CN214314877U - Permanent magnet low-voltage high-power motor and stator junction box thereof - Google Patents

Abstract

The present disclosure provides a permanent magnet low-voltage high-power motor and a stator junction box thereof, the stator junction box comprises: a junction box body; the three insulating wiring boards are arranged in the wiring box body side by side; the three-phase conducting bar comprises three conducting bars, the three conducting bars are arranged on three insulating wiring boards respectively, each conducting bar comprises a first conducting strip and a second conducting strip, the first conducting strips are perpendicularly connected with the second conducting strips, a plurality of first wiring fasteners are arranged on the first conducting strips, a plurality of second wiring fasteners are arranged on the second conducting strips, the plurality of first wiring fasteners are used for being respectively connected into a multi-strand power cable, and the plurality of second wiring fasteners are used for being respectively connected into a multi-strand stator lead wire. The stator junction box can bear large current and is suitable for a low-voltage high-power motor.

Description

Permanent magnet low-voltage high-power motor and stator junction box thereof

Technical Field

The disclosure relates to the technical field of motors, in particular to a permanent magnet low-voltage high-power motor and a stator junction box thereof.

Background

The motor is a device for converting electric energy into mechanical energy, and can be used for driving various mechanical devices, such as a fan, a water pump and other devices. The motor mainly comprises two basic parts, namely a stator and a rotor, and the motor generates a rotating magnetic field by utilizing a stator winding and acts on the rotor to form magnetoelectric power rotating torque.

The stator generally comprises a stator core and a stator winding, and the stator winding is connected with a stator junction box through an outgoing line. Many mechanical devices require a high-power motor to provide driving force, and the rated current of a stator of the low-voltage high-power motor is larger, so that the requirement for the current carried by a junction box is higher and higher.

SUMMERY OF THE UTILITY MODEL

The disclosure provides a permanent magnet low-voltage high-power motor and a stator junction box thereof.

In a first aspect, the present disclosure provides a stator terminal box comprising: a junction box body; the three insulating wiring boards are arranged in the wiring box body side by side; the three-phase conducting bar comprises three conducting bars, the three conducting bars are arranged on three insulating wiring boards respectively, each conducting bar comprises a first conducting strip and a second conducting strip, the first conducting strips are perpendicularly connected with the second conducting strips, a plurality of first wiring fasteners are arranged on the first conducting strips, a plurality of second wiring fasteners are arranged on the second conducting strips, the plurality of first wiring fasteners are used for being respectively connected into a multi-strand power cable, and the plurality of second wiring fasteners are used for being respectively connected into a multi-strand stator lead wire.

In some optional embodiments, the junction box body comprises a junction box cover and a junction box base, the junction box cover is covered on the junction box base, and a box cover sealing gasket is arranged between the junction box cover and the junction box base.

In some optional embodiments, the stator junction box further comprises: and the wiring holes are arranged on the wiring box base along the first direction and are close to the three insulating wiring boards, and the wiring holes are used for leading wires of the multi-strand stator to be connected.

In some optional embodiments, the stator junction box further comprises: and the plurality of waterproof joints are arranged on the terminal box base along the direction perpendicular to the first direction and are used for the access of a plurality of strands of power cables.

In some alternative embodiments, the first wire fastener includes a first wire bolt fixedly connected to the first conductive sheet and a first wire nut for pressing the stator lead wire onto the first wire bolt.

In some alternative embodiments, the second wire fastening member includes a second wire bolt fixedly connected to the second conductive sheet and a second wire nut for pressing the power cable onto the second wire bolt.

In some alternative embodiments, the number of first wiring fasteners is seven, the number of second wiring fasteners is seven, and the number of watertight joints is eight.

In some alternative embodiments, the three insulated terminal blocks are different lengths so that the three conductive bars are arranged in a stepped arrangement.

In a second aspect, the present disclosure provides an electric machine comprising: stator, rotor, frame, motor spindle and as the stator terminal box of first aspect: the stator is arranged on the base, surrounds the rotor, and rotates around the motor spindle; the stator junction box is arranged on the base and electrically connected with the stator.

In some optional embodiments, the motor further comprises: and the box seat sealing gasket is arranged between the base and a junction box seat in the stator junction box.

The utility model provides a permanent magnetism low pressure high-power motor and stator terminal box thereof sets up a plurality of second wiring fasteners on the second conducting strip of every looks conducting bar, can insert stranded stator lead wire respectively, sets up a plurality of first wiring fasteners on the first conducting strip of every looks conducting bar, can insert stranded power cable respectively simultaneously, satisfies the operation condition that the motor heavy current passes through. The stator junction box can bear large current and is suitable for a low-voltage high-power motor.

Drawings

Other features, objects and advantages of the disclosure will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 is a first perspective view of one embodiment of a stator junction box according to the present disclosure;

FIG. 2 is a second perspective view of one embodiment of a stator terminal block according to the present disclosure;

FIG. 3 is a schematic structural diagram of one embodiment of an electric machine according to the present disclosure;

fig. 4 is a cross-sectional view of one embodiment of a stator and a rotor of an electric machine according to the present disclosure.

Description of the symbols:

1-a junction box body, 1 a-a junction box cover, 1 b-a junction box base, 2-an insulating junction board, 3-a three-phase conducting bar, 3 a-a first conducting bar, 3 b-a second conducting bar, 4-a stator lead wire, 5-a waterproof joint, 6-a phase sequence mark, 7-a grounding device, 8-a wiring indication diagram, 9-a box cover sealing gasket, 10-a box base sealing gasket, 11-a stator, 12-a rotor, 13-a machine base, 14-a motor spindle, 15-a stator junction box, 16-a shaft extension end bearing assembly (insulating structure), 17-a shaft extension end cover, 18-a fan motor, 19-a magnetism isolating baffle, 20-a cooling axial fan, 21-a cooler, 22-a permanent magnet and 23-a ventilation duct cushion block, 24-stator core, 25-stator winding, 26-rotor core, 27-tensioning screw rod, 28-non-axial-extension end cover, 29-non-axial-extension-end bearing assembly (insulation structure), 30-non-axial-extension-end bearing oil discharger, 31-grounding signboard, 32-grounding bolt, 33-base cover plate, 34-tensioning wedge strip, 35-key, 36-amplitude plate, 37-air gap and 38-tensioning bolt hole.

Detailed Description

The present disclosure is described in further detail below with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the relevant portions of the related inventions are shown in the drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

It should be noted that, in the present disclosure, the embodiments and features of the embodiments may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1 and 2, fig. 1 is a first perspective view of an embodiment of a stator junction box according to the present disclosure, and fig. 2 is a second perspective view of an embodiment of a stator junction box according to the present disclosure. As shown in fig. 1 and 2, the stator junction box includes: a junction box body 1, three insulating wiring boards 2 and a three-phase conducting bar 3. Wherein, the three insulated wiring boards 2 are arranged in the wiring box body 1 side by side; three-phase conducting bar 3, including three conducting bar, three conducting bar is located respectively on three insulating wiring board 2, conducting bar includes first conducting strip 3a and second conducting strip 3b, first conducting strip 3a is connected perpendicularly with second conducting strip 3b, be equipped with a plurality of first wiring fasteners on the first conducting strip 3a, be equipped with a plurality of second wiring fasteners on the second conducting strip 3b, a plurality of first wiring fasteners are used for inserting stranded power cable respectively, a plurality of second wiring fasteners are used for inserting stranded stator lead wire 4 respectively.

The junction box body 1 has a cavity structure.

The three insulated wiring boards 2 not only can perform an insulating function, but also can be used for fixing the position of the three-phase conducting bar 3.

The three conductive bars correspond to each phase (U-phase, V-phase, W-phase) of three-phase power, respectively.

The first conductive sheet 3a may be provided in the longitudinal direction or the width direction of the junction box body 1, for example. The second conductive sheet 3b may be provided, for example, in the height direction of the junction box body 1.

In practice, the number of strands of stator lead wires 4 and power cables to be introduced can be determined according to the current capacity to be carried, and the number of the first and second wiring fasteners can be set.

In some alternative embodiments, the junction box body 1 may include a junction box cover 1a and a junction box base 1b, the junction box cover 1a covers the junction box base 1b, and a box cover gasket 9 is disposed between the junction box cover 1a and the junction box base 1 b.

The junction box cover 1a is fixedly connected with the junction box base 1b, and can be sealed through the box cover sealing gasket 9, so that the protection capability of the stator junction box is integrally improved, and the normal use and operation requirements of the stator junction box in different environments are met.

In some optional embodiments, the stator junction box may further include: and the wiring holes are arranged on the wiring box base 1b along the first direction and are close to the three insulating wiring boards 2, and the wiring holes are used for connecting the multi-strand stator lead wires 4.

Here, the first direction may be, for example, a longitudinal direction or a width direction of the junction box body 1.

In some optional embodiments, the stator junction box may further include: and the plurality of waterproof connectors 5 are arranged on the terminal box base 1b along the direction perpendicular to the first direction, and the plurality of waterproof connectors 5 are used for connecting a plurality of strands of power cables.

Here, the direction perpendicular to the first direction may be, for example, a height direction of the junction box body 1.

In practice, the power cable has a large diameter and is not easy to bend, and the power cable can be connected to the first conductive sheet 3a through the waterproof connector 5 without bending.

In some alternative embodiments, the first wiring fastener may include a first wiring bolt fixedly connected to the first conductive sheet 3a and a first press nut for pressing the stator lead wire 4 onto the first wiring bolt.

In some alternative embodiments, the second wiring fastener may include a second wiring bolt fixedly connected to the second conductive sheet 3b and a second press nut for pressing the power cable onto the second wiring bolt.

In some alternative embodiments, the number of the first wiring fasteners may be seven, the number of the second wiring fasteners may be seven, and the number of the watertight joint 5 may be eight.

In some alternative embodiments, the lengths of the three insulated wiring boards 2 may be different so that the three conductive bars are arranged in a stepped fashion.

The three conductive bars are arranged in a step shape, so that the space inside the stator junction box can be fully utilized, and sufficient electric clearance and creepage distance between the three conductive bars are ensured, so that the safety performance of the stator junction box is ensured.

Three lead electrical drainage space three-dimensional installation can conveniently insert stator lead wire 4 and supply cable, improves the convenient operation nature of wiring.

In practice, the arrangement and installation mode of the three conductive bars can be adjusted according to actual use conditions.

In some optional embodiments, the stator junction box may further include: and a grounding device 7 provided on the junction box body 1.

In some optional embodiments, the stator junction box may further include: a phase sequence identification 6 arranged on the three-phase conductive bar 3.

In some optional embodiments, the stator junction box may further include: wiring indications provided on the junction box body 1 are shown in fig. 8.

The utility model provides a stator terminal box sets up a plurality of second wiring fasteners on the second conducting strip 3b of every looks conducting bar, can insert stranded stator lead wire 4 respectively, sets up a plurality of first wiring fasteners on the first conducting strip 3a of every looks conducting bar, can insert stranded power cable respectively simultaneously, satisfies the operating condition that motor heavy current passes through. The stator junction box can bear large current and is suitable for a low-voltage high-power motor.

Referring to fig. 3 and 4, fig. 3 is a schematic structural view of an embodiment of a motor according to the present disclosure, and fig. 4 is a sectional view of an embodiment of a stator and a rotor of a motor according to the present disclosure. As shown in fig. 3 and 4, the motor includes: stator 11, rotor 12, housing 13, motor spindle 14, and stator terminal box 15 in fig. 1 and 2. Wherein, the stator 11 is arranged on the base 13, the stator 11 surrounds the rotor 12, and the rotor 12 rotates around the motor spindle 14; the stator junction box 15 is arranged on the base 13, and the stator junction box 15 is electrically connected with the stator 11.

The stator 11 may include, for example, a stator core 24 and a stator winding 25.

In some optional embodiments, the motor may further include: and a cassette seat gasket 10 disposed between the base 13 and the terminal cassette seat 1b in the stator terminal box 15.

The box base sealing gasket 10 can be arranged on the outer side wall (the outer side wall contacted with the base 13) of the junction box base 1b, and the stator junction box 15 and the base 13 can be sealed through the box cover sealing gasket 9, so that the protection capability of the motor is integrally improved, and the normal use and operation requirements of the motor under different environments are met.

In some alternative embodiments, the electric machine may be a permanent magnet synchronous machine.

In some alternative embodiments, the main motor parameters may be: the motor has the advantages of 690 volts of rated voltage, 1700 kilowatts of rated power, 4 poles of motor poles, 50 Hz of rated frequency, 3-phase star connection of stator connection, 97.9 percent of efficiency, 0.99 of power factor, F level of insulation level, 1500 rpm of output synchronous rotating speed, IC666 of motor cooling mode, IP55 of protection level and 10822.6N.m (Newton meter) of rated torque.

The motor has the characteristics of high efficiency, high power factor, large torque, high maximum output power and the like, reduces the design and manufacturing cost, and is safe, reliable and convenient to control.

In some alternative embodiments, the stator winding 25 connection may be a star connection, and the number of parallel connections is 4. The stator winding 25 may be comprised of a plurality of coils, with a stator winding 25 pitch of 13 slots, a stator slot fill factor of 85.6%, and a stator current density of 3.99 amps/cubic millimeter designed. The stator iron core 24 and the rotor iron core 26 can be made of 50WW470 high-performance low-loss silicon steel sheets, the stator winding 25 can be made of F-grade polyimide insulated flat copper wires, and after wire embedding, vacuum pressure paint dipping and immersion process treatment are carried out, so that the insulation strength of the winding is increased, and the requirement of the F-grade insulation grade is met.

The stator core 24 may be formed by stacking a plurality of stator laminations. Rotor core 26 may be formed by stacking a plurality of rotor sheets.

In some alternative embodiments, the stator winding 25 may be sized, the stator winding 25 may be wrapped with insulation, embedded in the stator core 24 to form the stator 11, and vacuum pressure dip painted and pressed into the housing 13 with the weld locations held in fixed positions.

In some alternative embodiments, the motor spindle 14 is laminated with a rotor core 26, wherein the rotor core 26 is segmented into 16 sections, the middle of the rotor core is separated by 15 ventilation channels, one end of the rotor core is pressed by a magnetic isolation baffle 19, a tension screw 27 is penetrated and a fastener is fixed at one end, the permanent magnets 22 and ventilation channel cushion blocks are distributed and embedded according to the requirement of the number of magnetic poles, and magnetic steel glue is coated at the same time.

In some optional embodiments, the motor may further include: the shaft-extension end bearing assembly (insulation structure) 16. The bearing assembly (insulation structure) at the shaft extension end can adopt a common bearing, and the bearing sleeve is subjected to insulation treatment, so that the current corrosion of the shaft current passing through the bearing is isolated, and the insulation technology of the bearing damage is prevented.

In some alternative embodiments, the insulation resistance is measured after the shaft end bearing assembly (insulation structure) 16 is installed in the shaft end cover 17, and the fasteners are respectively connected with the insulation bearing assembly and the machine base 13 after the insulation resistance reaches a required value.

In some alternative embodiments, the non-shaft end cap 28 is enclosed in a non-shaft end bearing assembly (insulation) 29.

All bearings of the motor adopt an insulation technology to ensure a loop for isolating the shaft current, and the damage of the shaft current to the bearings is fully avoided, so that the integral reliability of the product is improved, and the service life of the product is prolonged.

In some alternative embodiments, the shaft-end bearing assembly (insulation structure) 16 and the non-shaft-end bearing assembly (insulation structure) 29 are designed with a waste grease removal structure as shown by the non-stop oil filler hole and the non-shaft-end bearing grease discharger 30. The electric motor can be prevented from generating faults due to the lack of lubricating grease, and the motor can be ensured to continuously and reliably provide power.

In some optional embodiments, the motor may further include: the cooler 21, install 2 blower motors 18 outside the cooler 21 separately, carry on the circulation of the internal ventilation in the cooler 21 with the fan, install the axial fan 20 of cooling on the side of the cooler 21 at the same time, form the heat and cold exchange of outside, achieve the radiating purpose.

In some optional embodiments, the motor may further include: the grounding signboard 31 and the grounding bolt 32 arranged on the machine base 13 ensure the reliable grounding of the motor.

In some alternative embodiments, the left and right sides of the base 13 may be provided with base covers 33 for detachable viewing of the interior of the motor.

In some alternative embodiments, the rotor 12 may be a permanent magnet rotor.

In some alternative embodiments, rotor core 26 may be made of wu steel laminated with high-performance low-loss silicon steel sheets having a designation of 50WW470, and rotor core 26 has permanent magnets 22 embedded in its slots, wherein permanent magnets 22 are strong ndfeb N38SH magnets. Because the maximum width of the permanent magnet 22 in one magnetic pole can be 310 mm, the strength of the whole magnetic steel is reduced, and 5 pieces of 62 mm magnetic steel can be arranged in a side-by-side structure, so that the process rationality when the magnetic steel is embedded can be improved.

In some alternative embodiments, the tension wedge 34 fixes the permanent magnet 22(5 pieces of magnetic steel) against loosening. The motor main shaft 14 can be uniformly welded with 4 webs 36 around, and forms an integrated firm permanent magnet rotor structure with the rotor core 26 by the key 35.

In some alternative embodiments, tension bolt holes 38 may be provided on rotor core 26.

In some alternative embodiments, the outer diameter of the stator is 850 mm, the inner diameter of the stator is 560 mm, the inner diameter of the rotor is 280 mm, the size of the air gap 37 between the stator 11 and the rotor 12 is 2.5 mm, the clear length of the stator core 24 and the rotor core 26 is 750 mm, the number of radial ventilation channels of the stator core 24 and the rotor core 26 is 15, the width of the ventilation channels is 10 mm, the number of stator slots is 60, the stator slots are uniformly distributed, the stator slots adopt open slot type, the stator winding 25 adopts a formed winding, and the double-laminated lower wire is adopted.

The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present disclosure is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present disclosure. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.

Claims (10)

1. A stator terminal block, comprising:

a junction box body;

the three insulating wiring boards are arranged in the wiring box body side by side;

the three-phase conducting bar comprises three conducting bars, the three conducting bars are respectively arranged on three insulating wiring boards, each conducting bar comprises a first conducting strip and a second conducting strip, the first conducting strips are vertically connected with the second conducting strips, a plurality of first wiring fasteners are arranged on the first conducting strips, a plurality of second wiring fasteners are arranged on the second conducting strips, the plurality of first wiring fasteners are used for being respectively connected into a multi-strand power cable, and the plurality of second wiring fasteners are used for being respectively connected into a multi-strand stator lead wire.

2. The stator junction box of claim 1, wherein the junction box body comprises a junction box cover and a junction box base, the junction box cover is covered on the junction box base, and a box cover sealing gasket is arranged between the junction box cover and the junction box base.

3. The stator junction box of claim 2, further comprising:

and the wiring holes are arranged on the wiring box base along the first direction and are close to the three insulating wiring boards, and the wiring holes are used for the access of the stranded stator lead wires.

4. The stator junction box of claim 2 or 3, further comprising:

and the waterproof connectors are arranged on the junction box base along the direction perpendicular to the first direction and are used for the multi-strand power cable to be connected.

5. The stator terminal block of claim 1, wherein the first wire fastener includes a first wire bolt fixedly connected to the first conductive tab and a first wire nut for pressing the stator lead wire onto the first wire bolt.

6. The stator junction box of claim 1, wherein the second wire fastener comprises a second wire bolt fixedly connected to the second conductive tab and a second wire nut for pressing the power cable onto the second wire bolt.

7. The stator junction box of claim 4, wherein the number of first wiring fasteners is seven, the number of second wiring fasteners is seven, and the number of watertight joints is eight.

8. The stator terminal block of claim 1, wherein the three insulating terminal plates are different in length so that the three conductive bars are arranged in a stepped arrangement.

9. An electric machine comprising a stator, a rotor, a housing, a machine spindle, and a stator terminal box according to any one of claims 1-8:

the stator is arranged on the base, surrounds the rotor, and rotates around the motor spindle;

the stator junction box is arranged on the base and electrically connected with the stator.

10. The electric machine of claim 9, further comprising:

and the box seat sealing gasket is arranged between the base and a junction box seat in the stator junction box.

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