JP2728922B2 - Cooling device for linear motor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention comprises a stator and a mover constituting primary and secondary conductors, and the movable element is driven by a drive power supplied to the primary conductor. The present invention relates to a linear motor device that is driven to travel along the axis of a stator, and in particular, dissipates heat generated in the stator and the movable member by traveling of the movable member to prevent overheating of the movable member and / or the stator. And a cooling device. Further, the present invention relates to an elevator apparatus using a linear motor device as a driving device.

[Prior Art] JP-A-59-64490 proposes an elevator apparatus using a linear motor as a drive source. In this elevator device, a primary-side stator attached to a building, a lifting cage or a counterweight that is close to the stator and suspended in a vertical direction by a magnetic force of the stator, and functions as a secondary conductor of a linear motor. In each case, a so-called flat linear motor having one tape-shaped metal body is used.

Japanese Patent Application Laid-Open No. 57-121568 discloses an elevator apparatus using a so-called cylindrical (toroidal type) linear motor composed of a primary coil formed in a hollow cylindrical shape and a conductor penetrating the primary coil. ing.

[Problems to be Solved by the Invention] By the way, in each of the two conventional examples described above, since the electric resistance on the secondary side is increased, the secondary current generated on the secondary side by the induced magnetic field is converted into thermal energy. It is easily converted, and therefore, both the stator and the mover may generate heat, resulting in overheating. In particular, since the heat generated by the mover and the stator is caused by the electric resistance of the secondary side conductor, the problem of overheating of the mover and the stator becomes more serious in an elevator that is frequently used.

In addition, there is a concern that the heat generated by the mover and the stator may affect the induced magnetic field.

Therefore, an object of the present invention is to provide a cooling device capable of effectively cooling a mover and a stator of a linear motor device.

[Means for Solving the Problems] In order to achieve the above object, according to the present invention, a stator disposed along a predetermined traveling axis and functioning as a primary or secondary conductor, The stator is provided with a mover that faces the stator with an air gap at a predetermined interval and that functions as a secondary or primary conductor, and is supplied to the stator or the mover that functions as the primary conductor. In a linear motor device in which a power source is converted into a magnetic driving force and the mover is caused to travel along the traveling axis, a hollow member that slides with the traveling operation of the mover while being in contact with the stator. A heat conductive fluid sealed in the hollow chamber of the hollow member, a cooling medium is brought into contact with at least a part of the outer surface of the hollow member, and heat generated in the stator is transmitted to the cooling medium, thereby fixing. Provide means for cooling It has a digit structure.

[Operation] According to the above configuration, the heat generated in the stator is transmitted to the heat conductive fluid in the hollow chamber from the stator contact portion of the hollow member and is radiated into the air from the outer surface of the hollow member. ,
During operation of the mover, cooling of the stator is performed.

Hereinafter, an elevator apparatus using a linear motor device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a configuration of an elevator apparatus using a linear motor device according to a preferred embodiment of the present invention as a power source. According to the illustrated configuration, a pair of guide rails 7a and 7b are provided in the hoistway in parallel with each other, and the hoisting basket 4 is fitted with the guide rollers 9 on the guide rails 7a and 7b, and Drive along. The elevating basket 4 has an entrance opening 4a formed on the entire surface, and the entrance opening 4a is opened and closed by a door 4b.

In the hoistway, a pair of guide rails 8a and 8b are further provided.
It is provided in parallel with the guide rails 7a, 7b. The guide rails 8a and 8b guide the elevating basket 4 and the counterweight unit 3 connected via a rope 6 wound around a sheave 5 rotatably supported by an upper support frame 12.

The counterweight unit 3 includes guide rails 8a and 8b
A counterweight frame 3a that runs along the guide rails by a guide roller 3b fitted to the counterweight, a weight 2 mounted on the counterweight frame, and a brake unit 16 for emergency stop and floor stop. As shown in FIG. 1, the weights 2 are divided and arranged on both sides in the width direction of the counter weight frame 3a, and the counter weight unit 3 is driven to run at the center in the width direction of the counter weight frame. The coil unit 1 functioning as a primary mover of a linear motor device that drives the elevator basket 4 up and down is fixedly attached. The coil unit 1 is connected to a power supply cable (not shown) and is excited by a driving power supplied from a known power supply circuit to generate an induction magnetic field.

In this embodiment, the coil unit 1 is formed in an annular cylindrical shape, and a column 10 constituting a secondary stator of a linear motor is inserted into a center hole of the coil unit. The column 10 has an upper end rotatably attached to an upper support frame 12 via a pivotal support member 13 and a lower end elastically tensioned through an elastic support member 14 to be normally in a vertical state. It is held, and is supported so as to be rotatable about the pivot point at the upper end in the lateral direction when an external force exceeding the tension is input.

At least one of the upper and lower ends of the counterweight frame 3a detects when an air gap formed between the opposing surfaces of the coil unit 1 and the column 10 becomes smaller than a predetermined minimum gap, and detects an abnormality. A gap sensor 16 that generates a detection signal is attached. A roller unit 15 is provided at the upper and lower ends of the coil unit 1 so as to regulate the relative displacement between the coil unit 1 and the column 10 and maintain a predetermined air gap.

In the illustrated embodiment, the primary coil of the linear motor device is mounted on the counterweight frame as a movable element, and the secondary stator is configured as a column. It is also possible to configure the mover with a secondary conductor, and to configure the mover with a secondary conductor. Further, in the illustrated embodiment, the linear motor device is mounted on the counterweight side, and the counterweight unit 3 is driven to travel, thereby indirectly driving the elevator basket 4. It is possible to provide a linear motor device on the elevator basket side to directly drive the elevator basket. However, since the weight of the mover can be used as a part of the weight, it is preferable to mount the linear motor device on the counterweight side as shown in the drawing.

When the elevator is operated using the linear motor device having the above configuration, both the coil unit 1 functioning as the primary conductor and the column 10 functioning as the secondary conductor generate heat, and the outer surface temperature of the coil unit 1 is reduced. ,Celsius
It turned out to be more than 100 degrees. This heat is mainly due to the relatively large electric resistance of the column 10, and the secondary current generated in the column 10 is converted into thermal energy by this resistance due to the dielectric magnetic field generated by the excitation of the coil unit 1. This is considered to be a result of transmission from the column to the coil side.

In order to prevent overheating of the coil unit 1, a large number of plate-shaped cooling fins 1b are provided on the outer surface of the cover member 1a covering the coil at predetermined intervals along the axis (travel axis) of the coil. There is a way to do that. For this reason, the cooling fins 1b are parallel to the flowing direction of the traveling wind. The cooling fins 1b have a substantially cylindrical shape as a whole, and a wind guide plate 1d is attached so as to cover the outer periphery. The air guide plate 1d has a cylindrical shape as a whole and includes a main body 1f in contact with the outer surface of the cooling fins 16, and a trumpet-shaped traveling wind guide 1e formed at both upper and lower ends (in the axial direction). I have. For this reason, a large amount of traveling wind is collected by the traveling guidance section 1e and is forcibly blown to the cooling fins 1b in the air guide plate 1d. Then, a large amount of traveling wind blown to the cooling fins 1b flows between the cooling fins 1b at a high speed. As a result, the heat of the coil unit 1 is cooled with high cooling efficiency via the cooling fins 1b, and the heat of the column 10 is also cooled.

In the embodiment of the present invention, the elastic unit 20 shown in FIG. 3 is provided at the upper and lower ends of the coil unit 1 instead of the roller 15, and the column 10 is cooled. According to the configuration shown in FIG. 3, the elastic unit 20 includes a metallic heat radiating plate 21 provided on the outside and an elastic member 23 such as rubber or urethane forming a liquid-tight chamber 22 between the heat radiating plate 21 and the heat radiating plate 21. And a cloth member 24 such as felt attached to the inside of the elastic member. A fluid having high thermal conductivity is sealed in the liquid-tight chamber 22. The elastic body unit 20 configured as described above attenuates the relative displacement force between the column and the coil unit, and secures a predetermined air gap between the opposing surfaces of the column and the coil unit. If the heat radiating plate 21 is formed in a bellows shape and imparts a heat radiating effect together with a vibration damping effect by a fluid and an elastic body, the coil unit and the column can be effectively cooled.

[Effect] By using the cooling device described above, the mover and the stator are efficiently cooled. Therefore, performance deterioration due to overheating of the mover and the stator is prevented. Therefore, when this cooling device is used for an elevator, it is possible to always operate the elevator with constant power performance.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an elevator apparatus using a linear motor device according to a preferred embodiment of the present invention. FIG. 2 is a perspective view showing a main part of a cooling device for a mover of a linear motor. FIG. 1 is a perspective view showing a main part of a cooling device of a linear motor device according to an embodiment of the present invention. 1 Coil unit 3 Counter weight unit 4 Lifting basket 1b Cooling fin 1d Wind guide plate 20 Elastic unit

Claims (1)

(57) [Claims] 1. A stator disposed along a predetermined traveling axis and functioning as a primary or secondary conductor, a stator facing the stator with an air gap at a predetermined interval, and a secondary or conductor. It is configured with a mover functioning as a primary-side conductor, and converts a driving power supplied to a stator or a mover functioning as a primary-side conductor into a magnetic driving force, and moves the mover along the traveling axis. In a linear motor device adapted to run, a hollow member that slides with a moving operation of a mover while being in contact with the stator, a heat conductive fluid sealed in a hollow chamber of the hollow member, A cooling device for a linear motor device, comprising: means for bringing a cooling medium into contact with at least a part of an outer surface of a member, transmitting heat generated in the stator to the cooling medium, and cooling the stator. .