JP2006174580A - Armature insulation of commutator motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide armature insulation, capable of attaining size reduction in a commutator motor, stable quality for high efficiency by reducing the thickness of a tubular portion of the armature insulation according to the increase in the winding wire diameter of an armature, in order to provide size reduction and high efficiency for the commutator motor, and by increasing the winding wire diameter, while restraining the armature winding volume of the commutator motor, thus preventing cracks at the tubular portion when pressing into the shaft. <P>SOLUTION: The inside diameter of the tubular portion of the armature insulation formed by resin is made larger than an outer periphery, including a vertical line height of a shaft, and the inside diameter of an end insulator portion is pressed in and fixed at the vertical line of the shaft, to prevent cracks in the armature insulation generated at pressing in and fixing of the armature insulation at the shaft. With this constitution, the thickness of the tubular portion of the armature insulation can be reduced, thus restraining increase in the winding volume due to the increase in the winding wire diameter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to armature insulation of a commutator motor used in a vacuum cleaner or the like.

A commutator motor used for a vacuum cleaner is required to be small and highly efficient. By enlarging the winding wire diameter of the armature of the commutator motor, it is possible to suppress an increase in the winding temperature rise due to the miniaturization and increase the efficiency by reducing the copper loss of the armature winding. . If the coil diameter of the armature is increased while the commutator motor is downsized, the volume of the armature winding increases. There arises a problem that the insulation distance from the wire is insufficient. In order to solve this shortage of insulation distance, the thickness of the armature insulation cylinder formed by resin molding provided for insulation between the armature winding and the shaft and the iron core is reduced. A method of suppressing an increase in line volume is taken. (For example, see Patent Document 1)
Japanese Patent Laid-Open No. 11-27907

Solves the shortage of insulation distance between armature windings and non-charged parts such as brackets made of electrogalvanized steel sheet, which is caused by expanding the armature winding wire diameter while reducing the size of the commutator motor Therefore, a method is adopted in which the thickness of the cylinder portion of the armature insulation formed by resin molding provided for insulation between the armature winding and the iron core is reduced to suppress an increase in the winding volume. . It is necessary to maintain the positional relationship with the armature core until the step of winding the armature winding, and for this reason, it is generally press-fitted and fixed to a streak provided on the shaft. When the thickness of the armature insulation is reduced, the inner diameter dimension of the armature insulation cylinder part formed by resin molding and the height of the reinforcement provided on the shaft when pressed into the reinforcement provided on the shaft. Due to the variation in the size, the armature insulation tube portion may be cracked, and it is difficult to reduce the thickness of the simple armature insulation portion. If the inner diameter of the armature insulation is too large relative to the outer diameter of the shaft, the armature insulation may not be fixed to the shaft, and movement may occur before the winding process. The problem about the crack of armature insulation appears notably when a thermosetting resin is used for the material of armature insulation.

  In order to solve the above problems, in the armature insulation of the commutator motor of the present invention, the inner diameter dimension of the hole into which the shaft is inserted is set larger than the outer diameter dimension of the shaft including the raised height provided on the shaft. The inner diameter dimension of the hole is made smaller than the outer diameter dimension of the shaft partially including the raised height. By press-fitting only the inner diameter portion of the hole, which is partially reduced in this way, into the shaft streak, it is possible to reduce the thickness of the armature insulation tube while preventing the armature insulation from cracking. Also, the inner diameter dimension of the simplified part that insulates the shaft from the armature winding is made larger than the outer diameter dimension including the height of the shaft, and the inner diameter dimension of the end insulator that insulates the iron core from the armature winding. By making it smaller than the inner diameter dimension of the simplified part and press-fitting and fixing only the end insulator part to the shaft streak, it is possible to further improve the reliability against cracking due to thinning of the cylindrical part of the armature insulation. it can.

  According to the armature insulation of the commutator motor of the present invention, it is possible to prevent cracking of the armature insulation due to thinning of the cylindrical portion of the armature insulation. Expansion becomes possible, and the commutator motor can be reduced in size and efficiency.

  In the armature insulation in which the cylindrical part for insulating the shaft and the armature winding and the end insulator part for insulating the iron core and the armature winding are formed by resin molding, the inner diameter dimension of the simplified part is The outer diameter of the end insulator portion is made larger than the inner diameter of the cylindrical portion, and the inner diameter of the end insulator portion is made smaller than the inner diameter of the tube portion.

  Hereinafter, the armature insulation of the commutator motor of the present invention will be described in detail based on one embodiment with reference to the drawings. FIG. 1 is a half sectional view of an armature of a commutator motor for a vacuum cleaner using armature insulation in an embodiment of the present invention, and FIG. 2 is a sectional view of armature insulation in an embodiment of the present invention. A figure and an enlarged view are shown.

  1 and 2, reference numeral 1 denotes an armature core made of laminated electromagnetic copper plates, which is fixed to the shaft 2 by being press-fitted and fixed to a plurality of braces 3 having a height of several tens of microns provided on the shaft 2. Yes. Reference numeral 4 denotes an armature insulation formed by resin molding, which has a hole for insertion into the shaft 2, and is substantially the same as the cylindrical portion 4 b and the armature core 1 for insulating the shaft 2 and the armature winding 5. It consists of an end insulator part for insulating the armature core 1 and the armature winding 5 in the same shape. Until the winding process of the armature winding 5 is completed, the armature insulation 4 needs to be fixed to the shaft 2, and generally a streak provided on the shaft 2 to fix the armature core 1. 3 is shared and press-fitted and fixed. In the cylindrical part 4b of the armature insulation 4, the inner diameter dimension of the hole 4a is made larger than the outer diameter dimension of the shaft 2 including the height of the reinforcing bar 3, and in the end insulator part 4c, the inner diameter dimension of the hole 4a is set to the height of the reinforcing bar 3. By reducing the outer diameter of the shaft 2 including the shape, it is configured to be press-fitted and fixed to the shaft 2 only at the inner diameter of the inner end insulator portion of the hole 4a. By setting it as such a shape, the crack of the armature insulation 4 which is easy to generate | occur | produce when press-fixing the armature insulation 4 to the axis | shaft 2 can be prevented. This is also effective in reducing the thickness of the cylindrical portion 4b of the armature insulation 4. When the armature insulation 4 is formed by molding a thermosetting resin, the effect is more remarkable. Further, the inner diameter dimension of the hole 4 a of the armature insulation 4 is made larger than the outer diameter dimension of the shaft 2 including the height of the braiding 3, and the inner diameter dimension of the hole 4 a is partially outside the shaft 2 including the height of the braiding 3. The effect of preventing the armature insulation 4 from cracking can also be expected by reducing the diameter.

  The armature insulation of the commutator motor according to the present invention can increase the wire diameter of the armature winding while suppressing an increase in the volume of the armature winding of the commutator motor. It is optimal for efficiency and is useful for applications such as vacuum cleaners that require weight reduction and high output.

The figure which shows the armature of the commutator motor using the armature insulation in Example 1 of this invention. Half sectional view and enlarged view of armature insulation in Example 1 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Armature iron core 2 Axis 3 Bracing 4 Armature insulation 4a Hole 4b Simplified part 4c End insulator part 5 Armature winding

Claims (2)

It has a simple part to insulate the shaft from the armature winding, and a substantially armature core-shaped end insulator part to insulate the armature core from the armature winding. In the armature insulation having a hole for insertion into a shaft provided with a plurality of reinforcing bars, the inner diameter dimension of the hole is made larger than the outer diameter dimension of the shaft including the height of the reinforcing bars, and the inner diameter of the hole is partially An armature insulation for a commutator motor, characterized in that the outer diameter of the shaft including the height of the streaks is reduced. In claim 1, the inner diameter dimension of the hole in the simplified portion is made larger than the outer diameter dimension of the shaft including the height of the streak, and the inner diameter dimension of the hole in the end insulator portion is made smaller than the outer diameter dimension of the shaft including the height of the strut. The armature insulation of the commutator motor characterized by the above.

Images