JPH04105530A - Dc brushless servomotor - Google Patents

Abstract

PURPOSE:To obtain a DC brushless servomotor having high efficiency and high performance by providing a plurality of cutouts in the bore of a yoke of a stator core, and setting a slot opening to a special value or less in a stator provided with a concentric winding at tees engaged with the cutouts. CONSTITUTION:Coils 2 are wound in tees 1a of a stator core, and insulated between both by slot insulators 3. Concentrically wound tees 1a are engaged with the yoke 1b of a stator to form the stator, and a slot opening is set to 0.5mm or less. Accordingly, the coil space factor of the slot 4 can be raised to 60% or more, Carter coefficient of the stator is increased, and variation in a magnetic reluctance of a rotor can be reduced. Accordingly, stator loss can be reduced, and a cogging torque can be reduced by half.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a DC brushless servo motor used for driving FA equipment and various automatic machines.

2. Description of the Related Art An example of a conventional DC brushless servo motor will be described below with reference to the drawings.

As shown in FIG. 3, the stator of a conventional brushless motor includes a stator core 1, a plurality of teeth IC integrally provided inside the stator core 1, and an inner diameter of the stator core 1. It is composed of a slot insulator 3 that is installed upside down except for the wall and the rotor (not shown) facing surface of the teeth portion, and a coil 2 that is wound on the teeth IC. Conventionally, the coil 2 was wound by inserting a winding machine tool into the slot 4.

Problems to be Solved by the Invention However, according to the above-mentioned conventional method for winding the coil 2, as shown in FIG. There was a drawback that the coil space factor in the slot 4 was approximately 25%, which was very temporary, because the wire could not be wired.

Furthermore, the gap on the inner diameter side of the slot portion, that is, the slot open 5, had to be made sufficiently large for insertion of the winding machine tool. Therefore, the Carter coefficient of the stator is small (
Therefore, there were problems in that the change in magnetic resistance was large, resulting in large stator loss and large cogging torque.

In view of the above-mentioned problems, the present invention provides a highly efficient and high-performance DC brushless servo motor by increasing the coil space factor of the slot and the Carter coefficient of the stator with a simple configuration, and further reducing the change in magnetic resistance. The purpose is to provide

Means for Solving the Problems The DC brushless servo motor of the present invention has a plurality of notches in the inner diameter of the yoke portion of the stator core, and has teeth fitted in the notches that are fixed with concentrated windings. This is a child with a slot oven of 0.5 m+ or less.

Function: The stator of the DC brushless servo motor of the present invention has a structure in which the stator core is divided into the teeth and the yoke, and the concentratedly wound teeth fit into the yoke. , the coil space factor of the slot can be increased to 60% or more. Further, by making the slot oven smaller, increasing the Carter coefficient of the stator, and reducing the change in magnetic resistance with respect to the rotor, it is possible to reduce stator loss and reduce cogging torque.

Embodiment FIG. 1 shows a concentrated winding teeth portion of a stator of a DC brushless servo motor according to an embodiment of the present invention. A coil 2 is wound around the teeth 1a of a stator core, and is insulated by a slot insulator 3 inserted between the two.

The concentratedly wound teeth portion shown in FIG. 1 is fitted into the yoke portion 1b of the stator to form a stator, as shown in FIG. 2, and the length of the slot oven 5 is 0.5 m or less. Others are the same as the conventional example.

Here, many experiments have shown that when the slot oven 5 is made larger than 0.5 mm, the Carter coefficient of the stator becomes small (and the change in magnetic resistance becomes large, and the loss and cogging torque of the stator become large). confirmed.

As described above, by dividing the stator core of the DC brushless servo motor into the teeth portion 1a and the yoke portion 1b, the winding can be concentrated on the teeth portion 1a, and the coil 2 can be easily wound in an aligned manner. . Therefore, the coil wire type ratio of the slot 4 can be increased to 60% or more.

Further, by making the slot oven 5 smaller than 0.5 m, the Carter coefficient of the stator can be increased and the change in magnetic resistance with respect to the rotor can be reduced.

As described above, the DC brushless servo motor of the present invention has the following advantages:
The stator core is divided into teeth portions and yoke portions, and the concentrated windings are fitted into the teeth portions and yoke portions, so that the coil space factor of the slot can be increased to 60% or more. In addition, by reducing the slot oven to 0.5 mm or less, it is possible to increase the Carter coefficient and reduce changes in magnetic resistance to the rotor, thereby reducing stator loss and cogging. The torque can be halved. Therefore, the stacking thickness of the stator can be reduced, which is extremely advantageous in practical use for making DC brushless servo motors compact, high output, and high performance.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the teeth portion of the stator of a DC brushless servo motor according to an embodiment of the present invention, FIG. 2 is a perspective view of the stator, and FIG. 3 is a perspective view of the stator of a conventional DC brushless servo motor. The perspective view and FIG. 4 are plan views of the slot portions of the stator. DESCRIPTION OF SYMBOLS 1... Stator core, 1a... Teeth part of stator core, 1b... Yoke part of stator core, 2... Coil, 3... ... Slot insulator, 4. Old... Slot, 4a... Winding machine tool insertion part, 5... Slot oven. Name of agent: Patent attorney Haruaki Koebi

Claims (1)

[Claims] A rotor with a plurality of magnets arranged and fixed at approximately equal intervals on the shaft is equipped on the inner diameter of the stator, a plurality of notches are provided on the inner diameter of the yoke portion of the stator core, and teeth portions are fitted into the notches. A DC brushless servo motor with a stator having a concentrated winding and a gap between the tips of the teeth on the inner diameter side of 0.5 mm or less.