JP2009077547A - Rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor that prevents resin from leaking to the outer peripheral surface of a yoke. <P>SOLUTION: The rotor 10 is provided with permanent magnets 13, a substantially columnar yoke 11 having a storage part 16 for storing the permanent magnets 13, a shaft 12 provided along the center axis of the yoke 11, and an upper lid 14 and a bottom lid 15, that are provided on both end faces of the yoke 11 so as to close the storage part 16. The rotor 10 is configured of an injection gap 163, formed between the inner wall face 161 on the shaft 12 side of the storage part 16 and the permanent magnets 13 where resin is injected thereinto, and the upper lid 14 is formed with an injection hole 141 that communicates with the storage part 16, while a recessed part 142 is formed in the face that faces the permanent magnets 13 of the upper lid 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotor. For example, the present invention relates to a rotor of a motor that drives a hybrid vehicle.

  Conventionally, a motor is used in a hybrid vehicle. Such a motor has, for example, the following structure. That is, a cylindrical motor case and a rotor rotatably held in the motor case are provided.

  The rotor includes a substantially cylindrical yoke that is formed by laminating thin steel plates and has a permanent magnet built therein, and a shaft that passes through the central axis of the yoke. The motor case is provided with a stator whose polarity can be switched. According to this motor, the rotor is rotated using the repulsive force generated by the magnetic force between the permanent magnet built in the yoke and the stator.

In this rotor, in order to effectively use the magnetic force, it is desirable to arrange the permanent magnet on the outer peripheral surface side of the yoke so as to shorten the distance between the permanent magnet and the stator.
Therefore, the following method has been proposed as a method of arranging the permanent magnet on the outer peripheral surface side of the yoke (see Patent Document 1).

  That is, a plurality of storage portions extending along the shaft are provided in the yoke, a magnet is inserted into the storage portion, and a thermosetting resin is injected into the gap between the storage portion and the magnet. Thereafter, by rotating the yoke, the magnet is pressed against the inner wall surface of the storage portion by centrifugal force to position the magnet, and the yoke is heated in a heating furnace to cure the resin (see Patent Document 1).

  However, simply rotating the yoke as described above makes it difficult to reliably position the permanent magnet on the outer peripheral side, and it takes a long working time.

Therefore, a resin is injected between the inner wall surface of the yoke housing portion on the shaft side and the permanent magnet by applying pressure, and the permanent magnet is pressed outward by the pressure of the resin, so that the permanent magnet can be moved in a short time. A positioning method has been proposed.
JP 2000-316243 A

  However, with this proposed method, the gap for injecting the resin between the storage portion and the permanent magnet is narrow, and it is difficult to control the injection amount of the resin.

Further, since the resin is injected under pressure, the injected resin may leak to the outer peripheral surface of the yoke from the gap between the steel plates constituting the yoke.
In particular, when a low viscosity resin such as silicon is used, such a tendency becomes remarkable. In addition, it is necessary to provide an air gap between the rotor and the stator. If the resin leaks to the outer peripheral surface of the yoke in this way, a process for securing the air gap by removing the leaked resin is required. The nature will decline.

  An object of this invention is to provide the rotor which can prevent resin leaking to the outer peripheral surface of a yoke.

  A rotor (for example, a rotor 10 described later) of the present invention has a substantially cylindrical shape provided with a magnet (for example, a permanent magnet 13 described later) and a storage section (for example, a storage section 16 described later) for storing the magnet. A yoke (for example, a later-described yoke 11), a shaft portion (for example, a later-described shaft 12) provided along the central axis of the yoke, and a pair of shafts provided on both end surfaces of the yoke to block the storage portion A rotor including end face plates (for example, an upper lid 14 and a bottom lid 15 to be described later), between an inner wall surface (for example, an inner wall surface 161 to be described later) and the magnet on the shaft side of the storage unit. Is formed with an injection gap (for example, an injection gap 163 to be described later), and one of the end face plates has an injection hole (for example, an injection hole 141 to be described later) communicating with the storage portion. Formed and one end of the The surface opposite to the magnet plate, recesses (e.g., recess 142 will be described later), characterized in that is formed.

According to the present invention, an injection gap for injecting resin is formed between the inner wall surface on the shaft side of the storage portion and the magnet, and an injection hole communicating with the storage portion is formed in one of the end face plates. .
Therefore, the procedure for fixing the permanent magnet to the storage portion is as follows. That is, first, a magnet is inserted into the storage portion, and a thermosetting resin is injected from the injection hole. Then, this resin flows into the injection gap between the magnet and the storage portion, presses the magnet toward the outer peripheral surface side of the yoke, and also flows into the gap between the magnet and the end face plate. Thereafter, when the rotor is heated from the outer peripheral surface side, the injected resin is cured, and the magnet is fixed to the storage portion.

  Here, since the concave portion is formed on the surface of the one end face plate facing the magnet, the resin flowing into the gap between the end face plate and the magnet flows into the concave portion. Then, since this recessed part functions as a buffer, it can prevent that resin leaks to the outer peripheral surface of a yoke.

  In this case, it is preferable that the volume of the recess is substantially the same as the volume of the resin injected into the injection gap.

  According to this invention, the volume of the recess is made substantially the same as the volume of the resin injected into the injection gap. Therefore, it is not necessary to strictly control the injection amount of the resin, and the resin can be prevented from leaking to the outer peripheral surface of the yoke even if the resin amount is simply controlled based on the injection time.

  In this case, if the inner wall surface located on the outer peripheral surface side of the yoke of the storage portion is an outer inner wall surface (for example, an inner wall surface 164 described later), the portion of the one end plate facing the outer inner wall surface It is preferable that a projection (for example, a projection 143 described later) that contacts the magnet is formed.

  According to the present invention, the protrusion that contacts the magnet is formed on the portion of the one end face plate facing the outer inner wall surface of the storage portion. Therefore, this protrusion closes the gap between the end face plate and the magnet, and the injected resin can be prevented from leaking from the storage portion to the outer peripheral surface of the yoke.

  According to the present invention, an injection gap for injecting resin is formed between the inner wall surface on the shaft portion side of the storage portion and the magnet, and an injection hole communicating with the storage portion is formed in one of the end face plates. . Therefore, the procedure for fixing the permanent magnet to the storage portion is as follows. That is, first, a magnet is inserted into the storage portion, and a thermosetting resin is injected from the injection hole. Then, this resin flows into the injection gap between the magnet and the storage portion, presses the magnet toward the outer peripheral surface of the yoke, and also flows into the gap between the magnet and the end face plate. Thereafter, when the rotor is heated from the outer peripheral surface side, the injected resin is cured, and the magnet is fixed to the storage portion. Here, since the concave portion is formed on the surface of the one end face plate facing the magnet, the resin flowing into the gap between the end face plate and the magnet flows into the concave portion. Then, since this recessed part functions as a buffer, it can prevent that resin leaks to the outer peripheral surface of a yoke.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view of a rotor 10 of a motor according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view and a side view of the rotor 10.
The rotor 10 is housed in a cylindrical motor case (not shown) and is rotatably held inside the motor case. This motor case is provided with a stator whose polarity can be switched.

  The rotor 10 includes a permanent magnet 13, a substantially cylindrical yoke 11 in which the permanent magnet 13 is built, a shaft 12 as a shaft portion provided along the central axis of the yoke 11, and both end surfaces of the yoke 11. The top cover 14 and the bottom cover 15 are provided as end plates attached to the base plate.

  According to this motor, the rotor 10 is rotated using the repulsive force generated by the magnetic force between the permanent magnet 13 built in the yoke 11 and the stator.

The yoke 11 is formed by laminating a plurality of electromagnetic steel plates 111.
The yoke 11 is provided with a storage portion 16 extending along the central axis, and the permanent magnet 13 is stored in the storage portion 16 and fixed with resin.
The upper lid 14 and the bottom lid 15 close both end surfaces of the storage portion 16.
A collar portion 17 for holding the upper lid 14 is attached to the upper end of the shaft 12.

FIG. 3 is a partially enlarged plan sectional view of the rotor 10, and FIG. 4 is a partially enlarged longitudinal sectional view of the rotor 10.
The inner wall surface on the shaft 12 side of the storage portion 16 is an inner wall surface 161, and the inner wall surface on the outer peripheral surface side of the yoke 11 is an inner wall surface 164 as an outer inner wall surface.
An injection groove 162 having a substantially semicircular cross section for injecting resin is formed on the inner wall surface 161 of the storage portion 16 along the central axis. An injection gap 163 into which resin is injected is formed between the inner wall surface 161 of the storage portion 16 and the permanent magnet 13.

  The upper lid 14 is formed with a substantially circular injection hole 141 that penetrates the upper lid 14, communicates with the storage portion 16, and is connected to the injection groove 162. The injection hole 141 is connected to an injection nozzle 23 (described later) to inject resin. The injection hole 141 is formed larger than the injection groove 162 in order to smoothly inject the resin into the injection groove 162 through the injection hole 141 even if an attachment error of the upper lid 14 with respect to the yoke 11 occurs.

Further, a recess 142 is formed on the surface of the upper lid 14 facing the permanent magnet 13.
Further, a protrusion 143 that contacts the permanent magnet 13 is formed on a portion of the upper lid 14 that faces the inner wall surface 164 of the storage portion 16. That is, the protrusion 143 is located outside the recess 142, and the gap between the upper lid 14 and the permanent magnet 13 is closed by the protrusion 143 outside the recess 143.

Here, the size of the recess 142 is determined by the following procedure.
As shown in FIG. 4, the volume of the recess 142 is substantially the same as the volume of the resin injected into the injection gap 163. Specifically, the product of the height h1 of the concave portion 142 and the length w1 of the concave portion 142 is substantially equal to the product of the width w2 of the injection gap 163 and the height h2 of the storage portion 16.

The above rotor 10 is manufactured by the following procedure.
First, the rotor 10 is assembled. That is, after attaching the bottom cover 15 to the shaft 12, the electromagnetic steel plates 111 are stacked and press-fitted into the shaft 12 to form the yoke 11. Subsequently, the permanent magnet 13 is inserted into the storage portion 16 of the yoke 11 and the upper lid 14 is attached. Thereafter, the collar portion 17 is press-fitted into the shaft 12.

  Next, the rotor 10 is preheated and the resin is injected into the storage unit 16. Thereafter, the rotor 10 is fully heated to cure the resin, and then cooled.

Here, a procedure for injecting resin into the storage unit 16 will be described.
As shown in FIG. 5, resin is injected into the rotor 10 using an injection nozzle 23.
The injection nozzle 23 discharges a two-component mixed thermosetting resin while stirring. At the tip of the injection nozzle 23, a rubber packing 231 is provided for bringing the tip of the injection nozzle 23 and the upper lid 14 into close contact with each other. The injection nozzle 23 is movable in the vertical direction and is urged downward by a spring mechanism (not shown).

First, the above injection nozzle 23 is connected to the injection hole 141 of the upper cover 14 of the rotor 10 to inject a thermosetting resin into the injection hole 141.
Then, this resin flows into the gap between the permanent magnet 13 and the storage portion 16. Specifically, the injected resin flows downward through the injection groove 162 (indicated by an arrow A in FIG. 5), presses the permanent magnet 13 against the outer peripheral surface side of the yoke 11, and causes the permanent magnet 13 to move. Press the inner wall surface 164.
At the same time, the injected resin flows substantially horizontally through the gap between the permanent magnet 13 and the upper lid 14 and flows into the recess 142 (indicated by an arrow B in FIG. 5). Thereafter, the resin that has flowed into the concave portion 142 tends to flow further outward, but on the outer side of the concave portion 143, the gap between the permanent magnet 13 and the upper lid 14 is closed by the protrusion 143. The flow will be blocked.

FIG. 6 is a diagram illustrating the relationship between the resin injection time and the injection pressure for the rotor 10.
When the recess is not provided, when the resin is injected, the injection pressure increases as the injection time increases during the injection time from zero to t1, and at the injection time t1, the storage portion is filled with the resin, and the injection pressure is p1. It becomes. Thereafter, when the resin injection is continued, the injection pressure rapidly increases.

  In the case where the recess is provided, when the resin is injected, the injection pressure rises as the injection time increases during the injection time from zero to t2. At the injection time t2, the storage portion is filled with the resin, and the injection pressure is p2. It becomes. Here, the injection time t2 is longer than the injection time t1, and the injection pressure p2 is lower than the injection pressure p1. Thereafter, when the resin injection is continued, the injection pressure rapidly increases.

  In this way, when the concave portion is provided, the pressure fluctuation is smaller than when the concave portion is not provided, so it is not necessary to strictly control the resin injection amount, and the resin injection amount is managed by the injection time. I understand that I can do it. Furthermore, since the injection pressure at the completion of resin filling is also low, it can be seen that the amount of overshoot can be suppressed.

According to this embodiment, there are the following effects.
(1) An injection gap 163 for injecting resin is formed between the inner wall surface 161 on the shaft 12 side of the storage unit 16 and the permanent magnet 13, and an injection hole 141 communicating with the storage unit 16 is formed in the upper lid 14. .
Therefore, the procedure for fixing the permanent magnet 13 to the storage portion 16 is as follows. That is, first, the permanent magnet 13 is inserted into the storage portion 16, and a thermosetting resin is injected from the injection hole 141. Then, the resin flows into the injection gap 163 between the permanent magnet 13 and the storage portion 16, pressing the permanent magnet 13 toward the outer peripheral surface of the yoke 11, and the gap between the permanent magnet 13 and the upper lid 14. Also flows. Thereafter, when the rotor 10 is heated from the outer peripheral surface side, the injected resin is cured, and the permanent magnet 13 is fixed to the storage portion 16.

  Here, since the concave portion 142 is formed on the surface of the upper lid 14 facing the permanent magnet 13, the resin that flows into the gap between the upper lid 14 and the permanent magnet 13 flows into the concave portion 142. Then, since the recess 142 functions as a buffer, the resin can be prevented from leaking to the outer peripheral surface of the yoke 11.

  (2) The volume of the recess 142 is made substantially the same as the volume of the resin injected into the injection gap 163. Therefore, it is not necessary to strictly control the resin injection amount, and even if the resin amount is simply controlled based on the injection time, the resin can be prevented from leaking to the outer peripheral surface of the yoke.

  (3) A protrusion 143 that is in contact with the permanent magnet 13 is formed on a portion of the upper lid 14 that faces the inner wall surface 164 of the storage portion 16. Therefore, the protrusion 143 closes the gap between the upper lid 14 and the permanent magnet 13, and the injected resin can be prevented from leaking from the storage portion 16 to the outer peripheral surface of the yoke 11.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

It is a top view of the rotor which concerns on one Embodiment of this invention. It is the longitudinal cross-sectional view and side view of the rotor which concern on the said embodiment. It is a partial enlarged plan view of the rotor according to the embodiment. It is a partial expanded longitudinal cross-sectional view of the rotor which concerns on the said embodiment. It is sectional drawing for demonstrating the procedure which inject | pours resin into the accommodating part of the rotor which concerns on the said embodiment. It is a figure which shows the relationship between resin injection | pouring time and injection | pouring pressure about the rotor which concerns on the said embodiment.

Explanation of symbols

10 rotor 11 yoke 12 shaft (shaft)
13 Permanent magnet 14 Top lid (end face plate)
141 Injection hole 142 Recess 143 Protrusion 15 Bottom cover (end face plate)
16 Storage portion 161 Inner wall surface 163 Injection gap 164 Inner wall surface (outer inner wall surface)

Claims (3)

A magnet, a substantially cylindrical yoke provided with a storage portion for storing the magnet, a shaft portion provided along the central axis of the yoke, and provided at both end surfaces of the yoke to block the storage portion A rotor comprising a pair of end face plates,
Between the inner wall surface on the shaft portion side of the storage portion and the magnet, an injection gap into which resin is injected is formed,
One of the end surface plates is formed with an injection hole communicating with the storage portion, and a concave portion is formed on a surface of the one end surface plate facing the magnet. . The rotor according to claim 1, wherein
The volume of the recess is substantially the same as the volume of resin injected into the injection gap. The rotor according to claim 1 or 2,
When the inner wall surface located on the outer peripheral surface side of the yoke of the storage portion is an outer inner wall surface,
The rotor is characterized in that a protrusion abutting against the magnet is formed on a portion of the one end plate facing the outer inner wall surface.

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