JPS58165657A - Linear motor with brush - Google Patents

Abstract

PURPOSE:To increase the output of a linear motor by forming a magnetic flux gap in a magnetic circuit having a magnet, a center pole and a yoke and providing a coil in the gap, thereby increasing the current. CONSTITUTION:A magnetic circuit is composed of a magnet 7, a center pole 8 and a yoke 9, and a magnetic gap 12 is formed in the circuit. A coil 6 is formed in the gap 12, and a pair of brushes 15, 16 are attached to a coil 6 through the gap 12. When the brushes 15, 16 are energized from lead wirings 19, 20 and a current flows through the coil 6, the latter is affected by a force by means of Lorentz's force, which is transmitted from a bobbin 4 to a shaft 13, thereby driving a load. Since the bobbin 4 is electric insulator and the conductive metal forming the coil 6 is isolated from the adjacent conductive metal from each other, the current which is flowed to the coil 6 can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brush-equipped near motor equipped with a brush that allows current to flow through a coil, and aims to increase the current and prevent disconnection of the conductive wire that flows current from the current source to the brush. purpose.

As shown in FIG. 1, the conventional linear motor is equipped with a helical-shaped coil 2 coated with four electric scarlets and disposed closely on the outer periphery of a bobbin 1. When a current is passed through the coil 2 through the four electric wires 3, the coil 2 generates heat, and this heat destroys the insulation coating of the covered conductive wire, so the current value that can be passed through the coil 2 is limited. Since the output of the linear motor is proportional to this current value, the limit of the current value that can be passed through the coil 2 determines the limit of the output of the linear motor, and a large output cannot be obtained.

Further, when the linear motor is driven, the coil 2 repeatedly moves back and forth in the direction of the arrow X, and stress is repeatedly applied to the conductive wire 3, causing the conductive wire 3 to break.

The present invention solves the above-mentioned conventional drawbacks, and its reliable application 15'lJ will be explained below based on FIGS. 2 to 6.

In FIGS. 2 and 3, a bobbin 4 is an electrical insulator having continuous spiral grooves formed on its outer circumferential surface, and is made of ceramic. Reference numeral 6 denotes a coil, which is formed by filling a spiral groove on the outer peripheral surface of the bobbin 4 with electrically conductive metal by casting or the like, and electrically conductive metals in adjacent grooves are insulated from each other.

In FIG. 4, 7 is a magnet, 8 is a center pole, and 9 is a yoke. One end of the center pole 8 is glued to the S pole side of the magnet 7, and the other end of the center pole 8 is provided inside the bobbin 4, with the outer peripheral surface of the center pole tip 10 leaving a slight gap with the inner peripheral surface of the bobbin 4. I keep it. The center part of the yoke 9 is glued to the N pole side of the magnet 7, and both yoke tips 11 are provided on the outer periphery of the coil 6, and the inner circumference of the yoke tips 11 has a slight gap with the outer circumference of the coil 6. is maintained. It is composed of a magnet 8 and a yoke 9, and magnetic flux flows in the direction of arrow B. A magnetic flux gap 12 is formed in the gap between the center pole tip 1o and both yoke tips 11, and the coil 6 is disposed within the magnetic flux gap 12. The shaft 13 is supported by a bearing 14 and is slidable in the direction of the arrow C so that the movement of the bobbin 4 is only a reciprocating motion on the same straight line in the direction of the arrow C.

A pair of brushes 15 are attached to the coil 6 across the magnetic flux gear knob so that current flows through the portion of the coil 6 located within the magnetic flux gap 12. Another pair of brushes 16 are attached to the coil 6 at positions symmetrical to the brush 1b with respect to the centerline of the bobbin 4. brush 15
is in the direction of the arrow E, and the brush 16 is applied with a force by the spring 19 in the direction of the arrow E, so that the contact pressure between the brushes 15 and 7''6 and 1'' is 0.
° ·, current is passed from the brush 15 and the brush 16 to the coil 6. To prevent the brushes 15 and 16 from coming into contact with the coil 6 and being worn out, the brushes 15 and 16 are
and the brush 16 are configured to be replaceable. Reference numeral 19 denotes a conductive wire through which current flows from a current source (not shown) to the brush 16. 2o is also a conductive wire that passes current through the blank 16. Although a single pair of brushes may be used, in order to increase the contact area between the brush and the coil and to maintain a balance of the force applied to the coil, it is desirable to use an even number of 2 or more pairs of brushes. The conductive wire 19 and the conductive wire 2o are connected in parallel.

In the above configuration, when current is applied from the conductive wire 19 to the brush 15 and from the conductive wire 2o to the brush 16, and current is passed through the coils, the coil 6 receives a force in the direction of arrow C due to Lorentz force, and the above force is applied to the bobbin 4. The negative voltage is transmitted to the shaft 13 and driven. The bobbin 4 is an electrical insulator and the electrically conductive metal forming the coil 6 is separated from each other from adjacent electrically conductive metals until the temperature of the electrically conductive metal rises to its melting point or a discharge occurs. υ to coil 6
The current to be stopped can be increased. Also, when driving the linear motor, the coil 6 must repeat reciprocating motion.
Heat can be dissipated in the coil 6 where no current flows,
The temperature rise of the coil 6 can be alleviated. Furthermore, even when the coil 6 is reciprocating, the conductive wire 19 and the conductive wire 20 are stationary and do not receive any force.
There will be no disconnection.

FIG. 6 shows another embodiment of the present invention, in which a magnet 21, a center pole 22, and a yoke 23 constitute a magnetic circuit as shown by a broken line 23, and a magnetic flux density exists in the direction of arrow G. In this case, This is an outer magnet type brushed near motor in which a magnetic flux gap 24 is formed in the gap between the magnet 21 and the center pole 22, and a coil 25 is arranged in the magnetic flux gear 24 circle. effect can be obtained.

As described above, according to the present invention, even if the coil becomes hot, the insulation between adjacent gas conductor metals is maintained, and the portions of the coil where no current is flowing can dissipate heat, allowing large currents to flow through the coil. Because current can be passed through the motor, it is possible to generate a larger output even though it is smaller than conventional linear motors.Furthermore, since current is passed through the brush to the coil, it is effective in preventing cliffs in the conductive wire.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional linear motor, Fig. 2 is a sectional view of a bobbin provided in a brushed linear motor according to an embodiment of the present invention, Fig. 3 is a sectional view of the same coil, and Fig. 4 is a sectional view of the coil. FIG. 5 is a sectional view of an internal magnetic type linear motor with a plan according to an embodiment of the present invention, and FIG. 5 is a feed side view of an external magnetic type brushed linear motor according to another embodiment of the present invention. 4...Bobbin, 5...Next to spiral, 6
・・・・・・Coil, 7・e・lll1e magnet, 8・・
・@0 center ball, 911IIl...York, 12・
■...Magnetic flux gap, 16...Brush, 17...
...Brush, B...Magnetic rotation 1121...
War...Magnet, 22@Fist+1111I Center pole, 2
4... Magnetic flux gap, F... Magnetic circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (3)

[Claims] (1) A coil having a continuous spiral groove formed on the outer peripheral surface of a bobbin made of an electrical insulator, and having an electrically conductive metal in the spiral groove, at least one pair of brushes, and a magnet; Take from the center pole and yoke, and the upper Hj magnet,
A magnetic circuit is formed by the center pole and the yoke, a magnetic flux gap is formed in the magnetic circuit, the coil is provided within the magnetic flux gap, and the pair of brushes are attached to the coil across the magnetic flux gap. Near motor with brush. (2) A brush according to claim 1, wherein a magnetic flux gap is formed in a gap between the center pole and the yoke that constitute the magnetic circuit, and a coil is disposed within the magnetic flux gap, so that the brush is of an internal magnetic type. with linear motor. (3) A linear with plan according to claim 1, wherein a magnetic flux gap is formed in the gap between the magnets constituting the magnetic circuit and the center pole, and a coil is disposed within this magnetic flux gap to form an external magnet type. motor.