JP2006102405A - Simple linear motor for toy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To build a simple linear motor for toy which surely operates while the number of parts is made small as much as possible, and the motor is simplified. <P>SOLUTION: A solenoid coil and a lead switch are installed in a long plate-like rail which becomes a stator. A permanent magnet is installed in a moving element, and a thrust is generated only by a resilient magnetic force of both the moving element and the stator. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention belongs to a simple linear power device (simple linear motor) mechanism using a repulsive magnetic force of a permanent magnet and an electromagnet, and a specific manufacturing method thereof.

The conventional linear motor is premised on the transportation of heavy objects, and its thrust does not assume inertial energy, and an electromagnet, a roller for supporting a mover, or a rail must be provided in the entire range of the stator. For example, in this case, it is necessary to install an electromagnet on the entire surface of the rail, and it is necessary to install a roller on the entire surface of the rail in order to reduce friction with the stator. (For example, refer to Patent Document 1.)
In general, linear motors are used in industrial mechanisms, and the amount of movement (step amount) of the mover is often detected and set. It is necessary to install a permanent magnet. (For example, refer to Patent Document 2 and Patent Document 3.)

JP 55-132295 A JP-A-63-206153 JP 61-199457 A

The conventional linear motor requires a permanent magnet or an electromagnet over the entire area of the stator because it attracts or repels due to the magnetic force between the stator and the mover, and in some cases uses both energies as thrust.
Also, since the purpose generally requires position control and motion control of the mover, various devices for controlling the mover are usually required.
Because of these factors, compared to other motor power such as a DC motor, it is complicated, has a large number of parts, and is expensive to manufacture. Therefore, it is not suitable for the power mechanism for toys which is the object of the present invention.

  An object of the present invention is to apply a reliable thrust to the mover with as few parts as possible and to be suitable for a toy power mechanism.

  In order to achieve the above object, an electromagnet (hereinafter referred to as a solenoid coil) and a reed switch are installed at regular intervals on the bottom surface of a long plate-shaped rail made of resin or the like, and this is used as a stator. At this time, the solenoid coil and the reed switch are arranged such that the direction of the magnetic flux generated by the solenoid coil is directed to the top surface, or slightly to the moving direction of the mover, and the permanent magnet on the mover side is generated as the generated magnetic pole. It shall be of the same polarity as the polarity. The reed switch is installed at a position where the magnetic force of the mover side permanent magnet can be sensed immediately after the mover passes through the solenoid coil installed on the stator.

  Permanent magnets such as ferrite are installed in a chassis having tires arranged at four corners, and this is used as a mover. At this time, the magnetic flux generated by the permanent magnet is directed to the lower surface or slightly rearward, and the generated magnetic pole has the same polarity as the magnetic pole generated by the stator side solenoid coil.

  Since the present invention is configured as described above, the following effects can be obtained.

  A linear motor can be realized with very few parts.

The power on the mover side is only an inexpensive permanent magnet such as ferrite, which can be reduced in cost and size, and has no complicated internal mechanism. Therefore, the design of the mover itself is highly flexible.
Further, there is no mechanical mechanism such as a gear for acceleration / deceleration and the durability is extremely high.

  The application to the stator coil is automatically performed by the approach of the mover to the stator-side reed switch, and does not require various control devices and is non-contact, so that the durability and reliability are high.

  A permanent magnet 3 and an axle 9 / wheel 8 are provided on the chassis 2 shown in FIG.

  The wheels 8 are provided with ribs 10 shown in FIG. 4 as necessary in order to reduce rolling resistance during traveling. Further, a chamfer 11 is provided as necessary.

As shown in FIG. 2, solenoid coils 6 are provided at regular intervals inside the long plate-shaped rail 1 made of resin or the like shown in FIG. 1, and leads are provided for each solenoid coil 6. Install the switch 7.
At this time, the polarity of the magnetic force generated by the solenoid coil 6 on the upper surface is the same as that of the lower surface magnetic force polarity of the mover side permanent magnet 3 facing each other.

  Rail guides 5 are provided on both sides of the rail 1 to prevent the mover from being removed.

As shown in FIG. 5, when the permanent magnet 3 of the mover approaches the reed switch 7 of the stator, it is applied to the solenoid coil 6 to generate a magnetic force.
Then, as shown in FIG. 6, since the permanent magnet 3 of the mover and the magnetic pole facing the solenoid coil 6 are the same, the mover moves forward with a repulsive magnetic force.
Immediately after the thrust obtained by the repulsive magnetic force and moving forward, the reed switch 7 and the permanent magnet 3 of the mover are separated from each other as shown in FIG. At this time, the mover keeps moving forward by a certain amount due to inertia.
The permanent magnet 3 of the mover moving forward by inertia approaches the next reed switch 7 ′, and the solenoid coil 6 ′ applies and obtains a repulsive magnetic force, and repeats acceleration.

  In previous experiments, a ferrite magnet having a magnetic flux density of 120 Tesla (hereinafter referred to as T) was used for the permanent magnet 3 of the mover, the total weight of the mover was set to 30 g, and a UEW Litz wire of 0.37φ was set to 30φ. It has been proved that a reliable thrust can be obtained when the solenoid coil 6 of the wound stator is used and the power source 4 generates 5T from the solenoid coil 6 at an induced voltage of 6V.

If a ferromagnetic coil core is used for the solenoid coil 6 as required, a stronger magnetic flux is obtained and the thrust of the mover increases.
Similarly, if a permanent magnet such as neodymium having a strong magnetic flux is used by the permanent magnet 3 of the mover, a stronger driving force can be obtained.

  Since the reed switch 7 is a type in which an inert gas is sealed with a glass tube, contact corrosion does not occur even when used for a long period of time, and durability and reliability can be increased.

FIG. It is explanatory drawing inside a stator. It is a mover explanatory drawing. It is a needle | mover wheel site | part figure. It is mechanism explanatory drawing. It is mechanism explanatory drawing. It is mechanism explanatory drawing. It is mechanism explanatory drawing. It is a stator side solenoid part circuit diagram.

Explanation of symbols

1 Rail 2 Chassis 3 Permanent Magnet 4 DC Power Supply 5 Rail Guide 6 Solenoid Coil 7 Reed Switch 8 Wheel 9 Axle 10 Rib 11 Chamfer

Claims (1)

A simple linear motor for toy that moves forward with a thrust generated by a repulsive magnetic force when a car with a permanent magnet installed on the rail is installed on the bottom of the long plate-shaped rail. .

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