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

Abstract

Disclosed are a switching power supply circuit, a switching power supply method, and a long-stator linear motor for a long-stator linear motor, relating to the motor technology field. The switching power supply circuit for the long-stator linear motor includes a three-phase stator winding branch circuit, each phase of the stator winding branch circuit is connected to a converter, each phase of the stator winding branch circuit includes N-segment stator windings connected in series, and a switch circuit is connected in parallel to each segment of the stator winding, so that when the switch circuit is turned on, it short-circuits the parallel-connected stator windings. By using this switching power supply circuit for the long-stator linear motor, the speed of stator switching power supply can be improved, reducing the amount of power supply equipment used and the complexity of the system.

Description

Technical Field

[0001] This application relates to the technical field of motors, and particularly to the alternating power supply circuit of a long stator linear motor. Furthermore, it relates to the alternating power supply method of a long stator linear motor and a long stator linear motor.

Background Art

[0002] A linear motor is a new type of motor that can directly convert electrical energy into mechanical energy of linear motion, and has broad application prospects in fields such as railway transportation. As the main driving part of railway transportation, the long stator linear motor has important significance for the development of railway transportation. In the driving system of a long stator linear motor, power supply is the most important. The power supply method is to provide the stator with alternating current power whose amplitude value and frequency are both variable by a converter, and then provide the rotor with the power required for operation through electromagnetic coupling. For a long stator linear motor, since the stator is laid along the entire line according to needs, it is difficult to achieve simultaneous power supply to all stators, which brings large energy losses and greatly reduces the efficiency of the motor driving system. For a long stator linear motor, only the coupling part between the rotor and the stator actually participates in the electrical-mechanical energy conversion. Therefore, if the power supply to the stator where the rotor is located is guaranteed, the normal operation of the rotor can be realized, that is, segmented power supply is performed on the stator.

[0003] Currently, there are two main methods for alternating power supply to the stator segments of long-stator linear motors: the two-step method and the three-step method. In the two-step method, two sets of power supply equipment are required, and each set of equipment supplies power to the stator of the fixed-side railway. During the stator switching process, first, the power supply switch of the stator that the rotor is about to move away from is turned off, reducing the converter's output current to zero. Then, the power supply switch of the stator segment that the rotor is about to move into is turned on, increasing the converter's output current. During step switching, a certain fluctuation and loss occurs in the driving force. In the three-step method, three sets of power supply equipment are used to alternately supply power to the stator segments on both sides. This avoids the fluctuation and loss of rotor driving force during the stator segment switching process in the two-step method, but it requires more power supply equipment and makes the system more complex. In ultra-high-speed linear drive systems, segmented power supply to the stator is also required, but the rotor's movement speed is extremely high, and the switching of the power supply switch and converter in the two alternating power supply methods described above takes time. This severely affects the sustainability and stability of the rotor's driving force during the operation of the ultra-high-speed linear drive, and thus affects the final target speed and the stability of the driven object.

[0004] In light of this, how to improve the speed of stator switching power supply and reduce the amount of power supply equipment used and the complexity of the system becomes a technical problem that those skilled in the art seek to solve. [Overview of the project] [Problems that the invention aims to solve]

[0005] This application aims to provide an alternating power supply circuit for a long-stator linear motor. By using this alternating power supply circuit, the speed of stator switching power supply can be improved, reducing the amount of power supply equipment used and the complexity of the system. This application also aims to provide an alternating power supply method for a long-stator linear motor and a long-stator linear motor, both of which have the above technical effects. [Means for solving the problem]

[0006] To solve the above technical problems, this application provides an alternating power supply circuit for a long-stator linear motor. The system includes a three-phase stator winding branch circuit, where each phase of the stator winding branch circuit is connected to a converter, and each phase of the stator winding branch circuit includes N-segment stator windings connected in series, with a switch circuit connected in parallel to each segment of the stator winding, which, when the switch circuit is turned on, short-circuits the parallel-connected stator windings.

[0007] Preferably, in the stator winding branch circuit of each phase, the switch circuits connected in parallel to the stator winding having the same segment number are controlled by the same control signal.

[0008] Preferably, the leading edge of the stator winding branch circuit for each phase is connected to the converter, and the trailing edges of the stator winding branch circuit for each phase are connected in a star configuration.

[0009] Preferably, the lengths of the stator windings in each segment of the stator winding branch circuit are equal.

[0010] Preferably, the switch circuit includes an electronic switch.

[0011] To solve the above technical problems, this application further provides a method for alternate power supply of a long-stator linear motor, which is applied to the alternate power supply circuit of the long-stator linear motor described above. In a stator winding branch circuit, the step of turning off a switch circuit connected in parallel to the stator winding of the m segment to supply power to the stator winding of the m segment, A step of monitoring the rotor's movement position, The steps include determining a target stator winding based on the rotor's movement position, The process includes the step of turning off a switch circuit connected in parallel to the target stator winding based on the moving position of the rotor.

[0012] Preferably, the step of turning off a switch circuit connected in parallel to the stator winding of an m-segment in a stator winding branch circuit is: The stator winding branch circuit includes the step of turning off a switch circuit that is connected in parallel to the stator winding of an adjacent m segment, where m is 2 or greater.

[0013] Preferably, the step of determining the target stator winding based on the rotor's movement position is: Currently, when the rotor is located on n segments of the stator winding, the process includes determining the n+m segments of the stator winding in the direction of movement of the rotor as the target stator winding.

[0014] Preferably, the step of turning off the switch circuit connected in parallel to the target stator winding based on the rotor's movement position is: The process includes the step of turning off the switch circuit connected in parallel to the n+m segment stator winding and turning on the switch circuit connected in parallel to the n segment stator winding when the end of the rotor separates from the n segment stator winding.

[0015] To solve the above technical problems, this application further provides a long-stator linear motor, including an alternating power supply circuit for the long-stator linear motor described above.

[0016] The alternating power supply circuit for the long-stator linear motor provided in this application includes a three-phase stator winding branch circuit, each of which is connected to a converter, and each of which includes N-segment stator windings connected in series, with a switch circuit connected in parallel to each of the stator windings of each segment, and when the switch circuit is turned on, it short-circuits the stator windings connected in parallel. [Effects of the Invention]

[0017] Thus, in the alternating power supply circuit of the long stator linear motor provided by the present application, by controlling the switch circuit to be turned on or off, the stator winding is controlled to be powered on or powered off, so that the speed of switching the stator winding for power supply can be improved. The realization of charge switching effectively reduces the usage amount of the converter and the complexity of the system, and further reduces the wiring cost. In addition, the degree of freedom in controlling the alternating power supply circuit is high. By turning off the switch circuits connected in parallel to a plurality of adjacent stator windings, simultaneous power supply to the stator windings of multiple segments can be realized. Also, by shortening the length of the stator winding, increasing the number of segments of the stator winding, and adopting a method of switching connection in multiple segments in series, the fluctuation of the traction force of the motor can be reduced during the process of switching power supply to the stator winding.

[0018] Both the alternating power supply method of the long stator linear motor provided by the present application and the long stator linear motor have the above technical effects.

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the necessary drawings of the prior art and the embodiments. The drawings described below are only some embodiments of the present application. For those skilled in the art, on the premise of not performing labor worthy of inventive step, other drawings can be obtained based on these drawings.

Brief Description of the Drawings

[0020] [Figure 1] It is a schematic diagram of the alternating power supply circuit of the long stator linear motor provided by the embodiment of the present application. [Figure 2] It is a schematic diagram of the alternating power supply method of the long stator linear motor provided by the embodiment of the present application. [Figure 3] It is a power supply schematic diagram of the first long stator linear motor provided by the embodiment of the present application. [Figure 4] It is a power supply schematic diagram of the second long stator linear motor provided by the embodiment of the present application. [Figure 5]It is a schematic diagram of the discharge mode after switching provided by an embodiment of the present application. [Figure 6] It is a schematic diagram of the resistance change after switching provided by an embodiment of the present application. [Figure 7] It is a power supply schematic diagram of the third long stator linear motor provided by an embodiment of the present application. [Figure 8] It is a power supply schematic diagram of the fourth long stator linear motor provided by an embodiment of the present application.

Embodiment for Implementing the Invention

[0021] The main purpose of the present application is to provide an alternating power supply circuit for a long stator linear motor. By using the alternating power supply circuit, the speed of the switched power supply of the stator can be improved, and the usage amount of the power supply equipment and the complexity of the system can be reduced. Another main purpose of the present application is to provide an alternating power supply method for a long stator linear motor and a long stator linear motor, both of which have the above technical effects.

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, hereinafter, in combination with the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. The described embodiments are not all embodiments of the present application, but some embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained without the need for creative labor by those skilled in the art belong to the protection scope of the present application.

[0023] Referring to FIG. 1, FIG. 1 is a schematic diagram of an alternating power supply circuit for a long stator linear motor provided by an embodiment of the present application. As shown in FIG. 1, the alternating power supply circuit includes a three-phase stator winding branch circuit 10. Each phase of the stator winding branch circuit 10 is connected to a converter. Each phase of the stator winding branch circuit 10 includes N segments of stator windings 101 connected in series. A switch circuit 102 is connected in parallel to each segment of the stator winding 101. When the switch circuit 102 is turned on, the parallel-connected stator windings 101 are short-circuited.

[0024] In this embodiment, the alternating power supply circuit includes three phase stator winding branch circuits 10: a U-phase stator winding branch circuit 10, a V-phase stator winding branch circuit 10, and a W-phase stator winding branch circuit 10. The three phase stator winding branch circuits 10 are connected to a converter. The U-phase stator winding branch circuit 10 receives U-phase power, the V-phase stator winding branch circuit 10 receives V-phase power, and the W-phase stator winding branch circuit 10 receives W-phase power. Each phase stator winding branch circuit 10 includes N-segment stator windings 101 connected in series, and a switch circuit 102 is connected in parallel to each segment's stator winding 101. When the switch circuit 102 is turned on, the stator windings 101 connected in parallel to the switch circuit 102 are short-circuited, and the stator windings 101 of that segment are not powered. When the switch circuit 102 is turned off, the stator winding 101 connected in parallel to the switch circuit 102 is powered. The specific number of stator windings 101 connected in series in the stator winding branch circuit 10 should be set appropriately according to the actual situation. The connection gap between the stator windings 101 connected in series in the stator winding branch circuit 10 is very small, almost zero.

[0025] In some embodiments, the lengths of the stator windings 101 in each segment of the stator winding branch circuit 10 are equal.

[0026] In this embodiment, the lengths of the stator windings 101 in each segment of the same stator winding branch circuit 10 are equal, and the lengths of the stator windings 101 in different stator winding branch circuits 10 are also equal.

[0027] Here, the lengths of the stator windings 101 in each segment of the stator winding branch circuit 10 do not all have to be equal. The lengths of the stator windings 101 in each segment may be set individually according to the actual situation.

[0028] In some embodiments, the leading edge of the stator winding branch circuit 10 for each phase is connected to the converter, and the trailing edges of the stator winding branch circuit 10 for each phase are connected in a star configuration.

[0029] In this embodiment, the leading edge of each phase's stator winding branch circuit 10 is connected to the converter, and the trailing edges of each phase's stator winding branch circuit 10 are connected using a star connection method.

[0030] By controlling the switch circuit 102 to be on or off, the power supply and depower supply to the stator winding 101 connected in parallel to the switch circuit 102 can be controlled, enabling simultaneous switching of the three phases U, V, and W. In order to ensure the accuracy and synchronization of the control of the three phases U, V, and W, in some embodiments, the switch circuit 102 connected in parallel to the stator winding 101 having the same segment number in the stator winding branch circuit 10 of each phase is controlled by the same control signal.

[0031] In this embodiment, the switch circuits 102 connected in parallel to each stator winding 101 are different, and the switch circuits 102 connected in parallel to the stator winding 101 having the same segment number in each phase's stator winding branch circuit 10 are controlled by the same control signal.

[0032] For example, as shown in Figure 1, the U-phase stator winding branch circuit 10, the V-phase stator winding branch circuit 10, and the W-phase stator winding branch circuit 10 all include a 4-segment stator winding 101. The switch circuit 102 connected in parallel to the first segment stator winding 101 in the U-phase stator winding branch circuit 10, the first segment stator winding 101 in the V-phase stator winding branch circuit 10, and the first segment stator winding 101 in the W-phase stator winding branch circuit 10 is controlled by the same control signal, which is denoted as control signal 1. The switch circuit 102 connected in parallel to the second segment stator winding 101 in the U-phase stator winding branch circuit 10, the second segment stator winding 101 in the V-phase stator winding branch circuit 10, and the second segment stator winding 101 in the W-phase stator winding branch circuit 10 is controlled by the same control signal, and this control signal is denoted as control signal 2. The switch circuit 102 connected in parallel to the third segment stator winding 101 in the U-phase stator winding branch circuit 10, the third segment stator winding 101 in the V-phase stator winding branch circuit 10, and the third segment stator winding 101 in the W-phase stator winding branch circuit 10 is controlled by the same control signal, and this control signal is denoted as control signal 3. The switch circuits connected in parallel to the fourth segment stator winding 101 in the U-phase stator winding branch circuit 10, the fourth segment stator winding 101 in the V-phase stator winding branch circuit 10, and the fourth segment stator winding 101 in the W-phase stator winding branch circuit 10 are controlled by the same control signal, which is denoted as control signal 4.

[0033] In this way, the control signal 1 can simultaneously control the switch circuit 102 connected in parallel to the first segment stator winding 101 in the U-phase stator winding branch circuit 10, the first segment stator winding 101 in the V-phase stator winding branch circuit 10, and the first segment stator winding 101 in the W-phase stator winding branch circuit 10 to turn on, and furthermore, the first segment stator winding 101 in the U-phase stator winding branch circuit 10, the first segment stator winding 101 in the V-phase stator winding branch circuit 10, and the first segment stator winding 101 in the W-phase stator winding branch circuit 10 can be simultaneously short-circuited. The control signal 2 can simultaneously control the switch circuit 102 connected in parallel to the second segment stator winding 101 in the U-phase stator winding branch circuit 10, the second segment stator winding 101 in the V-phase stator winding branch circuit 10, and the second segment stator winding 101 in the W-phase stator winding branch circuit 10 to turn on, and furthermore, the second segment stator winding 101 in the U-phase stator winding branch circuit 10, the second segment stator winding 101 in the V-phase stator winding branch circuit 10, and the second segment stator winding 101 in the W-phase stator winding branch circuit 10 can be simultaneously short-circuited. By analogy, the control signal 4 can simultaneously control the switch circuit 102 connected in parallel to the fourth segment stator winding 101 in the U-phase stator winding branch circuit 10, the fourth segment stator winding 101 in the V-phase stator winding branch circuit 10, and the fourth segment stator winding 101 in the W-phase stator winding branch circuit 10 to turn on, and furthermore, the fourth segment stator winding 101 in the U-phase stator winding branch circuit 10, the fourth segment stator winding 101 in the V-phase stator winding branch circuit 10, and the fourth segment stator winding 101 in the W-phase stator winding branch circuit 10 can be simultaneously short-circuited.

[0034] In addition to the embodiments described above, the switch circuits 102 connected in parallel to the stator windings 101 having the same segment number in each phase of the stator winding branch circuit 10 may be controlled by different control signals.

[0035] If the function of the switch circuit 102 is to short-circuit the stator winding 101 connected in parallel when the switch circuit 102 is turned on, thereby achieving the above function, then the specific structure of the switch circuit 102 may be individually installed.

[0036] In order to simplify the circuit structure and reduce costs, in some embodiments, the switch circuit 102 includes an electronic switch. By controlling the electronic switch to turn on and off, it is possible to control the power supply and depower supply of the stator winding 101.

[0037] The stator winding 101 is an energy storage element. When the switch circuit 102, which is connected in parallel to the stator winding 101, is turned on, the stator winding 101 and the switch circuit 102 form a transient closed circuit, a discharge process occurs, and the circuit of the stator winding 101 fluctuates, causing a fluctuation in the traction force of the motor. Also, when switching the stator winding 101, the switch circuit 102 changes from on to off, and the motor's resistance changes from zero resistance (or low resistance) of the switch circuit 102 to a large resistance of the stator winding 101. In this process, the rise time of the current is long, and fluctuations occur. To reduce the fluctuation of the current in the stator winding 101, the resistance is reduced by making the length of the stator winding 101 as short as possible. The specific length of the stator winding 101 is determined by combining the rotor's movement speed and the switching delay of the electronic switch, thereby ensuring that when the rotor moves to a stator winding 101 in a given segment, power supply to that segment's stator winding 101 has already begun.

[0038] As described above, in the alternating power supply circuit for a long-stator linear motor provided in this application, the stator windings can be controlled to either be energized or de-energized by controlling the switch circuit to be on or off, thereby improving the speed at which the stator windings are switched and powered. By achieving static switching, the amount of converter used and the complexity of the system are effectively reduced, and wiring costs are further reduced. In addition, the degree of control of the alternating power supply circuit is high, and by turning off the switch circuits connected in parallel to multiple adjacent stator windings, simultaneous power supply to multiple segments of the stator windings can be achieved. Furthermore, by shortening the length of the stator windings and increasing the number of segments of the stator windings, and by adopting a multi-segment series connection switching method, fluctuations in the motor's traction force during the stator winding switching power supply process can be reduced.

[0039] This application further provides a method for alternate power supply of a long-stator linear motor, referring to Figure 2, which is a schematic diagram of the alternate power supply method for a long-stator linear motor provided in an embodiment of this application, the method being applied to the alternate power supply circuit for a long-stator linear motor described in the above embodiment, and includes the following steps: S101: In order to supply power to the stator winding of the m segment, the switch circuit connected in parallel to the stator winding of the m segment in the stator winding branch circuit is turned off; S102: Monitor the rotor's movement position; S103: Determine the target stator winding based on the rotor's movement position; S104: Based on the rotor's movement position, the switch circuit connected in parallel to the target stator winding is turned off.

[0040] In the initial state, the switch circuits connected in parallel to each stator winding are in the ON state. When power supply begins, first, the switch circuits connected in parallel to the m-segment stator windings in the stator winding branch circuit are turned OFF. M is a positive integer. At this time, the m-segment stator windings receive power. During the rotor's movement, the rotor's position is monitored, and based on this, the target stator winding is determined, and the switch circuits connected in parallel to the target stator winding are turned OFF. The target stator winding is, from now on, the stator winding for power supply.

[0041] In some embodiments, the step of turning off a switch circuit connected in parallel to the m-segment stator winding in a stator winding branch circuit is: The stator winding branch circuit includes the step of turning off a switch circuit that is connected in parallel to the stator winding of an adjacent m segment, where m is 2 or greater.

[0042] The step of determining the target stator winding based on the rotor's movement position is as follows: Currently, when the rotor is located on n segments of the stator winding, the process includes determining the n+m segments of the stator winding in the direction of movement of the rotor as the target stator winding.

[0043] The step of turning off the switch circuit connected in parallel to the target stator winding is: The process includes the step of turning off the switch circuit connected in parallel to the n+m segment stator winding and turning on the switch circuit connected in parallel to the n segment stator winding when the end of the rotor separates from the n segment stator winding.

[0044] In this embodiment, at least two stator winding segments are powered simultaneously, and an m-segment type series connection switching countermeasure is employed. Under normal driving conditions, adjacent stator windings of the m-segment are powered simultaneously in the stator winding branching circuit. When the end of the rotor separates from the n-segment stator winding during the stator winding switching state, the switch circuit connected in parallel to the n+m segment stator winding is turned off, and the switch circuit connected in parallel to the n-segment stator winding is turned on. The switch circuits connected in parallel to the stator windings from n+1 to n+m-1 remain off.

[0045] For example, if m is 2, that is, a 2-segment series connection switching countermeasure is employed, and in a normal driving state, adjacent stator windings of 2 segments in the stator winding branch circuit are powered simultaneously, that is, in a normal driving state, when the rotor is located on the n-segment stator winding, the switch circuits connected in parallel to the n-segment stator winding and the n-segment + 1 stator winding are turned off, the n-segment stator winding and the n-segment + 1 stator winding are powered simultaneously, and the other stator windings are short-circuited by the switch circuits connected in parallel. In the stator winding switching state, when the end of the rotor moves away from the n-segment stator winding, the switch circuit connected in parallel to the n-segment + 2 stator winding is turned off, and the switch circuit connected in parallel to the n-segment stator winding is turned on. The switch circuit connected in parallel to the n-segment + 1 stator winding remains off.

[0046] Taking one of the stator winding branch circuits as an example, as shown in Figures 3 and 4, when the rotor is positioned on the first segment of the stator winding, the switch circuits connected in parallel to the first segment and the second segment of the stator winding are turned off, the first and second segment stator windings are powered simultaneously, and the other stator windings are short-circuited by the switch circuits connected in parallel. When the end of the rotor moves away from the first segment of the stator winding, the switch circuit connected in parallel to the third segment of the stator winding is turned off, and the switch circuit connected in parallel to the first segment of the stator winding is turned on. The switch circuit connected in parallel to the second segment of the stator winding remains off. The second and third segment stator windings are powered simultaneously. When the end of the rotor moves away from the second segment of the stator winding, the switch circuit connected in parallel to the fourth segment of the stator winding is turned off, and the switch circuit connected in parallel to the second segment of the stator winding is turned on. The switch circuit connected in parallel to the third segment stator winding remains off. The third segment stator winding and the fourth segment stator winding are powered simultaneously. When the end of the rotor separates from the third segment stator winding, the switch circuit connected in parallel to the fifth segment stator winding is turned off, and the switch circuit connected in parallel to the third segment stator winding is turned on. The switch circuit connected in parallel to the fourth segment stator winding remains off. The fourth segment stator winding and the fifth segment stator winding are powered simultaneously.

[0047] As shown in Figure 5, since the stator winding is an energy storage element, when the switch circuit connected in parallel to the stator winding is turned on, the stator winding and the switch circuit connected in parallel to it form a transient closed circuit, a discharge process occurs, causing fluctuations in the stator winding circuit and fluctuations in the motor's traction force. Also, as shown in Figure 6, when switching the stator winding, the switch circuit changes from on to off, and the motor's resistance changes from zero resistance (or small resistance) in the switch circuit to a large resistance in the stator winding. In this process, the rise time of the current is long, and fluctuations occur. To reduce fluctuations in the stator winding current, the length of the stator winding is shortened and a multi-segment series connection switching countermeasure is adopted.

[0048] For example, the length of the stator windings is shortened, and a 4-segment series connection switching countermeasure is adopted. In a normal running state, the stator winding branch circuit supplies power to four adjacent stator windings simultaneously. That is, in a normal running state, when the rotor is positioned on the n-segment stator winding, the switch circuits connected in parallel to the n-segment stator winding, the n-segment + 1 stator winding, the n-segment + 2 stator winding, and the n-segment + 3 stator winding are turned off, the n-segment stator winding, the n-segment + 1 stator winding, the n-segment + 2 stator winding, and the n-segment + 3 stator winding are supplied power simultaneously, and the other stator windings are short-circuited by the switch circuits connected in parallel. In the stator winding switching state, when the end of the rotor moves away from the n-segment stator winding, the switch circuit connected in parallel to the n-segment + 4 stator winding is turned off, and the switch circuit connected in parallel to the n-segment stator winding is turned on. The switch circuits connected in parallel to the n-segment+1 stator winding, the n-segment+2 stator winding, and the n-segment+3 stator winding remain in the off position.

[0049] Taking one of the stator winding branch circuits as an example, as shown in Figures 7 and 8, when the rotor is positioned on the first segment stator winding, the switch circuit connected in parallel to the first segment stator winding to the fourth segment stator winding is turned off, the first segment stator winding to the fourth segment stator winding are powered simultaneously, and the other stator windings are short-circuited by the parallel-connected switch circuits. When the end of the rotor moves away from the first segment stator winding, the switch circuit connected in parallel to the fifth segment stator winding is turned off, and the switch circuit connected in parallel to the first segment stator winding is turned on. The switch circuits connected in parallel to the second segment stator winding to the fourth segment stator winding remain off. The second segment stator winding to the fifth segment stator winding are powered simultaneously. When the end of the rotor separates from the stator winding of the second segment, the switch circuit connected in parallel to the stator winding of the sixth segment is turned off, and the switch circuit connected in parallel to the stator winding of the second segment is turned on. The switch circuits connected in parallel to the stator windings of the third segment to the stator windings of the fifth segment remain off. The stator windings of the third segment to the stator windings of the sixth segment are powered simultaneously. When the end of the rotor separates from the stator winding of the third segment, the switch circuit connected in parallel to the stator winding of the seventh segment is turned off, and the switch circuit connected in parallel to the stator winding of the third segment is turned on. The switch circuits connected in parallel to the stator windings of the fourth segment to the stator windings of the seventh segment remain off. The stator windings of the fourth segment to the stator windings of the seventh segment are powered simultaneously. When the end of the rotor separates from the stator winding of the fourth segment, the switch circuit connected in parallel to the stator winding of the eighth segment is turned off, and the switch circuit connected in parallel to the stator winding of the fourth segment is turned on. The switch circuits connected in parallel to the stator windings of the fifth segment through the eighth segment remain off. The stator windings of the fifth segment through the eighth segment are powered simultaneously.

[0050] In the alternating power supply method for a long-stator linear motor provided in this application, the stator windings can be controlled to either be energized or de-energized by controlling a switch circuit to be on or off, thereby improving the speed of switching and supplying power to the stator windings. By achieving static switching, the amount of converter used and the complexity of the system are effectively reduced, and wiring costs are lowered. Furthermore, by turning off the switch circuits connected in parallel to multiple adjacent stator windings, simultaneous power supply to multiple segments of the stator windings can be achieved. In addition, by shortening the length of the stator windings and increasing the number of segments of the stator windings, and by adopting a multi-segment series connection switching method, fluctuations in the motor's traction force during the stator winding switching power supply process can be reduced.

[0051] This application further provides a long-stator linear motor, which includes the alternating power supply circuit of the long-stator linear motor described in the above embodiments. Regarding the long-stator linear motor, no further explanation is given in this application; please refer to the above embodiments of the alternating power supply circuit.

[0052] Each embodiment should be described in a progressive manner in the specification, with each embodiment primarily explaining the differences from the other embodiments, and similar or identical parts between embodiments should be referenced to one another.

[0053] As will be apparent to those skilled in the art, each exemplary unit and algorithmic step described in combination with the embodiments disclosed herein is implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability between hardware and software, the configurations and steps of each example are generally described in the above description according to their function. Whether these functions are performed in hardware or software depends on the specific application of the technical solution and design constraints. Those skilled in the art may implement the functions described using different methods for each specific application, but such implementations are not beyond the scope of this application.

[0054] The steps of the methods or algorithms described in combination with the embodiments disclosed herein are carried out directly by hardware, a software module executed by a processor, or a combination of both. The software module may be located in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable and programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the art.

[0055] The above describes in detail the alternating power supply circuit, alternating power supply method, and long-stator linear motor provided in this application. The principles and embodiments of this application are described herein using specific examples, and the above description of embodiments is used solely for understanding the methods and the main concept of this application. Hereinafter, those skilled in the art may make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. This is an alternating power supply circuit for a long-stator linear motor, A long-stator linear motor alternating power supply circuit, characterized in that it includes a three-phase stator winding branch circuit, each phase of the stator winding branch circuit is connected to a converter, each phase of the stator winding branch circuit includes N-segment stator windings connected in series, a switch circuit is connected in parallel to each segment of the stator winding, and when the switch circuit is turned on, it short-circuits the stator windings connected in parallel.

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

3. The alternating power supply circuit for a long stator linear motor according to claim 1, characterized in that the tip of each phase's stator winding branch circuit is connected to a converter, and the end of each phase's stator winding branch circuit is connected in a star configuration.

4. The alternating power supply circuit for a long stator linear motor according to claim 1, characterized in that the length of the stator windings in each segment of the stator winding branching circuit is equal.

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

6. A method for alternate power supply of a long-stator linear motor, applicable to the alternate power supply circuit of a long-stator linear motor described in any one of claims 1 to 5. In a stator winding branch circuit, the step of turning off a switch circuit connected in parallel to the stator winding of an m-segment, thereby supplying power to the stator winding of the m-segment, A step of monitoring the rotor's movement position, The steps include determining a target stator winding based on the rotor's movement position, A method for alternately supplying power to a long stator linear motor, characterized by comprising the step of turning off a switch circuit connected in parallel to the target stator winding based on the moving position of the rotor.

7. In the stator winding branch circuit, the step of turning off the switch circuit connected in parallel to the m-segment stator winding is: The alternating power supply method for a long stator linear motor according to claim 6, comprising the step of turning off a switch circuit connected in parallel to the stator winding of an adjacent m segment in the stator winding branch circuit, wherein m is 2 or more.

8. The step of determining the target stator winding based on the rotor's movement position is as follows: The alternating power supply method according to claim 7, characterized in that, when the rotor is currently located on the n-segment stator winding, the stator winding of n+m segments in the direction of movement of the rotor is determined to be the target stator winding.

9. The step of turning off the switch circuit connected in parallel to the target stator winding based on the rotor's movement position is: The alternating power supply method according to claim 8, characterized in that when the end of the rotor separates from the n-segment stator winding, the switch circuit connected in parallel to the n+m-segment stator winding is turned off and the switch circuit connected in parallel to the n-segment stator winding is turned on.

10. A long-stator linear motor, characterized in that it includes an alternating power supply circuit for the long-stator linear motor according to any one of claims 1 to 5.

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