JPH02184246A - Rotor winding structure for brush motor - Google Patents

Abstract

PURPOSE:To enable reduction of rotary noise, frictional torque of shaft and cost by short-circuiting respective windings separated by predetermined mechanical angle and having identical potential through short circuit lines thereby reducing the number of brush. CONSTITUTION:Rotor winding 49 of a brush motor comprises windings 20-37, where a first commutator segment 1 and a 10th commutator segment 10, a second commutator segment 2 and a 11th commutator segment 11, a third commutator segment 3 and a 12th commutator segment 12... and a 9th commutator segment 9 and a 18th commutator segment 18 are short-circuited sequentially through respective short circuit lines 50-58 in order to short-circuit the windings 20-37 separated one another by 180 deg. mechanical angle and having identical potential. By such arrangement, the number of brushes in contact with the commutator can be halved when compared with the number of magnet poles.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a rotor winding structure in a brush motor.
In particular, the present invention relates to novel improvements for reducing the number of brushes, reducing noise during rotation, reducing shaft friction torque, and reducing costs.

b. Conventional technology There are various types of rotor windings in this type of brush motor that have been used in the past, but the typical configuration is as follows:
Although the name of the document showing the winding structure is not disclosed here, the configuration shown in FIG. 3 and manufactured in-house by the present applicant can be disclosed.

That is, those indicated by numerals 1 to 18 in FIG. 3 are commutator segments provided on a rotating shaft (not shown), and the first volume &120 wound from the first commutator segment 1 is connected to each slot 1'. ~18' are connected to the second commutator segment 2 by jumping over three slots 18' to 2', and each of the other windings 21 to 37 is connected to the other commutator segment by jumping over three slots as described above. each connected to segment 18.

Therefore, each of the commutators 1 to 18 and each of the windings 20 to 37 are independently wound.

C1 Problems to be Solved by the Invention Since the rotor winding structure of the conventional brush motor was configured as described above, it had the following problems.

That is, for example, in the case of a DC motor with a 4-pole magnet structure, 4 brushes are required, and 88i!
In the case of a DC motor with a magnetic structure, eight brushes are required, which generates a large amount of noise during rotation.
Furthermore, since the number of brushes in a motor having an even number of slots cannot be reduced, the shaft friction torque becomes larger than that of a two-brush motor, and the cost also increases.

The present invention has been made to solve the above-mentioned problems, and is particularly directed to a brush motor that reduces the number of brushes, reduces noise during rotation, reduces shaft friction torque, and reduces costs. The purpose of the present invention is to provide a rotor winding structure.

d2 Means for Solving the Problems The rotor winding structure of the brush motor according to the present invention has an even number of brushes in contact with a commutator, and the rotor winding is wound around a rotor having an even number of slots. In the rotor, the rotation of the rotor is obtained by controlling the energization to each winding, in which the windings, which are spaced apart at a predetermined angle and have the same potential, are short-circuited with a short-circuit wire, and the number of brushes is reduced by a magnet. This is a configuration in which the number of poles is smaller than the number of poles.

80 action In the rotor winding structure of the brush motor according to the present invention, for example, in the case of a four-pole magnet, the mechanical angle is 18
Rotor windings that are 0 degrees apart and have the same potential are short-circuited with a short-circuit wire, and in the case of an 8-pole magnet, rotor windings that are 90 degrees apart in mechanical angle and have the same potential are short-circuited with a short-circuit wire. The number of brushes that come into contact with the commutator can be made half the number of magnet poles, which can reduce noise during rotation, reduce shaft friction torque, and reduce costs.

f. Embodiments Hereinafter, preferred embodiments of the rotor winding structure in the brush motor according to the present invention will be described in detail with reference to the drawings.

It should be noted that the same or equivalent parts as in the conventional example will be described with the same reference numerals.

Figures 1 and 2 are for showing the rotor winding structure of the brush motor according to the present invention. Figure 1 shows the winding connection port showing the winding structure, and Figure 2 shows the brush motor. FIG.

In the brush motor shown in FIG. 2, the reference numeral 40 is a front cover, and a rear cover 41 is provided at a predetermined distance from the front cover 40.
A case 43 having a stator 42 is provided between and the rear 1141.

Said previous l! A rotary shaft 48 having a rotor 46 and a commutator 47 is rotatably provided between bearings 44 and 45 provided at the rear 1241. Child 47 is comprised of a number of commutator segments 1-18 (shown in FIG. 2).

Further, a brush 47a provided on the front 1240 via a brush holder 47b is provided in contact with the commutator 47.

The rotor winding 49 is constructed as shown in FIG. It is connected to the second commutator segment 2 by jumping over the slots 18' to 2', and each of the other windings 21 to 37 is connected to the three slots 1' to 3', 2' to 4', and 3' in the same manner as described above. ~5'
, 4' to 6', 5' to 7', 6' to 8', . It constitutes the rotor winding 49 of the brush motor.

Further, in the rotor winding 49, the first commutator segment 1 and the tenth commutator segment 10.
Second commutator segment 2 and eleventh commutator segment 11
．． Third commutator segment 3 and twelfth commutator segment 1
2. The 9th commutator segment 9 and the 18th commutator segment 18 are sequentially short-circuited using respective short-circuit wires 50 to 58. As described above, the rotor winding structure of the brush motor according to the present invention is such that the windings 20 to 37 of the same potential, which are located at opposite positions of 180 degrees in mechanical angle, are successively short-circuited by the respective short-circuit wires 50 to 58. Conventionally, in the case of a 4-pole magnet, 4
Although the brush 47a of g is required, only two brushes 47a are required.

Furthermore, in the case of an 8-pole magnet, only 4 brushes 47a are required, whereas 8 brushes were conventionally required.

g8 Effects of the invention Rotor winding in the brush motor according to the invention! ! The structure is
With the above configuration, the following effects can be obtained.

In other words, since the rotor windings, which are spaced at a predetermined mechanical angle and have the same potential, are short-circuited with a short-circuit winding, the number of brushes that come into contact with the commutator can be half the number of magnet poles, and the rotation It is possible to obtain reductions in noise during operation, reductions in shaft friction torque, and cost reductions.

[Brief explanation of the drawing]

Figures 1 and 2 are for showing the rotor winding structure of the brush motor according to the present invention. Figure 1 is a winding connection diagram showing the winding structure, and Figure 2 is a cross section showing the brush motor. figure,
FIG. 3 is a winding connection diagram showing a conventional winding structure. 1' to 18', slots 520 to 37 are windings, 46 is a rotor, 47 is a commutator, 47a is a brush, 49 is a rotor winding, and 50 to 58 are short circuit wires. (47) is the commutator (47o) and the brush (49) is the green after the rotor.

Claims (3)

[Claims] (1). An even number of brushes (47a) are brought into contact with a commutator (47), and each winding (49) is wound around a rotor (46) having an even number of slots (1'-18'). By controlling the energization to 20 to 37),
In the brush motor configured to obtain rotation of the rotor (46), windings (20 to 37) that are spaced apart from each other at a predetermined mechanical angle and have the same potential are short-circuited by short-circuit wires (50 to 58);
A rotor winding structure in a brush motor, characterized in that the number of brushes (47a) is smaller than the number of magnet poles. (2). It consists of a 4-pole magnet configuration, and the mechanical angle is 1
2. The rotor winding structure of a brush motor according to claim 1, wherein the rotor winding structure is 80 degrees. (3). It consists of an 8-pole magnet configuration, and the mechanical angle is 9.
2. The rotor winding structure of a brush motor according to claim 1, wherein the rotor winding structure is 0 degrees.