JPS6051349B2 - How to make a rotor for a permanent magnet synchronous machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a rotor for a permanent magnet synchronous machine in which the conductor grooves of the starting squirrel-cage winding are skewed.

Conventionally, the magnetic iron plates that make up the core of the rotor of a permanent magnet synchronous machine were formed in the same shape, so attempts were made to improve the starting characteristics by adding a skew to the conductor grooves of the starting squirrel cage winding. As a result, the permanent magnet mounting space is also skewed, and the permanent magnet must be formed into a special non-linear shape, making manufacturing difficult.

For this reason, conventionally the stator side was skewed, but in this case, it is difficult to mechanize the wire assembly work, and it has to be done manually, which increases the number of man-hours.

In view of this point, the present invention is designed to skew only the conductor grooves of the rotor, and for this purpose, the relative position between the conductor grooves of each magnetic iron plate constituting the iron core and the space for mounting seven permanent magnets is adjusted. It is necessary to punch out the parts one after another, but in this case, the biggest problem is that if the steel plate is divided into multiple parts using the slit part to prevent short circuit between the poles of the permanent magnet as the dividing part, as in the past, the punching would be difficult. If the order of the iron plates is not strictly controlled, it will be difficult to assemble the iron core.

The present invention solves this problem.

That is, in the present invention, the positions of the winding conductor grooves of each magnetic iron plate constituting the iron core and the space for mounting a permanent magnet are punched out at a predetermined angle in the circumferential direction, and the inner periphery of the space for mounting the permanent magnet is punched out. The slits on the side maintain the same relative position with the permanent magnet mounting space for each iron plate, and the slits on the outer circumferential side maintain the same relative position with either the winding conductor groove or the permanent magnet mounting space for each iron plate. It is characterized in that it is punched and the slit portion is provided with a connecting portion that is easily magnetically saturated with a small amount of magnetic flux, so that the slit portion is used as a dividing portion to prevent each steel plate after punching from being separated. . 1 to 4 show an embodiment of the present invention. Reference numeral 1 denotes a rotor core, which has conductor grooves 2 for squirrel-cage windings on its outer periphery, and a permanent magnet mounting section in its middle. It has a space 3, and has an outer slit 4 extending from this space 3 to the outer periphery through the conductor groove 2, and an inner slit 5.
is provided at its inner peripheral end with a connecting portion 6 that is easily magnetically saturated by a small amount of magnetic flux.

The conductor groove 2 and the outer circumferential slit 4 are offset to one side of the space 3 at one end of the core 1 with respect to the permanent magnet mounting space 3, as shown in FIG. As shown in the figure, it is located on the center line of the space 3, and at the other end of the iron core, it is located on the opposite side of the space 3 as shown in FIG.
It is skewed by one slot so that it is off to the side. In order to configure the iron core in this way, we punched out the permanent magnet mounting space 3, the winding conductor groove 2, and the slits 4, 5 in each magnetic iron plate that makes up the iron core! First, the permanent magnet mounting space 3 and the inner slit 5 are punched out using one stamp or notching, and then the conductor groove 2 and the outer periphery slit 4 are punched out for each iron plate with respect to the permanent magnet mounting space 3. The punch is punched out by sequentially shifting the position at a predetermined angle in the circumferential direction.

At this time, in the case of 4-notching work, slit 4 on the outer circumference side
will be punched out in a separate step. Alternatively, contrary to the above, the conductor groove 2 and the outer circumference side slit 4 may be punched out first, and then the permanent magnet mounting space 3 and the inner circumference side slit 5 may be punched out with their positions sequentially shifted. Since each magnetic iron plate that has been punched out has a connecting portion 6, it is not separated using the slit portions 4 and 5 as a dividing portion. A predetermined number of magnetic iron plates punched in this way are stacked on a jig table in the order in which they were punched so that the permanent magnet mounting space 3 is in a straight line using the separately punched guide holes 7. After inserting the permanent magnet 8 into the permanent magnet mounting space 3, both ends of the pin 9 passed through the guide hole 7 are fixed to a contact plate 10 that is applied to both ends of the iron core.
Tighten iron core 1. Thereafter, the cage-shaped conductor 11 accommodated in the conductor groove 2 of the iron core 1 and the end ring 12 connecting both ends of these conductors 11 are provided on the saw body by aluminum die-casting. Then, the non-magnetic shaft 13 is firmly fitted into the inner peripheral hole of the iron core 1. As a result, only the squirrel cage conductor groove is skewed by one slot, and a rotor of a permanent magnet type synchronous machine is obtained.

Note that 14 in the figure indicates a nonmagnetic material filled in the gap of the iron core. 5 and 6 show another embodiment,
It communicates with the permanent magnet mounting space 3, its tip approaches the winding conductor groove 2 via a connecting part 6 that is easily magnetically saturated by a small amount of magnetic flux, and has a width T equal to the spacing between the two adjacent conductor grooves. A slit 4 on the outer circumferential side is provided, and this slit, a space 3 for attaching a permanent magnet, and an inner slit 5 on the inner circumferential side extending from this space to the inner circumference of the iron core are integrated, and the relationship with the winding conductor groove 2 is The positions of the conductor grooves 2 are punched out by sequentially shifting the relevant positions for each iron plate so that the positions are as shown in Figure 5 at both ends of the core, and as shown in Figure 6 at the center. The slot is skewed.

In this way, when punching by notching, it is not necessary to punch out the outer peripheral side slit 4 in a separate step as in the above embodiment, and when punching out one magnetic iron plate, the conductor at the beginning of punching is eliminated. Since the relative position between the groove 2 and the permanent magnet mounting space 3 is not limited, the punching work is facilitated.

In the present invention, as described above, each magnetic iron plate constituting the rotor core is punched out as a single plate through the connecting part 6 provided in the slit for preventing short circuit between the poles of the permanent magnet, so the punching order can be managed easily. Not only is it easy, but it also makes it easier to assemble the iron core.
It is possible to easily manufacture a rotor for a permanent magnet type synchronous machine in which only the conductor grooves are skewed.

Furthermore, since the connecting portion 6 is easily magnetically saturated by a small amount of magnetic flux, the effect of the slit in preventing a short circuit between the poles of the permanent magnet is not reduced.

[Brief explanation of the drawing]

FIG. 1 is a cut-away side view of the rotor of the permanent magnet synchronous machine according to the present invention, FIGS. 2 and 3 are cut-away front views at both ends thereof, and FIG. 4 is a cut-away front view at the center thereof. 5 and 6 are drawings showing other embodiments corresponding to FIGS. 2, 3, and 4, and the same reference numerals in the figures indicate equivalent parts. 1... Rotor core, 2... Squirrel cage winding conductor groove, 3...
... Space for permanent magnet attachment, 4 ... Outer periphery side slit, 5
... Inner periphery side slit, 6... Connecting part, 8... Permanent magnet.

Claims (1)

[Claims] 1. A permanent magnet having permanent magnets in a plurality of spaces in the middle of the core, a squirrel-cage winding on the outer periphery of the core, and a slit for preventing a short circuit between the poles of the permanent magnet. In the rotor of a magnetic synchronous machine, the positions of the winding conductor grooves of each magnetic iron plate constituting the iron core and the space for mounting the permanent magnet are punched out at a predetermined angle in the circumferential direction. The slits on the inner circumference side of the space maintain the same relationship position with the permanent magnet mounting space for each iron plate, and the slits on the outer circumference side maintain the same relationship position with either the winding conductor groove or the permanent magnet mounting space for each iron plate. In order to prevent each steel plate after punching from being separated at the slit part as a dividing part, a connecting part that is easily magnetically saturated with a small amount of magnetic flux is provided at the slit part, and in this way, the punching A method for manufacturing a rotor for a permanent magnet type synchronous machine, characterized in that a predetermined number of magnetic iron plates are stacked so that the permanent magnet mounting space is linear, and conductor grooves are skewed. 2. A connecting part that is easily magnetically saturated is provided at the inner peripheral end of the slit on the inner peripheral side of the permanent magnet mounting space, and the outer peripheral slit communicating with the permanent magnet mounting space and the conductor groove communicating therewith are connected to each other. A method for manufacturing a rotor for a permanent magnet type synchronous machine according to claim 1, wherein each iron plate is punched out so as to maintain the same relative position. 3 A permanent magnet mounting space, an inner slit extending from this space to the inner periphery of the iron plate, and both adjacent conductors that communicate with the above space and are adjacent to each other through a connecting part whose tip is easily magnetically saturated with the conductor groove. Manufacture of a rotor for a permanent magnet type synchronous machine according to claim 1, in which slits on the outer circumferential side having a width approximately equal to the interval between the grooves are punched out so that they maintain the same relative position for each iron plate. Method.