JP2593914Y2 - Linear motor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor provided with cooling means for forcibly cooling a coil.

[0002]

2. Description of the Related Art A cylindrical linear motor is used to drive an elevator up and down. The structure of this cylindrical linear motor is shown in FIGS. The linear motor is composed of a long secondary side 2 extending in the left-right direction in FIG. 8 and a primary side 1 that can travel along the secondary side 2. As shown in FIG. 7, the primary side 1 is disposed at every 90 degrees in the circumferential direction so as to surround the secondary side 2, and extends along the secondary side 2, and has an axis formed by the cores 3. It is composed of a flange 5 having a wheel 4 that is integrally connected so as to be sandwiched from the direction and rolls in contact with the outer peripheral surface of the secondary side 2, and coils 6 respectively housed in slits inside the iron core 3.

[0003] The rated capacity of such a linear motor is the coil 6
The number of turns and the number of coils 6 are increased or decreased, or the length of the primary side 1 is increased or decreased. On the other hand, no cooling means is provided in the linear motor. The reason is that a blower used in a general induction rotating machine is difficult to install due to mounting space and structural problems. Since there is no cooling means, the rated capacity of the linear motor is determined within a range that does not cause overheating due to natural cooling even when continuous operation is performed.

[0004]

However, since there is no cooling means, the temperature of the coil rises and approaches the allowable temperature of the coil, causing the following problems.

[0005] First, if the temperature rise of the coil due to continuous operation of the linear motor is repeated a plurality of times, the insulation performance of the coil and the like is reduced due to the temperature deterioration, the life of the linear motor is shortened, and the copper loss of the coil increases. As a result, the efficiency of the linear motor decreases.

When the rated capacity is increased in accordance with the specifications, the external dimensions of the linear motor must be increased in order to improve heat dissipation. However, since the external dimensions of the linear motor are limited, it is inevitable. There is a limitation in increasing the rated capacity.

Therefore, an object of the present invention is to provide a linear motor that solves the above problem.

[0008]

In order to achieve the above object, the structure of the present invention is to dispose a plurality of coils at substantially equal intervals along a circumferential direction so as to surround a long secondary side. In the linear motor, which connects the iron cores extending along the length direction of the secondary side and accommodates the coil surrounding the secondary side in the slit provided in each iron core and forms the primary side, the outer periphery of the primary side To attach the blower to the primary side with a gap between the primary side and the mounting base that covers a part in the circumferential direction, attach the blower to the mounting base, and blow the wind generated by the blower to the coil Is formed at a position corresponding to the blower on the mounting base, and guide portions for sending the wind generated by the blower to the mounting surface side of the coil opposite to the blower are formed on both sides of the mounting base.

[0009]

By operating the blower during operation of the linear motor, air in the atmosphere is blown directly from the slit to the coil by the blower, or moved to the opposite side of the coil via a guide, and then blown to the coil. Can be Therefore, the linear motor can be operated without increasing the temperature of the coil.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. In this embodiment, since a part of the conventional linear motor is improved, the same parts as those of the conventional linear motor are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described.

(A) First Embodiment FIGS. 1 and 2 show a first embodiment of a linear motor according to the present invention. As shown in the drawing, a plurality of blowers 11 are attached to the outside of the primary side 1 via an attachment base 10. Mounting base 10
As shown in FIG. 3, the length is set to be substantially the same as the length of the iron core 3, and guide portions 10a are formed on both sides thereof. As shown in FIG.
1 is formed to make the cooling of the coil 6 efficient by moving the wind to the lower side of the coil 6 in FIG. 1 and forms a quarter arc. The mounting base 10 has a plurality of rectangular slits 10b along its length direction.
Are formed, and the mounting table 1 corresponding to the slit 10b is formed.
A small and thin blower 11 is attached to the outside of the cylinder 0 through a bolt (not shown) inserted into the attachment hole 10c. The mounting base 10 is disposed on the opposite side from the lower side in FIG. 1, which is the outlet of the terminal 6 a in the coil 6, with a certain gap between the mounting base 10 and the iron core 3 or the like so that air flows therethrough. To the iron core 3.

Next, the operation of the linear motor will be described. When the blower 11 is operated while operating the linear motor, air in the atmosphere is blown by the blower 11 onto the upper surface of the coil 6 and the iron core 3 through the slit 10b as shown in FIG. And flows down the primary side 1 in FIG. 1 and is sprayed on the lower surface of the coil 6 and the like. Therefore, the coil 6 and the iron core 3 are forcibly cooled from the entire circumference.

Since a small and thin blower 11 is used to cool the coil and the like, and the air flow is dispersed in the length direction of the linear motor, the external dimensions are kept substantially equal to those of the conventional linear motor. In addition, the cooling capacity of the blower, which is the minimum air volume for preventing overheating, can be satisfied.

(B) Embodiment 2 If the primary side 1 of the linear motor generates a temperature difference in the circumferential direction, problems such as loosening of bolts due to distortion due to thermal expansion occur. For this reason, in the second embodiment, no temperature difference is caused in the circumferential direction.

FIG. 5 shows a second embodiment of the linear motor. As can be seen by comparing FIG. 5 with FIG. 1, the guides 10 a formed on both sides of the mounting base 10 are blowers 11 on the primary side 1.
Is extended to the side opposite to the mounting side, and the wind is blown to the terminal 6a. FIG. 6 shows a side view of the mounting base 10 corresponding to FIG. 4 in the first embodiment.

With this structure, air in the atmosphere is blown onto the upper surface of the coil 6 and the iron core 3 in FIG. 5, and then guided by the guide 10a to move to the opposite side of the blower 11. Then, after collision at the position of the terminal 6a, it is released into the atmosphere. For this reason, iron core 3 in iron core 3
The temperature difference between the portions a to 3d and the entire circumference of the coil 6 is reduced. Therefore, distortion due to thermal expansion in the linear motor can be reduced as much as possible. In this embodiment, since the mounting base 10 covers most of the primary side 1, the mounting base 10 also serves to protect the coil 6.

[0017]

[Effects of the Invention] As can be seen from the above description, according to the linear motor of the present invention, since the blower is provided on the primary side, the temperature rise of the coil can be suppressed, and the insulation performance of the coil and the like due to temperature deterioration can be reduced. The reduction can be prevented and the life of the linear motor can be extended. Then, as the temperature of the coil decreases, the copper loss of the coil also decreases, and the efficiency of the linear motor improves. Further, since overheating is prevented by the presence of the blower, the rating of the conventional linear motor can be covered by several ranks.
In other words, the capacity of the linear motor can be reduced with respect to the same rating as the conventional one, and the linear motor can be downsized.

Further, since the air flow is created around the primary side by the guides formed on both sides of the mounting base, the cooling efficiency of the coil and the like is improved, and the capacity of the blower can be effectively utilized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a linear motor according to the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG. 1;

FIG. 3 is a front view of a mounting base.

FIG. 4 is a right side view of the mounting base.

FIG. 5 is a configuration diagram showing a second embodiment of the linear motor according to the present invention;

FIG. 6 is a side view of the mounting base.

FIG. 7 is a configuration diagram of a conventional linear motor.

8 is a view taken in the direction of arrows BB in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Primary side 2 ... Secondary side 3 ... Iron core 6 ... Coil 10 ... Mounting base 10a ... Guide part 10b ... Slit 11 ... Blower

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiichi Korogi 2-1-17-1 Osaki, Shinagawa-ku, Tokyo Inside Meidensha Co., Ltd. (56) References Real Open Showa 50-73823 (JP, U) Real Open Showa 53 72116 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 41/02-41/035 B60L 13/02

Claims (1)

(57) [Scope of request for utility model registration] An iron core, which is disposed at substantially equal intervals along the circumferential direction so as to surround the elongated secondary side and extends along the length direction of the secondary side, is connected to each other. In a linear motor having a primary side in which a coil surrounding a secondary side is accommodated in a slit provided in an iron core, a mounting base that covers a part of the outer peripheral portion of the primary side in a circumferential direction is defined as a primary side. To the primary side with a gap between them,
For mounting the blower on the mounting base, forming a slit at the position corresponding to the blower on the mounting base to blow the wind generated by the blower to the coil, and sending the wind generated by the blower to the opposite side of the blower on the coil from the mounting surface A linear motor having guide portions formed on both sides of a mounting base.