CN203368233U

CN203368233U - Local heat radiation type direct current motor

Info

Publication number: CN203368233U
Application number: CN 201320375422
Authority: CN
Inventors: 周连明; 周园园; 曹阳
Original assignee: NANTONG WANBAO INDUSTRY Co Ltd
Current assignee: NANTONG WANBAO INDUSTRY Co Ltd
Priority date: 2013-06-27
Filing date: 2013-06-27
Publication date: 2013-12-25
Anticipated expiration: 2023-06-27

Abstract

The utility model provides a local heat radiation type direct current motor. The local heat radiation type direct current motor comprises a stator and a rotor, wherein the stator comprises electromagnetic poles which are uniformly arranged in a circumference direction, the electromagnetic poles are twined by excitation coils, the rotor comprises a rotation shaft and a permanent magnet fixed on the rotation shaft, two work poles of the permanent magnet are symmetrical relative to the rotation shaft, the direct current motor comprises a fan, the fan comprises two heat radiation portions which depart from each other 180 DEG in a circumference direction, the fan is fixed on the rotation shaft, a center connection line of the two heat radiation portions and a center connection line of the two work poles are crossed to have an included angle, and the included angle is equal to a circumference opening angle of two adjacent electromagnetic poles relative to the rotation shaft. The local heat radiation type direct current motor not only can realize reliable heat radiation through the fan, but also can obviously reduce heat radiation energy consumption.

Description

Local heat dissipation type direct current machine

Technical field

The utility model relates to machine field, especially, and the direct current machine field that relates to be formed by permanent magnet rotor.

Background technology

Brshless DC motor is comparatively universal at present, and because it does not have brush structure, the mechanicalness fault is few, safeguards more for convenience, therefore, in each field, is widely used in recent years.

For brshless DC motor, its cooling mechanism does not but have essential distinction with conventional motors, is mainly that the fan by being fixed in the rotating shaft end is realized; For fan, mainly by two kinds of blade fan and centrifugal fans, and which kind of fan no matter, generally believe at present, the blade of fan circumferentially distributes more evenly better, general, by circumferential 6 uniform above flabellums, perhaps centrifugal air draught district forms, and in the heat radiation process, fan carries out Homogeneouslly-radiating to whole motor internal zone.

Yet the problem existed is, flabellum is more or centrifugal air draught district is more, and the resistance that fan is subject to is larger, and this will make motor produce higher radiation energy consumption; Therefore, for can secure heat dissipation, can obviously reduce again the electric motor fan of radiation energy consumption, there is practical significance and demand.

The utility model content

For the problems referred to above, the purpose of this utility model is to provide a kind of local heat dissipation type direct current machine, and this motor not only can dispel the heat reliably by fan, and can obviously reduce radiation energy consumption.

The technical scheme that the utility model technical solution problem adopts is: this local heat dissipation type direct current machine comprises stator, rotor; Described stator comprises circumferentially uniform electromagnetic pole, on described electromagnetic pole, is wound with magnet exciting coil; Described rotor comprises rotating shaft and is fixed in the permanent magnet in rotating shaft, two work magnetic poles of permanent magnet about the rotating shaft symmetry; Described direct current machine also comprises fan, and described fan comprises two radiating parts that circumferentially differ 180 °; Described fan is fixed in described rotating shaft, and the line of centres of the line of centres of two described radiating parts and described permanent magnet two work magnetic poles intersects an angle, and this angle equals on described stator adjacent two electromagnetic poles about the circumferential subtended angle of described rotating shaft.

As preferably, described fan is centrifugal fan, comprises the interior plectane that approaches rotor and, away from the excircle board of rotor, inside and outside plectane is parallel to each other, and the cavity bottom between inside and outside plectane is sealed by the axis hole hole wall matched with described rotating shaft; Described interior plectane is provided with two described radiating parts, and each radiating part consists of the cross through hole that is fan-shaped distribution.

As preferably, also be provided with the reinforcement gusset that connects inside and outside plectane between described interior plectane, excircle board.

As preferably, described reinforcement gusset is provided with two pairs, strengthens the gusset described radiating part of double team a slice respectively for every pair; Make the air entered in cavity by described cross through hole suffer restraints, by the shortest active path, radially discharge cavity.

As preferably, for the cross through hole on each described radiating part, adjacent cross through hole aperture difference; Like this, can make cross-current enter the air density inequality of radiating part, this makes this part air draught generation be parallel to the velocity component on interior plectane surface, thereby makes the heat on interior plectane surface also can obtain faling apart and removing efficiently.

Principle of the present utility model is: when the part of stator silicon steel during by fast-magnetic, the atomic ordered degree of magnetized area improves rapidly, thereby the magnetic cooling back wash effect occurs, be exothermic effect, in of short duration magnetization process, make the temperature of magnetized area apparently higher than other zone, now, as radiated energy concentrated on to this rapid magnetized zone, be conducive to improve radiating efficiency, thereby save radiation energy consumption; And for common inner-rotor brushless direct current machine, when the work magnetic pole of rotor during over against a stator electromagnetic pole, this stator electromagnetic pole outage, then connect next electromagnetic pole, thus the work magnetic pole of rotor is drawn by next electromagnetic pole, continuing rotation goes down; Therefore, in the utility model, the line of centres of two work magnetic poles of the line of centres of two described radiating parts and described permanent magnet intersects an angle, while making the working rotor magnetic pole over against a stator electromagnetic pole, fan cooling section just to the next one rapid magnetized electromagnetic pole dispelled the heat; In addition, what at electromagnetic pole, cut off the power supply is instantaneous, the rapid degaussing of electromagnetic pole, and silicon steel atomic ordered degree descends rapidly, thereby the magnetic cooling effect occurs, and fast from heat absorption on every side, with the zone beyond the radiating part that ensures fan, also can effectively be dispelled the heat again.

The beneficial effects of the utility model are: this local heat dissipation type direct current machine is concentrated radiated energy, high efficiency and heat radiation is carried out in each instantaneous main hot zone of motor internal, and radiated energy is not wasted in less important hot zone; In fact, because described main hot zone is continuous rotation, therefore ensured equally the great heat radiation effect in whole motor internal zone; This motor is down to minimum (if only have a radiating part, fan is by imbalance) by the radiating part quantity of fan, is significantly reducing frictional resistance, has reduced, on the basis of radiation energy consumption, to have realized the good heat radiating to whole motor internal zone.

The accompanying drawing explanation

Fig. 1 is in this local heat dissipation type direct current machine, the structural representation of stator, rotor.

Fig. 2 is in this local heat dissipation type direct current machine, an embodiment schematic diagram of fan.

Fig. 3 is that the A-A of Fig. 2 is to cutaway view.

Fig. 4 is that in this local heat dissipation type direct current machine, the instantaneous position of the radiating part of rotor and fan concerns comparison diagram.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further illustrated:

In embodiment, this local heat dissipation type direct current machine comprises stator 1, rotor 2 as shown in Figure 1, Figure 2, Figure 3 shows; Described stator 1 comprises circumferentially uniform electromagnetic pole 10, on described electromagnetic pole 10, is wound with magnet exciting coil; Described rotor 2 comprises rotating shaft and is fixed in the permanent magnet in rotating shaft, two work magnetic poles 20 of permanent magnet about the rotating shaft symmetry; Described direct current machine also comprises fan 3, and described fan comprises two radiating parts 31 that circumferentially differ 180 °; Described fan is fixed in described rotating shaft, and the line of centres of the line of centres of two described radiating parts 31 and described permanent magnet two work magnetic poles 20 intersects an angle, this angle equal adjacent two electromagnetic poles 10 on described stator 1 ', 10 " about the circumferential subtended angle of described rotating shaft; Visualization about this angle is explained, can be with reference to the position versus relation of the rotor 2 shown in figure 4 and fan 3, in Fig. 3, the S utmost point of the work magnetic pole 20 of rotor 2 over against an electromagnetic pole 10 of stator 1 ', now, the radiating part 31 of corresponding fan 3 is right against the electromagnetic pole 10 of stator 1 ".

What deserves to be explained is in addition, about the electromagnetic pole 10 of stator 1, be to be made in pairs on stator,, for an electromagnetic pole 10, if its when energising over against rotor the N utmost point, so, the right opposite of stator 1, certainly exist an electromagnetic pole symmetrical with this electromagnetic pole 10, these two electromagnetic poles are switched on simultaneously, and when energising, and heteropole is relative; And two work magnetic poles 20 of rotor 2, be that the S utmost point and the N utmost point are also symmetrical, two radiating parts 31 of fan 3 are also symmetrical, so, while setting forth the position relationship between the radiating part 31 of work magnetic pole 20, fan 3 of electromagnetic pole 10, the rotor 2 of stator 1 in this specification, only need to discuss a radiating part and a position relationship of working between magnetic pole or electromagnetic pole, for the position relationship between another radiating part and an other work magnetic pole or electromagnetic pole, due to symmetry, exercising result must be the same.

For described fan, an one embodiment as shown in Figure 2 and Figure 3, it is centrifugal fan, comprise the interior plectane 34 that approaches rotor and away from the excircle board 33 of rotor, inside and outside

plectane

34,33 is parallel to each other, and 300 bottoms of the cavity between inside and outside plectane are sealed by the hole wall 301 of the axis hole 30 matched with described rotating shaft; Described

interior plectane

34,33 is provided with two described radiating parts 31, and each radiating part consists of the cross through hole 310 that is fan-shaped distribution; Also be provided with the reinforcement gusset 32 that connects inside and outside plectane between described interior plectane 34, excircle board 33.

When fan 3 fast rotational, the air in fan cavity 300 radially outward throws away under centrifugal action, and the cross through hole 310 from interior plectane 34 to supplement the air thrown away in cavity 300, forms thermolysis with this from the motor internal extracting air.

For described reinforcement gusset 32, be provided with two pairs in the present embodiment, as shown in Figure 2, strengthen the gusset 32 described radiating part 31 of double team a slice respectively for every pair; Make the air entered in cavity by described cross through hole 310 suffer restraints, by the shortest active path, radially discharge cavity, sinuous flow in less cavity, further suppressed energy consumption.

In addition, for the cross through hole 310 on each described radiating part 31, when making, can make adjacent cross through hole aperture difference; Like this, can make cross-current enter the air density inequality of radiating part 31, this makes this part air draught produce the velocity component that is parallel to interior plectane 34 surfaces, the heat flow on plectane 34 surfaces in accelerating, thus make the heat on interior plectane 34 surfaces also can obtain faling apart and removing efficiently.

It is pointed out that what adopt in the present embodiment is centrifugal fan, in fact also can adopt blade examination fan, now, fan has the blade of two symmetries, corresponding to two in the present embodiment fan-shaped radiating parts 31.

In machine operation process in the utility model, when the work magnetic pole of rotor during over against a stator electromagnetic pole, this stator electromagnetic pole outage, then connect next electromagnetic pole, thus the work magnetic pole of rotor is drawn by next electromagnetic pole, continue rotation and go down; Therefore, in the utility model, the line of centres of two work magnetic poles of the line of centres of two described radiating parts and described permanent magnet intersects an angle, while making the working rotor magnetic pole over against a stator electromagnetic pole, the electromagnetic pole that heat release is being magnetized rapidly to the next one just in fan cooling section is dispelled the heat; In addition, what at electromagnetic pole, cut off the power supply is instantaneous, the rapid degaussing of electromagnetic pole, silicon steel atomic ordered degree descends rapidly, thereby the magnetic cooling effect occurs, again fast from heat absorption on every side, as can be seen here, this local heat dissipation type direct current machine is concentrated radiated energy, and high efficiency and heat radiation is carried out in each instantaneous main hot zone of motor internal, and radiated energy is not wasted in less important hot zone, only rely on the demagnetization endothermic effect of electromagnetic pole itself to be dispelled the heat to less important hot zone; And in fact, because described main hot zone is continuous rotation, therefore ensured equally the great heat radiation effect in whole motor internal zone; This motor is down to the radiating part quantity of fan minimum, is significantly reducing frictional resistance, has reduced, on the basis of radiation energy consumption, to have realized the good heat radiating to whole motor internal zone.

The foregoing is only preferred mode of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.

Claims

1. a local heat dissipation type direct current machine, comprise stator (1), rotor (2); Described stator comprises circumferentially uniform electromagnetic pole (10), on described electromagnetic pole, is wound with magnet exciting coil; Described rotor (2) comprises rotating shaft and is fixed in the permanent magnet in rotating shaft, two work magnetic poles (20) of permanent magnet about the rotating shaft symmetry; Described direct current machine also comprises fan (3), it is characterized in that: described fan comprises two radiating parts (31) that circumferentially differ 180 °; Described fan is fixed in described rotating shaft, and the line of centres of two work magnetic poles (20) of the line of centres of two described radiating parts (31) and described permanent magnet intersects an angle, this angle equal adjacent two electromagnetic poles on described stator (10 ', 10 ") are about the circumferential subtended angle of described rotating shaft.

2. local heat dissipation type direct current machine according to claim 1, it is characterized in that: described fan is centrifugal fan, comprise the interior plectane (34) that approaches rotor and away from the excircle board (33) of rotor, inside and outside plectane is parallel to each other, and the axis hole hole wall (301) matched with described rotating shaft in the cavity between inside and outside plectane (300) bottom seals; Described interior plectane (34) is provided with two described radiating parts (31), and each radiating part consists of the cross through hole that is fan-shaped distribution (310).

3. local heat dissipation type direct current machine according to claim 2, is characterized in that: also be provided with the reinforcement gusset (32) that connects inside and outside plectane between described interior plectane, excircle board.

4. local heat dissipation type direct current machine according to claim 3, it is characterized in that: described reinforcement gusset (32) is provided with two pairs, strengthens the gusset described radiating part of double team a slice (31) respectively for every pair.

5. according to any described local heat dissipation type direct current machine of claim 2-4, it is characterized in that: for the cross through hole (310) on each described radiating part (31), adjacent cross through hole (310) aperture difference.