CN112953121A - Stator power supply method for long-stator linear motor - Google Patents
Stator power supply method for long-stator linear motor Download PDFInfo
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- CN112953121A CN112953121A CN202110206253.4A CN202110206253A CN112953121A CN 112953121 A CN112953121 A CN 112953121A CN 202110206253 A CN202110206253 A CN 202110206253A CN 112953121 A CN112953121 A CN 112953121A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/0094—Structural association with other electrical or electronic devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
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Abstract
The invention relates to a long stator linear motor stator power supply method, which divides a multiphase long stator winding into subarea power supply sections electrically connected in series end to end along the running direction of a rotor, wherein the heads and the tails of the power supply sections are respectively provided with a multiphase controllable switch assembly which is respectively called a head switch and a tail switch of the section; according to the running state of the rotor, the controllable switch assembly is in a state of being connected with a power supply, connected with a neutral line or suspended to form different power supply loops, so that the segmented power supply of the linear motor stator is realized; when the rotor is in a power supply section k, one of a head switch and a tail switch of the power supply section k is set to be in a state of being connected with a power supply, and the other switch is set to be in a state of being connected with a neutral line; the crossing process of the mover from the power supply section k to the power supply section k +1 is completed based on the rules of "pre-on" and "delayed off". Compared with the prior art, the invention has the advantages of low equipment cost, stable driving force of the linear motor in the power supply switching process of the stator segment and the like.
Description
Technical Field
The invention belongs to the technical field of motors and control, and particularly relates to a stator power supply method of a long-stator linear motor.
Background
The linear motor is a novel motor capable of directly converting electric energy into linear motion mechanical energy, and has wide application prospects in the fields of rail transit, textile industry, heavy industry and the like. The long stator linear motor can be used as a core driving part of rail transit and has great significance for the development of the traffic field.
The power supply technology is the key in a long stator linear motor driving system, the power supply system provides power required by operation for the rotor, and the amplitude and the frequency of a power supply can be changed. Due to the adoption of the long stator structure, if all stator windings on a long track are unrealistic to be supplied with power at the same time, a large amount of energy is inevitably lost unnecessarily, and the efficiency of a motor driving system is greatly reduced, which is particularly embodied in a high-power motor driving system. In the long stator linear motor, only the stator section through which the mover passes is really involved in the electromechanical energy conversion, and the section is electrified to generate a traveling wave magnetic field to interact with an excitation magnetic field so as to provide driving force for the operation of the mover. Therefore, only the stator winding corresponding to the stator section where the rotor is located needs to be supplied with power, namely, the stator winding is supplied with power in a segmented mode.
The conventional stator winding sectional power supply method of the long-stator linear motor mainly comprises a two-step method and a three-step method. The two-step process requires two sets of feeder cables, each set supplying power to the stator section of the track on one fixed side. In the process of switching the stator segments, the loop switch of the stator segment to be separated from the rotor is turned off, the current is reduced to zero, and then the loop switch of the stator segment to be separated from the rotor is turned on, and the current is increased. During the step change, the driving force will have a certain pulsation and drop. The three-step rule needs three groups of feed cables to supply power to the stator sections on the two sides in turn, thereby avoiding the pulsation of the driving force of the rotor in the switching process of the stator sections in the two-step method, but the feed cables are more, and the power supply equipment is complicated.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a long stator linear motor stator power supply method, which realizes the sectional power supply of the long stator linear motor stator winding, has low equipment cost and can keep the driving force of the linear motor stable in the process of switching the power supply of the stator sections.
The purpose of the invention can be realized by the following technical scheme:
a long stator linear motor stator power supply method, this method divides the polyphase long stator winding into the subregion power supply section that the end electricity connects in series along the runner running direction, every power supply section sets up the polyphase controllable switch assembly end to end, call as the first switch and end switch of this section separately;
according to the running state of the rotor, the controllable switch assembly is in a state of being connected with a power supply, connected with a neutral line or suspended to form different power supply loops, so that the segmented power supply of the linear motor stator is realized;
under a normal running condition, when the rotor is in a power supply section k, one of a head switch and a tail switch of the power supply section k is set to be in a state of being connected with a power supply, and the other is set to be in a state of being connected with a neutral line;
the crossing process of the mover from the power supply section k to the power supply section k +1 is completed based on the rules of pre-on and delayed off,
the "pre-turn on" rule refers to: preparing for the rotor to cross from a power supply section k to a power supply section k +1, firstly switching the first switch state of the power supply section k +1 to be consistent with the first switch state of the power supply section k, and then switching the first switch of the power supply section k to be in a suspended state;
the "delayed turn-off" rule refers to: after the mover crosses from the power supply section k to the k +1 power supply section, the tail switch state of the power supply section k +1 is switched to be consistent with the tail switch state of the power supply section k, and then the tail switch of the power supply section k is switched to be in a floating state.
Furthermore, the multi-phase long stator winding adopts a power supply mode of Y-shaped connection and neutral line leading-out.
Further, one controllable switch assembly is shared between adjacent power supply sections.
Further, the split phase performs state switching control on the controllable switch component.
Preferably, the time of switching the state of the controllable switching assembly in each phase is selected such that the phase current or voltage is close to 0, thereby reducing switching losses.
Further, the lengths of the stator windings of the power supply sections are different in consideration of factors such as the running speed of the rotor.
Furthermore, the power supply can be carried out across sections by considering factors such as the running speed of the rotor, and the like, a group is formed by multiple sections of the power supply sections, and the controllable switch assembly is controlled by grouping the power supply sections to switch states.
Further, the number of power supply sections in each group is different by considering factors such as the operation speed of the rotor.
Further, the activation times for the "pre-on" and "delayed off" states are determined based on motor parameter factors and efficiency requirements.
Further, the motor parameter factors include the operation speed of the rotor, the length of the power supply section and the like.
The invention supplies power to the long stator in sections, greatly reduces the power loss of the power supply system, improves the power supply efficiency, and has safe and reliable power supply system. Compared with the prior art, the invention has the following advantages:
1) the multi-phase long stator winding is divided into the partitioned power supply sections electrically connected in series from head to tail along the running direction of the rotor, the controllable switch assembly is controlled according to the running state of the rotor, the segmented power supply of the long stator linear motor stator winding can be realized, and the driving force of the linear motor can be kept stable in the power supply switching process of the stator sections;
2) in the process of switching the power supply of the stator segments, the adjacent stator segments are used as passive buffer segments, the buffer segments are not coupled with the rotor and do not participate in electromechanical energy conversion, so that the current-carrying operation of a part of winding where the rotor is located is avoided through pre-connection and delayed cut-off, and the thrust fluctuation and the loss of the motor in the process of segment changing can be effectively reduced;
3) the introduction of the passive buffer section can further reduce the switching loss by combining zero current and zero voltage switching;
4) the equipment used by the invention only needs one group of feed cables and one group of long stator winding, the required equipment quantity is small, the cost is lower, and the power supply device has a simple structure and is easy to realize.
Drawings
Fig. 1 is a schematic structural view of a long stator linear motor system in embodiment 1;
FIG. 2 is a schematic view showing a stator energization step in example 1;
FIG. 3 is a three-phase current diagram of a stator in example 2;
FIG. 4 is a diagram showing a step of switching power supply to a three-phase stator winding according to embodiment 2 with zero-cross detection;
FIG. 5 is a schematic structural diagram of a system in which the lengths of the stator power supply sections are non-uniform in embodiment 3;
fig. 6 is a scheme diagram of the combined power supply steps of adjacent sections of the stator in embodiment 4.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The invention provides a long stator linear motor stator power supply method, which divides a multiphase long stator winding into subarea power supply sections electrically connected end to end along the running direction of a rotor, wherein the head and the tail of each power supply section are respectively provided with a controllable switch assembly (controllable multiphase switch assembly), and the controllable switch assemblies are controlled according to the running state of the rotor, so that the controllable switch assemblies are in a state of being connected with a power supply, a state of being connected with a neutral line or a suspended state to form different power supply loops, and the sectional power supply of the linear motor stator is realized.
Referring to fig. 2, considering the winding "Y" connection and neutral lead-out power supply mode, the control process of the connection state of the controllable switch assembly according to the operation state of the mover includes the following steps:
the first step is as follows: and in a normal running state, when the rotor is in a kth section stator power supply section, setting a head switch (a rotor operation direction front end switch) of the kth section to be switched to be connected with a power supply, and setting a kth section tail switch (a rotor operation direction rear end switch) to be switched to be connected with a neutral line, so that independent power supply for a kth section stator winding is realized.
The second step is that: and starting in a pre-connection state, wherein before the rotor enters the (k + 1) th section of stator winding, the first switch of the (k + 1) th section (the adjacent power supply section in front of the rotor in operation) is connected with a power supply, namely the first switches of the (k) th section and the (k + 1) th section are simultaneously connected with the power supply. The pre-connection state is particularly started when factors such as the running speed of the rotor and the length of a power supply section need to be considered comprehensively, the basic principle is to ensure enough time to complete the pre-connection state before the rotor enters the (k + 1) th stator winding, and the later starting is more beneficial to improving the efficiency under the premise.
The third step: and after the pre-connection state is triggered and started, before the rotor enters the (k + 1) th section of stator winding, the head switch of the k section is switched to a suspended state, and the (k + 1) th section supply power at the same time.
The fourth step: the rotor is started by 'delayed cut-off', when the rotor completely enters the (k + 1) th section, the stator tail switch (which is also the head switch of the k section) of the (k + 1) th section is switched to be connected with the neutral line, namely, the tail switches of the (k) th section and the (k + 1) th section are simultaneously connected with the neutral line. The specific time of 'delayed switching-off' also needs to comprehensively consider factors such as the operation speed of the rotor, the length of a power supply section and the like, and the basic principle is to ensure that 'the rotor completes delayed switching-off action before leaving the (k + 1) th stator segment', so that on the premise, earlier starting is more beneficial to improving the efficiency.
The fifth step: after the 'delayed cut-off' is finished, before the rotor leaves the (k + 1) th stator section, the tail switch of the (k) th stator section is switched to a suspended state, and then the (k + 1) th stator section is independently powered;
and circulating the steps from one to five, and realizing dynamic partition power supply and partition crossing processes of the stator according to the rotor operation interval.
In the process, the connection states of the head switch and the tail switch can be interchanged; the switching of the switches can be completed in a split-phase sequence, and preferably, the switching time of each phase can be selected to be the time when the current or the voltage is 0, so that the switching loss is reduced; and considering factors such as the running speed of the rotor, the power supply can be carried out across the sections, namely, the power supply and the switching control are carried out on a plurality of adjacent stator section groups simultaneously, and the lengths of the stator windings of the subarea power supply sections or the number of basic sections in the groups can be set to be inconsistent.
Example 1
The embodiment aims at a three-phase four-wire system power supply scheme, a stator three-phase winding is connected in a Y shape, and a neutral wire is led out. As shown in fig. 1, in this embodiment, the multi-phase winding is divided into divisional power supply sections (stator winding sections) electrically connected end to end in series along the rotor operation direction, the lengths of the sections are uniform, and the stator winding of each section is supplied in a divisional manner by arranging a controllable switch assembly between the stator winding of each power supply section and the power supply line and the neutral line. The long stator linear motor system of the present embodiment includes a segmented multiphase long stator winding, a mover, and a controllable switch assembly. The controllable switch assembly has 3 stable controlled connection states, which are respectively connected with a power supply and a neutral wire or suspended. In order to realize the subsection power supply of the long stator winding of the linear motor, the continuous power supply of the stator winding section where the rotor is positioned is realized through the combination of different controlled connection states of the controllable switch assembly between the adjacent sections.
In the present embodiment, only the power supply process of two adjacent stator windings is illustrated for convenience of description. Referring to fig. 2, the linear motor mover is initially operated in section 1. At this time, the tail switch and the head switch assembly of the section are respectively connected with a power supply and a neutral wire, so that the section is independently supplied with power, and at this time, the head switch of the stator winding section 2 is in a suspended state. The position of the rotor is detected in real time, position information is sent to a switch component control system, when the rotor is detected to move to the 2/3 stroke (or any other designated position defined by a setter), the first switch component of the stator winding section 2 is controlled to be connected with a power line from a suspended state, and a power supply loop enters a transition process of double power line connection. When the mover is detected to move further, namely the mover is about to enter the power supply section 2, a control command is sent to enable a head switch (or called a tail switch of the section 2) of the section 1 to be converted into a suspended state from a state of being connected with a power line, at the moment, the tail switch of the section 1 is connected with a neutral line, the head switch of the section 2 is connected with the power line, the stator winding section 1 and the section 2 form a power supply loop together, smooth passing of the mover from the section 1 to the section 2 is ensured, and current impact of switching of a power supply section is reduced. When the mover just passes through the section 1 (or is located at other designated positions of the section 2), the head switch (or tail switch of the section 2) of the section 1 is controlled to be converted from the suspension state into the neutral line coupling state, and the power supply circuit enters the transition state of double neutral line coupling. After that, the rotor continues to move forwards, when the rotor reaches the next preset designated position, the state of the tail switch of the section 1 is converted into a suspended state from the connection with the neutral line, and the power supply system independently supplies power to the section 2.
The embodiment only describes the combination condition of the switching devices in the adjacent two-section power supply interval, and the invention is also applicable to the condition of any other multi-section segmented power supply, and when the number of the power supply sections is increased, only the repeated circulation is continuously carried out according to the embodiment. The present embodiment does not distinguish the double-side winding situation, and can be easily extended to be applied to the double-side winding with reference to the present method.
Example 2
In this embodiment, the switching phases of the head switch and the tail switch are sequentially operated, and the time when the phase current is 0 is selected at each phase switching time, so that zero current switching is realized. Fig. 3 shows the stator three-phase current detected by the current detection device at the switching time.
The flow of the specific implementation steps of this embodiment is shown in fig. 4. The initial state is that the mover of the linear motor is running in section 1. At the moment, the tail switch and the head switch assembly of the section are respectively connected with the three-phase power line and the neutral line, so that the section is independently supplied with power, and the three-phase head switch of the stator winding section 2 is in a suspended state. Detecting the position of the rotor and the three-phase current of the stator and sending position information to a switch component control system, and when detecting that the rotor moves to the 2/3 stroke (or any other designated position defined by a setter) and the A-phase current is 0, controlling the A phase of the first switch device of the stator winding section 2 to be connected with a power line from a suspended state; when the phase B current is detected to be 0 under the same rotor position, the controller controls the phase B of the first switching device of the stator winding section 2 to be connected with a power line from a suspended state; when the phase C current is 0 under the same rotor position, the controller controls the phase C of the first switching device of the stator winding section 2 to be connected with a power line from a suspended state, so that the switching from the first step to the second step is completed, and a power supply loop enters a transition process of double power line connection. The subsequent steps are the same as those in embodiment 1 except that the three-phase switches are respectively turned on and off at the time of detecting zero current.
According to the requirement, the voltage zero-crossing control can be detected, or different combination methods such as voltage zero-crossing switching-on and current zero-crossing switching-off can be similar.
Example 3
In the present embodiment, the length of the divisional power supply sections is set to be uneven, as shown in fig. 5, and the respective steps of power supply switching thereof are the same as in embodiment 1. In principle, the partition length of the low speed section may be relatively short, while the partition length of the high speed section may be relatively long.
Example 4
In this embodiment, as shown in fig. 6, the primary stator winding sections are combined two by two, and each two adjacent stator winding sections are a power supply section, so as to form a stator combined power supply section, that is, two adjacent stator sections are grouped and simultaneously subjected to power supply and switching control. The corresponding procedure was exactly the same as in example 1. In principle, this embodiment may be applied to consider that the movers operate at a higher speed, in which case the power supply method proposed by the present invention can be adapted to the movers operating at a high speed, and also to consider the grouping method with different lengths to be adapted to different mover operation speeds.
The invention utilizes the simple and feasible combination of switch devices, fully utilizes the characteristic that the adjacent stator sections and the rotor have no magnetic field coupling and do not participate in electromechanical energy conversion, uses the combined stator sections as buffer sections, and is pre-accessed and cut out in a delayed manner, innovatively provides a brand-new sectional power supply method for the long stator winding of the linear motor, and technically has various conceivable technical advantages of reliability, high efficiency, low cost, easy realization and the like.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A stator power supply method of a long stator linear motor is characterized in that a multiphase long stator winding is divided into subarea power supply sections electrically connected in series from head to tail along the running direction of a rotor, and multiphase controllable switch assemblies are arranged at the head and the tail of each power supply section and are respectively called a head switch and a tail switch of the section;
according to the running state of the rotor, the controllable switch assembly is in a state of being connected with a power supply, connected with a neutral line or suspended to form different power supply loops, so that the segmented power supply of the linear motor stator is realized;
under a normal running condition, when the rotor is in a power supply section k, one of a head switch and a tail switch of the power supply section k is set to be in a state of being connected with a power supply, and the other is set to be in a state of being connected with a neutral line;
the crossing process of the mover from the power supply section k to the power supply section k +1 is completed based on the rules of pre-on and delayed off,
the "pre-turn on" rule refers to: preparing for the rotor to cross from a power supply section k to a power supply section k +1, firstly switching the first switch state of the power supply section k +1 to be consistent with the first switch state of the power supply section k, and then switching the first switch of the power supply section k to be in a suspended state;
the "delayed turn-off" rule refers to: after the mover crosses from the power supply section k to the k +1 power supply section, the tail switch state of the power supply section k +1 is switched to be consistent with the tail switch state of the power supply section k, and then the tail switch of the power supply section k is switched to be in a floating state.
2. A method of supplying power to a stator of a long stator linear motor according to claim 1, wherein the phase-splitting is controlled to switch the state of the controllable switching element.
3. A method of supplying power to a stator of a long stator linear motor according to claim 2, wherein the timing of switching the state of the controllable switch assembly in each phase is selected to be a timing at which the phase current or voltage approaches 0.
4. A method of supplying power to a stator of a long stator linear motor according to claim 1, wherein the lengths of the stator windings of the power supply sections are different.
5. A method of supplying power to a stator of a long stator linear motor according to claim 1, wherein a plurality of sections of said power supply sections are grouped to control the switching of the state of said controllable switching assembly.
6. A method of supplying power to a stator of a long stator linear motor according to claim 5, wherein the number of power supply sections in each group is different.
7. The method for supplying power to the stator of the long-stator linear motor according to claim 1, wherein the multi-phase long stator winding adopts a power supply mode of Y-shaped connection and neutral line leading-out.
8. A method of supplying power to a stator of a long stator linear motor according to claim 1, wherein a controllable switch assembly is shared between adjacent power supply sections.
9. A method of supplying power to a stator of a long stator linear motor as claimed in claim 1 wherein the start time of said pre-on and delayed off states is determined based on motor parameter factors and efficiency requirements.
10. The method of claim 9 wherein said motor parameter factors include mover operating speed and supply section length.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113420526A (en) * | 2021-07-05 | 2021-09-21 | 中国科学院电工研究所 | Real-time simulation modeling method, system and equipment for segmented power supply linear induction motor |
| CN113541435A (en) * | 2021-06-29 | 2021-10-22 | 中国科学院电工研究所 | Distributed linear motor propulsion system and power supply method |
| CN113759712A (en) * | 2021-07-27 | 2021-12-07 | 中国科学院电工研究所 | Modeling method, system and equipment for unequal length segmented power supply linear induction motor |
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| CN113420526B (en) * | 2021-07-05 | 2023-07-28 | 中国科学院电工研究所 | Real-time simulation modeling method, system and equipment for sectional power supply linear induction motor |
| CN113759712A (en) * | 2021-07-27 | 2021-12-07 | 中国科学院电工研究所 | Modeling method, system and equipment for unequal length segmented power supply linear induction motor |
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