JPH0528943Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a linear motor used for transporting articles through linear motion, and particularly to its winding.

(Prior Art) The windings of a conventional linear motor will be explained with reference to FIG. 9. In the same figure, A shows the arrangement of the windings housed in the slots of the iron core; U, V,
W indicates the phase to which each winding belongs, + and - at the upper right indicate the polarity of the winding, and the number at the lower right indicates the number of windings. Here, since the windings are wound, for example, from + to -, they form a pair of windings. B is the instantaneous current of each phase when the windings are arranged like this (U phase current =
1. When W phase current = -1/2, V phase current = -1/2)
These are the magnetomotive force distribution at , and the magnetomotive force distribution obtained by combining these.

The number of turns (number of turns) of the windings arranged in this way was all the same.

(Problem that the invention attempts to solve) However, in the above arrangement, three poles appear as a composite magnetomotive force at B, but the N pole component is almost twice the S pole component and is not balanced, so there is no balance. The leakage becomes leakage magnetic flux and no longer contributes to thrust. Furthermore, since the number of series conductors per phase is not equal for each phase, the impedance becomes unbalanced, and the current becomes unbalanced. Furthermore, in the case of a linear motor, there is a problem in that when there is a sharp change in the magnetic flux at both ends, as seen in the composite magnetomotive force distribution B, a large braking force is generated due to this.

Therefore, the present invention aims to solve the above-mentioned problems and provide an efficient linear motor.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the linear motor of the invention includes a comb-shaped iron core having teeth of a secondary conductor that are approximately equally close to each other to both ends thereof; It is housed in the slot of the iron core, and single-layer windings of the same phase are arranged at both ends of the core, and the number of turns of the winding for each one phase at each end is equal to that of each of these windings and the winding of the other phase adjacent to it. The wire winding is approximately half the number of windings of the wire.

(Function) With the above-described configuration, the N-pole component and the S-pole component of the composite magnetomotive force can be balanced, and the number of series conductors per phase is approximately equal for each phase.
Furthermore, since the magnetomotive force at both ends can be reduced to alleviate changes in magnetic flux and reduce the braking force, it is possible to improve efficiency by increasing propulsive force.

(Example) Examples of the present invention will be described below with reference to FIGS. 1 to 8. FIG. 1 is a diagram for explaining one embodiment of the present invention, where A and B indicate the arrangement of each winding, and C indicates the magnetomotive force of each phase and their combined magnetomotive force.
The pitches of the windings are, for example, slot numbers #1 to #4 as shown in A. In addition, as shown in B, the number of windings for each of the U phases, which are the phases at both ends, is a slot in which the windings for one phase at both ends are stored,
That is, the windings stored in slot numbers #1 to #4 and the windings stored in slot numbers #7 to #10 have a winding number of 5 (number of turns 5), and the windings stored in slot numbers #1 to #4 and the windings stored in slot numbers #7 to #10 have a winding number of 5 (number of turns 5), and the other U-phase, W-phase, and V The phase has 10 turns (10 turns). Therefore, the number of series conductors per phase is equal for each phase. Furthermore, the polarity of the windings changes for each adjacent phase. The instant (U) in the winding arranged in this way
Phase current = 1, W phase current = -1/2, V phase current = -1/
2) shows the magnetomotive force distribution of each phase and their composite magnetomotive force distribution. This composite magnetomotive force distribution has three poles like the conventional example shown in Fig. 9, but the magnetomotive force at both ends has decreased, and the sum of the N-pole components and the sum of the S-pole components are balanced. .

As explained above, in the configuration of the above embodiment, the number of windings of the windings for one phase at both ends is approximately halved, and the number of series conductors per phase is made equal for each phase, so the impedance and current are also equal. In addition, since the number of windings at both ends is reduced to lower the magnetomotive force, changes in magnetic flux are alleviated, and the generation of braking force during propulsion can be reduced. Furthermore, since the sum of the north-pole components and the sum of the south-pole components of the composite magnetomotive force are balanced, there is no leakage magnetic flux and efficiency can be improved.

Figure 2 shows the winding layout diagram A when the number of slots is 13 and three-phase, and a certain moment at this time (U phase current =
1, W phase current = -1/2, V phase current = -1/2). In the same figure, as in the first embodiment, the winding pitch is indicated by the slot number #.
1 to #4, the number of windings is the windings stored in the slots for one phase at both ends, that is, slot numbers #1 to #
Windings stored in 4 and slot numbers #10 to #13
The number of windings stored in is 5, and the number of other windings is 5.
It's turning 10. Further, the composite magnetomotive force distribution is also low at both ends, and the sum of N-pole components and the sum of S-pole components are balanced. Therefore, the same effects as in the above embodiment can be obtained.

Figures 3 and 4 each have 16 slots.
This is an example of the winding arrangement in the case of 7 and 7, and the same effect as the above-mentioned embodiment can be obtained.

Also, Figure 5 shows that the number of slots per pole is 2.
In this example of the winding arrangement, the number of slots belonging to the phases at both ends becomes two as shown in the figure, but the same effect can be obtained.

Further, FIG. 6 is a layout diagram for a case where the number of slots is 9 and two phases are used, so that the current flowing through each phase is equal, and the braking force generated at both ends during propulsion can be reduced.

7 and 8 are diagrams for explaining an example of the structure of a general linear motor to which the above-mentioned winding is applied. In FIG. 7, a comb-shaped iron core 2 A linear motor main body 1 consisting of a winding 3 and a winding 3 housed in the main body 1 moves, and FIG. This is a type in which a linear motor main body 5 consisting of a winding 3 moves.

In each of the above-mentioned embodiments, the winding pitches are slot numbers #1 to #4, but other winding pitches can be used as well, and the number of conductors stored in each slot is 5 at both ends and in the center: Although the ratio was set to 10 (1:2), it is sufficient if the ratio is approximately the same as this.

[Effects of the invention] As explained above, according to the invention, the current flowing through each phase is equal, the braking force during propulsion can be reduced, and leakage magnetic flux can also be reduced, making it possible to create a highly efficient linear motor. .

[Brief explanation of the drawing]

Figures 1 to 8 relate to the present invention; Figure 1 is a diagram explaining the winding arrangement and magnetomotive force distribution in the case of 10 slots and 3 phases, and Figure 2 is a diagram for explaining the winding arrangement and magnetomotive force distribution in the case of 13 slots and 3 phases. Figure 3 is a diagram illustrating the winding arrangement and magnetomotive force distribution in the case of 16 slots and 3 phases.
Figure 4 is a winding arrangement diagram with 7 slots and 3 phases. Figure 5 is a diagram explaining the winding arrangement and magnetomotive force distribution with 20 slots and 3 phases. Figure 6 is a diagram explaining the magnetomotive force distribution with 20 slots and 3 phases. 9, a winding arrangement diagram for two-phase, FIG. 7 is a sectional view explaining the structure of a linear motor, FIG. 8 is a partially cutaway diagram explaining the structure of a cylindrical linear motor, and FIG. It is a figure explaining the winding arrangement and magnetomotive force distribution of a conventional example. 1, 1a... linear motor body, 2, 2a...
Iron core, 3, 3a... winding, 4, 4a... secondary conductor.

Claims (1)

[Claims for Utility Model Registration] A comb-shaped iron core having teeth that are almost equally close to the secondary conductor up to both ends thereof, and a single-layer winding of the same phase placed in the slot of this iron core at both ends thereof. , a linear motor characterized in that the number of turns of the winding for each one phase at each end portion is approximately half the number of turns of the winding of the other phase adjacent to each of these windings. .