WO2002027895A1

WO2002027895A1 - Brushless motor

Info

Publication number: WO2002027895A1
Application number: PCT/JP2001/007938
Authority: WO
Inventors: Osamu Takahashi
Original assignee: Zexel Valeo Climate Control Corporation
Priority date: 2000-09-27
Filing date: 2001-09-13
Publication date: 2002-04-04
Also published as: JP2002112504A

Abstract

A brushless motor, wherein a cooling air passage (5) is formed so as not to communicate with a storage chamber (26) having a control circuit (28) stored therein and so that cooling air can be supplied to the outer surface of the storage chamber (26) and an armature winding (18), whereby, because the cooling air flows through the outer surface of the storage chamber (26) without entering into the storage chamber (26), sufficient cooling air can be provided to the control circuit (28) without causing, in the control circuit (28), a problem due to the moisture and dust contained in the cooling air by, for example, disposing a heat sink (31) for the control circuit (28), and the armature winding (18) can be cooled positively.

Description

Description Brushless motor Technical field

The present invention relates to a brushless motor used as a blower motor for a vehicle air conditioning system, for example. Background art

2. Description of the Related Art Conventionally, as one of the prior arts related to the present invention, there is an in-vehicle blower described in Japanese Patent Application Laid-Open No. H10-191595. This consists of an aluminum alloy motor housing, a cooling fin formed on the upper surface of the disk-shaped base of the motor housing, a blower fan provided on the upper surface side of the motor housing, It has an auxiliary blade provided at the lower part of the blower fan and a storage chamber for storing a control circuit board provided on the lower surface side of the motor housing. Three cooling fins are formed at an angular interval of 120 degrees in the circumferential direction of the base of the motor housing, and are located inside the blower fan. With such a configuration, cooling air is introduced from the cooling unit into the storage room in which the control circuit board is stored, and the rotation of the blower fan, that is, the auxiliary blade, causes the space between the storage room and the motor housing to rotate. By applying cooling air from the storage room to the cooling fins through such gaps, the cooling fins on the top surface of the housing are cooled. .

However, according to such a conventional technique, the cooling fin is provided at the lower portion inside the blower fan, and the cooling fan is not provided. —Since the cooling air is supplied to the cooling fins through the gap between the housing and the like, it is difficult to supply sufficient cooling air to the cooling fins. In other words, the lower part on the inner side of the blower fan where the cooling fins are provided is a part where the wind does not flow much, and the lower part is used to pass through the gap between the storage room and the housing. Since the ventilation resistance increases, there is a problem that the cooling fins cannot be cooled sufficiently even if an auxiliary blade is provided at the lower part of the ventilation fan. Further, since the cooling air is introduced into the storage room in which the control circuit board is stored, there is a problem that moisture and dust may enter the storage room along with the cooling air, thereby causing a problem to the control circuit. The present invention has been made on the basis of the above-described viewpoints, and its purpose is to supply sufficient cooling air for cooling the control circuit without causing any harm to the control circuit, and to actively reduce the armature winding. An object of the present invention is to provide a brushless motor that can be cooled to a high speed. Disclosure of the invention

According to the first aspect of the present invention, the cooling chamber is configured so as to be able to supply cooling air to the outer surface of the storage chamber and the armature winding without communicating with the storage chamber storing the control circuit. A brushless motor having an air passage is provided. According to such a configuration, the cooling air passage allows cooling air to flow to the outer surface of the storage room storing the control circuit and does not flow into the storage room. By arranging a member to be cooled such as a heat sink for the control circuit on the outer surface. Sufficient cooling for the control circuit without causing adverse effects due to moisture and dust carried by the cooling air to the control circuit. Can be given. Further, since the cooling air is supplied to the armature winding, the armature winding can be actively cooled. As a more preferred embodiment, the control circuit has a heat sink disposed on the outer surface of the storage chamber, and the cooling air flows through the cooling air passage so that the cooling air passes through the heat sink toward the armature winding. A brushless motor configured to be supplied is provided.

Further, as a more preferred embodiment, a motor flange provided with the armature winding on one surface and the storage chamber on the other surface is provided.

A brushless motor is provided in which the cooling air passage is formed so as to pass between the motor flange and the storage chamber and communicate with the vicinity of the armature winding.

Further, as a more preferred embodiment, a motor flange having the armature winding provided on one surface and the storage chamber provided on the other surface,

A brushless motor is provided in which the cooling air passage is formed so as to pass through a side surface or a lower surface of the storage chamber and communicate with the vicinity of the armature winding. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional configuration diagram showing a first example of an embodiment of the present invention.

FIG. 2 is a diagram showing the lower surface of the mode flange of FIG.

FIG. 3 is a diagram showing a cross section taken along line AA of FIG.

FIG. 4 is a main part configuration diagram showing a second example of the embodiment of the present invention.

FIG. 5 is a main part configuration diagram showing a third example of the embodiment of the present invention. FIG. 6 is a main part configuration diagram showing a fourth example of the embodiment of the present invention.

FIG. 7 is a cross-sectional configuration diagram showing another example of the cooling air introduction portion of the cooling air passage of FIG.

FIG. 8 is an explanatory diagram for explaining the supply of the cooling air to the cooling air introduction unit in FIG.

FIG. 9 is a cross-sectional configuration diagram showing still another example of the cooling air introduction portion of the cooling air passage in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings.

The members, arrangement, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIG. 1 is a configuration diagram showing a first example of an embodiment of the present invention, and shows a case where the present invention is applied to a blower of a vehicle air conditioning system.

In FIG. 1, 1 is a motor flange, 2 is an opening, 3 is a stator, 4 is a circuit case, and 5 is a cooling air passage. The motor flange 1 forms a bottom surface of a blower case (not shown), and a rotor 2 and a stay 3 are provided on one upper surface, and a circuit case 4 is provided on the other lower surface. I have. In this example, the cooling air passage 3 is formed between the motor flange 1 and a later-described storage room 26 of the circuit case 4.

The rotor 2 is a cylindrical container provided with a centrifugal fan 6 such as a sirocco fan on the outside, and is arranged such that a closed surface forms an upper surface and an open surface forms a lower surface. A plurality of permanent magnets 7 In addition to being provided, a plurality of ventilation holes 8 are formed on the upper surface. The rotor 2 has a shaft hole 9 at the center of the upper surface, and is fixed to the upper part of the motor shaft 10 via the shaft hole 9. The motor shaft 10 is rotatably supported by a support cylinder 13 via bearings 11 and 12. The support cylinder 13 is arranged to stand upright in a hole 15 formed in a concave portion 14 of the flange 1 for receiving the lower end thereof. The lower end of the motor shaft 10 protrudes into the storage room 26 of the circuit case 4, and a sensor magnet 16 for detecting the row position is fixed to the protruding portion. ing.

The stay 3 has a laminated core 17, an armature winding 18 wound around the laminated core 17, an upper holding member 19 and a lower holding member 20, and It is located inside. A support tube 13 is disposed in the laminated core 17 so as to penetrate the center portion thereof, and the support tube 13 is fixed to the laminated core 17 by, for example, press-fitting. The upper holding member 19 and the lower holding member 20 have holes 21 and 22 for receiving the support tube 13, and are provided at the upper and lower portions of the laminated core 17 through the holes 21 and 22. Each is provided to hold the laminated core 17. The lower holding member 20 has an L-shaped fixing portion 20a that protrudes outward. The fixing portion 20a is fixed to the motor flange 1 so that the rotor 2 and the stationary member 20a are fixed. Evening 3 is to be held on top of motor flange 1. The fixing portion 20a of the lower holding member 20 is held between the holder member 25 and the mobile flange 1 via the elastic members 23 and 24, so that Fixed to range 1. The elastic members 23 and 24 are vibration absorbing means for the mouth 2 and the stay 3.

The circuit case 4 has a storage room 26. Controls the commutation of the magnetic pole position of the sensor magnet 16 provided on the evening axis 10, i.e., the magnetic sensing element 27 such as a Hall element for detecting the position of the mouth and the armature winding 18. A control circuit 28 including a switching element such as a power FET, not shown, and a capacitor 29 are housed. These together with a sensor magnet 16 provided on the motor shaft 10 serve as driving means for the brushless motor. Make up. The upper surface of the storage chamber 26 facing the lower surface of the motor flange 1 is formed of a bare chip mounting substrate 30 provided so as to close the upper end surface of the circuit case 4. The bare chip mounting board 30 is an aluminum board in this example, and the control circuit 28 is mounted on the surface on the storage room 26 side. In the present example, the elements such as the power FET of the control circuit 28 are mounted on the aluminum substrate 30 in the state of the unmolded bare chip so that the size of the control circuit 28 can be reduced. It is provided. Therefore, the heat generated by the element such as the first FET is sufficiently transmitted to the aluminum substrate 30. A heat sink 31 for cooling the control circuit 28 is provided on the outer surface of the aluminum substrate 30 opposite to the mounting surface of the control circuit 28. Heat sink 3 1 is. In this example, the base 3 la is made of aluminum and has a flat base 3 la and a plurality of fins 3 lb standing parallel to each other on one surface of the base 3 la. One surface of the base 3 la is made of aluminum. The substrate 30 is provided, for example, by adhesion so as to be in close contact with the substrate 30. As described above, the heat sink 31 is composed of the flat base 31 a and the fin 31 b. Since there is no such material, easiness of manufacturing and cost reduction can be achieved. Also, the aluminum circuit on which the control circuit 28 is mounted is provided. Since the heat sink 31 can be provided over a wide surface of the memory substrate 30, the cooling capacity can be increased. The lower surface of the storage room 26 is formed of a flat lid 32 provided on the lower end surface by, for example, a screw to close the lower end surface of the circuit case 4. Although an aluminum substrate is used as the bare chip mounting substrate 30 in this example, a ceramic substrate can of course be used.

Such a circuit case 4 is configured as a one-piece module having an aluminum substrate 30 and a heat sink 31 and containing a control circuit 28 and a capacitor 29, etc. In this example, as described later, fitting and screwing are used to attach to a mounting frame 33 formed on the lower surface.

The cooling air passage 5 is formed between the lower surface of the motor flange 1 and the aluminum substrate 30 which is the upper surface of the storage room 26 of the circuit case 4 when the circuit case 4 is attached to the motor flange 1. Is done. Cooling air is introduced into the cooling air passage 5 through a cooling air introducing section 34, and the introduced cooling air flows into the heat sink provided on the aluminum substrate 30. It passes between the fins 31 of 31 and is supplied to the armature winding 18 through a plurality of blow openings 37 a to 37 e, which will be described later, of the motor flange 1. The cooling air introduction part 34 is fixed to the motor flange 1 and the circuit case 4 by fitting in this example, and from the downstream of the blower through a connection between the pipe part 34 a and an air hose (not shown). Cooling air is supplied to the cooling air inlets 3 4. The amount of cooling air introduced into the cooling air passage 5 can be easily changed by changing the effective diameter of the cooling air introduction part 34, for example, the effective diameter of the pipe part 34a. The book In the example, the cooling air introduction part 34 is fixed by fitting, but the invention is not limited to this. Fix by screwing. (Of course, this may be done.

FIG. 2 is a view showing the lower surface of the motor flange 1, in which the circuit case 4 is not provided. FIG. 3 is a view showing a cross section taken along the line AA of FIG. 2 in a state where the circuit case 4 is provided, and the rotor 2 and the stay 3 are not shown. Note that the configuration of FIG. 1 shows the armature winding 18 of the stay 3 corresponding to the cross section B—B in FIG. 2 with the circuit case 4 provided. Thus, they are connected to the motor terminals 35a, 35b, 35c provided in the recesses 14 of the motor flange 1. The motor terminals 35 a to 35 c are provided around the hole 15 of the recess 14, and the flange 13 a and the motor flange formed at the lower part of the support tube 13 are provided. The recessed portion 14 is formed so as to penetrate the bottom surface 14 a of the circuit case 4 and the aluminum substrate 30 of the circuit case 4 and project into the storage room 26 of the circuit case 4. The free ends of the terminals 35a to 35c protruding into the storage room 26 are connected to the storage room 26 of the circuit case 4 when the circuit case 4 is installed in the module flange 1. It is connected to a bus bar (not shown) inside, and is connected to the control circuit 28 through this. It should be noted that the terminals 35a to 35c are not electrically connected to the aluminum substrate 30 as a matter of course.

The motor terminals 35 a to 35 c are provided on the bottom 14 a of the recess 14 of the motor flange 1 through which the motor terminals 35 a to 35 c pass and the flange 13 a of the support cylinder 13. As shown in FIG. 1, a first seal member 36 is provided to waterproof the penetrating portion. As a result, from the top side of the unit flange 1, that is, the fan 6 side, Water is prevented from entering the storage room 26 of the circuit case 4 through the through portions of the motor terminals 35 a to 35 c and the gap between the support tube 13 and the motor flange 1.

In the present example, five ventilation openings 37 a, 37 b, 37 c, 37 d, and 37 e are provided around the outer periphery of the recess 14 of the motor flange 1 as shown in FIG. Are formed through. The ventilation openings 37a to 37e communicate with the cooling air passage 5 and are located near the lower part of the armature winding 18 as shown in FIG. The cooling air passing through 1 can be given to the armature winding 18.

The mounting frame 33 on the lower surface of the motor flange 1 has the motor shaft 10, the motor terminals 35 a to 35 c, and the ventilation openings 37 a to 37 e inside the mounting frame 33. It is formed as follows. As shown in FIG. 2, the mounting frame 33 has a fitting groove 38 formed all around the joint surface with the circuit case 4 and a screw for fixing the circuit case 4 to the circuit case 4. Overhang portions 39 a and 39 b are formed. As shown in FIG. 3, the circuit case 4 is provided with fitting protrusions 40 that fit into the fitting grooves 38 of the mounting frame 33 on the entire surface of the mounting flange 3 of the module flange 1 as shown in FIG. It has a fixed portion 41 a and 4 lb that is screwed to the overhanging portions 39 a and 39 b of the mounting frame 33 of the unit flange 1, as well as to extend over the circumference. For the circuit case 4, the fitting protrusions 40 of the circuit case 4 are fitted into the fitting grooves 38 of the mounting frame 33 of the motor flange 1 so that the fixing portions 4 la and 4 lb of the circuit case 4 are fixed. It is assembled to the motor flange 1 by fixing it to the overhangs 39 a and 39 b of the mounting frame 33 of the flange 1 with screws 42. In this example, packing etc. is used to attach circuit case 4 to motor flange 1. Since no intervening parts are provided, the number of parts and the number of steps can be reduced.

Between the lower surface of the motor flange 1 and the aluminum substrate 30 which is the upper surface of the circuit case 4, the cooling air of the cooling air passage 5 is connected to the terminals 35 a to 35 c and the aluminum substrate 3. As shown in FIGS. 1 and 2, a second seal member is provided so as not to enter the storage room 26 through the gap between the motor shaft 10 and the aluminum shaft 30 and the gap between the motor shaft 10 and the aluminum substrate 30. 4 3 are provided. The second sealing member 43 is connected to the motor terminals 35a to 35c and the blow openings 37a to 35c so as to surround the motor terminals 35a to 35c and the motor shaft 10. 7 e Provided between and. As a result, the cooling air introduced from the cooling air introduction part 34 is not supplied into the storage room 26 of the circuit case 4 and the air blowing openings 37 a through the heat sink 31 are not provided. The control circuit 28 and the armature winding 18 are supplied from 37 e to the armature winding 18 to be cooled in series.

As shown in FIG. 1, the lower surface of the cooling air passage 5 of the flange 1 has a stepped portion 44, 45, which faces the cooling air from the cooling air inlet 34, as shown in FIG. It is formed gently to reduce ventilation resistance. The heat sink 31 is configured such that the fin 31b is substantially in contact with the lower surface of the motor flange 1 from the viewpoint of miniaturization of the brushless motor. This makes it possible to reduce the height dimension of the brushless motor. The heat sink 3 is, of course, provided so that the fins 31b are parallel to the flow of the cooling air.

In the brushless motor having such a configuration, the rotor position is detected by the magnetically sensitive element 27, and based on the detection, the controller 3 The rotor 2, that is, the fan 6 is driven by controlling the commutation of the armature winding 18 by the control circuit 28. Due to this driving, the switching elements of the control circuit 28, particularly the power FET, generate heat, and the armature winding 18 generates heat. The elements such as the power FET of the control circuit 28 are provided in contact with the aluminum substrate 30 by bare chip, and the heat sink 31 is provided in close contact with the aluminum substrate 30. The heat generated by the control circuit 28 is sufficiently transmitted to the heat sink 31 provided in the cooling air passage 5. The cooling air introduced from the cooling air introduction section 34 passes through the heat sinks 31 between the plurality of fins 31b to the ventilation openings 37a to 37e. The sink 31 is sufficiently cooled. That is, sufficient cooling can be provided to the control circuit 28. The cooling air is prevented from entering the storage room 26 of the circuit case 4 by the second seal member 43, so that moisture, dust, etc., enter the storage room 26 due to the cooling air. There is no. The cooling air coming out of the blower openings 37a to 37e is supplied to the armature winding 18 and actively cools the armature winding 18, and then the fan 6 rotates to rotate the blower. Get out of the case. Thus, since the armature卷線1 8 is actively cooled with the control circuit 2 8, _c 4 capable of achieving motor evening improved efficiency can and this to reduce the copper loss is the present invention FIG. 4 is a main part configuration diagram illustrating a second example of the embodiment, and corresponds to a cross section taken along line A-A in FIG. 2 in a state where the circuit case 4 is provided. A cooling air passage 50 is formed so as to pass through, and the heat sink 51 of the control circuit 28 is provided in the cooling air passage 50. The cooling air passage 50 is provided in the same manner as the cooling air passage 5 described in the first example. It is connected to 34 and has ventilation openings 37a to 37e. The heat sink 51 includes an L-shaped base 52 having an upper surface portion 52a and a side surface portion 52b, and a plurality of fins 5 standing on one surface of the side surface portion 52b of the base portion 52. The upper surface 5 2a of the base 5 2 is in close contact with the aluminum substrate 30 and the side 5

The fin 53 of 2b is provided so as to be located on the cooling air passage 50 side. The storage room 26 is isolated from the cooling air passage 50 by the heat sink 51 so that the cooling air does not enter the storage room 26. The heat generated by the control circuit 28 is transmitted to the heat sink 51 via the aluminum substrate 30, and the heat sink 51 passes through the cooling air passage.

The other configuration that is sufficiently cooled by the cooling air introduced at 50 is as described in the first example above.

FIG. 5 is a main part configuration diagram showing a third example of the embodiment of the present invention, which corresponds to a cross section A--A in FIG. 2 in a state where a circuit case 4 is provided. A cooling air passage 60 is formed so as to pass through the lower surface of the storage room 26 of No. 4, and a heat sink 61 of a control circuit 28 is provided in the cooling air passage 60. Cooling air passage

Like the cooling air passage 5 described in the first example, the cooling air passage 60 is connected to the cooling air introduction section 34 and communicates with the ventilation openings 37 a to 37 e. The heat sink 61 has the same configuration as the heat sink 31 described in the first example, and its base 61 a is formed of an aluminum substrate.

30 and a plurality of fins 61b are arranged on the cooling air passage 60 side. The heat generated by the control circuit 28 is transmitted to the heat sink 61 via the aluminum substrate 30 so that the heat sink 61 is sufficiently cooled by the cooling air introduced into the cooling air passage 60. ing. Other configurations are as described in the first example above. is there.

FIG. 6 is a main part configuration diagram showing a fourth example of the embodiment of the present invention, and corresponds to a cross section taken along line AA of FIG. 2 in a state where the circuit case 4 is provided. 1 and the heat sink 70 forming the upper surface of the storage room 26 of the circuit case 4, form a cooling air passage 71, and replace the bare chip mounting board 30 in the storage room 26. The plastic substrate 72 is to be stored. The heat sink 70 has the same configuration as the heat sink 31 described in the first example, and its base 70 a is provided so as to close the upper end surface of the circuit case 4. The fin 7 Ob is arranged on the cooling air passage 71 side. The cooling air passage 71 is connected to the cooling air introduction part 34 as in the cooling air passage 5 described in the first example, and communicates with the ventilation openings 37a to 37e. . The control circuit 28 is mounted on the plastic substrate 72 so that the switching element 28 a such as a power FET, which is a heating element of the control circuit 28, is in close contact with the back surface of the heat sink 70. It is provided in. The heat generated by the switching element 28 a is transmitted to the heat sink 70, and the heat sink 70 is sufficiently cooled by the cooling air introduced into the cooling air passage 71. Other configurations are as described in the first example.

Also in the second example of FIG. 4 and the third example of FIG. 5, a plastic substrate can be used instead of the bare chip mounting substrate 30 as in the fourth example of FIG.

FIG. 7 is a sectional view showing another example of the cooling air introduction part of the cooling air passage 5, and FIG. 8 is an explanatory diagram for explaining supply of cooling air to the cooling air introduction part of FIG. In this example, the cooling air inlet of cooling air passage 5 The cooling air introduction section 80 is configured so as to be directly connected to the cooling air supply pipe 82 of the blower case 81 without passing through an air hose. The cooling air introduction part 80 is fixed to the motor flange 1 and the circuit case 4 by fitting, and is formed in an L shape so that the pipe part 80a faces the bottom surface 81a of the blower case 81. Have been. As shown in FIG. 8, the blower case 81 has a tongue 84 extending between the fan 6 and the blower outlet 83 from the inner wall of the blower case 81 to the inside of the blower case. A cooling chamber 85 is provided on the tongue portion 84 on the side of the blower outlet 83. The cooling chamber 85 has a cooling air intake port 86 on the side of the blower outlet 83, and a cooling air supply pipe 82 opens at the bottom surface 85a of the cooling chamber 85. The cooling air supply pipe 82 is formed integrally with the blower case 81 and extends downward. The cooling air supply pipe 82 is connected to the pipe section 80a of the cooling air introduction section 80 at the same time when the blower case 81 is attached to the motor flange 1. As a result, cooling air is supplied from the cooling chamber 85 to the cooling air passage 5. In other words, since the evaporator 87 is provided downstream of the blower outlet 83 of the blower case 81, the air discharged from the blower outlet 83 becomes hard to flow due to the ventilation resistance. Part of the cooling air flows into the cooling chamber 85 having a low ventilation resistance, and is supplied to the cooling air passage 5 through the connection between the cooling air supply pipe 82 and the cooling air introduction section 80. According to this example, since it is not necessary to use an air hose, the number of parts and the number of steps can be reduced. In addition, since the connection between the cooling air introduction section 80 and the cooling air supply pipe 82 can be made together with the assembly of the blower case 81 to the motor flange 1, the number of processes can be reduced. it can. Other configurations are the first example As described in the above.

FIG. 9 is a cross-sectional configuration diagram showing still another example of the cooling air introduction portion of the cooling air passage 5. In this example, the cooling air introduction portion 90 of the cooling air passage 5 is formed by the motor flange 1 and the circuit case 4. The upper part 91 of the cooling air introduction part 90 is formed integrally with the motor flange 1, the lower part 92 is formed integrally with the circuit case 4, and the circuit case 4 is formed of the motor flange. By being attached to 1, the upper part 91 and the lower part 92 are fitted to each other to form a cooling air introduction part 90. The upper part 91 of the cooling air introduction part 90 has a pipe part 91a extending upward, and the upper end surface of the pipe part 91a is open. As described with reference to FIGS. 7 and 8, the blower case 81 is attached to the motor flange 1 at the same time as the blower case, as described in FIGS. 7 and 8. 8 1 Connected to cooling air supply pipe 8 2. Other configurations are as described in FIGS. 7 and 8. According to this example, since it is not necessary to attach the cooling air introduction part as a separate part, the number of parts and the number of steps can be further reduced.

As described above, according to the present invention, the cooling air passage is provided so as to be able to supply cooling air to the outer surface of the storage chamber and the armature winding without being communicated with the storage chamber in which the control circuit is stored. By arranging a member to be cooled, such as a heat sink of a control circuit, on the outer surface of the storage chamber, adverse effects caused by moisture, dust, and the like carried by the cooling air are generated in the control circuit. Sufficient cooling can be provided to the control circuit without causing cooling, and cooling air is also applied to the armature windings, so that the armature windings can be actively cooled and the motor efficiency can be improved. Can be improved. In addition, since the cooling air passage is formed by the motor flange and the storage room for accommodating the control circuit, it is not necessary to prepare a dedicated part for forming the cooling air passage, and the existing parts can be effectively used. The use and the number of parts can be reduced.

In addition, since the upper surface of the storage chamber for storing the control circuit is formed of the bare chip mounting board on which the control circuit is mounted, there is no need to prepare a separate component for forming the upper surface of the storage chamber, and the components are effectively It can be used.

In addition, since the heat sink for the control circuit is provided on the bare chip mounting board that forms the upper surface of the storage room, the heat sink does not need to be formed into a special shape. The heat sink can be reduced, and a heat sink can be provided over a wide surface of the bare chip mounting board, so that the cooling capacity can be improved.

In addition, since the ventilation resistance is reduced so as to reduce the ventilation resistance in the stepped portion of the motor flange in the cooling air passage, the cooling capacity can be improved.

In addition, since the circuit case forming the storage room is configured as a single module including a control circuit, it is possible to mount the control unit of the brushless motor by mounting the circuit case on the motor flange. In addition to facilitating manufacturing, it can be configured so that it can be shared even when the size of the rotor and the stay are different.

Furthermore, the cooling air introduction part of the cooling air passage has an L-shaped pipe part, and when the motor flange is assembled to the blower case, the cooling air introduction part has a cooling air flow in the blower case. Connect to supply pipe The use of an air hose eliminates the need for air hoses, reducing the number of parts and the number of processes.In addition, the cooling air introduction section is installed together with the blower case and motor flange. The connection with the cooling air supply pipe can be made, and the number of processes can be reduced.

Industrial applicability

As described above, the brushless motor according to the present invention is suitable for use as a motor for a blower of a vehicle air conditioning system.

Claims

The scope of the claims

1. The storage chamber in which the control circuit is stored is not communicated with, and has a cooling air passage formed so as to supply cooling air to the outer surface of the storage chamber and the armature winding. And a brushless motor.

2. The control circuit has a heat sink disposed on an outer surface of the storage chamber, and cools the cooling air passage so that cooling air passes through the heat sink toward the armature winding. The brushless motor according to claim 1, wherein the brushless motor is configured to supply wind.

3. A motor flange having the armature winding provided on one side and the storage chamber provided on the other side,

The claim 1, wherein the cooling air passage is formed so as to pass between the motor flange and the storage chamber and communicate with the vicinity of the armature winding. Described brushless motor <

4. The cooling air passage is formed by the other surface of the motor flange and the upper surface of the storage chamber facing the other surface, and the motor frame is substantially opposed to the armature winding. 4. The brushless motor according to claim 3, wherein the brushless motor is formed so as to communicate with the armature winding through at least one air outlet formed in the flange.

5. The upper surface of the storage chamber is formed of a bare chip mounting board provided such that a mounted circuit side is inside the storage chamber. 4. Brushless mode overnight <

6. The surface on the cooling air passage side of the bare chip mounting board A heat sink for the control circuit is provided, so that the cooling air is supplied to the armature winding from the ventilation opening through the heat sink, and the control circuit is provided via the bare chip mounting board. 6. The brushless motor according to claim 5, wherein the brushless motor is configured to be cooled by the heat sink.

7. The method according to claim 4, wherein a step portion of the motor flange in the cooling air passage is formed so as to be gentle so as to reduce ventilation resistance. Brushless motor

8. A motor flange provided with the armature winding on one surface and the storage room on the other surface,

2. The brushless according to claim 1, wherein the cooling air passage is formed so as to pass through a side surface or a lower surface of the storage chamber and communicate with the vicinity of the armature winding. motor.

9. The circuit case forming the storage chamber is configured as a one-piece module including the control circuit, and is provided so as to be attached to the module flange. The brushless model described in Paragraph 3 of the section.

10. The circuit case forming the storage chamber is configured as a one-piece module including the control circuit, and is provided so as to be attached to the module flange. 9. The brushless motor according to claim 8, wherein

1 1. The brushless motor is a blower motor of a vehicle air conditioning system,

The cooling air passage has a cooling air introduction part for introducing cooling air,

The cooling air introduction part is provided, and the motor flange is mounted on a blower case. 4. The brushless motor according to claim 3, further comprising an L-shaped pipe portion connected to a cooling air supply pipe of the blower case when the blower case is turned off.

12. The brushless motor is a blower motor of a vehicle air conditioning system,

The cooling air introduction portion has an L-shaped pipe portion connected to a cooling air supply pipe of the blower case when the motor flange is assembled to the blower case. 9. The brushless morning set forth in claim 8.