JP2006320054A - Stator member for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator for a motor which can be cooled effectively and besides can be manufactured easily. <P>SOLUTION: A stator body 10 is manufactured by molding dust core material. A groove (for example, a spiral groove) is made at the peripheral face of the stator body 10, and it is accommodated in a lower casing 20 and is used as a refrigerant passage. Then, a refrigerant such as water or the like flows in the refrigerant passage via pipes 24 and 26. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stator for a motor using a dust core material, and more particularly to a cooling structure thereof.

  Conventionally, a high-power motor has a structure for cooling the motor in order to solve the problem due to heat generation. In particular, in order to increase the cooling capacity, it is effective to cool a motor (usually a stator) by flowing a coolant such as water into the motor.

  For example, in patent document 1, the fin member which formed the fin in the outer peripheral surface as a different body from a stator is provided, and this fin member is attached to the outer side of a stator. And the stator is cooled via a fin by making the outer side of a fin member into a refrigerant flow path.

JP 2003-247628 A

  However, in the motor disclosed in Patent Document 1, the stator and the fin member are separately formed, and the heat conduction between them may not always be performed satisfactorily. In addition, the stator is formed of laminated steel plates, and in order to improve the heat conduction with the fin member, it is necessary to improve the surface accuracy of the peripheral surface by finishing the peripheral surface, which requires assembly work. In addition, there was a problem that the workability of the assembly work was poor.

  The present invention surrounds the outer periphery of the stator, a hollow cylindrical stator body formed by molding of a dust core material, a single continuous groove formed during molding over the entire outer peripheral surface of the stator. And a cover that forms a continuous refrigerant flow path by covering the single continuous groove, and has an inlet and an outlet formed at both ends of the refrigerant flow path. Stator member for motor.

  Further, it is preferable that the one groove is a spiral groove.

  The one groove is preferably formed by combining a circumferential groove and an axial groove of the stator body.

  According to the present invention, a stator is formed using a dust core material. Therefore, at the time of molding, the groove 16 can be formed on the outer peripheral surface, and the stator body can be formed with high accuracy. Therefore, no additional processing work or the like for increasing accuracy is required when the container is accommodated in the casing. And since the outer peripheral surface of a stator is contacting the refrigerant | coolant as it is, very effective cooling of a stator can be achieved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view of a stator according to the embodiment, and FIG. 2 is a perspective view. The stator main body 10 has a hollow cylindrical shape as a whole, and is formed by molding a powder magnetic core material. A predetermined number of coil slots 12 extending in the axial direction of the stator body 10 are formed at equal intervals on the inner peripheral surface side, and teeth 14 are formed between the slots 12. When the motor is assembled, a coil is wound around the slot 12.

  Further, the stator body 10 has a collar shape in which the outer diameter of the upper portion 10a in the drawing is increased, and the lower portion 10b is a cylindrical portion having a smaller outer diameter.

  A spiral groove 16 is formed on the outer peripheral surface of the lower portion 10 b of the stator body 10. That is, in this example, the groove 16 has a spiral shape starting from the lower end of the lower portion 10b and ending at the upper end of the lower portion 10b.

  The stator body 10 is accommodated in a lower casing 20 whose upper part is open. The lower casing 20 has a shape that matches the outer diameter of the stator, and has an outer peripheral surface and a bottom surface of the upper portion 10a, an inner surface that matches a part of the outer peripheral surface and the bottom surface of the lower portion 10b, and the bottom surface is the lower portion 10b. The space 22 is provided below the interior of the stator body 10. An opening is formed at the center of the bottom surface of the lower casing 20.

  Since the lower casing 20 covers the peripheral surface of the lower portion 10b, the groove 16 is covered by the inner surface of the lower casing 20, and the groove 16 functions as a refrigerant flow path. Further, a pipe 24 communicating with an opening provided in the lower casing 20 is provided at a position corresponding to the lower end of the groove 16 of the lower casing 20, and at a position corresponding to the upper end of the groove 16 of the lower casing 20, A pipe 26 communicating with an opening provided in the casing 20 is provided.

  Therefore, one of the pipes 24 and 26 can be used as an inlet and the other as an outlet, and the refrigerant can be circulated through the refrigerant flow path formed by the groove 16. In particular, by forming the groove 16 relatively deeply, the gap in the stator axial direction of the groove 16 acts in the same manner as the fin, and the stator can be effectively cooled. The gap acting as a fin is preferably maintained to a certain size in order to sufficiently maintain the cooling effect and strength.

  Note that the dust core is formed by applying pressure after forming an electrically insulating film on the fine iron powder material. Since the insulating materials are bonded to each other by pressure bonding, the powder magnetic core has a desired shape as a block like a bulk material. A product can be obtained. Since a molded product made of a dust core material is an aggregate of minute iron powders as a whole, an arbitrary three-dimensional shape can be formed alone.

  In the present embodiment, the stator body 10 is formed using a dust core material. At the time of molding, the inner peripheral side slot 12 and the outer side groove 16 are formed simultaneously. Therefore, the stator main body 10 can be formed with high accuracy, and when it is accommodated in the lower casing 20, no additional processing work for increasing accuracy is required.

  And since the outer peripheral surface of the stator main body 10 contacts the refrigerant as it is and fins are formed, very effective cooling of the stator main body 10 can be achieved.

  Here, since the refrigerant flows between the stator main body 10 and the inner surface of the lower casing 20, it is necessary to seal it so as not to flow out. FIG. 3 schematically shows the configuration of the seal. In this example, O-rings 30a and 30b are disposed on the portion of the lower casing 20 that receives the bottom surface of the upper portion 10a of the stator body 10 and the surface that receives the bottom surface of the lower portion 10b, respectively. The O-rings 30a and 30b are arranged in the entire circumferential direction of the stator body 10, and the refrigerant is held in a space partitioned by the two O-rings 30a and 30b. In particular, by pressing the stator body 10 against the lower casing 20 in the axial direction, the sealing by the O-rings 30a and 30b can be ensured.

  The seal structure is not limited to this, and two O-rings may be arranged between the upper end portion of the lower portion 10b, the outer peripheral surface of the lower end portion, and the inner peripheral surface of the lower casing 20, You may arrange.

  Furthermore, it is preferable to carry out rust prevention processing about the part which contacts the refrigerant | coolant (for example, water) of the outer peripheral surface of the stator main body 10. That is, although the powder magnetic core material is covered with the iron powder by the insulating material, the iron powder is easily rusted by the water, and it is better to prevent the stator main body 10 from being covered with water. In addition, about a rust prevention process, there is no problem by application | coating of a normal rust prevention material.

  The lower casing 20 is preferably made of a nonmagnetic metal material such as aluminum or stainless steel.

  FIG. 4 shows a state where the rotor 40 is assembled. Note that a coil 28 wound around the teeth 14 is attached to the stator body 10.

  The rotor 40 is cylindrical and has a predetermined number of poles. For example, the poles are composed of permanent magnets. A rotating shaft 42 is provided through the center of the rotor 40. An upper casing 42 is provided on the lower casing 20 so as to cover the stator body 10 and the rotor 40. Bearings 44a and 44b are provided in the upper casing 42 and a portion through which the rotating shaft 42 of the lower casing 20 passes. Is provided.

  Therefore, the rotor 40 is rotated by forming a rotating magnetic field by supplying a predetermined current to the coil 28 wound around the stator body 10.

  At this time, the stator main body 10 is effectively passed by circulating the refrigerant (for example, water) through the pipes 24 and 26 through the groove 16 and the refrigerant flow path formed by the inner peripheral surface of the lower casing 20. Cooling can cool the motor.

  In the above-described embodiment, the groove 16 is formed in a spiral shape. However, the horizontal groove 16a and the vertical groove 16b as shown in FIG. 5 may be sequentially combined to form a zigzag shape. With this shape, it becomes easier to remove the mold when the stator body 10 is molded. Further, the refrigerant flow path may be a double helix.

It is sectional drawing which shows the structure of the stator member which concerns on embodiment. It is a perspective view which shows the structure of the stator member which concerns on embodiment. It is a figure which shows the structure of a seal | sticker part. It is sectional drawing which shows the structure of the state which assembled | attached the rotor. It is a figure which shows the other structural example of a groove | channel.

Explanation of symbols

  10 Stator body, 10a upper part, 10b lower part, 12 slots, 14 teeth, 16 grooves, 20 lower casing, 22 space, 24, 26 pipe, 28 coils, 30a, 30b O-ring, 40 rotor, 42 upper casing, 42 rotating shaft 44a, 44b Bearings.

Claims (3)

A hollow cylindrical stator body formed by molding a dust core material;
One continuous groove formed during molding over the entire outer peripheral surface of the stator;
A cover that surrounds the outer periphery of the stator, covers the one continuous groove to form one continuous refrigerant flow path, and forms an inlet and an outlet at both ends of the refrigerant flow path;
The stator member for motors characterized by having. The stator for a motor according to claim 1,
The stator member for motors, wherein the one groove is a spiral groove. The stator member for a motor, wherein the one groove is formed by combining a circumferential groove and an axial groove of the stator body.

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