JPS5922780Y2 - Coreless motor rotor - Google Patents

Description

[Detailed description of the invention] As described in Japanese Patent Publication No. 38-2151, the coil wire is repeatedly folded and wound into a cylindrical shape so that the current direction flowing through the coil wire is alternately in a different direction with respect to the stator magnetic field. The rotated cylindrical coil has a thin coil wall and the tap is located at the folded part, so it is ideal as a coil for the rotor of a coreless motor, and the insulation coating of the coil wire in the part corresponding to the tap of this cylindrical coil is peeled off. The conductive part is used as a tap to form a conductive part, and the conductive part is connected and coupled to the segments of a commutator in which a plurality of segments are arranged radially on a disc-shaped coil holding plate as a tapless cylindrical coil. It is possible to form an inverted cup-shaped rotor.

However, with such an inverted cup-shaped rotor using tapless cylindrical coils, if a gap is created between the conductive part of the cylindrical coil and the segment terminal part of the commutator due to tolerances during manufacturing, the connection and connection by soldering may occur. This makes it difficult to process the product, resulting in poor product yield.

Therefore, as shown in the drawings, the present invention involves repeatedly winding the wire in a folded cylindrical shape so that the direction of the current flowing through the coil wire is alternately in the opposite direction with respect to the stator magnetic field. The conductor is exposed by peeling off the insulation coating of the coil wire corresponding to , and the upper end of the tapless cylindrical coil A is bent inward, in which the exposed conductor itself or a solder layer is provided on the exposed conductor to form the conductive part a. , a commutator B in which a plurality of segments b having terminal portions 2 are arranged radially on the upper surface of a disk-shaped coil holding plate d made of synthetic resin with a rotary shaft 1 protruding from the center of the lower surface is attached to the above-mentioned tapless cylindrical coil. The edge of the terminal part 2 of each segment and the conductive part a are soldered and connected to the upstream inner circumferential body of A, respectively, and the commutator B and the tapless cylindrical coil A are connected and fixed to form an inverted cup shape. The rotor R is configured as follows.

As explained above, this invention bends the upper end of the tapless cylindrical coil inward to eliminate the gap between the terminal edge of the segment and the conductive part, making it easier to connect by soldering and improving product yield. It has a good practical effect.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the soldered state, and Fig. 2 is a perspective view of the finished product. A is a tapless cylindrical coil, a is a conductive part, B is a commutator, b is a segment, and 2 is a terminal part.

Claims (1)

[Scope of utility model registration request] The coil wire is repeatedly folded and wound in a cylindrical shape so that the direction of the current flowing through the coil wire is alternately in a different direction with respect to the stator magnetic field, and a conductive part is formed in the coil wire corresponding to the tap in the folded portion. A tapless cylindrical coil and a commutator in which multiple segments are arranged radially on the top surface of a synthetic resin disk-shaped coil holding plate with a rotating shaft protruding from the center of the bottom surface are installed, with the top end of the tapless cylindrical coil facing inside. A rotor for a coreless motor in which a gap between a bent conductive part and an edge of a terminal part of a segment is eliminated, the conductive part and the terminal part are soldered, and a commutator is coupled and fixed to an inner circumferential shell of an upper end of a tapless cylindrical coil.