CN205123505U - Linear electric motor wiping formula segments to supply power auto -change over device - Google Patents

Abstract

Linear motor sliding contact segmental power supply switching device, which includes a stator track fixed on the hoistway frame or foundation, a power bus, a multi-section unit motor stator module arranged in the stator track, and an electric motor corresponding to the unit motor stator module. For the mover, at least one group of unit motor stator windings is connected to at least one group of segmented power supply mechanisms used to switch normally open main contacts, and the segmented power supply mechanism is a slide switch; during the movement of the mover, any coupling with the mover In the overlapped stator winding, the sliding contact switch is turned on to obtain electric energy; while in the stator winding in the non-overlapping area of the mover, the sliding contact switch is not conducting, and is in a power-off state, realizing the sliding contact segmental power supply. Compared with the prior art, the utility model has complex segmented power supply switching mechanism of traditional linear motor drive system, low reliability and high cost. The automatic linear motor segmented power supply switching device of the utility model is simple in structure, safe and reliable, economical and applicable .

Description

Linear motor slide-contact segmental power supply switching device

technical field

The utility model relates to the field of linear motor drives, in particular to a segmental power supply and switching device for a linear motor drive system.

Background technique

Linear motor drive systems have been widely used in various industries. In long-stroke applications such as linear motor subways, direct drive elevators, and linear motor automated assembly lines, the structure of long primary and short secondary linear motors is generally used, and its power supply technology has become one of the key technologies. Currently, there are two main types of schemes: overall continuous power supply and segmental power supply. The structure and control of the overall continuous power supply mode are simple, but the empty consumption of the entire power supply line is very serious. The significance of using segmented power supply is that it can significantly improve efficiency, save electric energy, reduce power supply capacity and drive power. Segmented power supply also meets the requirements of modularization and standardization, which is conducive to manufacturing, installation, maintenance and use. At present, the commonly used segmented power supply includes power devices such as IGBT, thyristor, and solid state relay, or electronic switching methods of power switches, and electromagnetic and mechanical switching methods such as contactors. Figure 1 shows the schematic diagram of the segmental power supply switching of the existing direct drive system. Each unit motor is equipped with a normally open and normally closed bidirectional main contact. N groups of unit motors have N groups of normally open and normally closed bidirectional main contacts. The quantity is so large that it is necessary to arrange a large number of position detection sensors along the way, special protection circuits, programmable controllers, upper computers and other processing devices. , Switching is unreliable and other defects, and electronic switching is difficult to achieve direct drive elevators and other application fields permanent magnet linear motor passive power generation braking protection (automatically short circuit all motor windings in case of power failure to protect the car from "never falling") .

Utility model content

The technical problem to be solved by the utility model is to provide a linear motor segmental power supply switching device with simple structure, safe and reliable, economical and applicable. Costly technical issues.

The utility model is realized through the following technical solutions:

Linear motor sliding contact segmental power supply switching device, which includes a stator track fixed on the hoistway frame or foundation, a power bus, a multi-section unit motor stator module arranged in the stator track, and an electric motor corresponding to the unit motor stator module. The mover is characterized in that: at least one group of unit motor stator windings is connected to at least one group of segmented power supply mechanisms used as switching normally open main contacts, and the segmented power supply mechanisms are slide switches; during the movement of the mover, any In the stator winding that overlaps with the mover, the slide switch is turned on to obtain electric energy; while the stator winding in the non-overlapping area of the mover, the slide switch is not turned on, and is in a power-off state, realizing the sliding contact segmental power supply.

The segmented power supply mechanism refers to one or two rows of sliding contact rails arranged along the moving direction of the hoistway mover. The sliding contact rails include power sliding contact rails and unit motor sliding contact rails, wherein the power supply sliding contact rails are The continuum connected with the power line, the sliding contact rail of the unit motor is composed of multiple conductors arranged intermittently, the length of each conductor is consistent with the longitudinal length of the stator of the unit motor, and insulating blocks are set between two adjacent conductors, and the stator of each unit motor The windings are respectively connected to the conductors corresponding to the unit motor sliding contact rails through wires, and the conductors are insulated from each other; at least one set of freely sliding brushes is set between the power supply sliding contact rail and the unit motor sliding contact rail. The brush is consolidated with the mover through the insulating rod, and moves with the movement of the mover; when the brush is located at the position of the stator of the corresponding unit motor, the electric energy on the power sliding contact rail is fed to the sliding contact rail connected with the unit motor through the sliding contact of the brush. The stator winding of the unit motor; when the brush moves beyond the range of the stator winding, the brush is separated from the sliding contact rail corresponding to the unit motor, and the stator winding of the unit motor is de-energized.

Two rows of sliding contact conductor rails are arranged in parallel and separated, or two rows of sliding contact conductor rails are arranged in parallel in an integrated structure.

The power supply sliding contact rail is a semi-closed U-shaped groove-shaped sliding contact rail with a continuous conductor inside, and the unit motor sliding contact rail is a semi-closed U-shaped groove-shaped sliding contact rail with a discontinuous conductor with interval insulating blocks inside; two semi-closed The two brushes corresponding to the U-shaped groove sliding contact rails connected by conductor rods are insulated and connected to the mover, and cooperate with the two half-closed U-shaped groove sliding contact rails, the unit motor stator winding and the moving element to form at least one set of sliding contacts switch.

The power sliding contact rail and the unit motor sliding contact rail share a row of sliding contact conductive rails, one side of the sliding contact conductive rail is a continuous arrangement of conductors connected to the power line, and the other side is a sliding contact rail with spaced insulating blocks connected to the unit motor stator The windings are connected, the bottom or both sides of the sliding contact rail are insulators, and the brushes connected to the insulation of the mover are arranged with the sliding contact rail, the stator winding of the unit motor and the mover to form at least one set of sliding contact switches.

The shared row of sliding contact conductor rails is a semi-closed U-shaped groove sliding contact rail.

The semi-closed U-shaped groove sliding contact rail is provided with an electromagnetic shielding layer on the outer surface or arranged in a semi-closed "concave" electromagnetic shielding groove along the unit motor frame or along the way. The brush can extend into the semi-closed "concave". The "shaped electromagnetic shielding groove is set in cooperation with the semi-closed U-shaped groove sliding contact rail.

At least one set of contactors or power switches with normally open and normally closed two-way main contacts are connected to the power bus side, and the at least one set of sliding contact switches and the stator winding of the unit motor are connected to form a unit motor short-circuit generator braking protection circuit .

Any group of sliding touch switches described above is connected to the intermediate control circuit or signal circuit as the auxiliary contact of the position switch or the position sensor or the intermediate relay, and turns on and off the power of the power supply main circuit of each unit motor or unit actuator in turn. Electronic devices or power electronic switches.

Compared with the prior art, the utility model has complex segmented power supply switching mechanism of traditional linear motor drive system, low reliability and high cost. The automatic linear motor segmented power supply switching device of the utility model is simple in structure, safe and reliable, economical and applicable .

Description of drawings

Fig. 1 is the schematic diagram of electrical main wiring of existing linear motor segmental power supply;

Fig. 2 is the electrical main wiring schematic diagram of the present utility model;

Fig. 3a is a schematic diagram of the single-phase sliding contact segmented power supply of the utility model;

Figure 3b is a schematic diagram of the three-phase sliding contact segmental power supply of the present invention;

Fig. 4 is the front view of the structural schematic diagram 1 of the sliding contact switch of the present invention;

Fig. 5 is a top view of the structural schematic diagram 1 of the sliding touch switch of the present invention;

Fig. 6 is the front view of the utility model slide switch structure schematic diagram II;

Fig. 7 is a top view of the second structural schematic diagram of the sliding touch switch of the present invention.

detailed description

Figure 2 shows the segmental power supply switching device of the linear drive system of the present utility model, including stator rails, power lines, multiple unit motors and their stator windings fixed on the frame or the foundation along the way, and the dynamic motor corresponding to the stator windings of the unit motors. sub, segmental power supply switching structure. Set at least one set of contactors or power switches with normally open and normally closed bidirectional main contacts on the power bus. The normally open main contact, as shown in Figure 2, also achieves the effect of electric and power generation braking in Figure 1, but the circuit is very simple and saves a lot of equipment costs.

Figure 2 perfectly realizes the linear drive system's electric and power generation braking functions, but in order to realize segmental power supply, it is necessary to make the switched normally open main contact C1 capable of reliable action and breaking according to segmental power supply requirements. In order to achieve the above purpose, the following technical solutions are adopted:

As shown in Figure 3a, take A-phase power supply as an example. The principle of sliding contact power supply is as follows: arrange two rows of straight sliding contact rails in parallel along the moving direction of the hoistway mover, the power sliding contact rail 3 and the unit motor sliding contact rail 4, the power sliding contact rail 3 is a continuous body, through the bus switch Connect with the power supply on the ground (Phase A in the picture). The sliding contact rail 4 of the unit motor is composed of multiple sections of conductors arranged intermittently. The length of each section of conductor is consistent with the longitudinal length of the motor stator. The interval between two adjacent sections of conductors is consistent with the interval between the motor stator modules. The wires are connected to the corresponding segments of the unit motor sliding contact rail 4, and each segment is insulated from each other. Between the power sliding contact rail 3 and the unit motor sliding contact rail 4, free-sliding brushes 2 with the same number of stator segments or the same length as the mover are set, and each brush 2 passes through the insulating rod 20 and the mover 18 respectively. Consolidation, each brush 2 moves with the movement of the mover 18, when the brush is located at the corresponding stator position, the electric energy on the power sliding contact rail 3 is fed to the stator connected to the unit motor sliding contact rail 4 through the brush sliding contact Winding; when the brushes move beyond the range of the corresponding stator windings, the sliding contact rail 4 of the unit motor is separated from the corresponding brushes, and the corresponding stator windings are de-energized. In this way, during the moving process of the mover, all the stator windings that overlap with the mover get electric energy through the brushes, and the stator in the non-overlapping area of the mover is in a power-off state because there is no brush connected, and the sliding is realized. Touch segment power supply.

Fig. 3b is a schematic diagram of sliding contact segmental power supply powered by three-phase power supply. The power supply principle of the three phases A, B and C is the same, the brushes 2 of the B phase and the C phase are consolidated into a whole with the brush 2 of the A phase through the insulating rod 20, and move with the movement of the mover. The principle of supplying more phase windings is the same.

According to the principle in Fig. 3, a more practical structure can be evolved, and Fig. 4 is a schematic diagram of the segmental power supply structure of the slide switch. The power sliding contact rail 3 and the unit motor sliding contact rail 4 are integrated in a semi-closed U-shaped groove. The power supply sliding contact rail 3 is a semi-closed U-shaped groove-shaped sliding contact rail with a continuous conductor inside, which is connected to the power line, and the unit motor sliding contact rail 4 is a semi-closed U-shaped groove-shaped sliding contact with a non-continuous conductor with an insulating block inside. The rails are connected to the motor stator windings of each unit. Two rows of sliding contact conductor rails are arranged in parallel and separated, or two rows of sliding contact conductor rails are arranged in parallel in an integrated structure. The two brushes 2 connected by conductor rods 1 on the mover are arranged in cooperation with two semi-closed U-shaped groove sliding contact rails, the unit motor and the mover respectively to form several groups of sliding contact switches. When the brush 2 slides down from the (N+1)# unit motor, the (N+1)# stator winding coil is energized, and then the (N)# unit motor and (N-1)# unit motor are energized in turn, so that By analogy, the effect of segmented power supply is achieved, as shown in Figure 4 and Figure 5 .

It is also possible to share the semi-closed U-shaped slot sliding contact rail with the power line and the stator winding of each unit motor. One side of the semi-closed U-shaped slot is connected with the power line by a continuous arrangement of wires, and the sliding contact rail with an insulating block 40 on the other side is respectively Connected with the stator windings of each unit motor, the bottom of the semi-closed U-shaped slot or between the two sides is insulated 40, and the brushes on the mover are set with the half-closed U-shaped slot sliding contact rail and the unit motor and mover to form several groups. Slide switch. This solution only needs a set of brushes on the mover side to meet the segmental power supply requirements, as shown in Figure 6 and Figure 7. This scheme can not only achieve the principle effects shown in Figure 4 and Figure 5, but also save a lot of materials, reduce production and installation costs, and save costs.

In order to reduce the electromagnetic interference of sliding contact rails and brushes to the surrounding environment, the semi-closed U-shaped groove sliding contact rails in Figure 4, Figure 5, Figure 6 and Figure 7 can be equipped with electromagnetic shielding layers on the outer surface, or arranged along the unit In the semi-closed "concave" electromagnetic shielding groove set up on the motor frame or along the way, the brush can be inserted into the semi-closed "concave" electromagnetic shielding groove and set in cooperation with the semi-closed U-shaped groove sliding contact rail.

In addition, in order to ensure safe operation, at least one set of contactors or power switches with normally open and normally closed bidirectional main contacts are connected to the side of the power bus, which cooperates with the at least one set of sliding contact switches and the stator winding of the unit motor to form a unit motor Short circuit generator braking protection circuit.

In addition, it can also be optimized that any group of sliding touch switches is connected to the intermediate control circuit or signal circuit as an auxiliary contact of a position switch or a position sensor or an intermediate relay, and is used to turn on and off each unit motor or The power electronic device or power electronic switch of the power supply main circuit of the unit actuator.

The above-mentioned embodiments are only to illustrate the technical conception and characteristics of the present utility model, and its purpose is to allow those familiar with this technology to understand the content of the utility model and implement it accordingly, and not to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model.

Claims (9)

1. linear electric motors slide-contact-type sectional power supply switching device shifter, it comprises the stator track be fixed on hoistway frame or basis, power source bus, the multistage unit motor stator module be arranged in stator track, and the electric mover corresponding with unit motor stator module, it is characterized in that: at least one group of unit motor stator winding accesses at least one group as switching the sectional power supply mechanism often opening main contacts and use, and sectional power supply mechanism is wiping switch; In mover moving process, every overlapping stator winding that is coupled with mover, wiping switch conduction obtains electric energy; And with the stator winding of mover Non-overlapping Domain, the not conducting of wiping switch, is in off-position, realizes wiping sectional power supply.

2. linear electric motors slide-contact-type sectional power supply switching device shifter according to claim 1, it is characterized in that: described sectional power supply mechanism refers to: row or the two row wiping conductor rails arranged along the hoistway mover direction of motion, wiping conductor rail comprises power supply wiping rail (3) and unit motor wiping rail (4), wherein, power supply wiping rail (3) is the non-individual body be connected with power line, unit motor wiping rail (4) is made up of the multistage conductor being interrupted arrangement, the length of every section of conductor is consistent with the longitudinal length of unit motor stator, adjacent two sections of conductor separation arrange collets, each segment unit motor stator winding connects respectively by wire each section of conductor corresponding to unit motor wiping rail (4), mutually insulated between each section of conductor, between power supply wiping rail (3) and unit motor wiping rail (4), arrange at least one group of brush that can be free to slide (2), brush (2), by insulating bar (20) and mover (18) consolidation, moves with mover (18) and moves, when brush is positioned at corresponding unit motor stator position, the electric energy on power supply wiping rail (3) is fed to the unit motor stator winding be connected with unit motor wiping rail (4) by brush wiping, when brush moves on to outside this stator winding scope, the wiping rail (4) that brush is corresponding with this unit motor departs from, this unit motor stator winding power-off.

3. linear electric motors slide-contact-type sectional power supply switching device shifter according to claim 2, is characterized in that: the parallel apart arrangement of two row wiping conductor rails, or two row wiping conductor rails are arranged in parallel and are structure as a whole.

4. linear electric motors slide-contact-type sectional power supply switching device shifter according to claim 3, it is characterized in that: power supply wiping rail (3) is the inner semi-closed port U-lag shape wiping rail with continuous conductor, the semi-closed port U-lag shape wiping rail that unit motor wiping rail (4) is the discontinuous conductor of inner band spacer insulator block; Corresponding two brushes (2) be connected by stub (1) of two semi-closed port U-lag wiping rails are insulated with mover (18) and are connected, and coordinate two semi-closed port U-lag wiping rails, unit motor stator winding and mover to arrange, form at least one group of wiping switch.

5. linear electric motors slide-contact-type sectional power supply switching device shifter according to claim 2, it is characterized in that: power supply wiping rail (3) and unit motor wiping rail (4) share a row wiping conductor rail, wherein wiping conductor rail side is that continuous arrangement of conductors is connected with power line, opposite side is the wiping rail of band spacer insulator block and is connected with unit motor stator winding, be insulator bottom wiping conductor rail or between both sides, coordinate wiping conductor rail, unit motor stator winding and mover to arrange with the mover brush be connected that insulate, form at least one group of wiping switch.

6. linear electric motors slide-contact-type sectional power supply switching device shifter according to claim 5, is characterized in that: a described shared row wiping conductor rail is semi-closed port U-lag wiping rail.

7. the linear electric motors slide-contact-type sectional power supply switching device shifter according to claim 4 or 6, it is characterized in that: described semi-closed port U-lag wiping rail powers up magnetic masking layer at outer surface or is arranged in along in semi-closed port " recessed " the shape electromagnetic shielding groove of unit electric motor stand or basis instrument on the way, and brush can stretch in semi-closed port " recessed " shape electromagnetic shielding groove and be equipped with semi-closed port U-lag wiping rail.

8. linear electric motors slide-contact-type sectional power supply switching device shifter according to claim 1; it is characterized in that: power source bus side joint enters contactor or the mains switch of at least one group of band normally-open normally-close two-direction, main contact, coordinate Component units motor short circuit dynamic brake protective circuit with at least one group of described wiping switch, unit motor stator winding.

9. linear electric motors slide-contact-type sectional power supply switching device shifter according to claim 1, it is characterized in that: arbitrary group of described wiping switch accesses middle control circuit or signal circuit as the auxiliary contact of position switch or position transducer or auxiliary relay, turns on and off power electronic device or the power electronic switching of the main circuit power supply of each unit motor or unit actuator successively.