CN114759758A - Long-stator linear motor stator segment parallel power supply connection circuit and switch switching method thereof - Google Patents

Abstract

The invention provides a parallel power supply connection circuit for stator segments of a long stator linear motor and a switch switching method thereof. The motor stator segment is connected to a converter through a switch composed of bidirectional thyristors. The neutral points of the stator segments are connected; when the motor mover leaves a certain stator segment, a shutdown signal is sent to the triacs of each phase connected to the stator segment, and according to the sequence of the zero-crossing shutdown of each phase current, at the same time Turn on each phase switch of the same phase connected to the next stator segment in turn; when one converter supplies power to multiple motor stator segments or multiple converters supply power to different motor stator segments, the circuit and switching method Both have the advantages that the output current of the converter and the current fed into the cable are stable without sudden change during the power supply switching process of the stator section, the current is stable without distortion when the switch of the stator section is turned off, and the current has no impact when the switch of the stator section is closed.

Description

A long-stator linear motor stator segment parallel power supply connection circuit and switching method thereof

technical field

The invention belongs to the field of motors, in particular to a parallel power supply connection circuit of stator segments of a long stator linear motor and a switch switching method thereof.

Background technique

Compared with rotary motors, linear motors have the advantages of simple structure, fast response and good tracking effect, and can be widely used in the field of linear drives, such as maglev trains, electromagnetic propulsion acceleration systems, high-speed vehicle crash test systems, aerospace and other high-speed transportation. System components, ground test system, etc. Generally, linear motors are divided into two types: long armature linear motors and short armature linear motors. The representative application of short armature linear motors is medium and low speed maglev trains. The DC power on the ground is transmitted to the vehicle through the pantograph or the third rail, and the voltage and current After the frequency is converted, it supplies power to the on-board armature and drives the train to run. The typical application of the long armature linear motor is the high-speed maglev train system, such as the German TR series maglev train, the Japanese superconducting maglev train, etc. The long armature stator is arranged on the ground track, and the AC output from the ground converter is fed through the switch. Armature winding, the total length of the ground armature is the length of the train line track. The long stator armature linear motor mover (arranged at the lower part of the train) is much shorter than the stator armature fixed on the track. If all the stators are energized, the proportion of the effective area is very small, the efficiency is very low, the power factor is very small, and the power supply The converter has high capacity requirements and is expensive to manufacture. The long stator of the motor with armature is usually segmented in application, and each segment is called a stator segment. The AC output from the ground converter is fed through the feeder cable, the switch, and then into the stator section. The stator segment near the motor mover is powered, and the rest of the stator segment is not powered, and the power is switched to the corresponding stator segment according to the movement process of the motor mover. This can effectively improve system efficiency and reduce individual converter voltage and current levels.

At present, the commonly used power supply methods for the stator segment of a linear motor include a series power supply method and a parallel power supply method. The series power supply method is that the armature windings of multiple stator segments arranged along the line are connected in series through switches and the intermediate busbar, and then connected to the power supply converter; when the drive motor mover is running, the switches connecting the stator segments are controlled to be closed or closed in sequence. When disconnected, the converter supplies power to the sequentially arranged stator segments in an alternating switching manner. Each time the switch is performed, the stator segment where the motor mover leaves is powered off, the stator segment where the motor mover is located, or the stator segment where the motor mover is about to enter is energized. This kind of power supply mode in which the stator sections are connected in series requires that the voltage level of the converter system is very high, the withstand voltage level of the motor stator armature windings connected in series, the withstand voltage level of the switch, and the withstand voltage level of the feeder cable are all high. , The number of feeder cables and switches used is large. When a stator segment or a group of switches connected in series fails, a series of stator segments must quit work, and the fault tolerance is poor. The paper "A segmented power supply strategy for linear motors considering current zero-crossing" (Zhang Mingyuan [J] Journal of Naval Engineering University, 2019, 31(04): 11-16) applies segmented series-powered linear motors to fast electromagnetic drives in the system. Chinese invention patent CN110912493 A "Segmented Power Supply System for Induction Linear Motor" proposes an improved series power supply connection method, which reduces the number of switching switches by increasing the power supply busbar.

The parallel power supply method is that the armature windings of several linear motor stator segments arranged along the line are directly connected to the output end of the converter through switches, and the sequentially arranged linear motor stator segments are supplied with power in an alternating manner. In the parallel power supply mode, the voltage level of a single converter is low. Even if one stator segment fails to switch, the remaining stator segments can still operate normally, with high fault tolerance. Compared with series power supply, this power supply method has greater advantages in high-power, high-speed electromagnetic drive occasions.

In the usual parallel power supply mode, the neutral point of the stator winding is independent, and the switch is usually composed of high-voltage, high-current thyristors. The parallel power supply can adopt the zero-crossing shutdown strategy. However, when the current of one phase crosses zero and the phase is disconnected, the circuit changes, the waveform of the current of the other phases changes, and the current is distorted. When at least two phases are turned on, there is only current in the circuit loop. It is impossible to turn on a single-phase circuit alone, the current overshoot increases, and the current harmonics increase. It is difficult to independently control the opening time of each phase circuit to reduce current overshoot and reduce A large number of harmonics are generated during switching. At the same time, the requirements for the output voltage of the converter and the allowable current of the motor winding are relatively high, and the system cost is relatively high.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a long stator linear motor stator segment parallel power supply connection circuit and its switch switching method, so as to solve the problem that when the stator segment parallel power supply linear motor switches the switch connected to the stator segment, every time the switch of the upper stator segment is turned off. The current is distorted, the current has an impact in the process of closing the switch of the next stator segment, and the current is interrupted during the switching of the stator segment and the power supply process.

To achieve the above object, the present invention adopts the following scheme:

A parallel power supply connection circuit for stator segments of a long stator linear motor, which includes a converter, a linear motor stator segment, a linear motor mover, a feed-in cable, a switch and a connection cable, and divides the long stator linear motor stator armature into a plurality of Linear motor stator segment, each linear motor stator segment is connected to a set of switching switches, and then connected to the output terminal of the converter that supplies power to the linear motor stator segment through the feed-in cable; when the linear motor stator segment is powered and running, the linear motor mover The switch of the linear motor stator segment where the linear motor stator segment is located and the linear motor stator segment where the linear motor mover is about to enter is closed, and the converter supplies power to these linear motor stator segments; The switch of the linear motor stator segment is turned off, and the converter does not supply power to these linear motor stator segments; when the linear motor mover length is less than or equal to the length of one linear motor stator segment, at least two adjacent linear motor stator segments simultaneously Power supply; when the length of the linear motor mover is greater than one linear motor stator segment, and less than or equal to two linear motor stator segments, at least three consecutive linear motor stator segments are powered at the same time; when the linear motor mover length is greater than two linear motor stator segments When the stator segment is less than or equal to the three-segment linear motor stator segment, at least four consecutive linear motor stator segments are powered at the same time, and so on.

Further, the long stator linear motor is a long stator armature linear asynchronous motor or a long stator armature linear synchronous motor.

Further, the long stator linear motor is a motor with a unilateral structure or a motor with a bilateral structure.

Further, the stator segments of the linear motors that supply power at the same time are connected to the same converter output end, or multiple linear motor stator segments that supply power simultaneously are connected to the output ends of two or more different converters.

Further, the neutral points of the stator segments that are powered by the same converter and are energized and de-energized in sequence are connected, and the linear motor stator segments are sequentially numbered along the running direction, that is, the situation where two adjacent linear motor stator segments are powered at the same time. , connect the neutral points of the stator segments 1#, 3#, 5#...(2m1+1)# connected to the same converter in parallel, and connect the 2#, 5#, etc. connected to the same converter in parallel. 4#, 6#...(2m1+2)# The neutral points of the stator segments are connected together; if three consecutive stator segments are powered at the same time, the 1#, 4#, 7 of the same converter will be connected in parallel #...(3m1+1)# The neutral points of the stator segments are connected together, and the 2#, 5#, 8#...(3m1+2)# which are connected in parallel to the same converter are connected to the neutral point of the stator segment. The 3#, 6#, 9#...(3m1+3)# stator segments connected in parallel to the same converter are connected to the neutral point; if the four consecutive stator segments are powered at the same time, Connect the neutral points of stator segments 1#, 5#, 9#...(4m1+1)# connected to the same converter in parallel, and connect 2#, 6 of the same converter in parallel #, 10#...(4m1+2)# Connect the neutral points of the stator segments together, connect the neutral points of the 3#, 7#, 11#...(4m1+3)# stator segments, and connect them in parallel The neutral points of 4#, 8#, 12#...(4m1+4)# connected to the same converter are connected together, and so on, m1 is a natural number.

The present invention also provides a switching method for the parallel power supply connection circuit of the stator segments of the long stator linear motor, which determines the linear motor stator segment to be powered according to the position of the linear motor mover. During the movement of the linear motor mover, the converter When alternately supplying power to the linear motor stator segment, when the linear motor mover leaves a linear motor stator segment, a shutdown signal is sent to each phase triac connected to the linear motor stator segment, and it is turned off according to the zero-crossing of each phase current. , and turn on each phase switch connected to the next linear motor stator segment in turn to complete the switching.

The beneficial effects of the present invention are as follows: the present invention proposes a circuit in which the neutral points of the linear motor stator segments connected in parallel under the same converter power supply line are connected in parallel, and the upper stator segment current is turned off at zero-crossing and turned on at the same time. The switching method of the next stator sub-section reduces the problems of current distortion in the process of turning off the upper stator sub-section, current impact in the process of opening the next stator sub-section, and current discontinuity in the whole switching process.

Description of drawings

Fig. 1 is the drive structure diagram of segmented power supply bilateral linear motor of the present invention;

FIG. 2 is a schematic diagram of a single converter of the present invention connecting two adjacent linear motor stator segments in parallel for power supply;

3 is a schematic diagram of a parallel connection circuit for supplying power to two adjacent linear motor stator segments for two converters of the present invention;

FIG. 4 is a schematic diagram of a single converter of the present invention connecting three adjacent linear motor stator segments in parallel for power supply;

5 is a schematic diagram of a parallel connection circuit for supplying power to three adjacent linear motor stator segments for three converters of the present invention;

FIG. 6 is a schematic diagram of a parallel connection circuit for the parallel connection of two adjacent stator segments of a dual-phase linear motor for two converters of the present invention;

7 is a schematic diagram of the current waveform of a single stator segment of the present invention;

FIG. 8 is a current waveform diagram of the current transformer in the whole process of the present invention.

In the figure, 1 converter 1#, 2 converter 2#, 3 converter 3#, 10 converter 1# output cable, 11 converter 2# output cable, 20, 21, 22, 23, 24, 25...m linear motor stator segments 1#, 2#, 3#, 4#, 5#, 6#...m1#, 100 linear motor movers, 30, 31, 32, 33, 34, 35...n1 feed cables in sequence, 40, 41, 42, 43, 44, 45...n2 switches in sequence, 50, 51, 52, 53, 54, 55...n3 press Connecting cables arranged in sequence, 60 midpoint of stator segment connecting cable 1, 60' midpoint connecting cable 2, 61 midpoint connecting cable 61' stator segment connecting cable 3, 61' midpoint connecting cable 4, 62 stator The midpoint of the segment is connected to the cable 5, and m, m1, n1, n2, and n3 are natural numbers.

Detailed ways

The present invention is further described below with reference to the accompanying drawings and specific embodiments, and the examples are only used to explain the present invention, and do not limit the scope of the present invention.

As shown in Figure 1, the segmented power supply bilateral linear motor drive structure diagram. Taking the length of the linear motor mover 100 less than one stator segment as an example, since the linear motor mover 100 is coupled with two stator segments at the same time, it is necessary to energize the two segments of the stator at the same time to make the distance between the linear motor stator segment and the linear motor mover 100 The coupled magnetic field remains constant. It includes converter 1#1, converter 2#2, linear motor stator segments 1#, 2#, 3#, 4#, 5#, 6#... m1#20, 21, 22 arranged in sequence , 23...m, linear motor mover 100, feed cables 30, 31, 32, 33...n1 in sequence, diverter switches 40, 41, 42, 43...n2 in sequence and in sequence The connecting cables 50, 51, 52, 53...n3. Divide the long stator linear motor stator armature into multiple linear motor stator segments 20, 21, 22, 23... . The output cable 11 of the converter 2# is connected to the output end of the converter that supplies power to the stator segment of the linear motor, where m represents the m1# of the stator segment of the linear motor. Preferably, the stator segments that supply power at the same time can be connected to the same converter output end, or multiple stator segments that supply power simultaneously can be connected to the output ends of two or more different converters. When the power supply is running, close the switch of the stator segment where the linear motor mover is located and the stator segment where the linear motor mover is about to enter, and the converter supplies power to these stator segments; The diverter switches of the stator segments are open, and the converter does not supply power to these stator segments. The number of power supply stator segments is determined according to the length relationship between the linear motor mover and the length of a single stator segment. When the length of the linear motor mover is less than or equal to the length of one stator segment, at least two adjacent stator segments supply power at the same time; when the linear motor mover length is greater than one stator segment, less than or equal to two stator segments, at least three consecutive stator segments The stator segments are powered at the same time; when the length of the linear motor mover is greater than the second stator segment and less than or equal to the three stator segments, at least four consecutive stator segments are powered at the same time, and so on.

The stator segment to be powered is determined according to the position of the linear motor mover. During the movement of the linear motor mover, when the converter alternately supplies power to the stator segments, when the linear motor mover leaves a certain stator segment, it sends a shutdown signal to The triacs of each phase connected to the stator segment turn on the switches of each phase connected to the next stator segment in turn according to the sequence of the current zero-crossing turn-off of each phase to complete the switching.

It should be noted that the relationship between the length of the linear motor mover and the length of the linear motor stator segment can be determined according to the output voltage, current, frequency and running speed of the motor mover of the linear motor system converter.

It should be understood that when multiple converters are powered in parallel, the number of required multiple converters is optional. For example, the length of the linear motor mover is greater than the length of one stator segment and less than the length of two stator segments, and the number of stator segments is three. Three converters can be selected to supply power to three stator segments at the same time, or four converters can be selected to supply power to four stator segments at the same time. The selection is made according to actual needs. The neutral point connection between the stator segments remains unchanged.

Optionally, the parallel power supply connection circuit of the stator segments of the long stator linear motor adopts a single converter to supply power, and the stator segments are all connected to one converter through a switch. When supplying power to two adjacent stator segments at the same time, connect the neutral points of 1#, 3#, 5#...(2m1+1)# stator segments together through the midpoint connecting cable, and connect 2#, 4#, 6 #...(2m1+2)# The neutral points of the stator segments are connected together through the midpoint connecting cable; when three consecutive stator segments are powered at the same time, connect 1#, 4#, 7#...(3m1+1 )#The neutral points of the stator segment are connected together through the midpoint connecting cable, and 2#, 5#, 8#...(3m1+2)# The neutral points of the stator segment are connected together through the midpoint connecting cable, and the 3 #, 6#, 9#...(3m1+3)# The neutral point of the stator segment is connected by the midpoint connecting cable; when four consecutive stator segments are powered at the same time, connect 1#, 5#, 9#... (4m1+1)#The neutral points of the stator segments are connected together through the midpoint connection cable, and the 2#, 6#, 10#...(4m1+2)# stator segment neutral points are connected through the midpoint connection cable on the Together, connect 3#, 7#, 11#...(4m1+3)# to the neutral point of the stator segment through the midpoint connecting cable, and connect 4#, 8#, 12#...(4m1+4)# The neutral points of the stator segments are connected together by the neutral point connecting cable, m1 is a natural number, and so on.

Optionally, the parallel power supply connection circuit of the long stator linear motor stator segments is powered by multiple converters. 5#...(2m1+1)# stator segments are all connected to converter 1# through their respective switches, and the 1#, 3#, 5#...(2m1+1)# stators are connected to each other. The neutral points of the segments are connected together through the neutral point connecting cable, and the 2#, 4#, 6#...(2m1+2)# stator segments are all connected to the converter 2# through their respective switches, and all the The neutral points of the 2#, 4#, 6#...(2m1+2)# stator segments are connected together by the neutral point connecting cable; when three consecutive stator segments are powered at the same time, three converters are used for power supply , connect the 1#, 4#, 7#...(3m1+1)# stator segments to the converter 1#1 through their respective switches, and connect the 1#, 4#, 7#· ··(3m1+1)# The neutral points of the stator segments are connected together through the midpoint connecting cable, and the 2#, 5#, 8#...(3m1+2)# stator segments are all connected to each other through their respective switches. converter 2#2, and connect the neutral points of the 2#, 5#, 8#...(3m1+2)# stator segments together through the midpoint connecting cable, and connect the 3#, 6#, 9#...(3m1+3)# stator segments are all connected to converter 3# through their respective switches, and the 3#, 6#, 9#...(3m1+3)# stators are connected The neutral point of the segment is connected by the neutral point connecting cable; when four consecutive stator segments are powered at the same time, four converters are used to supply power, and the 1#, 5#, 9#...(4m1+1)# stator segments are passed through The respective switches are all connected to the converter 1#, and the neutral points of the 1#, 5#, 9#...(4m1+1)# stator segments are connected together through the neutral point connecting cable, and the 2#, 6#, 10#...(4m1+2)# The stator segments are all connected to the converter 2# through their respective switches, and the 2#, 6#, 10#...( 4m1+2)# The neutral points of the stator segments are connected together through the neutral point connecting cable, and the 3#, 7#, 11#...(4m1+3)# stator segments are all connected to the converter through their respective switches. 3#, and connect the neutral point of the 3#, 7#, 11#...(4m1+3)# stator segment through the midpoint connecting cable, and connect the 4#, 8#, 12#...( 4m1+4)# stator segments are all connected to converter 4# through their respective switches, and the neutral points of the 4#, 8#, 12#...(4m1+4)# stator segments are passed through the middle Dot connection cables are connected together, m1 is a natural number, and so on.

FIG. 2 is a schematic diagram of a single converter of the present invention supplying power to two adjacent linear motor stator segments in parallel. Said linear motor stator segments 20, 21, 22, 23...m are connected to respective diverter switches 40, 41, 42, 43...n2 through connecting cables 50, 51, 52, 53...n3, the diverter switches 40, 41, 42, 43...n2 are all connected to the output end of one converter 1#1 through feeding cables 30, 31, 32, 33...n1. In the case where two adjacent linear motor stator segments are powered at the same time, connect the neutral points of the 1#, 3#, 5#...(2m1+1)# stator segments through the mid-point connecting cable 160 of the stator segment to connect the 2#, 4#, 6#...(2m1+2)# The neutral point of the stator segment is connected together through the midpoint connecting cable 361 of the stator segment, and m, m1, n1, and n2 are natural numbers.

FIG. 3 is a schematic diagram of the connection circuit of the parallel connection of two inverters to the stator segments of two adjacent linear motors in accordance with the present invention. For a multi-converter power supply system, when two adjacent stator segments are powered at the same time, two inverters 1 are used. #1 and converter 2#2 supply power, connect 1#, 3#, 5#...(2m1+1)# stator segments to their respective switches through connecting cables 50, 52,...(n3-1) Switches 40, 42, ... (n2-1), diverters 40, 42, ... (n2-1) are all connected to converter 1#1 through feed cables 30, 32, ... (n1-1) , and connect the neutral points of the stator segments 1#, 3#, 5#...(2m1+1)# through the midpoint connecting cable 160 of the stator segment; connect 2#, 4#, 6# ...(2m1+2)# stator segments are connected to respective diverter switches 41, 43,...n2 via connecting cables 51, 53,...n3, which are connected via feed-in cables 31, 43,...n2 33....n1 are all connected to the converter #2 2, and the neutral point of the 2#, 4#, 6#...(2m1+2)# stator segment is connected to the cable through the midpoint of the stator segment 3 61 are connected together, and m1, n1, n2, and n3 are natural numbers.

FIG. 4 is a schematic diagram of a single converter of the present invention supplying power to three adjacent linear motor stator segments in parallel. Said linear motor stator segments 20, 21, 22, 23...m are connected to respective diverter switches 40, 41, 42, 43...n2 through connecting cables 50, 51, 52, 53...n3, the diverter switches 40, 41, 42, 43...n2 are all connected to the output end of one converter 1#1 through feeding cables 30, 31, 32, 33...n1. In case of supplying power to three consecutive stator segments at the same time, connect the neutral point of 1#, 4#, 7#...(3m1+1)# stator segment through the midpoint connecting cable 160 of the stator segment, and connect 2# , 5#, 8#...(3m1+2)# The neutral point of the stator segment is connected together through the midpoint connecting cable 361 of the stator segment, and 3#, 6#, 9#...(3m1+3 )# The neutral point of the stator segment is connected through the midpoint connecting cable 562 of the stator segment, m, m1, n1, n2 are natural numbers, and so on.

FIG. 5 is a schematic diagram of a parallel connection circuit for supplying power to three adjacent linear motor stator segments for three converters of the present invention. Three consecutive stator segments are powered at the same time. When three converters are used for power supply, connect 1#, 4#, 7#...(3m1+1)# stator segments through connecting cables 50, 53,...n3-2 connected to the respective diverter switches 40, 43, . . . (n2-2), the diverters 40, 43, . 1#1, and connect the neutral points of the 1#, 4#, 7#...(3m1+1)# stator segments together through the midpoint connecting cable 160 of the stator segment; connect 2# , 5#, 8#...(3m1+2)# stator segments are connected to their respective changeover switches 41, 44,...(n2-1) through connecting cables 51, 54,...(n3-1), switching The switches 41, 44, ... (n2-1) are all connected to the converter 2#2 through the feed cables 31, 34, ... (n1-1), and the 2#, 5#, 8# ...(3m1+2)#The neutral point of the stator segment is connected together through the midpoint connecting cable 361 of the stator segment; connect 3#, 6#, 9#...(3m1+3)# stator segment by connecting The cables 52, 55, ... n3 are connected to the respective diverters 42, 45, ... n2, and the diverters 42, 45, ... n25 are all connected to the converter 3# through the feed cables 32, 35, ... n1 , and connect the neutral point of the 3#, 6#, 9#...(3m1+3)# stator segment through the midpoint connecting cable 562 of the stator segment, m, m1, n1, n2, n3 is a natural number.

Optionally, in some embodiments, the linear motor may be a multi-phase motor, such as a dual-phase motor, the neutral point connection circuit is shown in FIG. Inverter 1# is 1#, 3#, 5#...(2m1+1)# stator segment 20, 22, 24...(m-1) power supply, connect 1#, 3# , 5#...(2m1+1)# The double neutral points of stator segments 20, 22, 24...(m-1) are connected through the midpoint connecting cables 1, 2, 60, 60' of the stator segment respectively; 2# converter 2 supplies power to 2#, 4#, 6#...(2m1+2)# stator segments 21, 23, 25...m, and 2#, 4#, 6#...(2m1 +2)# The double neutral points of the stator segments 21, 23, 25...m are respectively connected through the midpoint connecting cables 3, 461, 61' of the stator segments, and m and m1 are natural numbers.

Optionally, in some embodiments, the linear motor may be a long stator armature linear asynchronous motor, a long stator armature linear synchronous motor, or other forms of long stator armature linear motors. The long stator linear motor can be a motor in the form of a unilateral structure or a motor in the form of a bilateral structure.

Figure 7 shows the current waveform of a single stator segment. For the current of a single stator segment, when turned on, each phase is turned on in sequence according to the current phase sequence, and the current has no impact; when turned off, each phase is turned off in sequence according to the current phase sequence, and the current has no current. distortion.

Fig. 8 is the whole current waveform diagram of the converter. For the full current of the converter, the current during the switching process is continuous, the current has no impact, and does not affect the current change trend. The linear motor stator segment parallel power supply connection circuit ensures that the segmented stator segment switching in the segmented parallel power supply system of the long stator linear motor does not affect the current of the converter; for motor control, the current is continuous, making motor control simpler.

Although illustrative specific embodiments of the present invention have been described above to facilitate understanding of the present invention by those skilled in the art, it should be clear that the present invention is not limited in scope to the specific embodiments. As long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the inventive concept are included in the protection list.

Claims (6)

1. A parallel power supply connection circuit for the stator segments of a long stator linear motor, which includes a converter, a linear motor stator segment, a linear motor mover, a feed-in cable, a switch and a connection cable, and divides the long stator linear motor stator armature into two parts. Multiple linear motor stator segments, each linear motor stator segment is connected to a set of switching switches, and then connected to the output end of the converter that supplies power to the linear motor stator segment through the feed-in cable; when the linear motor stator segment is powered and running, the linear motor The switch of the linear motor stator segment where the manipulator is located and the linear motor stator segment where the linear motor mover is about to enter is closed, and the converter supplies power to these linear motor stator segments; The switch of the incoming linear motor stator segment is off, and the converter does not supply power to these linear motor stator segments; It is characterized in that, when the length of the linear motor mover is less than or equal to the length of one linear motor stator segment, at least two adjacent linear motor stator segments supply power at the same time; when the linear motor mover length is greater than a linear motor stator segment, less than or equal to When there are two linear motor stator segments, at least three consecutive linear motor stator segments are powered at the same time; when the linear motor mover length is greater than the two linear motor stator segments, and less than or equal to the three linear motor stator segments, at least four consecutive linear motor stator segments are used. The linear motor stator segments are powered simultaneously, and so on. 2 . The long stator linear motor stator segment parallel power supply connection circuit according to claim 1 , wherein the long stator linear motor is a long stator armature linear asynchronous motor or a long stator armature linear synchronous motor. 3 . 3 . The parallel power supply connection circuit for stator segments of a long stator linear motor according to claim 1 , wherein the long stator linear motor is a motor with a single-sided structure or a motor with a double-sided structure. 4 . 4. The long-stator linear motor stator segment parallel power supply connection circuit according to claim 1 is characterized in that: the linear motor stator segments powered simultaneously or alternately are connected to the same converter output end, or the Multiple linear motor stator segments are connected to two or more different converter outputs. 5. The long stator linear motor stator segment parallel power supply connection circuit according to claim 1 is characterized in that: the neutral points of the stator segments that are powered by the same converter and are energized and de-energized in sequence are connected, that is, adjacent to each other. In the case where two linear motor stator segments are powered at the same time, connect the neutral points of the 1#, 3#, 5#...(2m1+1)# stator segments connected in parallel to the same converter together, and connect them in parallel. The neutral points of 2#, 4#, 6#...(2m1+2)# stator segments of the same converter are connected together; if three consecutive stator segments are powered at the same time, they will be connected to the same converter in parallel 1#, 4#, 7#...(3m1+1)# neutral points of stator segments are connected together, and 2#, 5#, 8#...( 3m1+2)# The neutral points of the stator segments are connected together, and the neutral points of the 3#, 6#, 9#...(3m1+3)# stator segments connected in parallel to the same converter are connected together; In the case of simultaneous power supply of four consecutive stator segments, connect the neutral points of the 1#, 5#, 9#...(4m1+1)# stator segments connected in parallel to the same converter together, and connect them in parallel. The neutral points of 2#, 6#, 10#...(4m1+2)# of the same converter are connected together, and the 3#, 7#, 11# of the same converter will be connected in parallel ...(4m1+3)#The neutral points of the stator segments are connected together, and the 4#, 8#, 12# of the same converter will be connected in parallel...(4m1+4)#The neutral points of the stator segments Connected together, and so on, m1 is a natural number. 6. The switching method of the long stator linear motor stator segment parallel power supply connection circuit according to one of claims 1-5, characterized in that: the linear motor stator segment to be powered is determined according to the position of the linear motor mover, and the linear motor stator segment to be powered is determined according to the position of the linear motor mover. During the movement of the motor, when the converter alternately supplies power to the linear motor stator segment, when the linear motor mover leaves a certain linear motor stator segment, a shutdown signal is sent to each phase bidirectional thyristor connected to the linear motor stator segment. According to the sequence of the current zero-crossing shutdown of each phase, the switches of each phase connected to the next linear motor stator segment are turned on at the same time to complete the switching.

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