Rotor core having bridges connection magnetic pole and method of manufacturing the same
AssigneesToshiba Ha Products Co., Ltd., Toshiba Consumer Marketing Corporation, Mitsui High-Tec, Inc.
InventorsTsuyoshi Shiga, Noboru Shibata
Life of this patent
Estimating the term…
Abstract
A rotor core of a rotating electrical machine formed by stacking a plurality of blanks blanked from a steel sheet, the blank having a yoke, a magnetic pole portion confronting the yoke, and a magnet insertion hole positioned between the yoke and the magnetic pole portion, the magnetic pole portion having a projection projecting circumferentially at two circumferential sides thereof.
Claims8
A rotor for a rotating electrical machine comprising:
- a rotor core made of a stack of a plurality of blanks of steel sheet including a yoke, a magnetic pole portion confronting the yoke, and a magnet insertion hole interposed between the yoke and the magnetic pole portion,
- wherein the stack includes at least one blank having a bridge connecting the yoke and the magnetic pole portion and one or more blanks having the bridge blanked off, and
- a magnet inserted to the magnet insertion hole,
- wherein a projection is configured to project circumferentially beyond a width of the bridge and is formed at two circumferential sides of the magnetic pole portion and;
- wherein a resin is molded between the magnetic pole portions and within a space of the stack of blanks defined by the blanked off bridge of the rotor core with the magnet being inserted to the magnet insertion hole.
A method of manufacturing a rotor of a rotating electrical machine including a rotor core made of a stack of a plurality of blanks including a yoke, a magnetic pole portion confronting the yoke, a magnet insertion hole interposed between the yoke and the magnetic pole portion, a magnet inserted into the magnet insertion hole, the method comprising:
- forming a caulked portion in a magnetic pole corresponding portion that corresponds to the magnetic pole of a steel sheet for forming a core;
- defining a magnet insertion hole by blanking a portion between a yoke corresponding portion that corresponds to the yoke and the magnetic pole corresponding portion of the steel sheet;
- blanking the yoke corresponding portion, the magnetic pole corresponding portion, and a bridge corresponding portion that connects the yoke corresponding portion and the magnetic pole corresponding portion from the steel sheet to form blanks;
- stacking the plurality of blanks to form the rotor core,
- inserting the magnet into the magnet insertion hole of the rotor core;
- and
- molding a resin between the magnetic pole portions and within a space of the stack of blanks defined by the blanked off bridge of the rotor core with the magnet being inserted to the magnet insertion hole,
- wherein the blanking forms a projection projecting circumferentially beyond a width of the bridge at two circumferential sides of the magnetic pole portion by blanking the magnetic pole corresponding portion.
A method of manufacturing a rotor of a rotating electrical machine including a rotor core made of a stack of a plurality of blanks including a yoke, a magnetic pole portion confronting the yoke, a magnet insertion hole that is interposed between the yoke and the magnetic pole portion, a magnet inserted into the magnet insertion hole, the method comprising:
- cutting a bridge corresponding portion connecting a yoke corresponding portion that corresponds to the yoke and a magnetic pole corresponding portion that corresponds to the magnetic pole portion and forming a caulked portion in the magnetic pole corresponding portion of a steel sheet for forming a core;
- defining a magnet insertion hole by blanking a portion between the yoke corresponding portion and the magnetic pole corresponding portion of the steel sheet;
- blanking the yoke and the magnetic pole portion from the steel sheet to form a blank;
- and
- stacking a plurality of blanks to form the rotor core;
- inserting a magnet into the magnet insertion hole of the rotor core;
- and
- molding a resin between the magnetic pole portions and within a space of the stack of blanks defined by the blanked off bridge of the rotor core with the magnet being inserted to the magnet insertion hole;
- wherein the blanking forms a projection projecting circumferentially beyond a width of the bridge at two circumferential sides of the magnetic pole portion by blanking the magnetic pole portion and
- wherein the stacked blanks include at least one blank having a bridge connecting the yoke and the magnetic pole portion.
Dependencies are inferred from the claim text.