shown in Figures 3 and 4, when the mover is at the first stator winding section, the switch circuit connecting the first and second stator winding sections in parallel is disconnected, the first and second stator winding sections are powered simultaneously, and the remaining stator windings are short-circuited by the parallel switch circuit. When the end of the mover leaves the first stator winding section, the switch circuit connecting the third stator winding section in parallel is disconnected, and the switch circuit connecting the first stator winding section in parallel is closed. The switch circuit connecting the second stator winding section in parallel remains disconnected. The second and third stator winding sections are powered simultaneously. When the end of the mover leaves the second stator winding section, the switch circuit connecting the fourth stator winding section in parallel is disconnected, and the switch circuit connecting the second stator winding section in parallel is closed. The switch circuit connecting the third stator winding section in parallel remains disconnected. The third and fourth stator winding sections are powered simultaneously. When the end of the mover leaves the third stator winding section, the switch circuit connected in parallel to the fifth stator winding section is opened, and the switch circuit connected in parallel to the third stator winding section is closed. The switch circuit connected in parallel to the fourth stator winding section remains open. The fourth and fifth stator winding sections are powered simultaneously.

[0071] As shown in Figure 5, since the stator winding is an energy storage element, when the switch circuit connected in parallel with the stator winding is closed, the stator winding and the switch circuit connected in parallel will form a transient closed loop, and there will be a discharge process, which will cause the stator winding circuit to fluctuate and the motor traction force to fluctuate. In addition, as shown in Figure 6, when the stator winding is switched, the switch circuit changes from closed to open, and the motor impedance changes from the zero impedance (or small impedance) of the switch circuit to the large impedance of the stator winding. The current takes a long time to establish in this process, which will cause fluctuations. In order to reduce the fluctuation of the stator winding current, the length of the stator winding can be reduced, and a multi-stage series switching strategy can be adopted.

[0072] For example, while reducing the length of the stator winding, a four-segment series switching strategy is adopted. During normal driving, four adjacent stator windings in the stator winding branch are simultaneously powered. That is, during normal driving, when the rotor is at the nth stator winding segment, the parallel switching circuits connecting the nth, n+1th, n+2nd, and n+3rd stator windings are disconnected, and the nth, n+1th, n+2nd, and n+3st stator windings are powered simultaneously. The remaining stator windings are short-circuited by the parallel switching circuits. During stator winding switching, when the rotor end leaves the nth stator winding segment, the parallel switching circuit connecting the n+4th stator winding segment is disconnected, and the parallel switching circuit connecting the nth stator winding segment is closed. The switch circuits connected in parallel to the n+1 stator winding section, the n+2 stator winding section, and the n+3 stator winding section remain disconnected.

[0073] Taking one stator winding branch as an example, as shown in Figures 7 and 8, when the mover is at the first stator winding section, the switch circuit connecting the first to fourth stator winding sections in parallel is disconnected, and the first to fourth stator winding sections are powered simultaneously. The remaining stator windings are short-circuited by the parallel switch circuits. When the end of the mover leaves the first stator winding section, the switch circuit connecting the fifth stator winding section in parallel is disconnected, and the switch circuit connecting the first stator winding section in parallel is closed. The switch circuit connecting the second to fourth stator winding sections in parallel remains disconnected. The second to fifth stator winding sections are powered simultaneously. When the end of the mover leaves the second stator winding section, the switch circuit connecting the sixth stator winding section in parallel is disconnected, and the switch circuit connecting the second stator winding section in parallel is closed. The switching circuit connected in parallel with the third to fifth stator winding sections remains disconnected. Power is supplied to the third to sixth stator winding sections simultaneously. When the end of the mover leaves the third stator winding section, the switching circuit connected in parallel with the seventh stator winding section is disconnected, and the switching circuit connected in parallel with the third stator winding section is closed. The switching circuit connected in parallel with the fourth to seventh stator winding sections remains disconnected. Power is supplied to the fourth to seventh stator winding sections simultaneously. When the end of the mover leaves the fourth stator winding section, the switching circuit connected in parallel with the eighth stator winding section is disconnected, and the switching circuit connected in parallel with the fourth stator winding section is closed. The switching circuit connected in parallel with the fifth to eighth stator winding sections remains disconnected. Power is supplied to the fifth to eighth stator winding sections simultaneously.

[0074] The rotating power supply method for a long-stator linear motor provided in the present application can control the stator winding to be energized or deenergized by controlling the switch circuit to be closed or opened, thereby increasing the speed of switching the stator winding power supply. Furthermore, live switching can be achieved, which can effectively reduce the amount of converters used and the system load, thereby reducing line costs. Furthermore, multiple stator winding sections can be powered simultaneously by disconnecting the switch circuits connected in parallel to multiple adjacent stator windings. Furthermore, by reducing the length of the stator winding, increasing the number of segments of the stator winding, and adopting a multi-segment series switching method, the fluctuation of the motor traction force during the stator winding power supply switching process can be reduced.

[0075] The present application also provides a long stator linear motor, which includes the long stator linear motor rotation power supply circuit as described in the above embodiment. For the long stator linear motor, this application will not be repeated here, and reference can be made to the above embodiment of the rotation power supply circuit.

[0076] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to in detail.

[0077] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0078] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0079] The above is a detailed introduction to the rotating power supply circuit, rotating power supply method and long stator linear motor provided by this application. This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method of this application and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of this application, several improvements and modifications can be made to this application, and these improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A rotating power supply circuit for a long stator linear motor, characterized in that: include: Three-phase stator winding branch; each phase of the stator winding branch is connected to the converter, each phase of the stator winding branch includes N sections of stator windings connected in series, and each section of the stator winding is connected in parallel with a switch circuit, when the switch circuit is closed, the parallel stator windings are short-circuited.

2. The rotation power supply circuit of the long stator linear motor according to claim 1, characterized in that: The switch circuits of the stator windings of the same segment number in each phase of the stator winding branch are connected in parallel and are controlled by the same control signal.

3. The rotation power supply circuit of the long stator linear motor according to claim 1, characterized in that: The head end of the stator winding branch of each phase is connected to the converter, and the end of the stator winding branch of each phase is connected in a star connection manner.

4. The rotation power supply circuit of the long stator linear motor according to claim 1, characterized in that: The lengths of the stator windings in the stator winding branches are equal.

5. The alternating power supply circuit of the long stator linear motor according to claim 1, characterized in that: The switching circuit includes an electronic switch.

6. A method for alternating power supply of a long stator linear motor, characterized in that: A rotating power supply circuit for a long-stator linear motor according to any one of claims 1 to 5, comprising: Disconnecting the switch circuits connected in parallel to the m segments of stator windings in the stator winding branch circuit, so that the m segments of the stator windings are powered; Monitor the moving position of the mover; determining a target stator winding according to the moving position of the mover; The switch circuit connected in parallel with the target stator winding is disconnected according to the moving position of the mover.

7. The method for alternating power supply of a long stator linear motor according to claim 6, characterized in that: The switch circuit for disconnecting the m stator winding sections in parallel in the stator winding branch includes: Disconnect the switch circuit of m adjacent stator winding sections in parallel in the stator winding branch; m is greater than or equal to 2.

8. The rotating power supply method according to claim 7, characterized in that: The step of determining the target stator winding according to the moving position of the mover comprises: When the mover is currently located at the nth section of the stator winding, the n+mth section of the stator winding in the moving direction of the mover is determined as the target stator winding.

9. The rotating power supply method according to claim 8, characterized in that: The method of disconnecting the switch circuit connected in parallel with the target stator winding according to the moving position of the mover comprises: When the end of the mover leaves the nth section of the stator winding, the switch circuit connected in parallel to the n+mth section of the stator winding is disconnected, and the switch circuit connected in parallel to the nth section of the stator winding is closed.

10. A long stator linear motor, characterized in that: A rotation power supply circuit comprising a long stator linear motor as described in any one of claims 1 to 5.

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