JPS59144361A - Composite linear motor - Google Patents

Abstract

PURPOSE:To obtain a composite linear motor which has high common rate and a small size by commonly using the primary side and the secondary side, and altering it to a linear induction motor or a linear pulse motor by switching an exciting coil. CONSTITUTION:A reaction plate 2 which is unitized of the secondary conductor of a linear motor is laid on the center of rails 1, on which a linear motor car travels. This plate 2 is formed in U shape of a bonding material 6 made of aluminum or the like, and enclosed and inserted by forming a partial hole at a base material 5 made of a common steel material. The material 5 and the mounting bracket 8 are secured through a holding bracket 7 to the hole of the material 6, thereby restricting the movement of the material 6 in a perpendicular direction. The thickness t1 of the bracket 7 and the thickness t2 of the material 6 are set to t1>t2, and the materials 5, 6 are axially freely stretchable in longitudinal and widthwise directions.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite linear motor having both functions of a linear induction motor and a linear pulse motor.

In general, linear induction motors have a large starting thrust and braking force, so they are suitable as motors for high acceleration/deceleration, but are not suitable as motors for stopping at fixed points. On the other hand, a linear pulse motor can easily stop at a fixed point and has a function of self-holding the stop position, but its movement speed is slow. In this way, linear induction motors and linear pulse motors have contradictory advantages and disadvantages. There is already a concept of a composite linear motor that combines the two, using a linear induction motor in the high-speed range and a pulse motor in the low-speed range, in order to bring out the advantages of both. Many of them are mechanically combined, each with an independent one.
Even if there is a secondary side, the degree of sharing of excitation coils etc. is low,
Therefore, there is a drawback that the motor becomes large.

This invention was made to eliminate these drawbacks, and by sharing the primary and secondary sides and changing the excitation coil, it is possible to change from a linear induction motor to a linear pulse motor, or vice versa. The purpose of this invention is to provide a compact composite linear motor by increasing the sharing ratio of excitation coils.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the composite linear motor of the present invention, not showing the main parts, and FIG. 2 is a sectional view thereof. 1 is a flat plate 2
On the next side, 8 pieces each (not limited to 8 pieces)
Equipped with pole #ji3 of tc and two primary sides 2-1.2-2
are arranged with a certain gap between them. Each pole tooth 3 is provided with an excitation coil 4. Further, a detector 8 is provided on the primary side to determine the position of the secondary side. The secondary side 1 has a ladder-like copper frame 7 and a magnetic pole 5.
are fitted at a constant pitch, and the difference between the pitch of the primary pole teeth 3 and the pitch of the magnetic poles 5 is 1/4 of the pitch of the magnetic poles 5 in this embodiment. Further, holes 6 are provided between adjacent magnetic poles 5 at every other pole in order to improve heat dissipation.

Next, the operation of this compound linear motor will be explained. When used as a linear induction motor, the primary side 2 in Fig. 2
-1, there are eight coils (a to h represent the coil numbers), so if the power source is two-phase AC, (a, b) (c, d), (
In the groups e, f') and (g, h),
If the power source is 4-phase AC, (a, b, c, d) (e,
If two-phase and four-phase alternating current are supplied to the groups f, g, h), respectively, they will operate as a normal linear induction motor using the front coil. If the power supply is 3 phase,
For example (a, b, c), (d.

Supply current to the groups e, r). In this case, six coils will be used. Next, to explain the case of using it as a linear pulse motor with reference to Fig. 2, coils a and e, a = and e' are connected in the direction of the magnetic path or in the direction of the arrow, and this group is made the first phase, and the same and the group of coils b and f, b' and f' is the second phase, and the coil C
and 9, take the group of C' as the third phase and take the coil d,
When the group d- and 11- is set as the fourth phase, and a pulse current is passed from the first phase to the second phase, third phase, and fourth phase in order, 1
If the secondary side is fixed, the secondary side will step to the right by 1/4 of the pitch of the magnetic pole 5 for each phase, and will move to the right by 1 pitch of the magnetic pole 5 in the fourth phase. , primary pole teeth and 2
Since the relative position of the magnetic pole on the next side returns to its original position, this process can be repeated to move the secondary side to a desired position. If the order of pulse currents supplied to each phase is reversed, the movement direction of the secondary side will be reversed.

Regarding the control device for a composite linear motor of the present invention, Part 3
It is shown in block diagram form in the figure. That is, it issues a command to the drive circuit to perform optimal driving based on the provided movement information. FIG. 4 is a diagram showing the speed control method of the composite linear motor of the present invention. That is, during acceleration, low speed and deceleration movement (S-+A-+D-)D), it is controlled as a linear induction motor (LIM), and during deceleration (
D-+E) is controlled as a linear pulse motor (LPM).

As described above, the present invention differs from conventional compound linear motors in that it shares the primary and secondary sides and can be changed to a linear induction motor or a linear pulse motor by switching the excitation coil. Since the sharing rate is high, a compact composite linear motor can be provided.

- Note that the present invention is not limited to the above-mentioned embodiments, and may be implemented in other embodiments by making appropriate design changes.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of this calling compound linear motor. 2 is a sectional view of FIG. 1, FIG. 3 is a block diagram of the control device, and FIG. 4 is a diagram showing a speed control method. (Explanation of the symbols representing the main parts of the drawing) 1...Secondary side 2-'1.2-2...Primary side 3...
Pole tooth 4...Exciting coil 5...Magnetic pole
6... Opening (hole) 7... Secondary side frame
8...Detector patent applicant A Co., Ltd.
Mada 1 Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) a common secondary side, a common primary side having at least 8 pole teeth facing each other across the common primary side;
1. A composite linear motor comprising a control device that supplies pulsed current or multiphase alternating current to the next side. (2) The composite linear motor according to claim 1, wherein a large number of holes are provided at equal intervals on the secondary side.