JPWO2022144967A5 - - Google Patents

Description

The rotor of the present disclosure is an annular rotor core centered on the axis, having a shaft hole at the center in a radial direction centered on the axis, and a magnet insertion hole radially outside the shaft hole. , a permanent magnet inserted into the magnet insertion hole, an end plate made of a non-magnetic material attached to the end face of the rotor core in the direction of the axis, and a balance weight attached to the rotor core via the end plate. The balance weight has a first balance weight portion and a second balance weight portion in order from the rotor core side in the axial direction. The outer peripheral end of the first balance weight portion is positioned radially inside the magnet insertion hole, and the outer peripheral end of the second balance weight portion is positioned radially outside the magnet insertion hole. The inner peripheral end of the second balance weight portion is located radially inside the inner peripheral end of the first balance weight portion.

Claims (11)

an annular rotor core centered on an axis, the rotor core having a shaft hole at the center in a radial direction around the axis, and a magnet insertion hole radially outside the shaft hole;
a permanent magnet inserted into the magnet insertion hole;
an end plate made of a non-magnetic material and attached to the end face of the rotor core in the direction of the axis;
a balance weight attached to the rotor core via the end plate,
The balance weight has a first balance weight portion and a second balance weight portion in order from the rotor core side in the direction of the axis,
an outer peripheral end of the first balance weight portion is located inside the magnet insertion hole in the radial direction;
an outer peripheral end of the second balance weight portion is located outside the magnet insertion hole in the radial direction;
The inner peripheral end of the second balance weight portion is located inside the inner peripheral end of the first balance weight portion in the radial direction.
rotor. The rotor according to claim 1, wherein both the first balance weight portion and the second balance weight portion are made of a magnetic material. The first balance weight portion is made of a non-magnetic material,
The second balance weight portion is made of a magnetic material
A rotor according to claim 1 or 2 . 4. Any one of claims 1 to 3 , wherein a length H1 of the first balance weight portion in the axial direction is equal to or greater than the longest distance D1 in the radial direction from the outer peripheral end of the rotor core to the magnet insertion hole. rotor described in . 5. Any one of Claims 1 to 4 , wherein the outer peripheral end of the second balance weight portion is located at the same position as the outer peripheral end of the rotor core in the radial direction, or is located inside the outer peripheral end of the rotor core. rotor described in . The rotor according to any one of claims 1 to 5 , further comprising a cup-shaped member made of a non-magnetic material that surrounds the balance weight from the rotor core side and the radially outer side. 7. A rotor according to any one of claims 1 to 6 , wherein the rotor core, the end plates and the balance weights are fixed together by rivets passing axially therethrough. The rotor according to any one of claims 1 to 7 , wherein the balance weights are provided on both sides of the rotor core in the axial direction. a rotor according to any one of claims 1 to 8 ;
and a stator surrounding the rotor. The electric motor according to claim 9 ;
a compression mechanism driven by the electric motor;
A rotating shaft fixed to the shaft hole and connected to the compression mechanism. A refrigeration cycle apparatus comprising the compressor according to claim 10 , a condenser, a decompression device, and an evaporator.