JP2010166647A - Claw pole type motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a claw pole type motor which cools directly a coil by cooling oil. <P>SOLUTION: In the claw pole type motor 16, in which a ring-shaped coil 4 is caught with an upper core 2 and a lower core 6 where claws are created respectively, a cooling oil passage 1c is formed by the first insulator 3 installed between the ring-shaped coil 4 and the upper core 2 and the second insulator 5 installed between the ring-shaped coil 4 and the lower core 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a claw pole type motor that holds a ring-shaped coil between an upper core and a lower core each having a claw.

A motor or a generator mounted on a vehicle such as an automobile has a rotor (rotor) and a stator core disposed around the stator and wound with a stator winding. The motor energizes the stator windings to obtain rotational force, and the generator extracts the current flowing through the stator windings by the rotation of the rotor. When a current flows through the stator winding during the rotation of the rotor, the stator core and the stator winding generate heat. If the temperature of the stator core and the coil rises excessively after leaving such heat generation, the enamel coating coated on the coil wiring, the insulation failure to ensure the insulation between the coil and the stator, the stator coil And problems such as thermal demagnetization of permanent magnets may occur.
Therefore, it is necessary to quickly dissipate the heat generated by the stator core and the coil.

Conventionally, there is an invention described in Patent Document 1 as a claw pole type motor. The claw pole type motor 100 of Patent Literature 1 includes a rotor and a coil that is a stator winding disposed around the rotor. The coil is accommodated in the stator ring.
As a means for cooling the coil of the claw pole type motor 100, conventionally, air cooling like a cooling fin has been performed. However, cooling performance is lower in air cooling than in water cooling or oil cooling. Therefore, a method having a high cooling performance with an inexpensive implementation method has been desired.

In the edgewise type concentrated winding motor other than the claw pole type motor, there is an invention described in Patent Document 2. In the edgewise concentrated winding motor 200 of Patent Document 2, in order to quickly radiate the heat of the stator core and the coil, a means for radiating heat with cooling oil has been adopted.
The edgewise concentrated winding motor 200 has a coil attached to twelve tee scores. The coil is molded with resin after being connected to the tee score. The resin mold is provided with a cooling oil passage that is a groove so that the cooling oil reaches the coil. When cooling the coil of the edgewise concentrated winding motor, the coil could be cooled by flowing the cooling oil directly into the cooling oil passage.

JP 2005-20981 A JP 2006-197774 A JP 2007-336677 A JP-A-7-227075 JP-A-5-227700

However, in the edgewise concentrated winding motor 200 according to the conventional Patent Document 2, there is a problem that it is difficult to guide the cooling oil passage to the inside of the coil because the structure is complicated.
Further, in the claw pole type motor 100 according to Patent Document 1, since it is not wound in the coil axis direction unlike the edgewise type concentrated winding motor 200, a method of providing a cooling oil flow path has not been adopted.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a claw pole type motor provided with a cooling oil passage.

In order to achieve the above object, a claw pole type motor according to the present invention has the following configuration.
(1) In a claw pole type motor that holds a ring-shaped coil between an upper core and a lower core each having a claw, a first insulator mounted between the ring-shaped coil and the upper core, and the ring-shaped coil A cooling oil flow path is formed by the second insulator mounted between the lower core and the lower core.
(2) In the claw-pole motor described in (1), the supply port and the discharge port of the cooling oil passage are formed by the first insulator and the second insulator, and the motor uses the output shaft in the horizontal direction. The supply port and the discharge port are arranged at the highest position.
(3) The claw pole type motor described in (1) or (2) is characterized in that the ring-shaped coil is disposed so as to be overlapped via a spacer.
(4) In any one of the claw pole type motors described in (1) to (3), the ring-shaped coil is arranged so as to overlap the U phase, the V phase, and the W phase, The U-phase cooling oil passage, the V-phase cooling oil passage, and the W-phase cooling oil passage are connected by a supply port and a discharge port.

The operation and effect of the claw pole type motor will be described.
(1) A cooling oil flow path is formed by the first insulator mounted between the ring-shaped coil and the upper core and the second insulator mounted between the ring-shaped coil and the lower core. The ring coil can be directly cooled by the cooling oil. Moreover, since the cooling oil flow path is formed over the entire circumference of the ring-shaped coil, it can be cooled to every corner along the entire circumference of the ring-shaped coil.
Moreover, since the cooling oil flow path is formed in the insulator using the resinous insulator, the cooling oil flow path of the ring-shaped coil can be easily formed, so that the cost can be reduced.
(2) The supply port and the discharge port of the cooling oil passage are formed by the first insulator and the second insulator, the motor uses the output shaft in the horizontal direction, and the position where the supply port and the discharge port are the highest Therefore, when the cooling oil is flowed, the cooling oil flows downward due to gravity, and accumulates below, and then circulates and flows to the discharge port. Therefore, it can cool naturally to every corner of the ring-shaped coil.
Further, since the cooling oil can be flowed from a high position, it is not necessary to increase the pressure in the cooling oil flow path, so that the amount of leakage can be reduced.
(3) Since the ring-shaped coil is disposed so as to be overlapped via the spacer, the inside, where heat is not easily transmitted, can be cooled by the cooling oil.
(4) The ring-shaped coil is arranged so as to overlap the U phase, the V phase, and the W phase, and the U phase cooling oil passage, the V phase cooling oil passage, and the W phase cooling oil passage are provided. By being connected by the supply port and the discharge port, by flowing the cooling oil into one phase, it flows into the other two phases, so that the work can be reduced.

An exploded perspective view of U phase stack 1 is shown. An external perspective view of the U-phase stack 1 is shown. FIG. 3 shows an AA cross-sectional view of the U-phase stack 1 of FIG. 2. An exploded perspective view of the claw pole type motor 16 is shown. An external perspective view in which a U-phase stack 1, a V-phase stack 11, and a W-phase stack 12 are arranged is shown. The external appearance perspective view in the state where the 1st insulator 23 and the 2nd insulator 25 were joined is shown. An external perspective view of the U-phase stack 21 is shown. A configuration in which the discharge port 21b of the U-phase stack 21 and the supply port 31a of the V-phase stack 31 are connected by the piping 33, and a configuration in which the discharge port 31b of the V-phase stack 31 and the supply port 32a of the W-phase stack 32 are connected by the piping 34. A simplified diagram is shown. FIG. 8 is a BB sectional view of the U-phase stack 21 in FIG. 7.

Next, an embodiment of a claw pole type motor according to the present invention will be described with reference to the drawings.
(First embodiment)
<Overall configuration of U-phase stack>
Before explaining the overall configuration of the claw pole type motor 16 according to the present invention shown in FIG. 4, the U phase stack 1 which is a part of the claw pole type motor 16 which is the main part of the present invention will be described first. Do.
FIG. 1 shows an exploded perspective view of the U-phase stack 1. FIG. 2 is an external perspective view of the U-phase stack 1. FIG. 3 shows an AA cross-sectional view of the U-phase stack 1 of FIG.
As shown in FIG. 1, the U-phase stack 1 includes an upper core 2, a first insulator 3, a ring-shaped coil 4, a second insulator 5, and a lower core 6. The ring-shaped coil 4 is sandwiched between the first insulator 3 and the second insulator 5, and the first insulator 3, the ring-shaped coil 4, and the second insulator 5 are assembled by being sandwiched between the upper core 1 and the lower core 6. Thus, the U-phase stack 1 is completed.
The ring-shaped coil 4 is for generating a magnetic field, and is obtained by winding an electric wire having a flat cross-sectional shape around a coil. The ring-shaped coil 4 has a hollow cylindrical shape.
The first insulator 3 has a hollow cylindrical shape. The first insulator 3 is formed by flattening a resin which is an insulator. As shown in FIG. 3, a cooling oil flow path 3 c that can include the ring-shaped coil 4 is formed at a portion where the first insulator 3 is in contact with the ring-shaped coil 4. Further, a supply port 3 a and a discharge port 3 b are formed at one end of the first insulator 3. As shown in FIG. 3, a flow path is formed on the ring-shaped coil 4 side of the supply port 3a, and the flow path communicates with the cooling oil flow path 3c. The discharge port 3b is not shown in FIG. 3, but adopts the same configuration.
Since the shape of the 2nd insulator 5 takes the same structure as the 1st insulator 3, description is omitted.

As shown in FIG. 1, the first insulator 3 and the second insulator 5 sandwich the ring-shaped coil 4 in order to interrupt the current of the ring-shaped coil 4 so that it does not flow excessively.
As shown in FIG. 3, when the first insulator 3 and the second insulator 5 are joined, the cooling oil passage 3c is formed by the cooling oil passage 3c and the cooling oil passage 5c. At the portion where the first insulator 3 and the second insulator 5 are joined, the first insulator 3 and the second insulator 5 both form the acute angle surfaces 3d and 5d. The area where the second insulator 5 is joined is large. As shown in FIG. 3, the first insulator 3 is formed so that the portion where the acute angle surface 3 d is formed enters the second insulator 5 side from the center as compared with the second insulator 5. . The portion related to the acute angle surface 3d is open toward the outer side to push out the acute angle surface 5d.
The cooling oil channel 1c (comprised of the cooling oil channel 3c and the cooling oil channel 5c) is a hollow channel, and the ring-shaped coil 4 is disposed in the channel.

The upper core 2 is made of powdered powder made of iron powder and resin. The compacted powder is obtained by solidifying a magnetic material into a fine powder by pressure.
As shown in FIG. 1, the upper core 2 is composed of an outer periphery 2A having a hollow cylindrical shape and a claw teeth 2B formed on an inner peripheral wall of the outer periphery 2A. There is an upper surface 2Aa on the circumference at the top of the cylindrical shape of the outer periphery 2A. Twelve of the crotches 2B are formed on the inner peripheral wall at equal intervals and equal widths. Between the claw teeth 2B formed at equal intervals, the recesses 2C are also formed at twelve locations at equal intervals and equal widths.
As for the shape of the claw teeth 2B, the upper surface 2Ba is connected to the upper surface 2Aa, and is connected to the upper end of the upper surface 2Aa to form a flat plate. The inner peripheral surface 2Bb descends from the upper surface 2Ba in the vertical direction. The lower end portion of the inner peripheral surface 2Bb that is opposite to the upper end portion that is bonded to the upper surface 2BA of the inner peripheral surface 2Bb and the tapered surface 2Bc are bonded. The tapered surface 2Bc is inclined in an acute angle direction from the inner peripheral surface 2Bb in the direction of the outer peripheral surface 2A. An insulator joint surface 2Bd is formed between the outer circumference 2A and the tapered surface 2Bc in parallel with the upper surface 2Ba. Each side surface 2Be is formed on both side surfaces of the crotches 2B.
The upper core 2 has a supply port 1a (consisting of a supply port 3a and a supply port 5a) and a discharge port 1b (consisting of a discharge port 3b and a discharge port 5b) of the U-phase stack 1 shown in FIG. Notches 2a and 2b are formed at locations corresponding to. The notches 2a and 2b are formed in the periphery where the insulator joint surface 2Bd, which is the root of the claw teeth 2B having a low magnetic flux density, and the outer periphery 2A are joined so as not to affect the performance of the motor. The cutout portion 2a is formed in a shape in which a supply port 3a which is a half of the supply port 1a enters. Moreover, the notch part 2b is also formed in the form into which the discharge port 3b which is a half of the discharge port 1b enters.
The lower core 6 has the same configuration except that the direction of the lower core 6 is opposite to that of the upper core 2, and the description thereof is omitted.

As shown in FIG. 1, the first insulator 3, the ring-shaped coil 4, and the second insulator 5 are sandwiched, and the upper core 2 and the lower core 6 are further sandwiched. The crotice 2B of the upper core 2 enters the recess 6C of the lower core 6, and the crotice 6B of the lower core 6 enters the recess 2C of the upper core 2. Thereby, as shown in FIG. 2, the upper core 2 and the lower core 6 can be joined without interfering with each other.
The first insulator 3 is joined to the insulator joint surface 2Bd of the upper core 2, and the second insulator 5 is joined to the insulator joint surface 6Bd of the lower core 6. When the first insulator 3 and the second insulator 5 are joined to the upper core 2 and the lower core 6 and pressed, the first insulator 3, the ring-shaped coil 4, and the second insulator 5 are in close contact with each other.

<Configuration of Claw Pole Motor According to First Embodiment>
FIG. 4 is an exploded perspective view of the claw pole type motor 16.
The claw pole motor 16 includes a U-phase stack 1, a V-phase stack 11, a W-phase stack 12, a bracket 13, and a fastening bracket 14. Since the V-phase stack 11 and the W-phase stack 12 have the same configuration as that of the U-phase stack 1 described above, description thereof is omitted.
An output shaft 10 is formed at the center of the bracket 13, and a rotor 9 is formed at the outer periphery thereof. The rotor 9 is inserted through the hollow portions of the U-phase stack 1, V-phase stack 11, and W-phase stack 12, and is superimposed on the U-phase stack 1, V-phase stack 11, W-phase stack 12, and bracket 13 from above. Yes. A fastening bracket 14 is fastened to the bracket 13 from above the U-phase stack 1. The fastening bracket 14 is fastened by inserting a fastening bolt 15A or the like into the fastening hole 13A or the like.

<Operation and Effect of Claw Pole Motor According to First Embodiment>
For example, the claw pole type motor 16 is attached to an automobile using a hybrid motor. The claw pole type motor 16 is installed so that the output shaft 10 faces sideways. When installing, it installs so that the supply port 1a and the discharge port 1b may be symmetrically arrange | positioned in the highest upper position.
When the claw pole type motor 16 is operated, the ring coil 4 generates heat. In order to cool the entire ring-shaped coil 4 of the U-phase stack 1, cooling oil 8 is poured into the supply port 1a. When the cooling oil 8 is poured into the supply port 1a, the pressure of the cooling oil passage 1c is increased. This is because the cooling oil 8 that has entered from the supply port 1a flows to the discharge port 1b by increasing the pressure. The cooling oil 8 that has flowed into the cooling oil passage 1c through the supply port 1a flows downward due to gravity, and accumulates below, and then circulates and flows to the discharge port 1b due to pressure. When the cooling oil 8 flows through the cooling oil passage 1c, the ring-shaped coil 4 that has come into contact with the cooling oil 8 is cooled. Further, since the cooling oil passage 1 c is formed over the entire circumference of the ring-shaped coil 4, it can be cooled to every corner along the entire circumference of the ring-shaped coil 4.
Moreover, since the cooling oil 8 can be flowed from a high position, it flows downward by its own weight, and the cooling oil 8 flows without increasing the pressure in the cooling oil passage 1c. Since it is not necessary to increase the pressure in the cooling oil flow path 1c, the pressure in the cooling oil flow path 1c decreases, and the amount of cooling oil 8 leaking from the gap between the first insulator 3 and the second insulator 5 is reduced. be able to.
As shown in FIG. 3, since the spacer 7 is fitted in the center of the ring-shaped coil 4, an appropriate gap is secured between the ring-shaped coils 4, and the cooling oil 8 can be circulated. The inner peripheral portion of the ring-shaped coil 4 is particularly susceptible to heat generation due to an alternating current and copper loss. Therefore, the cooling oil is directly inserted into the central portion of the ring-shaped coil 4 that easily generates heat when the spacer 7 is inserted. Since 8 can be touched, the cooling efficiency can be increased.

In the state shown in FIG. 5, when the U-phase stack 1, the V-phase stack 11, and the W-phase stack 12 are overlapped, the respective supply ports and discharge ports are communicated by a common flow path. The cooling oil 8 can be supplied to all the U-phase stack 1, the V-phase stack 11, and the W-phase stack 12 by the process of supplying the cooling oil 8.
For example, piping leading to the supply source of the cooling oil 8 is piping to the supply ports 1a, 11a, and 12a. In addition, piping that leads to the discharge port for the cooling oil 8 is connected to the discharge ports 1b, 11b, and 12b. Accordingly, the cooling oil 8 can be supplied to all the U-phase stack 1, the V-phase stack 11, and the W-phase stack 12 at a time by supplying the cooling oil 8 from the supply source. Further, the cooling oil 8 can be discharged from all the U-phase stack 1, the V-phase stack 11, and the W-phase stack 12 at a time.

Further, a pipe leading to the supply source of the cooling oil 8 is connected to the supply port 1a, a pipe from the discharge port 1b is connected to the supply port 11a, a pipe from the discharge port 11b is connected to the supply port 12a, and the discharge port Pipe the pipe from 12b to the pipe leading to the outlet. As a result, when the cooling oil 8 is supplied from the supply source, the cooling oil 8 that has circulated through the U-phase stack 1 first circulates through the V-phase stack 11, and circulates through the W-phase stack third. And can flow to the outlet.
Therefore, it is not necessary to flow the cooling oil 8 to all of the U-phase stack 1, the V-phase stack 11, and the W-phase stack 12, and the three cooling rings 8 only cool one of the ring-shaped coils 4. The coil 4 can be cooled. Since the cooling oil 8 is expensive, the cost can be reduced.
Moreover, since the cooling oil 8 flows into the other two phases by flowing the cooling oil 8 into one phase, the work can be reduced.

As explained in detail above, according to the above embodiment,
(1) In a claw pole type motor 16 that clamps the ring-shaped coil 4 between the upper core 2 and the lower core 6 each having a claw, the first coil is mounted between the ring-shaped coil 4 and the upper core 2. Since the cooling oil flow path 1c is formed by the insulator 3 and the second insulator 5 mounted between the ring-shaped coil 4 and the lower core 6, the ring-shaped coil 4 is formed by the cooling oil 8. Can be cooled directly. Further, since the cooling oil passage 1 c is formed over the entire circumference of the ring-shaped coil 4, it can be cooled to every corner along the entire circumference of the ring-shaped coil 4.
Moreover, since the cooling oil flow path 1c is formed using the insulator, the cooling oil flow path 1c of the ring-shaped coil 4 can be easily manufactured, so that the production efficiency can be increased.
(2) Further, the supply port 1a and the discharge port 1b of the cooling oil passage 1c are formed by the first insulator 3 and the second insulator 5, and the claw pole type motor 16 uses the output shaft 10 in the horizontal direction. Since the supply port 1a and the discharge port 1b are arranged at the highest position, when the cooling oil 8 is flowed, the cooling oil 8 flows downward due to gravity and accumulates below, and then goes to the discharge port 16b. It circulates and flows. Therefore, it can cool naturally to every corner of the ring-shaped coil 4.
(3) Further, since the ring-shaped coil 4 is disposed so as to be overlapped via the spacer 7, it is difficult for heat to be transmitted, and the inside can be cooled by the cooling oil 8.
(4) The ring-shaped coil 4 is disposed so as to overlap the U phase, the V phase, and the W phase, and the U phase cooling oil passage 1c, the V phase cooling oil passage 11c, and the W phase cooling oil. Since the flow path 12c is connected by the supply port and the discharge port, by flowing the cooling oil 8 into one phase, it flows into the other two phases, so the work can be reduced.

(Second Embodiment)
<Configuration of Claw Pole Motor According to Second Embodiment>
The claw pole type motor in the second embodiment is different from the claw pole type motor in the first embodiment only in the positions of the supply port and the discharge port in the U-phase stack 1, the V-phase stack 11, and the W-phase stack 12. Therefore, explanation of other common parts is omitted.
In FIG. 6, the external appearance perspective view of the state which the 1st insulator 23 and the 2nd insulator 25 were joined is shown. A supply port 23a is formed in the upper surface 23b of the first insulator 23 in a direction perpendicular to the upper surface 23b. A discharge port 25a is formed in the upper surface 25b of the second insulator 25 in a direction perpendicular to the upper surface 25b.
FIG. 7 shows an external perspective view of the U-phase stack 21. FIG. 7 shows a state in which the upper core 22 and the lower core 26 are sandwiched between the states of FIG. The difference between the upper core 2 and the upper core 22 of the first embodiment is that the upper core 22 does not have the notches 2a and 2b. The difference between the lower core 26 is that it does not have the notches 6a and 6b. Since it is not necessary to have the notch portion, the step of forming the notch portion is not required, and therefore the step of forming the upper core 22 and the lower core 23 can be simplified.
In the second embodiment, as shown in FIG. 7, the supply port 23a of the U-phase stack 21 is different from the U-phase stack 1 of the first embodiment in that it is formed horizontally in the axial direction. Although not shown in FIG. 7, the discharge port 25a of the U-phase stack 21 is also different from the U-phase stack 1 of the first embodiment in that it is formed horizontally in the axial direction.
FIG. 9 shows a BB cross-sectional view of the U-phase stack 21 of FIG. As shown in FIG. 9, when the first insulator 23 and the second insulator 25 are joined, a cooling oil passage 21c is formed by the cooling oil passage 23c and the cooling oil passage 25c. The cooling oil passage 21c is a hollow passage, and the ring-shaped coil 4 is present in the passage.

<Operation and Effect of Claw Pole Motor According to Second Embodiment>
In FIG. 8, the discharge port 25b of the U-phase stack 21 and the supply port 31a of the V-phase stack 31 are connected by a pipe 33, and the discharge port 31b of the V-phase stack 31 and the supply port 32a of the W-phase stack 32 are connected by a pipe 34. The connected structure is shown. In FIG. 8, since the U-phase stack 21, the V-phase stack 31, and the W-phase stack 32 are originally overlapped, the pipes 33 and 34 are not as long as shown in the figure. 33 and 34 are shown long.
By adopting the configuration shown in FIG. 8, when the cooling oil 8 is supplied from the supply source, the cooling oil 8 that has circulated through the U-phase stack 21 first circulates through the V-phase stack 31, and 3 The W-phase stack 32 can be circulated to the outlet and flow to the discharge port 32b. Therefore, it is not necessary to flow the cooling oil 8 to all the U-phase stack 21, the V-phase stack 31, and the W-phase stack 32. 4 can be cooled. Since the cooling oil 8 is expensive, the cost can be reduced.
Moreover, since the cooling oil 8 flows into the other two phases by flowing the cooling oil 8 into one phase, the work can be reduced.

As described above in detail, according to the second embodiment, in addition to the effects of the first embodiment, the step of forming the notch is not required because the notch is not required. Therefore, the process of forming the upper core 22 and the lower core 23 can be simplified.
Moreover, when the supply source which inserts the cooling oil 8 cannot be installed in the upward direction, according to the second embodiment, the supply source can be installed in the horizontal axis direction, and the cooling oil 8 can be supplied.

  Note that the present invention is not limited to the above-described embodiment, and various applications are possible without departing from the spirit of the invention.

1 U-phase stack 1a Supply port 1b Discharge port 1c Cooling oil flow path 2 Upper core 3 First insulator 4 Ring coil 5 Second insulator 6 Lower core 7 Spacer 11 V-phase stack 12 W-phase stack 16 Claw pole type motor

Claims (4)

In a claw pole type motor that sandwiches a ring-shaped coil between an upper core and a lower core each formed with a claw,
A cooling oil flow path is formed by the first insulator mounted between the ring-shaped coil and the upper core and the second insulator mounted between the ring-shaped coil and the lower core. Claw pole type motor characterized by In the claw pole type motor according to claim 1,
A supply port and a discharge port of the cooling oil passage are formed by the first insulator and the second insulator;
The motor has an output shaft used in a horizontal direction, and the supply port and the discharge port are arranged at the highest position. In the claw pole type motor according to claim 1 or 2,
A claw-po type motor, wherein the ring-shaped coil is disposed so as to overlap each other via a spacer. In any one of the claw pole type motors according to claim 1 to claim 3,
The ring-shaped coil is disposed so as to overlap the U phase, the V phase, and the W phase, and the U phase cooling oil passage, the V phase cooling oil passage, and the W phase cooling oil passage include A claw paw motor connected by a supply port and the discharge port.

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