DE102015217702A1 - engine - Google Patents

Abstract

The motor according to the present disclosure includes a rotary unit, a fixed unit disposed around the rotary unit, and a bearing mechanism that rotatably supports the rotary unit relative to the fixed unit. The rotary unit has a plurality of magnets. The fixed unit includes a stator disposed around the rotary unit and a cover that is electrically conductive and covers an upper surface of the stator, and the stator includes a stator core including a plurality of teeth and a core back, and a coil wound around the stator core via an insulator. The cover has openings at at least a portion of a circumferential interval between adjacent teeth when viewed from above, and the cover is connected to a ground potential.

Description

The present disclosure relates to an electric motor.

From the past, such a type of engine is known, in which a structure for discharging heat from inside the engine, particularly a stator or a circuit board, by providing an air inlet hole and an air outlet hole on a motor housing and generating a cooling air flow by an air pressure difference provided between the area around the air inlet hole and the area around the air outlet hole.

For example, in the engine used in the U.S. Patent No. 7,977,831 discloses a motor housing on air holes. Further, due to air pressure differences between the air intake holes provided at the bottom of the engine and openings in an air gap, air flows into the engine and releases the heat inside the engine through the air gap.

[Patent Literature 1] - U.S. Patent No. 7,977,831

At present, due to the electrification of automobiles, numerous electronic components are mounted on a vehicle. Accordingly, the emission limits for EMI (electromagnetic interference) for automobile parts have been tightened to prevent malfunction of the electronic component. In addition, when air holes are provided on the motor housing, the electromagnetic waves generated particularly from the coil end of the stator can be directly emitted through the gap to the outside of the motor housing and cause malfunction of other electronic components.

One of the main objects of the present disclosure is to provide an engine in which the EMI emission generated by the engine is reduced while maintaining the radiation behavior of the engine.

This object is achieved by an engine according to claim 1.

A first embodiment of the present disclosure is a motor that includes a rotary unit 3 , a fixed unit 2 around the turntable 3 is arranged around, and a bearing mechanism 4 comprising, which rotatably supports the rotary unit relative to the fixed unit. The turntable 3 has a plurality of magnets 32 on. The fixed unit includes a stator disposed around the rotary unit and a cover that is electrically conductive and covers an upper surface of the stator, the stator including a stator core including a plurality of teeth and a core back, and a stator core Coil which is wound around the stator core via an insulator. In plan view, the cover has openings formed at at least one of circumferential intervals between adjacent teeth, and the opening is connected to a ground potential.

According to the present disclosure, the EMI emission generated by the engine can be reduced while maintaining the radiating performance of the engine.

Preferred embodiments of the present invention will be explained below with reference to the accompanying drawings. Show it:

1 a plan view of an engine according to the first embodiment;

2 a vertical sectional view of the engine;

3 a plan view of a rotary unit;

4 a bottom view of the turntable;

5 a vertical sectional view of the rotary unit;

6 a vertical sectional view of the rotary unit;

7 a bottom view of the rotor core and the magnets;

8th a bottom view of the rotor core;

9 a vertical sectional view of the rotor core;

10 an enlarged plan view of the rotor core and the magnets; and

11 a vertical sectional view of a rotary unit according to another embodiment;

12 (a) a plan view of the stator;

12 (b) a plan view of the engine, in which the cover and the coil are shown in perspective;

13 (a) a plan view of openings in another form, which are provided on the cover;

13 (b) a plan view of openings in another form, which are provided on the cover; and

13 (c) a plan view of openings in another form, which are provided on the cover.

Herein is the upper side, which is in 2 is shown in the direction of the center axis J1 of the engine 1 simply referred to as the "upper side" and the lower side thereof is simply referred to as the "lower side". In addition, the upper and lower directions do not necessarily refer to the positional relationships or directions when the engine is actually assembled and installed in equipment. In addition, a direction parallel to the center axis J1 is simply referred to as "axial direction", the radial direction centered on the center axis J1 is simply referred to as "radial direction", and the circumferential direction centered on center axis J1 is simply referred to as "circumferential direction".

1 FIG. 10 is a plan view illustrating a motor according to an exemplary first embodiment of the present disclosure. FIG. 2 is a vertical sectional view of the engine 1 , A parallel diagonal line is not included in the section details. The motor 1 is a brushless inner rotor type motor. The motor 1 includes a fixed unit 2 , a turntable 3 , a bearing mechanism 4 and a circuit board 5 , The bearing mechanism 4 carries the turntable 3 in relation to the fixed unit 2 with its center on the center axis J1 of the engine 1 rotatable. An impeller shell of an impeller can be attached to the turntable 3 to be appropriate. The motor 1 For example, it is used in a blower to cool the coolant of a vehicle.

The fixed unit 2 includes a housing 21 , a stator 22 and a wave 23 , The stator 22 is about the turntable 3 arranged around. The fixed unit 2 is about the turntable 3 arranged around. The housing 21 includes a base component 211 and a cover 212 , The basic component 211 has a substantially plate-like shape which is perpendicular to the central axis J1. The wave 23 protrudes upward, with the lower end on the base member 211 is fixed. The wave 23 is arranged so that its center lies on the central axis J1. The cover 212 has a substantially cylindrical shape and may be attached to the base member 211 to be appropriate. openings 521 are in the middle of the cover 212 intended. The openings 521 put the turntable 3 free.

The stator 22 includes a stator core 223 , an insulator 221 and a coil 222 , The stator core 223 includes a plurality of teeth 531 and a nuclear back 532 , The core back 532 has a ring shape with its center on the central axis J1. Each of the teeth 531 extends radially from the back of the core 531 inside to the turntable 3 , In the stator core 223 Electromagnetic steel plates are laminated. The teeth 531 are through the insulator 221 covered. The sink 222 is installed so that it is the isolator 221 surrounds.

The circuit board 5 is on a lower surface of the central portion of the base member 211 appropriate. The circuit board 5 controls the power supply for the fixed unit 2 provided. Accordingly, the rotational speed of the rotary unit 3 to be controlled. A lid component 213 is at a lower portion of the base member 211 appropriate. The lid component 213 covers a lower surface of the circuit board 5 , The basic component 211 includes a lead 522 projecting in a lateral direction. A plurality of wires 523 connected to the circuit board 5 are connected, is out of the lead 522 pulled out.

The bearing mechanism 4 has two bearings 41 on. In this embodiment, the bearing 41 a ball bearing. The warehouse 41 can have a different structure. The two camps 41 are between the shaft 23 and the turntable 3 intended.

The turntable 3 includes a rotor core 31 , a plurality of magnets 32 and a resin portion 33 , The magnet 32 is a permanent magnet. The rotor core 31 is in the radial direction on an inner side of the stator 22 arranged. The outer peripheral surface of the rotor core 31 is adjacent to the inner peripheral surface of the stator 22 ,

3 is a plan view of the turntable 3 , 4 is a bottom view of the turntable 3 , 5 is a vertical sectional view of the turntable 3 , 6 is a vertical sectional view of the turntable 3 from a different position than 5 considered. 7 is a bottom view of the rotor core 31 and the magnet 32 , 8th is a bottom view of the rotor core 31 , 9 is a vertical sectional view of the rotor core 31 , In the rotor core 31 Electromagnetic steel plates are laminated axially.

As in 8th shown includes the rotor core 31 an outer core section 311 an inner core section 312 and a plurality of connecting portions 313 , The inner core section 312 has a ring shape. The outer core section 311 includes a plurality of outer core elements 541 , The majority of outer core elements 541 is arranged in the circumferential direction. each Outer core element 541 has a substantially fan-like shape. The outer core section 311 is located on a radially outer side of the inner core portion 312 , Each connection section 313 connects an outer core element 541 and the inner core portion 312 in the radial direction. The connecting section 313 extends in the radial direction and connects the circumferential center of the radially inner portion of the outer core member 541 with the outer peripheral surface of the inner core portion 312 , The outer core element 541 , the inner core section 312 and the connecting section 313 form a continuously connected component.

9 is a vertical sectional view of the rotor core 31 with a section in the circumferential center of the outer core element 541 , As in 8th and 9 is shown, the outer core element 541 a through hole 545 which penetrates in the axial direction. The inner peripheral portion of the rotor core 31 that is, the inner peripheral portion of the inner core portion 312 , includes a core section of large diameter 551 and a small diameter core portion 552 , The core section with a large diameter 551 is at an axially lower side of the core portion with a small diameter 552 arranged. The inner diameter of the large diameter core section 551 is larger than the inner diameter of the small-diameter core portion 552 ,

As in 7 shown are magnets 32 between the outer core elements 541 arranged. Each outer core element 541 is a section between any two of the plurality of magnets 32 in the outer core section 311 is arranged. The magnets 32 are arranged in the circumferential direction at identical intervals. The inner core section 312 is on a radially inner side of the plurality of magnets 32 arranged. The rotor core 31 Hold the magnets 32 , In the cross section perpendicular to the central axis J1, each magnet has 32 a pair of long sides 611 and a couple of short pages 612 on. That is, in plan view, the radial length of each of the plurality of magnets is longer than the circumferential length thereof. A midline 613 between the pair of long sides 611 passes through the central axis J1. This means that the centerlines 613 of all magnets 32 intersect on the central axis J1. The motor 1 is a spoke-type IPM engine.

The pair of long sides 611 is magnetized into opposite poles. In a neighboring pair of magnets 32 identical poles face each other in the circumferential direction. Accordingly, some of the magnetic field lines are from the long sides 611 , which face each other, over the outer peripheral surface of the outer core member 541 outside the rotor core 31 directed pass through the outer peripheral surfaces of the outer core elements 541 which are adjacent, on both sides in the rotor core 31 and are led to the other pole. The outer core element 541 acts as a magnetic pole with respect to the stator 22 ,

10 is an enlarged plan view of the rotor core 31 and the magnet 32 , As already described, the outer core portion is 311 and the inner core portion 312 by a plurality of connecting sections 313 connected. A river barrier 546 is between the outer core element 541 and the inner core portion 312 and on both sides of the connection section 313 provided in the circumferential direction. The river barrier 546 is a room where neither the rotor core 31 still the magnet 32 is present. In other words, the outer core section 311 is on a radially outer side of the flow barrier 546 intended. The inner core section 312 is on a radially inner side of the flow barrier 546 intended. The connecting section 313 is provided between a pair of adjacent magnets and is between a pair of flux barriers 546 arranged. In the present embodiment, a part of the resin portion is located 33 within the river barrier 546 in front. Accordingly, the resin portion covers 33 the area around the connecting section 313 around and prevents the flow of magnetic flux, whereby the strength of the connecting portion 313 is improved and deformation can be prevented.

The resin is not necessarily in the flow barrier 546 before, ie in the rotor core 31 , It is sufficient if the river barrier 546 is provided to a region where a magnetic resistance is greater than other portions. For example, in the river barrier 546 Air or other material.

The inner core section 312 includes a plurality of protrusions 547 projecting outward in the radial direction from the outer peripheral surface. Every lead 547 is between two connection sections 313 arranged. The short side 612 of the magnet 32 is in contact with the projection in the radial direction 547 , The long side 611 of the magnet 32 is in contact with the outer core member in the circumferential direction 541 , Every river barrier 546 is through an outer peripheral surface of an inner core portion 312 , Connecting sections 313 , a short page 612 a magnet and a projection 547 Are defined. The short side 612 is in contact with two river barriers 546 ,

By providing the river barrier 546 can prevent the magnetic flux in Direction of a radially inner side controls, whereby the magnetic flux is effectively from the magnet 32 in the direction of the outer core element 541 can be performed. Consequently, a large amount of magnetic flux may be directed toward the radially outer side of the outer core member 541 be derived, reducing the output of the engine 1 can be improved without changing its size. In other words, it is possible to prevent a reduction in output and miniaturization of the motor 1 to achieve.

To the inflow of the magnetic flux in the inner core section 312 To prevent it, it is preferable that the connecting section 313 is thin. With such a feature, the connecting portion 313 readily be magnetically saturated and block the magnetic flux. Preferably, the radial length of the connecting portion 313 longer than the circumferential width of the same.

5 is a vertical sectional view of the turntable 3 which includes the central axis J1 and which is defined by a surface passing through the circumferential center of the outer core element 541 runs. 6 is a vertical sectional view of the turntable 3 which includes the central axis J1 and which is defined by a surface passing through the center of circumference of the magnet 32 runs. The majority of magnets 32 and the rotor core 31 are through the resin section 33 covered. The resin section 33 includes an upper resin portion 331 a lower resin portion 332 and an inner peripheral resin portion 333 ,

The upper resin section 331 covers at least part of the upper surface of the rotor core 31 and at least part of the upper surface of each magnet 32 , The lower resin section 332 covers at least a part of the lower surface of the rotor core 31 and at least part of the lower surface of each magnet 32 , With this feature, the rotor core 31 and the magnet 32 through the resin section 33 integrated in the axial direction. Preferably, the resin portion covers 33 at least part of the radially outer side surface of the magnet 32 and holds the magnet 32 in the radial direction. Of course, also holding the magnet 32 in relation to the rotor core 31 be achieved with different structures.

The inner peripheral resin section 333 covers the inner peripheral surface of the rotor core 31 and has a ring shape. It is not absolutely necessary to make the boundary between the upper resin section 331 , the lower resin section 332 and the inner circumference resin portion 333 to define strictly. The upper resin 331 and the lower resin portion 332 are with the inner circumference resin section 333 connected and form a continuously connected component. The upper resin section 331 , the lower resin portion 332 and the inner circumference resin portion 333 may not be connected.

As in 3 . 5 and 6 is shown, the upper resin portion includes 331 a plurality of inlet holes 561 , a plurality of upper core carrier marks 562 , a plurality of upper magnet carrier marks 563 and an impeller attachment portion 564 , The position of the inlet hole 561 corresponds to the position of the inlet from the injection. The circumferential position of the inlet holes 561 is identical to the circumferential position of the outer core elements 541 , The number of inlet holes 561 is identical to the number of outer core elements 541 , The inlet hole 561 is at a radially inner side portion of the outer core member 541 educated.

The upper core carrier mark 562 is a mark of a pen that is the outer core element 541 from the upper side during injection. The circumferential position of the upper core carrier marks 562 is identical to the circumferential position of the outer core elements 541 , The number of upper core carrier marks 562 is identical to the number of outer core elements 541 , The upper core carrier mark 562 overlaps the radially inner side region of the through-hole 545 of the outer core element 541 , The inside of the through hole 545 may be filled with resin or not filled with resin. In the upper core carrier mark 562 lies a part of the upper surface of the rotor core 31 free.

The upper magnet carrier mark 563 is a brand of a pen that holds the magnet 32 from the upper side while performing the injection. The circumferential position of the upper magnet carrier marks 563 is identical to the circumferential position of the magnets 32 , The number of upper magnetic carrier marks 563 is identical to the number of magnets 32 , The radial position of the upper magnet carrier mark 563 is substantially a center of the magnet in the radial direction 32 , At the upper magnet carrier mark 563 lies a part of the upper surface of the magnet 32 free.

The impeller attachment portion 564 is an area where an impeller shell on the turntable 3 is appropriate. The circumferential position of the impeller mounting portions 564 is identical to the circumferential position of the outer core elements 541 , In the present embodiment, the number of impeller mounting portions is 564 in about one half of the number of outer core elements 541 , The circumferential position of the plurality of impeller mounting portions 564 is identical to every other circumferential position of the outer core elements 541 , The impeller attachment portion 564 overlaps the radially outer side region of the outer core element 541 ,

As in 4 . 5 and 6 is shown, the lower resin portion includes 332 a plurality of first lower core carrier marks 566 , a plurality of second lower core carrier marks 567 and a plurality of lower magnetic carrier marks 568 , The first lower core carrier brand 566 is a mark of a pin that is at least one direction of the connecting portion 313 and the inner core portion 312 from the bottom during injection. The circumferential position of the first lower core carrier marks 566 is identical to the circumferential position of the outer core elements 541 ie that of the connection section 313 , The number of first lower core carrier marks 566 is about one half of the number of outer core elements 541 , The circumferential position of the plurality of first lower core carrier marks 566 is identical to every other circumferential position of the outer core elements 541 ,

At the first lower core carrier mark 566 lies a part of the lower surface of the rotor core 31 free. The pen of the form, that of the first lower core carrier mark 566 can only match the inner core section 312 or only the connecting section 313 wear. This means that the first lower core carrier brand 566 on a radially inner side to the outer core element 541 is arranged. In the present embodiment, the pin carries at least a part of the inner core portion 312 and at least a part of the connection portion 313 , Accordingly, from the first lower core carrier mark 566 a part of the inner core portion 312 and a part of the connection portion 313 free.

Including the river barrier 546 Resin is around the connection section 313 around. However, it is not in the first lower core brand 566 in front. For this reason, the fact of whether the connecting section 313 is deformed during injection or not, readily visually through the first lower core carrier mark 566 to be watched. Accordingly, before actually electrical power to the motor 1 is delivered, a problem caused by the deformation of the rotor core 31 will be found.

With the exception that the second lower core carrier mark 567 at the lower resin portion 332 is provided, their number, circumferential and radial position are identical to those of the upper core carrier mark 562 , In every second lower core brand 567 lies a part of the lower surface of the rotor core 31 in the outer core section 311 free.

The lower magnet carrier mark 568 is a brand of a pen that holds the magnet 32 during injection from the lower side carries. The circumferential position of the lower magnet carrier marks 568 is identical to the circumferential position of the magnets 32 , The number of lower magnetic carrier marks 568 is identical to the number of magnets 32 , The lower magnet carrier mark 568 has a rectangular shape that is smaller than the magnet 32 , At the lower magnet carrier mark 568 lies part of the lower surface of the magnet 32 free.

By providing the first lower core carrier mark 566 on a radially inner side than the outer core element 541 ie by wearing the rotor core 31 on a radially inner side than the outer core element 541 inside the mold, can the deformation of a rigid and small connecting section 313 even if the resin is injected from an upper side down to the mold. Consequently, an irregularity in the quality of the engine 1 be reduced. The "prevention of deformation" of the connecting portion 313 in the present embodiment includes a "reduction of deformation". The support for the rotor 31 in the first lower core carrier mark 566 is suitable if the radius of the rotor core 31 is greater than the axial thickness of the rotor 31 and when the connecting portion 313 is easy to deform, as in 9 is shown.

In this embodiment, each of the plurality of first lower core carrier marks overlaps 566 at least part of any of the connecting sections 313 , In this case, as compared with the case where the first lower core carrier mark 566 the inner core section 312 overlaps, the first lower core carrier mark 566 positioned on a radially outer side. Consequently, the profile accuracy of the inner peripheral surface of the lower resin portion 332 be improved. The improvement of the profile accuracy of the inner peripheral surface of the lower resin portion 332 is preferable when the bearing 41 is held on the inner circumferential surface, as described in detail below.

The majority of inlet holes 561 is provided in the radial direction and between the plurality of first lower core carrier marks 566 and the plurality of second lower core carrier marks 567 arranged. Accordingly, it is possible to carry out injections through the first lower core carrier mark 566 and the second lower core carrier mark 567 the rotor core 31 Stable to absorb the pressure of the flowing resin.

As described above, the circumferential center position is each inlet hole 561 and every first lower core tag 566 identical to the circumferential center position of the outer core element 541 , In other words, overlaps, as in 7 is shown, the circumferential center position of each inlet hole 561 and every first lower core tag 566 in the axial direction, the center line 614 pointing in the radial direction direction about the circumferential center position of any one of the connecting portions 313 , Accordingly, even when injecting the rotor core 31 be worn stably. Wearing the rotor core 31 can also by arranging the second lower core carrier mark 567 on the middle line 614 be stabilized. However, when the plurality of second lower core carrier marks 567 corresponding to a single outer core element 541 is provided, it is not necessary that the second lower core carrier mark 567 on the middle line 614 is arranged.

As in 5 is shown, the resin section 33 a cylindrical shape with its center on the central axis J1 and includes another cylindrically shaped resin portion 334 projecting upwards from the rotor core 31 path. The resin section 33 includes another cylindrically shaped resin portion 335 which is the outer periphery of the cylindrical resin portion 334 covered. Hereinafter, the cylindrical resin portion will be described 334 referred to as "inner cylindrical resin portion" and the cylindrical resin portion 335 as "outer cylindrical resin section". As in 3 and 6 is shown, the resin portion includes 33 Further, a plurality of web portions 336 that the inner cylindrical resin section 334 and the outer cylindrical resin portion 335 connect in the radial direction.

As in 2 is shown, the inner cylindrical resin portion functions 334 as a bearing support portion for holding the upper bearing 41 in the inner peripheral surface. The warehouse 41 becomes in a press-fit state exactly in the inner cylindrical resin portion 334 held. By providing the inner cylindrical resin portion 334 can the warehouse 41 even if the rotor core 31 is thin, with a greater positional accuracy held by the resin. By providing the outer cylindrical resin portion 335 and the bridge section 336 For example, the rigidity of the inner circumferential surface of the inner cylindrical resin portion 334 be improved and also the holding of the warehouse 41 the upper side can be improved. In particular, in the space between the inner cylindrical resin portion 334 and the outer cylindrical resin portion 335 at which the bridge section 336 is provided, a decrease in the inner diameter accuracy of the inner cylindrical resin portion 334 , which is caused by the contraction of the resin can be prevented.

The impeller attachment portion 564 is around the inner cylindrical resin portion 334 and the outer cylindrical resin portion 335 provided around. In the center of the impeller shell, a hole portion or a concave portion for inserting the cylindrical resin portions is provided. Accordingly, the height of the fan can be pressed.

As with reference to 9 has been described, includes the inner peripheral portion of the rotor core 31 a core section of large diameter 551 and a small diameter core portion 552 , As in 5 is shown, the inner circumference resin portion includes 333 a resin section of large diameter 571 , a small-diameter resin portion, and a stepped resin portion 573 , The resin section with a large diameter 571 covers the inner peripheral surface of the large-diameter core portion 551 , The resin section 572 small-diameter covers the inner peripheral surface of the small-diameter core portion 552 , The resin section with a large diameter 571 and the resin portion of small diameter 572 each have a substantially cylindrical shape with the center on the central axis J1. The stepped resin section 573 has a ring shape that widens outward perpendicular to the central axis J1, and connects the upper end of the large-diameter resin portion 571 and the lower end of the small diameter portion 572 in the radial direction.

The inner cylindrical resin portion 334 is on the upper side of the resin portion of small diameter 572 arranged. The inner diameter of the resin portion of small diameter 572 is smaller than the inner diameter of the inner cylindrical resin portion 334 and a stepped portion is between the small-diameter resin portion 572 and the inner cylindrical resin portion 334 intended. As in 2 is shown, the lower bearing 41 on the inner peripheral surface of the large-diameter resin portion 571 held. The upper end of the camp 41 is in contact with the lower surface of the stepped resin portion 573 , Accordingly, the axial position of the bearing 41 be determined without further ado. The warehouse 41 becomes in a direction perpendicular to the central axis J1 in a press-fitting state in the resin large-diameter portion 571 held. Because the inner circumference of the rotor core 31 is covered by resin, falling apart of burrs of the laminated steel plates is prevented. Consequently, an increase in noise or a shortening of the life span, for example caused by the falling burr in the camp 41 get prevented.

Also, by arranging the upper end of the lower bearing 41 at an upper position from the lower surface of the rotor core 31 will that camp 41 on the inside of the rotor core 31 kept and the height of the engine 1 can be pushed deeper and a reduction in weight of the engine can be implemented. In the event that the warehouse 41 directly on the rotor core 31 is held, it is to have a high-precision inner diameter of the rotor core 31 To maintain, it is necessary to increase the grinding number of the mold, which drills holes in the steel plate. By holding the bearing on the resin portion 33 For example, in the direction perpendicular to the center axis J1, the high accuracy of resin molding can be achieved 41 can be held with high accuracy and, since the molding temperature of the resin is low, less abrasion occurs to the mold, therefore, grinding of the mold in the first place becomes unnecessary, whereby it is possible to prolong the life of the mold.

As in 2 is shown is the circuit board 5 arranged perpendicular to the central axis J1. The lower camp 41 becomes on the inner peripheral resin portion 333 held and also the lower end of the shaft 23 ie the end portion of the side of the lower bearing 41 the wave 23 , by the fixed unit 2 carried. Accordingly, it becomes possible the height of the engine 1 to suppress and the lower end of the shaft 23 and the circuit board 5 to arrange in the axial direction. Consequently, it is no longer necessary to have a through hole on the circuit board 5 for penetrating the shaft 23 provide, and the circuit board 5 can be made smaller in the radial direction. In addition, miniaturization, weight reduction and low manufacturing cost of the engine 1 be achieved.

As in 1 and 2 is shown is the upper surface of the stator 22 through the cover 212 covered. The cover 212 includes a plurality of openings 214 extending in the circumferential direction above the stator 22 are arranged. The cover 212 is formed of a conductive metal. These openings 214 could be a through hole and could be a notch from the central opening 512 is cut to a radially outer side. A ventilation opening is on the base component 211 provided and an air flow is determined by the difference of the air pressure around the ventilation opening and the openings 214 generated around. This air flow dissipates the heat from the circuit board 5 or the stator 22 is generated, these being through the openings 214 exit. A plurality of ribs may be provided around the ventilation opening to enhance the radiation effect. Meanwhile, the cover absorbs 212 the electromagnetic waves coming from the coil end of the stator 22 In addition, by being connected to ground potential, the cover prevents the EMI from being emitted outside the motor.

For the function of preventing EMI are the openings 214 preferably small. If the openings 214 however, made small, the heat radiation is deteriorated. So is in the engine 1 the circumferential center of the openings 214 between a coil 222 and another coil 222 arranged so that an EMI can be reduced and a heat radiation can be ensured. Such a reduction of the EM 'is particularly suitable for an engine for vehicles. In addition, by arranging the openings 214 between the coils 222 an air flow caused by the rotation of the rotary unit 3 is generated, readily at the position of the openings 214 Heat radiation can occur even with a small opening 214 to be obtained.

12 (b) is a top view of the engine, the teeth 531 in the drawing by perspective viewing of the cover 212 and the coil 222 represents a clear understanding of the positional relationship between the openings 214 and the teeth 531 attached to the cover 212 are provided. As in 12 (b) are shown in plan view, the openings 214 the cover 212 at an upper portion of a circumferential interval between the teeth 224 of the stator 22 arranged such that the position of the openings in plan view not the position of the teeth ( 531 ) overlaps. Furthermore, the EMI reduction effect is observed even when the coil 222 through the openings 214 however, a higher reduction effect is seen when the coil 222 not in top view through the openings 214 is visible.

As described above, the openings are 214 preferably of large size to ensure the heat radiating function. Accordingly, the openings 214 Preferably, a shape whose circumferential width gradually increases toward a radially outer side. At the in 1 Example shown are in a range between an opening 214 and the adjacent opening 214 the same two pages 215 in contact with both openings 214 stand, parallel and directed in the direction of a substantially radial direction. Accordingly, it is easy to prevent other objects from contacting the coil 222 produce. As in 13 (a) and 13 (b) shown can be the openings 214 be formed of a plurality of groups of openings and, as in 13 (c) shown can be the openings 214 a notch, which consists of an inner peripheral edge, the middle opening 521 forms, is cut toward a radially outer side and with the openings 214 connected is.

Preferably, the openings 214 at an upper section of the intervals between all tooth 224 arranged. However, you can only at an upper portion of the intervals between some of the teeth 244 be arranged.

11 represents another example of the turntable 3 represents and corresponds 5 , The diameter of the inner peripheral portion of the rotor core 31 is constant. Meanwhile, the inner peripheral resin section 333 , as in 5 shown a resin section of large diameter 571 a small diameter resin portion 572 and a stepped resin portion 573 on. The resin section with a large diameter 571 covers the lower portion of the inner peripheral surface of the rotor core 31 and the resin portion of small diameter 572 covers the middle and upper portions of the inner circumferential surface of the rotor core 31 , The inner diameter of the resin portion of small diameter 572 is smaller than the inner diameter of the resin portion of large diameter 571 , The stepped resin section 573 connects the large diameter resin section 571 and the resin portion of small diameter 572 , The lower camp 41 becomes on the resin portion of large diameter 571 held. The upper end of the camp 41 is in contact with the lower surface of the stepped resin portion 573 ,

In the axial direction can, as the inner diameter of the rotor core 31 is constant, the manufacturing cost of the rotor core 31 be reduced. Meanwhile, by installing the resin large-diameter portion 571 , the resin portion of small diameter 572 and the stepped resin portion 573 the position of the lower bearing 41 be arranged precisely.

A variety of modifications may be made to the engine 1 be made.

In the case 21 can the basic component 211 and the cover 212 be a single component. In contrast, the housing can 21 a combination of three or more elements. At the rotor core 31 it is not necessary that the width of the connecting section 313 is constant. The connecting section 313 is at a radially inner side than the magnet 32 arranged and has a width which is less than or equal to the minimum circumferential width of the outer core element 541 is. The length of the connection section 313 can be shorter. In the plan view, the connecting portion 313 a restricted section between the outer core element 541 and the inner core portion 312 , It is not necessary that the magnet 32 when viewed in plan view has a rectangular shape.

The number of poles of the turntable 3 and the fixed unit 2 can be modified several times. A variety of methods can be used to fix the magnet 32 on the rotor 31 be used. For example, an adhesive may be used in common, and a part of the laminated steel plate may be the position of the magnet 32 fix.

The inlet hole 561 and the first lower core carrier mark 566 may be partially overlapping. In such a case, the connecting portion takes 313 when injecting a strong force from the resin. Deforming the connection section 313 however, at the first lower core carrier mark 566 be prevented.

The shape of each carrier mark on the resin section 33 is formed, is not limited to a hole shape. It may, for example, be a notch-like shape provided at the edge, such as e.g. B. the outer circumference or the inner circumference of the rotor core 31 , It is not necessary that the inner circumference resin portion 333 the entire inner peripheral surface of the rotor core 31 covered. It is sufficient if at least a part of the inner circumferential surface is covered. The resin section 333 can with only one of the upper resin section 331 and the lower resin portion 332 be connected.

The upper bearing 41 and the lower camp 41 can be exchanged alternately. That is, the inner cylindrical resin portion 334 can with the lower resin section 332 be connected and thereby the resin portion of large diameter 571 with the upper resin section 331 be connected. This structure is essentially identical to that in 2 structure, the only difference being that the upper bearing 41 and the lower camp 41 are not interchanged and the upper resin section 331 and the lower resin portion 332 are exchanged alternately. As long as the inlet hole 561 and the first lower core carrier mark 566 on an opposite side of the rotor core 31 present, the position or shape of the carrier mark can be modified variously.

In the engine 1 is the wave 23 at the fixed unit 2 fixed. However, a rotary shaft structure can also be used. In this case, for example, the shaft would be fixed to the inner peripheral resin portion. In addition, in this case, as described above, since the accuracy of the inner diameter of the inner peripheral resin portion can be easily improved, the manufacturing cost of the rotary unit can be improved 3 be reduced. Regardless of whether the shaft is provided in a fixed feature or in a rotational feature, by providing the inner circumference resin portion Bearing mechanism (in the case that the bearing mechanism includes a plurality of bearings, at least a part of the bearing mechanism) or the shaft are held precisely on the inner peripheral resin portion.

The structure of holding the bearing or the shaft on the inner peripheral resin portion may be the technique of installing the carrier mark in a radially inner side than the outer core member 541 be separated and used in a variety of engine types. Similarly, the technique of installing openings 214 for ventilation for the cover 212 from installing the carrier mark in a radially inner side to the outer core element 541 be separated and used in a variety of engine types. Of course, the structure of holding the bearing or the shaft on the inner peripheral resin portion and the technique of installing openings 214 for ventilation for the cover 212 be separated from each other and used in a variety of engine types.

The respective elements shown in the embodiments and the modification may be suitably combined with each other as long as no contradiction occurs.

The engine according to the present disclosure may be used as a drive source for a variety of purposes.

LIST OF REFERENCE NUMBERS

1

engine

2

fixed unit

3

rotary unit

4

bearing mechanism

5

circuit board

23

wave

31

rotor core

32

magnet

33

resin section

41

Bearing (upper bearing, lower bearing)

311

Outer core section

312

Inner core section

313

connecting portion

331

Upper resin section

332

lower resin section

333

Inner peripheral resin section

334

inner cylindrical resin portion (cylindrical resin portion)

335

outer cylindrical resin portion (other cylindrical resin portion)

336

web section

541

Outer core element

551

Core section with large diameter

552

Core section with a small diameter

561

inlet hole

564

Flügelradanbringungsabschnitt

566

first lower core carrier mark (first core carrier mark)

567

second lower core carrier mark (second core carrier mark)

571

Resin section of large diameter

572

Resin section with a small diameter

573

stepped resin section

J1

central axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 7977831 [0003, 0003]

Claims (8)

Engine ( 1 ), comprising: a rotary unit ( 3 ) which rotates on a vertical central axis and has magnets; a fixed unit ( 2 ) disposed around the turntable; and a bearing mechanism ( 4 ) rotatably supporting the rotary unit relative to the fixed unit, the fixed unit comprising: a stator disposed around the rotary unit; and a cover that is electrically conductive and covers an upper surface of the stator, the stator comprising: a stator core including a plurality of teeth and a core back; and a coil wound around the stator core via an insulator, and wherein, in plan view, the cover has openings formed at at least one of circumferential intervals between adjacent teeth, and the cover is connected to a ground potential. A motor according to claim 1, wherein a number of said teeth and a number of said openings are identical. An engine according to claim 1 or 2, wherein said openings have a shape whose circumferential width gradually increases toward a radially outer side. A motor according to claim 1 or 2, wherein the openings are formed of a plurality of groups of openings. A motor according to any one of claims 1 to 3, wherein the cover has a central opening in which the rotary unit is disposed at the center, and an inner peripheral edge constituting the central opening of the cover is notched toward a radially outer side and the openings connected is. A motor according to claim 5, wherein the rotary unit is provided with an impeller mounting portion to which an impeller shell is fixed, and the impeller mounting portion is disposed above the cover. Engine according to one of claims 1 to 6, wherein the engine has at least eight poles. Motor according to one of claims 1 to 7, in which the rotary unit has the following features: a plurality of magnets ( 32 ) arranged in a circumferential direction; a rotor core ( 31 ) formed of a plurality of magnetic steel plates laminated axially; and a resin section ( 33 ), which covers the plurality of magnets and the rotor core, wherein in plan view, a radial length of each of the plurality of magnets is longer than a circumferential length, wherein the rotor core (FIG. 31 ) has the following features: an annular inner core section ( 312 ) disposed on a radially inner side of the plurality of magnets; an outer core section ( 311 ) disposed on a radially outer side of the inner core portion; and a plurality of connection sections ( 313 ) connecting the outer core portion and the inner core portion in a radial direction, the outer core portion having a plurality of outer core elements (FIGS. 541 ), which are connected to the inner core portion by the plurality of connecting portions, and wherein the resin portion (FIG. 33 ) has the following features: an upper resin section ( 331 ) covering at least a part of an upper surface of the rotor core and at least a part of an upper surface of each magnet; and a lower resin portion ( 332 ) covering at least a part of a lower surface of the rotor core and at least a part of a lower surface of each magnet.

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