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

Abstract

The invention discloses an alternating power supply circuit of a long-stator linear motor, and relates to the technical field of motors. Each phase of stator winding branch is connected with a converter, each phase of stator winding branch comprises N sections of stator windings which are connected in series, each section of stator winding is connected with a switching circuit in parallel, and when the switching circuit is closed, the stator windings which are connected in parallel are short-circuited. By applying the alternating power supply circuit of the long-stator linear motor, the stator switching power supply speed can be improved, and the usage amount of power supply equipment and the system complexity are reduced. The invention further discloses an alternating power supply method of the long-stator linear motor and the long-stator linear motor, which have the above technical effects.

Description

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; it also relates to a rotation power supply method for a long-stator linear motor and a long-stator linear motor. Background Art

[0002] Linear motors are new motors that can directly convert electrical energy into mechanical energy of linear motion, and have broad application prospects in rail transit and other fields. Long-stator linear motors can be used as the core driving part of rail transit, which is of great significance to the development of rail transit. The key to the long-stator linear motor drive system is power supply. The power supply method is to provide the stator with alternating current with variable amplitude and frequency through the converter, and then provide the mover with the power required for operation through electromagnetic coupling. For long-stator linear motors, the stators are laid on the entire line as required, so it is difficult to power all stators at the same time, and it will also cause great energy loss, which will greatly reduce the efficiency of the motor drive system. For long-stator linear motors, only the part of the mover coupled to the stator is truly involved in the electromechanical energy conversion. Therefore, it is only necessary to ensure that the stator where the mover is located is powered to achieve the normal operation of the mover, that is, the stator is powered in sections.

[0003] At present, the stator segment rotation power supply methods of long stator linear motors mainly include two-step method and three-step method. The two-step method requires two sets of power supply equipment, each set of power supply equipment supplies power to the stator of the fixed track on one side. During the stator switching process, the power switch of the stator that the mover is about to leave is first turned off, and the output current of the converter is reduced to zero; then the power switch of the stator segment that the mover is about to enter is closed, and the output current of the converter is increased. When changing steps, the driving force will have a certain jitter and loss. The three-step method requires three sets of power supply equipment to supply power to the stator segments on both sides in turn, avoiding the jitter and loss of the driving force of the mover during the stator segment switching process in the two-step method, but there are many power supply equipment and the system is complicated. In ultra-high-speed linear drive, stator segment power supply is also required, but because the mover moves very fast, the switching of the power switch and the switching of the converter in the above two rotation power supply methods takes a long time, which will seriously affect the continuity and stability of the drive force of the mover during the operation of the ultra-high-speed linear drive, thereby affecting the final 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 technical personnel in this field. Summary of the invention

[0005] The purpose of the present application is to provide a rotating power supply circuit for a long stator linear motor, which can increase the speed of stator power switching and reduce the usage of power supply equipment and system complexity. Another purpose of the present 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 technical effects.

[0006] In order to solve the above technical problems, the present application provides a rotation power supply circuit for a long stator linear motor, comprising:

[0007] 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.

[0008] Optionally, the switching circuits of the stator windings with the same segment number in each phase of the stator winding branch are connected in parallel and are controlled by the same control signal.

[0009] 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.

[0010] Optionally, the lengths of the stator windings in each section of the stator winding branch are equal.

[0011] Optionally, the switching circuit includes an electronic switch.

[0012] In order to solve the above technical problems, the present application also 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:

[0013] 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;

[0014] Monitor the moving position of the mover;

[0015] determining a target stator winding according to the moving position of the mover;

[0016] The switch circuit connected in parallel with the target stator winding is disconnected according to the moving position of the mover.

[0017] Optionally, the switching circuit for disconnecting the m stator winding segments in parallel in the stator winding branch includes:

[0018] 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.

[0019] Optionally, determining the target stator winding according to the moving position of the mover includes:

[0020] 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.

[0021] Optionally, disconnecting the switch circuit connected in parallel with the target stator winding according to the moving position of the mover includes:

[0022] 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.

[0023] In order to solve the above technical problems, the present application also provides a long-stator linear motor, including the rotating power supply circuit of the long-stator linear motor as described above.

[0024] 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 inverter, and 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 switching circuit. When the switching circuit is closed, the parallel stator windings are short-circuited.

[0025] 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, and can improve the speed of switching the stator winding power supply. And it can realize live switching, which can effectively reduce the amount of converters and the system complexity, and reduce line costs. And 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.

[0026] The rotation power supply method of the long-stator linear motor and the long-stator linear motor provided in the present application both have the above-mentioned technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the prior art and the drawings required for use in the embodiments will be briefly introduced below. 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 paying creative work.

[0028] Figure 1A schematic diagram of a rotation power supply circuit of a long-stator linear motor provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of a rotation power supply method for a long-stator linear motor provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of power supply for the first long-stator linear motor provided in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of power supply for the second long-stator linear motor provided in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of post-switching discharge provided in an embodiment of the present application;

[0033] Figure 6 A schematic diagram of impedance change after switching provided in an embodiment of the present application;

[0034] Figure 7 A schematic diagram of power supply for a third type of long-stator linear motor provided in an embodiment of the present application;

[0035] Figure 8 This is a schematic diagram of power supply for the fourth long-stator linear motor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] 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 switching power supply 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.

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] Please refer to Figure 1 , Figure 1 A schematic diagram of a rotating power supply circuit of a long stator linear motor provided in an embodiment of the present application, with reference to Figure 1 As shown, the rotation power supply circuit includes:

[0039] A three-phase stator winding branch 10; each phase of the stator winding branch 10 is connected to the converter, each phase of the 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 switch circuit 102. When the switch circuit 102 is closed, the parallel stator windings 101 are short-circuited.

[0040] In this embodiment, the rotation power supply circuit includes a three-phase stator winding branch 10, which is a U-phase stator winding branch 10, a V-phase stator winding branch 10 and a W-phase stator winding branch 10. The three-phase stator winding branch 10 is 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 of the 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 switch circuit 102. When the switch circuit 102 is closed, the stator winding 101 connected in parallel to the switch circuit 102 is short-circuited, and the section of the stator winding 101 is not powered. When the switch circuit 102 is disconnected, the stator winding 101 connected in parallel to the switch circuit 102 is powered. The specific number of the stator windings 101 connected in series in the stator winding branch 10 can be set appropriately according to the actual situation. The connection gap between the stator windings 101 connected in series in the stator winding branch 10 is very small, almost zero.

[0041] In some embodiments, the lengths of the stator winding 101 in each section of the stator winding branch 10 are equal.

[0042] In this embodiment, the lengths of the various sections of the stator winding 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.

[0043] It is clear that the lengths of the various sections of stator winding 101 in the stator winding branch 10 may not be equal. As for the lengths of the various sections of stator winding 101, they may be differently set according to actual conditions.

[0044] 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.

[0045] 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.

[0046] By controlling the switching circuit 102 to close and open, the stator winding 101 connected in parallel with the switching circuit 102 can be controlled to be powered or not powered. In order to realize the 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 switching circuit 102 connected in parallel to the stator winding 101 with the same segment number in the stator winding branch 10 of each phase is controlled by the same control signal.

[0047] 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 the stator winding branches 10 of each phase are controlled by the same control signal.

[0048] For example, Figure 1 As shown, the U-phase stator winding branch 10, the V-phase stator winding branch 10 and the W-phase stator winding branch 10 all include four sections of stator windings 101. The switch circuit 102 connected in parallel to the first section of stator winding 101 in the U-phase stator winding branch 10, the first section of stator winding 101 in the V-phase stator winding branch 10 and the first section of stator winding 101 in the W-phase stator winding branch 10 is controlled by the same control signal, which is recorded as control signal 1. The switch circuit 102 connected in parallel to the second section of stator winding 101 in the U-phase stator winding branch 10, the second section of stator winding 101 in the V-phase stator winding branch 10 and the second section of stator winding 101 in the W-phase stator winding branch 10 is controlled by the same control signal, which is recorded as control signal 2. The third stator winding 101 in the U-phase stator winding branch 10, the third stator winding 101 in the V-phase stator winding branch 10, and the switch circuit 102 connected in parallel to the third stator winding 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 101 in the U-phase stator winding branch 10, the fourth stator winding 101 in the V-phase stator winding branch 10, and the switch circuit connected in parallel to the fourth stator winding 101 in the W-phase stator winding branch 10 are controlled by the same control signal, which is denoted as control signal 4.

[0049] In this way, through the control signal 1, the switch circuit 102 connected in parallel to the first stator winding section 101 in the U-phase stator winding branch 10, the first stator winding section 101 in the V-phase stator winding branch 10, and the first stator winding section 101 in the W-phase stator winding branch 10 can be controlled to close at the same time, and then the first stator winding section 101 in the U-phase stator winding branch 10, the first stator winding section 101 in the V-phase stator winding branch 10, and the first stator winding section 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 closed at the same time, and then 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 short-circuited at the same time. By analogy, through the control signal 4, the switch circuit 102 connected in parallel to the 4th stator winding section 101 in the U-phase stator winding branch 10, the 4th stator winding section 101 in the V-phase stator winding branch 10, and the 4th stator winding section 101 in the W-phase stator winding branch 10 can be controlled to be closed at the same time, and then the 4th stator winding section 101 in the U-phase stator winding branch 10, the 4th stator winding section 101 in the V-phase stator winding branch 10, and the 4th stator winding section 101 in the W-phase stator winding branch 10 can be short-circuited at the same time.

[0050] In addition to the above-mentioned 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.

[0051] 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.

[0052] 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 opened, the stator winding 101 can be powered or not powered.

[0053] 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 will fluctuate. In addition, when the stator winding 101 is switched, 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 current of the stator winding 101, 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 section of the stator winding 101 has started to supply power.

[0054] 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, and can improve the speed of switching the stator winding power supply. And it can realize live switching, which can effectively reduce the amount of converters and the system complexity, and reduce line costs. And 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.

[0055] This application also provides a method for rotating power supply of a long stator linear motor, please refer to Figure 2 , Figure 2 A schematic diagram of a rotation power supply method for a long stator linear motor provided in an embodiment of the present application, the method is applied to the rotation power supply circuit of the long stator linear motor described in the above embodiment, comprising:

[0056] S101: disconnecting the switch circuits connected in parallel to the m stator windings in the stator winding branch, so that the m stator windings are powered;

[0057] S102: monitoring the moving position of the mover;

[0058] S103: determining a target stator winding according to the moving position of the mover;

[0059] S104: disconnecting the switch circuit connected in parallel with the target stator winding according to the moving position of the mover.

[0060] In the initial state, the switch circuits connected in parallel to each stator winding are in a closed state. When the power supply starts, the switch circuits connected in parallel to the m stator windings in the stator winding branch are first disconnected. m is a positive integer. At this time, there are m stator windings in the stator winding that are powered. During the movement of the mover, the moving position of the mover is monitored, and the target stator winding is determined and the switch circuit connected in parallel to the target stator winding is disconnected accordingly. The so-called target stator winding refers to the stator winding that is used for power supply next.

[0061] In some embodiments, the switching circuit for disconnecting the m stator winding segments in parallel in the stator winding branch includes:

[0062] 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.

[0063] Determining the target stator winding according to the moving position of the mover includes:

[0064] 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.

[0065] The switching circuit disconnecting the target stator winding in parallel comprises:

[0066] 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.

[0067] In this embodiment, at least two stator windings are powered at the same time, and this embodiment adopts an m-segment series switching strategy. In the normal driving state, m adjacent stator windings are powered at the same time in the stator winding branch. In the stator winding switching state, when the end of the mover leaves the nth stator winding, the switch circuit connected in parallel with the n+mth stator winding is disconnected, and the switch circuit connected in parallel with the nth stator winding is closed. The switch circuits connected in parallel with the n+1th stator winding to the n+m-1th stator winding remain disconnected.

[0068] For example, m is 2, that is, a two-stage series switching strategy is adopted. In the normal driving state, two adjacent stator windings are powered at the same time in the stator winding branch, that is, in the normal driving state, when the mover is at the nth stator winding, the switch circuit connected in parallel with the nth stator winding and the n+1th stator winding is disconnected, the nth stator winding and the n+1th stator winding are powered at the same time, and the remaining stator windings are short-circuited by the parallel switch circuit. In the stator winding switching state, when the end of the mover leaves the nth stator winding, the switch circuit connected in parallel with the n+2th stator winding is disconnected, and the switch circuit connected in parallel with the nth stator winding is closed. The switch circuit connected in parallel with the n+1th stator winding remains disconnected.

[0069] Take one of the stator winding branches as an example, refer to Figure 3 and Figure 4 As shown, when the mover is at the first section of the stator winding, the switch circuit connected in parallel with the first section of the stator winding and the second section of the stator winding is disconnected, the first section of the stator winding and the second section of the stator winding are powered at the same time, and the remaining stator windings are short-circuited by the parallel switch circuit. When the end of the mover leaves the first section of the stator winding, the switch circuit connected in parallel with the third section of the stator winding is disconnected, and the switch circuit connected in parallel with the first section of the stator winding is closed. The switch circuit connected in parallel with the second section of the stator winding remains disconnected. The second section of the stator winding and the third section of the stator winding are powered at the same time. When the end of the mover leaves the second section of the stator winding, the switch circuit connected in parallel with the fourth section of the stator winding is disconnected, and the switch circuit connected in parallel with the second section of the stator winding is closed. The switch circuit connected in parallel with the third section of the stator winding remains disconnected. The third section of the stator winding and the fourth section of the stator winding are powered at the same time. When the end of the mover leaves the third stator winding, the switch circuit connected in parallel with the fifth stator winding is disconnected, and the switch circuit connected in parallel with the third stator winding is closed. The switch circuit connected in parallel with the fourth stator winding remains disconnected. The fourth stator winding and the fifth stator winding are powered at the same time.

[0070] refer to Figure 5 As shown, 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 to fluctuate. In addition, refer to Figure 6 As shown in the figure, when the stator winding is switched, the switch circuit changes from closed to open, and the motor impedance changes from zero impedance (or small impedance) of the switch circuit to large impedance of the stator winding. The current takes a long time to build up 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.

[0071] For example, while reducing the length of the stator winding, a 4-stage series switching strategy is adopted. In the normal driving state, there are 4 adjacent stator windings in the stator winding branch that are powered at the same time, that is, in the normal driving state, when the mover is at the nth stator winding, the switch circuit connected in parallel to the nth stator winding, the n+1st stator winding, the n+2nd stator winding, and the n+3rd stator winding is disconnected, and the nth stator winding, the n+1st stator winding, the n+2nd stator winding, and the n+3rd stator winding are powered at the same time, and the remaining stator windings are short-circuited by the parallel switch circuits. In the stator winding switching state, when the end of the mover leaves the nth stator winding, the switch circuit connected in parallel to the n+4th stator winding is disconnected, and the switch circuit connected in parallel to the nth stator winding is closed. The switch circuits connected in parallel to the n+1 stator winding segment, the n+2 stator winding segment, and the n+3 stator winding segment remain disconnected.

[0072] Take one of the stator winding branches as an example, refer to Figure 7 and Figure 8 As shown, when the mover is at the first stator winding, the switch circuit connected in parallel to the first stator winding to the fourth stator winding is disconnected, the first stator winding to the fourth stator winding are powered at the same time, and the remaining stator windings are short-circuited by the switch circuit connected in parallel. When the end of the mover leaves the first stator winding, the switch circuit connected in parallel to the fifth stator winding is disconnected, and the switch circuit connected in parallel to the first stator winding is closed. The switch circuit connected in parallel to the second stator winding to the fourth stator winding remains disconnected. The second stator winding to the fifth stator winding are powered at the same time. When the end of the mover leaves the second stator winding, the switch circuit connected in parallel to the sixth stator winding is disconnected, and the switch circuit connected in parallel to the second stator winding is closed. The switch circuit connected in parallel to the third stator winding to the fifth stator winding remains disconnected. The third to sixth stator windings are powered at the same time. When the end of the mover leaves the third stator winding, the switch circuit connected in parallel with the seventh stator winding is disconnected, and the switch circuit connected in parallel with the third stator winding is closed. The switch circuit connected in parallel with the fourth to seventh stator windings remains disconnected. The fourth to seventh stator windings are powered at the same time. When the end of the mover leaves the fourth stator winding, the switch circuit connected in parallel with the eighth stator winding is disconnected, and the switch circuit connected in parallel with the fourth stator winding is closed. The switch circuit connected in parallel with the fifth to eighth stator windings remains disconnected. The fifth to eighth stator windings are powered at the same time.

[0073] The rotating power supply method of the long stator linear motor provided in the present application can control the stator winding to be powered on or off by controlling the switch circuit to be closed or opened, and can improve 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, 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-section series switching method, the fluctuation of the motor traction force during the stator winding power supply switching process can be reduced.

[0074] 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, the present application will not repeat it here, and the above embodiment of the rotation power supply circuit can be referred to.

[0075] 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 referenced to each other.

[0076] 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 composition and steps of each example have been generally described in the above description according to function. 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 to be beyond the scope of this application.

[0077] The steps of the method or algorithm 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), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0078] The above is a detailed introduction to the rotating power supply circuit, rotating power supply method and long stator linear motor of the long stator linear motor provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present 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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