CN108365723A - Disc type permanent magnet synchronous electric motor - Google Patents

Abstract

The invention discloses a kind of disc type permanent magnet synchronous electric motors, including：Stator, engine base circle, rotor, drive end bearing bracket, rear end cap, rotary transformer, rotation become lid.The present invention uses axial magnetic circuit, shortens the axial length of motor, and the place that axial space is small and radial space is big is suitble to use.

Description

Disk type permanent magnet synchronous motor

technical field

The invention relates to a synchronous motor, in particular to a disc type permanent magnet synchronous motor.

Background technique

The existing motor magnetic circuits all adopt radial magnetic circuits, the stator windings of the motor are distributed on a circle according to certain rules, and the stator windings are fixed in the machine base. The permanent magnet rotor of the motor is a cylinder, and the permanent magnet rotor rotates in the stator to output mechanical energy and realize the conversion of electrical energy into mechanical energy.

Since the permanent magnet rotor and stator are relatively long in the axial direction, this motor structure is suitable for use in places where the axial space of the motor is large, but it cannot be used in places where the space is relatively small.

Contents of the invention

The technical problem solved by the present invention is to provide a disc-type permanent magnet synchronous motor, which uses an axial magnetic circuit, shortens the axial length of the motor, and is suitable for use in places where the axial space is small and the radial space is large.

The technical solution is as follows:

A disc type permanent magnet synchronous motor, comprising: a stator, a frame ring, a rotor, a front end cover, a rear end cover, a rotary transformer, and a resolver cover; the front end cover and the rear end cover are connected to both ends of the frame ring by bolts, The stator is fixed on the inner side of the rear end cover, and the rotor is installed between the front end cover and the rear end cover; the rear end cover has a rear end cover shaft hole at the axial center, and the rear end cover shaft hole is provided with a rear end cover bearing. Coil fixing grooves are provided on the inner wall outside the shaft hole of the end cover; the stator includes: stator coils, stator cores, stator cores are provided with wire slots arranged radially, the stator coils are installed in the wire slots, and the stator core It is fixed in the coil fixing groove; the rotor includes: a rotating shaft, a rotor iron core, and a rotor bracket; the rotor bracket is provided with a shaft connecting through hole at the shaft center, and the rotor is connected in the rotating shaft connecting through hole; Core groove; the rotor core is installed in the rotor core groove, and the permanent magnet is fixed on the outside of the rotor core; the front end cover has a front end cover shaft hole at the axis position, and a front end cover bearing is arranged in the front end cover shaft hole; the rotating shaft It is installed on the front end cover bearing and the rear end cover bearing; the resolver is installed on the inner side of the resolver cover, and the resolver cover is fixed on the front end cover.

Further, the stator also includes: a stator core pressure ring, a plurality of stator punches are fixed in the stator core pressure ring, the stator punches are provided with wire slots, and multiple wire slots are superimposed to form a wire slot; the stator core pressure ring is used The bolt is fixed in the coil fixing annular groove.

Further, the rotor core includes: a permanent magnet fixing plate, a permanent magnet, a rotor punch, and a rotor core ring; the bottom of the rotor core groove is provided with a rotor core fixing screw hole, and the rotor core ring is installed on the rotor core. In the groove, it is fixed on the fixed threaded hole of the rotor iron core by long screws; the rotor punch is installed in the pressure ring of the rotor iron core, and a partition is arranged between the two magnetic poles. The permanent magnet is installed on the outside of the rotor punch, and the permanent magnet is fixed. The plate is arranged outside the permanent magnet, and the permanent magnet fixing plate is connected to the pressure ring of the rotor iron core through screws.

Further, a keyway is provided in the connection through hole of the rotating shaft; an annular edge is arranged in the middle of the rotating shaft, and a first bearing connecting section and a power output section are arranged on the left side of the annular edge, and the power output section is located outside the first bearing connecting section; The right side is provided with a rotor connection section, a second bearing connection section, and a resolver connection section in turn. The rotor connection section is provided with a connection key, and a resolver connection thread hole is provided at the end of the resolver connection section; the rotor connection section is set on the shaft In the connecting through hole, the connecting key is inserted into the connecting keyway; the first bearing connecting section is set on the rear end cover bearing, and the power output section extends out of the rear end cover; the second bearing connecting section is set on the front end cover bearing, The resolver connection section is located on the inner side of the resolver cover; the resolver is fixed on the resolver connection threaded hole by screws.

Further, the resolver includes a transformer stator, the transformer stator is provided with an input winding and an output winding, the transformer stator is fixed on the front end cover by screws, and the transformer rotor core is fixed on the threaded hole connecting the resolver by screws; the resolver cover has an outlet hole, The lead-out wires of the input winding and output winding of the transformer stator extend out of the lead-out hole; the rear end cover is provided with a lead-out hole, and the lead-out wire of the stator coil protrudes from the lead-out hole.

Further, the coil fixing groove and the rotor core groove are annular grooves.

Further, the rotor support is provided with a support ring recess at the center of the shaft, the support press ring is installed at the support press ring recess, and the support press ring 37 has a press ring through hole in the middle.

Further, the shaft hole of the rear end cover is fixed with the inner bearing cover by bolts, and the rear end cover is provided with a flange on the outside.

Further, the number of stator coils, slots, and permanent magnets is determined by the number of stages of the motor, and multiple stator coils and permanent magnets are arranged radially.

Further, the stator coil adopts soft winding, multi-strand wires and embedded wires.

Technical effect of the present invention comprises:

1. The present invention uses an axial magnetic circuit, and the length of the iron core of the motor is in the radial direction, so the motor can be made into a disc shape with a large radial direction and a shortened axial direction, which is very suitable for a small axial distance and a radial Use in larger spaces.

In the present invention, the stator windings of the disc-type permanent magnet synchronous motor are fixed on the rear end cover, and the stator windings are distributed on the plane of the ring according to a certain rule in a radial shape, which minimizes the axial length of the stator. The rotor permanent magnet is fixed on the plane of the ring to form a ring-shaped disk, and the stator and the rotor form a plane rotating motor, which minimizes the axial length of the rotor. The magnetic circuit of the motor in the prior art is a radial magnetic circuit, but the magnetic circuit of the present invention is an axial magnetic circuit. This structure shortens the axial length of the motor and is suitable for use in places where the axial space is small and the radial space is large.

2. In the present invention, the permanent magnet of the permanent magnet rotor is pasted and fixed on the surface, which reduces the flux leakage coefficient of the permanent magnet, improves the utilization rate of the permanent magnet, and increases the energy storage of the air gap; the stator winding adopts a soft winding, which can realize multiple Stranded wires are wound around the embedding wires to reduce copper loss. The electromagnetic field is formed on a plane between the stator and the rotor for energy conversion, which shortens the axial length of the motor.

3. The invention has the advantages of fast start-up speed, good low-speed performance, strong overload capacity, stable high-speed operation, wide speed regulation range, wide high-efficiency working area, etc., and is suitable for making motors of tens of kilowatts.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is the structural representation of disc type permanent magnet synchronous motor in the present invention;

Fig. 2 is the assembly structure drawing of stator and rear end cover among the present invention;

Fig. 3 is a schematic structural view of the stator punch 13 in the present invention;

Fig. 4 is a schematic view of the groove structure of the centerline notch of the present invention;

Fig. 5 is the assembly drawing of rotor in the present invention;

Fig. 6 is an assembly view of the front end cover and the resolver in the present invention.

Detailed ways

The following description illustrates specific embodiments of the invention sufficiently to enable those skilled in the art to practice and reproduce it.

As shown in FIG. 1 , it is a structural schematic diagram of a disc-type permanent magnet synchronous motor in the present invention.

The structure of the disc permanent magnet synchronous motor includes: stator 1, frame ring 2, rotor 3, front end cover 4, rear end cover 5, resolver 6, resolver cover 7; front end cover 4, rear end cover 5 are connected by bolts At both ends of the frame ring 2, the stator 1 is fixed on the inner side of the rear end cover 5, the rotor 3 is fixed on the front end cover 4 and the rear end cover 5, and the resolver 6 is arranged at the end of the rotor, and the resolver cover 7 is fixed on the front end cover 4, and the resolver cover 7 is located on the outside of the resolver 6. The stator 1, the frame ring 2, the rotor 3, the front end cover 4, the rear end cover 5, the resolver 6, and the resolver cover 7 are coaxially installed.

As shown in FIG. 2 , it is an assembly structure diagram of the stator 1 and the rear end cover 5 in the present invention; as shown in FIG. 3 , it is a schematic structural diagram of the stator core in the present invention.

The rear end cover 5 has a rear end cover shaft hole 51 at the axial center, and a coil fixing groove is arranged on the inner wall outside the shaft hole. A rear end cover bearing 52 is arranged in the rear end cover shaft hole 51 , and the rear end cover bearing 52 is fixed with a bolt and a bearing inner cover 53 . The rear end cover 5 is provided with a flange 54 on the outside, and the flange 54 has a flange through hole, and is fixed to the outside through the flange 54 .

The stator 1 includes: a stator coil 11, a stator core ring 12, and a stator punch 13. A plurality of stator punches 13 are superimposed and fixed in the stator core ring 12 to form a stator core. The stator core is provided with radial The radially arranged wire slots, the stator coils 11 are installed in the wire slots to form a plane, and the stator core pressure ring 12 is fixed in the coil fixing groove by bolts. The number of stator coils 11 and wire slots is determined by the number of stages of the motor, and a plurality of stator coils 11 are arranged radially. The rear end cover 5 is provided with a lead hole, and the lead wire of the stator coil 11 protrudes from the lead hole.

As shown in FIG. 4 , it is a schematic view of the groove structure of the center line notch 131 of the present invention.

Each stator punch 13 is provided with a plurality of radially arranged wire slots 131 in the radial direction, and multiple wire slots 131 are stacked to form a wire slot. , The slot space is large, easy to insert wires, the slot wedge is firmly sealed, and the wire slots are arranged radially and radially, so that the wire slots are in the same plane, shortening the axial length of the motor stator core.

Stator coil 11 adopts soft winding, multi-strand wires are wound in parallel, and the ends of soft winding and embedded wires are easy to shape and the ends are relatively short. The skin effect of multi-strand wires and wrapped wires is small, thereby reducing copper loss.

As shown in FIG. 5 , it is an assembly diagram of the rotor 3 in the present invention.

The rotor 3 includes: a rotating shaft 31 , a permanent magnet fixing plate 32 , a permanent magnet 33 , a rotor punch 34 , a rotor iron core pressure ring 35 , a rotor bracket 36 , and a bracket pressure ring 37 .

The rotating shaft 31 is provided with an annular edge 313 in the middle, and the left side of the annular edge 313 is provided with a first bearing connection section 317 and a power output section 318, and the power output section 318 is positioned at the outside of the first bearing connection section 317; on the right side of the annular edge 313 A rotor connection section 311, a second bearing connection section 314, and a resolver connection section 315 are provided in sequence, and the rotor connection section 311 is provided with a connection key 312; the second bearing connection section 314 is located outside the rotor connection section 311, and the second bearing connection section 314 The outer side is a resolver connection section 315 , and a resolver connection screw hole 316 is provided at the end of the resolver connection section 315 . The bracket pressure ring 37 has a pressure ring through hole in the middle part.

The rotor bracket 36 is provided with a rotating shaft connection through hole 361 and a bracket pressure ring recess 363 at the shaft center, and a connecting keyway is arranged in the rotating shaft connecting through hole 361, and the rotor connecting section 311 is set in the rotating shaft connecting through hole 361, and the connecting key 312 is inserted Connected in the connecting keyway; the rotor bracket 36 is provided with a rotor core groove 364 inside, and the rotor core groove 364 is located outside the connecting through hole 361 of the rotating shaft; the bottom of the rotor core groove 364 is provided with a rotor core fixing screw hole 262 ; Bracket pressure ring 37 is installed in the bracket pressure ring concave platform 363, resolver connection threaded hole 315 is located in the pressure ring through hole 371.

The rotor core ring 35 is installed in the rotor core groove 364, and is fixed on the rotor core fixing threaded hole 262 by long screws; the rotor punch 34 is installed in the rotor core ring 35, and a spacer The permanent magnet 33 is installed on the outer side of the rotor punching plate 34, the permanent magnet fixing plate 32 is arranged on the outer side of the permanent magnet 33, and the permanent magnet fixing plate 32 is connected on the rotor iron core pressure ring 35 by screws.

The rotor core groove 364 is an annular groove, and the shape of the rotor core pressure ring 35 is annular. The permanent magnet 33 is a fan-shaped columnar body. According to the different pole pairs of the motor, the permanent magnet 33 is equally divided on the annular plane formed by the rotor punch 34, and fixed and bonded to the surface of the rotor punch 34 according to the polarity. The plane formed by the rotor punches 34 is radially arranged, and the permanent magnets 33 are separated by insulating partitions. The same thickness of the permanent magnet 33 specifications ensures that the permanent magnet 33 bonded and fixed on the surface of the rotor punch 34 forms an annular plane; the permanent magnet fixing plate 32 is bonded on the annular plane formed by the permanent magnet 33, and the magnetic steel fixing plate 32 And it is fixed together with the rotor bracket 36 to prevent the oxidation of the permanent magnet 33, increase the mechanical strength, reduce the flux leakage coefficient of the permanent magnet 33, increase the air gap energy storage, which is beneficial to increase the motor speed and shorten the axial length of the motor. The flux leakage coefficient of this structure is 10%-20%.

As shown in FIG. 6 , it is an assembly diagram of the front cover 4 and the resolver 6 in the present invention.

The front end cover 4 is provided with a front end cover shaft hole 41 at the axial center, and a front end cover bearing 42 is arranged in the front end cover shaft hole 41 .

The first bearing connecting section 317 of the rotating shaft 31 is sleeved on the rear end cover bearing 52, and the power output section 318 extends out of the rear end cover 5; the second bearing connecting section 314 at the other end of the rotating shaft 31 is sleeved on the front end cover bearing 42, The resolver connection section 315 is located inside the resolver cover 7 .

The resolver 6 is an induction micro-motor whose output voltage maintains a certain functional relationship with the rotor angle. It is a displacement sensor that converts angular displacement into an electrical signal, and it is also a computing element that can perform coordinate conversion and function operations. The resolver 6 is used to measure and output the rotational speed of the rotor 3 . The resolver 6 includes: a transformer stator (with an input winding and an output winding), the transformer stator is fixed on the front end cover 4 by screws, and the transformer rotor core is fixed on the resolver connecting threaded hole 316 by screws.

The edge of the resolver cover 7 is fixed on the front end cover 4 by screws, the resolver cover 7 is located outside the front end cover 4, the resolver cover 7 has an outlet hole 71, and the lead wire of the output winding of the resolver 6 extends out of the outlet hole 71 .

The above structure is suitable for motors with pole pairs of 3, 4, 5, 6, 8, etc., and for disc permanent magnet synchronous motors with various speeds, powers and voltages. According to the above motor structure, a variety of disc motors with power 20Kw~100Kw, axial length 60mm~120mm, radial diameter 500mm~1000mm, speed 1000rpm~8000rpm, voltage 480V~900V, etc. are designed, suitable for It is used in places where the exhaust air of various vehicles and the axial space are small.

It should be understood that the above description is only exemplary and explanatory, and cannot limit the present invention. Various modifications and changes have been made to the scope. The scope of the invention is limited only by the appended claims.

Claims (10)

1. a kind of disc type permanent magnet synchronous electric motor, which is characterized in that including：Stator, engine base circle, rotor, drive end bearing bracket, rear end cap, rotation Change depressor, rotation becomes lid；Drive end bearing bracket, rear end cap are bolted at the both ends of engine base circle, and stator is fixed on the interior of rear end cap Side, rotor are mounted between drive end bearing bracket, rear end cap；Rear end cap is provided with rear end cap axis hole, the setting of rear end cap axis hole in shaft core position There is bearing of rear end cover, coil fixed groove is provided on the inner wall on the outside of rear end cap axis hole；Stator includes：Stator coil is determined Sub- iron core, stator core are provided with the wire casing of radially radial arrangement, and stator coil is mounted in wire casing, and stator core is fixed In coil fixed groove；Rotor includes：Shaft, rotor core, rotor field spider；Rotor field spider is provided with shaft company at axle center Hole is connected, rotor is connected in shaft connection through-hole；Rotor field spider is provided with rotor core groove in inside；Rotor core is installed In rotor core groove, permanent magnet is fixed on the outside of rotor core；Drive end bearing bracket is provided with drive end bearing bracket axis hole, front end in shaft core position Drive end bearing bracket bearing is provided in lid axis hole；Shaft is mounted on drive end bearing bracket bearing and bearing of rear end cover；Rotary transformer is mounted on Rotation becomes the inside of lid, and rotation becomes lid and is fixed on drive end bearing bracket.

2. disc type permanent magnet synchronous electric motor as described in claim 1, which is characterized in that stator further includes：Stator core trim ring, it is multiple Stator punching is fixed in stator core trim ring, and stator punching is provided with notches for wire, and multiple notches for wire are superimposed to form wire casing；Stator Core flange profit is fixed by bolts in coil stationary annular groove.

3. disc type permanent magnet synchronous electric motor as described in claim 1, which is characterized in that rotor core includes：Permanent magnet retaining plate, forever Magnet, rotor punching, rotor core pressing ring；Rotor core bottom portion of groove is provided with rotor core fixing screwed hole, rotor core Trim ring is mounted in rotor core groove, is fixed in rotor core fixing screwed hole by long spiro nail；Rotor punching is mounted on In rotor core pressing ring, partition board is provided between two magnetic poles, permanent magnet is mounted on the outside of rotor punching, permanent magnet retaining plate setting On the outside of permanent magnet, permanent magnet retaining plate is connected by screw on rotor core pressing ring.

4. disc type permanent magnet synchronous electric motor as described in claim 1, which is characterized in that be provided with keyway in shaft connection through-hole；Turn Axis is provided with annular edge at middle part, and first bearing linkage section and power output section, power output section are provided on the left of annular edge In the outside of first bearing linkage section；Rotor linkage section, second bearing linkage section, rotation change are disposed on the right side of annular edge Depressor linkage section, rotor linkage section are provided with connecting key, have rotary transformer company in the end set of rotary transformer linkage section Connect threaded hole；Rotor linkage section is sleeved in shaft connection through-hole, and connecting key is plugged in connection keyway；First bearing linkage section It is sleeved on bearing of rear end cover, power output section stretches out the outside of rear end cap；Second bearing linkage section is sleeved on drive end bearing bracket bearing On, rotary transformer linkage section is located at the inside that rotation becomes lid；Rotary transformer is fixed on rotary transformer using screw and connects spiral shell On pit.

5. disc type permanent magnet synchronous electric motor as claimed in claim 4, which is characterized in that rotary transformer includes resolver stator, is become Depressor stator is provided with input winding, output winding, and resolver stator is fixed on using screw on drive end bearing bracket, transformer rotor iron The heart is fixed on using screw in rotary transformer connection screw thread hole；Rotation, which becomes to cover, is provided with outlet hole, the input winding of resolver stator, It exports winding leading-out wire and stretches out outlet hole；Rear end cap is provided with fairlead, and the lead-out wire of stator coil is stretched out from fairlead.

6. disc type permanent magnet synchronous electric motor as described in claim 1, which is characterized in that coil fixed groove and rotor core groove are Annular groove.

7. disc type permanent magnet synchronous electric motor as described in claim 1, which is characterized in that rotor field spider is provided with holder pressure at axle center Concave station is enclosed, holder trim ring is mounted at holder trim ring concave station, and holder trim ring 37 is provided with trim ring through-hole at middle part.

8. disc type permanent magnet synchronous electric motor as described in claim 1, which is characterized in that rear end cap axis hole utilizes bolt and internal bearing cover Fixed, rear end cap is provided with flange on the outside.

9. disc type permanent magnet synchronous electric motor as described in claim 1, which is characterized in that stator coil, wire casing, the quantity of permanent magnet are logical The grade logarithm of motor is crossed to determine, multiple stator coils and permanent magnet are arranged radially.

10. disc type permanent magnet synchronous electric motor as described in claim 1, which is characterized in that stator coil uses mush winding, stranded conductor And around embedding.