US 11,735,970 B2
Short-circuit generator
Haruyuki Kometani, Tokyo (JP); Ryoji Miyatake, Tokyo (JP); Naoyoshi Mori, Tokyo (JP); and Yuta Saito, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/620,984
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jul. 16, 2019, PCT No. PCT/JP2019/027896
§ 371(c)(1), (2) Date Dec. 20, 2021,
PCT Pub. No. WO2021/009837, PCT Pub. Date Jan. 21, 2021.
Prior Publication US 2022/0360127 A1, Nov. 10, 2022
Int. Cl. H02K 3/487 (2006.01); H02K 3/16 (2006.01)
CPC H02K 3/16 (2013.01) [H02K 3/487 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A short-circuit generator which comprises a rotor and a stator located around an outer periphery of the rotor so as to enclose a rotor central axis thereof, said stator having stator slots in which windings are placed, and said stator slots each having a depth in a radial direction perpendicular to the rotor central axis whose ratio divided by a width of the stator slot in a direction perpendicular both to the radial direction and a direction of the rotor central axis, is less than three,
wherein the rotor comprises: a rotor core in which plural magnetic poles and plural rotor slots are formed; a field winding placed in each of the rotor slots; a metallic damper bar placed in each of the rotor slots on an outer periphery side of the field winding; and a metallic wedge placed in each of the rotor slots on an outer periphery side of the damper bar and connected to the damper bar; and
wherein a damper-bar height that is a height of the damper bar in the radial direction is less than a wedge height that is a height of the wedge in the radial direction, and
the rotor includes, each as one of the rotor slots, a rotor slot in which the wedge of a first material is placed, and a rotor slot in which the wedge of a second material that is lower in electric conductivity than the first material is placed.