JP2002223552A - Brushless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brushless motor for sure insulation of the terminal of armature coil winding and a conductive circuit board without increasing the number of components or the number of processes. SOLUTION: An insulation cover 39 is integrated by a component 30 made of resin for constituting the brushless motor, and the outer periphery of a terminal 38 of the armature coil winding 17 is covered with the insulating cover 39 to prevent electrical contact with the conductive circuit board 31, thus eliminating the need for preparing the insulating cover 39 as a separate component, and hence surely insulating the terminal 38 of the armature coil winding 17 and the conductive circuit board 31, without having to increase the number of components or the number of processes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless motor used as, for example, a blower motor of a vehicle air conditioning system.

[0002]

In such a brushless motor, a bare chip mounting board made of aluminum is used to reduce the size of the control circuit for controlling the commutation of the armature windings. If it is necessary to provide the armature winding terminals, it is necessary to prevent the armature winding terminals from electrically contacting the aluminum substrate. From this viewpoint, it is conceivable that an insulator is interposed between the terminal of the armature winding and the aluminum substrate. However, according to this, not only must the insulator be prepared as a separate component, but also the mounting Process is required, which leads to complication in production and high cost. Further, there is a possibility that the insulator may come off due to vibrations from the motor itself or from the outside, which may cause a problem in reliability.

[0003] The present invention has been made based on the above-described viewpoint, and an object of the present invention is to ensure insulation between terminals of an armature winding and a conductive circuit board without increasing the number of parts and the number of steps. It is another object of the present invention to provide a brushless motor which can be used for a motor.

[0004]

According to the present invention, there is provided a housing having a conductive circuit board, a terminal of an armature winding penetrating the circuit board and projecting into the housing, and a brushless motor. Formed integrally with the resin component
The above object is achieved by a brushless motor having an insulating cover that covers an outer periphery of a terminal of the armature winding so that a terminal of the armature winding penetrating the circuit board does not make electrical contact with the circuit board. I do. According to such a configuration, since the insulating cover is integrally formed with the resin component constituting the brushless motor, there is no need to attach the insulating cover as a separate part, and there is no possibility that the armature will come off due to vibration. Insulation between the terminal of the wire and the conductive circuit board can be ensured.

[0005]

FIG. 1 is a sectional view showing an embodiment of the present invention, in which the present invention is applied to a blower of a vehicle air conditioning system. FIG. 2 is a diagram showing the lower surface side of the motor flange 1 in FIG. 1 and shows a state where the circuit case 4 is not provided. FIG. 3 is a view showing a cross section taken along line AA of FIG. 2 in a state where the circuit case 4 is provided.
The illustration of the stator 3 is omitted. FIG.
The configuration shown in FIG. 2B in a state where the circuit case 4 is provided is
It corresponds to the B section.

The motor flange 1 forms a bottom surface of a blower case (not shown), a rotor 2 and a stator 3 are provided on an upper surface, and a circuit case 4 is provided on a lower surface. Motor flange 1 and circuit case 4 are formed of resin.

The rotor 2 is a cylindrical container having a centrifugal fan 5 such as a sirocco fan provided on the outside, and is arranged so that a closed surface forms an upper surface and an open surface forms a lower surface. Are provided with a plurality of permanent magnets 6,
A plurality of ventilation holes 7 are formed on the upper surface. The rotor 2
A shaft hole 8 is provided at the center of the upper surface, and is fixed to an upper portion of the motor shaft 9 via the shaft hole 8. The motor shaft 9 includes the bearing 1
It is rotatably supported by the support cylinder 12 via 0,11. The support cylinder 12 is arranged upright in a hole 14 formed in the bottom surface 13a of the recess 13 of the motor flange 1 that receives the lower end thereof. The lower end of the motor shaft 9 projects into a storage chamber 26 of the circuit case 4 described later, and a sensor magnet 15 for detecting the rotor position is fixed to the projected portion.

The stator 3 includes a laminated core 16, an armature winding 17 wound around the laminated core 16, and an upper holding member 18.
And a lower holding member 19, and are arranged inside the rotor 2. The support tube 12 is disposed in the laminated core 16 so as to penetrate the central portion thereof, and the support tube 12 is fixed to the laminated core 16 by, for example, press fitting. The upper holding member 18 and the lower holding member 19 are made of resin, have holes 20, 21 for receiving the support cylinder 12, and are respectively provided at the upper and lower portions of the laminated core 16 through the holes 20, 21. 16 are held. The lower holding member 19 has an L-shaped fixing portion 19a that protrudes outward. The fixing portion 19a is fixed to the motor flange 1 so that the rotor 2
The stator 3 is held on the upper surface of the motor flange 1. Fixed portion 19a of lower holding member 19
Is fixed to the motor flange 1 by being sandwiched between the holder member 24 and the motor flange 1 via the elastic members 22 and 23. The elastic members 22 and 23 are vibration absorbing means for the rotor 2 and the stator 3.

The circuit case 4 has a storage chamber 26 in which a magnetic sensitive element 27 such as a Hall element for detecting the magnetic pole position of the sensor magnet 15 provided on the motor shaft 9, ie, the rotor position, is provided. Commutator circuit 28 including a switching element such as a power FET for controlling commutation of armature winding 17, and capacitor 29
And the like, and together with a sensor magnet 15 provided on the motor shaft 9, constitutes a brushless motor driving means. The storage chamber 26 has a two-layer structure by a resin frame 30 integrally formed with the circuit case 4 as shown in FIGS.
And a commutator circuit 28 housed therein, and a capacitor 29 is housed below. In this resin frame 30,
As will be described later, an insulating cover 39 for insulating the terminal 38 of the armature winding 17 from the aluminum substrate 31 is formed, and the terminal 38 of the armature winding 17 is connected to a control circuit. A bus bar 40 is provided.

The upper surface of the storage chamber 26 facing the lower surface of the motor flange 1 is formed of an aluminum bare chip mounting board 31 provided so as to close the upper surface of the circuit case 4. Storage room 26 of this aluminum substrate 31
A commutator circuit 28 is mounted on the side surface. The elements such as the power FET of the commutator circuit 28 are provided on the aluminum substrate 31 in a bare chip state that is not molded so that the size can be reduced. Therefore, heat generated by elements such as a power FET is sufficiently transmitted to the aluminum substrate 31. A heat sink 32 for cooling the commutator circuit 28 is provided on the outer surface of the aluminum substrate 31 opposite to the mounting surface of the commutator circuit 28. Heat sink 32
Is made of aluminum and has a flat base 32a and a base 3
A plurality of fins 32b erected in parallel with one surface of the base 2a, and the other surface of the base 32a is adhered to the aluminum substrate 31 so as to be in close contact with the substrate 31. The heat sink 32 is composed of a flat base 32a and a plurality of parallel fins 32b formed on one surface of the base 32a. For example, the heat sink 32 does not need to be formed in a special shape such as to sandwich a heating element. And cost reduction. Further, since the heat sink 32 can be provided over a wide surface of the aluminum substrate 31 on which the commutator circuit 28 is mounted, the cooling capacity can be increased. The lower surface of the storage chamber 26 is formed by a flat cover 33 provided by, for example, screws to close the lower surface of the circuit case 4.

The circuit case 4 is configured as a one-module having a control circuit having a commutator circuit 28 and the like, an aluminum substrate 31, a heat sink 32, an insulating cover 39 and a bus bar 40, and is formed on the lower surface of the motor flange 1 as described later. It is attached to the attached mounting frame 34 using fitting and screwing.

When the circuit case 4 is mounted on the motor flange 1, the lower surface of the motor flange 1 and the aluminum substrate 31 which is the upper surface of the storage chamber 26 of the circuit case 4 are provided.
, A cooling air passage 35 is formed. The cooling air passage 35 has a cooling air introduction portion 36, and the cooling air introduced from the cooling air introduction portion 36 passes between the fins 32 b of the heat sink 32 provided on the aluminum substrate 31 and blows the air through the motor flange 1. It is formed so as to be provided to the armature winding 17 through the opening 37. As shown in FIG. 2, five ventilation openings 37 are formed around the recess 13 of the motor flange 1 in this example. The blower opening 37 communicates with the cooling air passage 35 and is located below and below the armature winding 17 as shown in FIG.
Can be given to. The cooling air introduction part 36 is fixed to the motor flange 1 and the circuit case 4 by fitting in this example, and is connected to the cooling air introduction part 36 from the downstream of the blower through a connection between the pipe portion 36a and an air hose (not shown). Is supplied. Cooling air passage 35
Can be easily changed by, for example, changing the effective diameter of the pipe portion 36a of the cooling air introduction portion 36.

The armature winding 17 of the stator 3 is connected to a terminal 38. As shown in FIG. 1, the terminal 38 of the armature winding 17 is formed of a flange portion 12 a formed at a lower portion of the support cylinder 12, a bottom surface 13 a of the recess 13 of the motor flange 1, and an aluminum forming the upper surface of the circuit case 4. Substrate 31
And project into the storage chamber 26 of the circuit case 4. The terminal 38 of such an armature winding 17
As shown in FIG. 4, the insulation between the aluminum substrate 31 and the bus bar 4
0.

FIG. 4 is a diagram showing the configuration of insulation and connection of the terminals 38 of the armature winding 17 in FIG. 1. In FIG. 4, components having the same reference numerals as those in FIG. The insulating cover 39 is a cylindrical cover integrally formed with the resin frame 30 of the circuit case 4.
1a so as to protrude upward so as to penetrate therethrough.
A connection opening 41 communicating with the hollow portion 39b of the insulating cover 39 is formed through the resin frame 30 so that the terminal 38 of the armature winding 17 is connected to the hollow portion 39b of the insulating cover 39 and the connection opening 41 of the resin frame 30. And protrudes to the lower surface side of the resin frame 30. Thereby, the terminal 3 of the armature winding 17 is covered by the insulating cover 39.
Since the outer periphery of 8 is covered, the terminal 38 and the aluminum substrate 31 are reliably held in an insulated state. The bus bar 4 embedded in the resin frame 30 by insert molding is provided in the connection opening 41 of the resin frame 30.
0 is exposed, and this connection end 40a is
By being bent in a letter shape, it protrudes to the lower surface side of the resin frame 30. The terminal 38 of the armature winding 17 is electrically connected to the connection end 40a of the bus bar 40 by spot welding or soldering. The insulating cover 39 is provided so as to have clearance between the hole 31 a of the aluminum substrate 31 and the terminal 38 of the armature winding 17. This prevents contact noise between the insulating cover 39 and the aluminum substrate 31 and / or the terminals 38 of the armature winding 17 due to vibration from the motor itself or from the outside. The bus bar 40 is an elongated plate-shaped conductive member, and is provided to allow a larger motor current to flow with low heat generation. In this example, since the bus bar 40 is insert-molded in the resin frame 30 of the circuit case 4, there is no need to handle the bus bar 40 as a separate component, and the manufacturing can be facilitated.

As shown in FIG. 1, between the flange portion 12a of the support cylinder 12 and the bottom surface 13a of the concave portion 13 of the motor flange 1, in order to waterproof the penetrating portion of the terminal 38 of the armature winding 17, , A first seal member 43 is provided.
As a result, water or the like enters the storage chamber 26 of the circuit case 4 from the upper surface side of the motor flange 1, that is, the fan 5 side, through the penetrating portion of the terminal 38 of the armature winding 17 and the gap between the support cylinder 12 and the motor flange 1. To prevent intrusion. Between the lower surface of the motor flange 1 and the aluminum substrate 31 which is the upper surface of the circuit case 4, the cooling air in the cooling air passage 35 causes the clearance between the terminal 30 of the armature winding 17 and the insulating cover 39, the aluminum substrate. Through the clearance between the motor shaft 9 and the aluminum substrate 31 and the clearance between the housing 31 and the insulating cover 39,
A second seal member 44 is provided as shown in FIGS. 1 and 2 so as not to enter the inside. The second seal member 44 includes the terminal 38 of the armature winding 17 and the motor shaft 9.
Terminal 38 of the armature winding 17 and the blow opening 3
7 is provided. Thus, the cooling air introduced from the cooling air introduction unit 36 is supplied to the storage chamber 2 of the circuit case 4.
6 is supplied to the armature winding 17 from the blower opening 37 through the heat sink 32, and the circuit 28 and the armature winding 17 are cooled in series.

The mounting frame 34 on the lower surface of the motor flange 1
The terminal 38 and the blow opening 37 of the armature winding 17 are formed so as to be inside the mounting frame 34. As shown in FIG. 2, the mounting frame 34 has a fitting groove 45 formed on the entire joint surface thereof with the circuit case 4, and a projecting portion 46 a for fixing the circuit case 4 with a screw. 46b
Are formed. As shown in FIG. 3, the circuit case 4 has a fitting rib 47 that fits into a fitting groove 45 of the mounting frame 34 on a joint surface of the motor flange 1 with the mounting frame 34, and has a motor flange 1. 1 mounting frame 34
Fixing portion 48 screwed to the overhang portions 46a, 46b
a, 48b. The circuit case 4 has the fitting ribs 47 of the circuit case 4 fitted in the fitting grooves 45 of the mounting frame 34 of the motor flange 1, and the fixing portions 48 a, 4 of the circuit case 4 are fixed.
8b, the projecting portions 46a of the mounting frame 34 of the motor flange 1,
The motor flange 1 is fixed to the motor flange 1 by fixing the screw 46 to the screw 46b. In this embodiment, since the circuit case 4 is not attached to the motor flange 1 with a sealing member such as a packing, the number of parts and the number of steps can be reduced.

The lower surface of the motor flange 1 forming the cooling air passage 35 is, as shown in FIG.
1 is formed on a gentle slope so that the ventilation resistance against the cooling air from the cooling air introduction part 36 is reduced. The heat sink 32 is configured such that its fins 32b substantially contact the lower surface of the motor flange 1 from the viewpoint of reducing the size of the brushless motor. Thereby, the dimension in the height direction of the brushless motor can be reduced. Of course, the heat sink 32 is provided so that the fins 32b are parallel to the flow of the cooling air.

In such a brushless motor, the rotor position is detected by the magnetically sensitive element 27, and the commutator circuit 28 controls the commutation of the armature winding 17 of the stator 3 based on the detected position. The fan 5 is driven.

The terminal 38 of the armature winding 17 is connected to an insulating cover 39 formed integrally with the resin frame 30 of the circuit case 4.
Accordingly, the outer periphery is covered so as not to make electrical contact with aluminum substrate 31. Therefore, the insulating cover 3
9 can be reliably insulated between the terminal 38 of the armature winding 17 and the aluminum substrate 31 without attaching the component 9 as a separate component and without causing a risk of detachment due to vibration. As a result, the reliability of the product can be significantly improved, and the step of inspecting the insulation between the terminal 38 of the armature winding 17 and the aluminum substrate 31 can be omitted, and the manufacturing surface can be simplified. Can be achieved.

When the brushless motor is driven, especially the switching elements of the commutator circuit 28 generate heat.
The armature winding 17 generates heat. The switching element of the commutator circuit 28 is provided in contact with the aluminum substrate 31 with a bare chip, and the heat sink 32 is provided in close contact with the aluminum substrate 31, so that the heat generated by the commutator circuit 28 is provided in the cooling air passage 35. Sufficiently transmitted to the heat sink 32. The cooling air introduced from the cooling air introduction unit 36 is supplied to the heat sink 3
Since the heat sink 32 passes through the space between the two fins 32b and escapes to the blow opening 37, the heat sink 32 is sufficiently cooled.
That is, sufficient cooling can be provided to the commutator circuit 28. Since the cooling air is prevented from entering the storage chamber 26 of the circuit case 4 by the second seal member 44, moisture, dust, and the like do not enter the storage chamber 26 due to the cooling air. The cooling air flowing out of the blower opening 37 is supplied to the armature winding 17 and actively cools the armature winding 17, and then flows into the blower case by the rotation of the fan 5. As described above, since the armature winding 17 is actively cooled together with the commutator circuit 28, copper loss can be reduced and motor efficiency can be improved.

FIG. 5 is a diagram showing another example of the connection configuration of the terminal 38 of the armature winding 17 in FIG. 1, and the same reference numerals as in FIG. 4 denote the same components. In the present example, a female portion into which the terminal 38 of the armature winding 17 is inserted and connected is formed by the connection end portion 53a of the bus bar 53 and the resin surface 41a of the connection opening 41 of the resin frame 30 facing the connection end portion 53a. The terminal 38 of the armature winding 17 can be used without using soldering.
Are connected to the bus bar 53.

The bus bar 53 is embedded in the resin frame 30 of the circuit case 4 by insert molding, and the connection end 53 a exposed at the connection opening 41 is connected to the armature winding 17.
The terminal 38 is bent obliquely in the insertion direction C of the terminal 38. The resin surface 41a of the connection opening 41 is a bent bus bar 5
3 is formed so as to face the connection end 53 a of the bus bar 53.
As a result, the terminal 3 of the armature winding 17 is
A female portion into which the connector 8 is inserted and connected is formed. Bus bar 5
The distance between the connection end 53a of the third armature 3 and the resin surface 41a of the connection opening 41 is wide at the entrance side of the armature winding 17 where the terminal 38 is inserted, becomes narrower in the insertion direction C, and the terminal 38 protrudes. The outlets are configured to be substantially in contact with each other. This facilitates the insertion of the terminal 38 when the terminal 38 of the armature winding 17 is inserted between the connection end 53a and the resin surface 41a. Further, since the connection end 53a of the bus bar 53 is bent obliquely, the bus bar 53
Can effectively be used, and the terminal 38 of the inserted armature winding 17 is more strongly held between the connection end 53a and the resin surface 41a by the elasticity of the bus bar 53. Therefore, the reliability of the connection between the terminal 38 of the armature winding 17 and the bus bar 53 can be improved.

According to this embodiment, the terminal 38 of the armature winding 17
Is sandwiched between the connection end 53a and the resin surface 41a by the elasticity of the bus bar 53 without being welded or soldered to the bus bar 53. Therefore, the steps of welding and soldering become unnecessary, and the connection to the bus bar 53 can be achieved only by inserting the terminal 38 of the armature winding 17. Also,
Since the terminal 38 of the armature winding 17 is not fixed to the bus bar 53 by welding or soldering, it is easy to attach and detach the terminal 38 of the armature winding 17 at the time of repair or the like. In addition, vibration from the outside causes the connection end 53 of the terminal 38 and the bus bar 53 to be connected.
This is absorbed by a positional shift between the position "a" and the position "a", and the occurrence of a disconnection state is prevented, so that the vibration resistance can be improved. Furthermore, since the connection end 53a of the bus bar 53 only needs to be bent obliquely and does not need to be bent into a complicated shape, the thickness of the bus bar 53 can be increased, and the heat generation can be further reduced. .

FIG. 6 is a diagram showing still another example of the connection configuration of the terminals 38 of the armature winding 17 in FIG. 1, and the components having the same reference numerals as those in FIG. 5 indicate the same components. In this example, the bus bar 54
Are fixed to the lower surface of the resin frame 30 with screws or the like without being insert-molded in the resin frame 30, and the connection end 54 a of the bus bar 54 that is obliquely bent in the insertion direction C of the terminal 38 of the armature winding 17. And resin frame 3
The female portion of the terminal 38 of the armature winding 17 is formed by the resin surface 41a of the connection opening 41 of the zero. Other configurations are the same as those described with reference to FIG. 5, and the same effects as in FIG. 5 can be obtained by this example.

FIG. 7 is a sectional view of a main part showing another example of the embodiment of the present invention, in which the same reference numerals as those in FIG. 1 denote the same parts. In this example, the insulating cover 60 is formed integrally with the bottom surface 13a of the recess 13 of the motor flange 1 and has a lower end surface 60a.
a projects downward so as to penetrate the hole 31a of the aluminum substrate 31. The bottom surface 13a of the recess 13 communicates with the hollow portion 60b of the insulating cover 60, and the armature winding 17
Terminal 38 passes through the bottom surface 13 a of the recess 13 and the hollow portion 60 b of the insulating cover 60 and is inserted into the connection opening 61 formed in the resin frame 30 of the circuit case 4. Thus, the terminal 38 of the armature winding 17 is formed by the insulating cover 60 formed integrally with the motor flange 1.
Is covered, and the terminal 38 and the aluminum substrate 31 are reliably insulated from each other. Insulation cover 60
Is the aluminum substrate 31 and / or the armature winding 1
7 so as not to make contact noise with the terminal 38 of the armature winding 17 and the hole 31a of the aluminum substrate 31.
Is provided so as to have a clearance with the terminal 38. In the connection opening 61 of the resin frame 30, FIG.
As described above, the female portion is formed by the connection end portion 62a of the bus bar 62 insert-molded in the resin frame 30 and the resin surface 61a of the connection opening 61 facing the connection end portion, and the terminal of the armature winding 17 is formed. 38 is inserted and connected. Other configurations are as described in the previous example.

FIG. 8 is a cross-sectional view of a principal part showing still another example of the embodiment of the present invention. In this example, the insulating cover 70 is
Is formed integrally with a resin-made lower holding member 19 that holds the wound laminated core 16, and a lower end surface 70 a thereof has a hole 12 b of a flange portion 12 a of the support cylinder 12 and a bottom surface 13 a of a recess 13 of the motor flange 1. Through the hole 13b of the aluminum substrate 31 so as to penetrate downward. The terminal 38 of the armature winding 17 is
The circuit case 4 is inserted into a connection opening 61 formed in the resin frame 30 of the circuit case 4 through the hollow portion 70b. As a result, the outer periphery of the terminal 38 of the armature winding 17 is covered by the insulating cover 70 formed integrally with the lower holding member 19, and the terminal 38 and the aluminum substrate 31 are reliably insulated. I have. Insulation cover 7
0 is a distance between the support cylinder 12, the motor flange 1 and the hole 12b of the flange portion 12a of the support cylinder 12 so that no contact sound is generated between the support cylinder 12, the aluminum substrate 31 and / or the terminal 38 of the armature winding 17. , Recess 1 of motor flange 1
3 between the bottom surface 13a and the hole 13b of the aluminum substrate 3
It is provided so as to have a clearance between the first hole 31 a and the terminal 38 of the armature winding 17. Other configurations are as described in FIG.

[0027]

As described above, according to the present invention, an armature is provided so as not to make electrical contact with a conductive circuit board by an insulating cover integrally formed on a resin component constituting a brushless motor. Since the outer periphery of the winding terminals is covered, insulation between the armature winding terminals and the conductive circuit board can be reliably achieved without increasing the number of parts and the number of steps. , The reliability of the product can be improved. Further, it is possible to omit the step of inspecting the insulation between the terminals of the armature windings and the conductive circuit board, and to further simplify the manufacturing surface.

Also, clearances are provided between the insulating cover and the terminals of the armature windings and between members through which the insulating cover penetrates. It is possible to prevent or reduce the generation of contact noise with the terminal of the armature winding and / or the penetrating member.

A female portion into which the terminal of the armature winding is inserted and connected is formed in the connection opening formed in the resin frame by the connection end of the bus bar and the resin surface of the connection opening facing the bus bar. When the terminal of the slave winding is inserted and connected, the terminal is sandwiched between the connection end of the bus bar and the resin surface of the connection opening, so that a welding or soldering process is not required, thereby simplifying manufacturing. Further, cost reduction and the like can be achieved. Further, since the terminals of the armature winding are not fixed to the bus bar by welding or soldering, it is easy to attach and detach the terminal of the armature winding at the time of repair or the like. In addition, since vibration from the outside is absorbed by a displacement between the terminal and the connection end of the bus bar, it is possible to prevent a disconnection state,
Vibration resistance can be improved. Furthermore, since the connection end of the bus bar only needs to be bent obliquely and does not need to be bent into a complicated shape, the thickness of the bus bar can be increased, and the heat generation can be further reduced.

Further, since the bus bar is embedded in the resin frame by insert molding, it is not necessary to handle the bus bar as a separate part, and the manufacturing can be facilitated.

Further, the terminal of the armature winding is sandwiched between the bent connection end of the bus bar and the resin surface of the connection opening opposed thereto, so that the elasticity of the bus bar can be effectively used. Thus, the reliability of the connection between the terminal and the bus bar can be improved.

Further, a cooling air passage for supplying cooling air to the outer surface of the circuit board forming the upper surface of the storage chamber and the armature winding is formed, and the control circuit can be cooled by cooling the outer surface of the circuit board. Not only that, the armature windings can be actively cooled and the terminals connected to the armature windings can be reduced in heat generation. As a result, the operation with a larger motor current becomes possible, and the operation range of the brushless motor can be expanded.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment of the present invention.

FIG. 2 is a diagram showing a lower surface side of a motor flange in FIG. 1;

FIG. 3 is a diagram showing a cross section taken along line AA of FIG. 2;

FIG. 4 is a diagram showing an insulation and connection configuration of terminals of an armature winding in FIG. 1;

FIG. 5 is a diagram showing another example of the connection configuration of the terminals of the armature winding in FIG. 1;

FIG. 6 is a diagram showing still another example of the connection configuration of the terminals of the armature winding in FIG. 1;

FIG. 7 is a fragmentary cross-sectional view showing another example of the embodiment of the present invention.

FIG. 8 is a cross-sectional view of a main part showing still another example of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor flange 4 Circuit case 17 Armature winding 19 Lower holding member (holding member) 26 Storage room 31 Bare chip mounting board (conductive circuit board) 35 Cooling air passage 37 Ventilation opening 38 Armature winding terminal 39, 60 , 70 Insulating cover 30 Resin frame 40, 53, 54, 62 Bus bar 40a, 53a, 54a, 62a Bus bar connection end 41, 61 Connection opening 41a, 61a Resin surface of connection opening

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H019 AA10 CC04 DD01 DD10 EE09 GG01 5H604 AA08 BB10 BB12 BB15 BB17 CC01 CC05 CC11 DB01 PC03 QA08 QB03 QB04 5H605 AA08 BB05 BB19 CC02 CC03 CC06 EA02 EC05 GG18

Claims (9)

[Claims] A storage chamber having a conductive circuit board; a terminal of an armature winding penetrating through the circuit board and protruding into the storage chamber; and a resin component constituting a brushless motor. A brushless motor comprising: an insulating cover that covers an outer periphery of the armature winding terminal so that a terminal of the armature winding penetrating the circuit board does not electrically contact the circuit board. 2. The brushless motor according to claim 1, wherein said circuit board is a bare chip mounting board made of aluminum. 3. The armature winding is held on one surface,
A motor flange provided with the housing chamber on the other surface, the circuit board forming an upper surface of the housing room facing the other surface of the motor flange, and a terminal of the armature winding being the motor The brushless motor according to claim 1, wherein the brushless motor projects through the flange and the circuit board and projects into the storage chamber. 4. The resin component constituting the brushless motor is the motor flange, a circuit case forming the storage chamber, or a holding member for holding the armature winding on the motor flange. The insulating cover is a cylindrical cover formed to protrude from the motor flange, the circuit case, or the holding member so as to penetrate the circuit board.
A brushless motor. 5. The brushless motor according to claim 4, wherein the insulating cover has a clearance between a terminal of the armature winding and a member through which the insulating cover penetrates. 6. A bus bar provided on a resin frame in the storage chamber and connecting a terminal of the armature winding projecting into the storage chamber through the circuit board to a control circuit, the bus bar being provided on the resin frame. A connection opening into which the terminal of the armature winding is inserted, a connection end of the bus bar connected to the terminal of the armature winding and a resin surface of the connection opening facing the connection opening. Forming a female portion to which the terminal of the armature winding is inserted and connected, and the terminal of the armature winding is connected to the connection end of the bus bar when the terminal of the armature winding is inserted and connected. The brushless motor according to claim 1, wherein the brushless motor is held between the connection opening and a resin surface. 7. The brushless motor according to claim 6, wherein said bus bar is embedded in said resin frame by insert molding. 8. The connection end of the bus bar is bent in the insertion direction of the terminal of the armature winding so that the resin surface of the connection opening faces the bent connection end of the bus bar. 8. The brushless motor according to claim 6, wherein the terminal of the armature winding is formed and held between a bent connection end of the bus bar and a resin surface of the connection opening. 9. 9. A cooling air passage formed between the other surface of the motor flange and an upper surface of the housing chamber, the cooling air passage not communicating with the housing chamber, wherein the cooling air passage is provided by the armature. The armature winding communicates with the armature winding through at least one ventilation opening formed in the motor flange so as to substantially face the winding, and the cooling air supplied to the cooling air passage forms the upper surface of the storage chamber. 4. The brushless motor according to claim 3, wherein the brushless motor is provided to the armature winding through an outer surface of a circuit board.