JPWO2021199419A5 - - Google Patents

Description

An electric motor according to one aspect of the present disclosure includes:
a stator having a stator core;
a rotor having a plurality of magnet insertion holes and permanent magnets arranged in each of the plurality of magnet insertion holes, and arranged inside the stator;
a first sensor unit facing the end of the rotor in the axial direction, detecting temperature or magnetic flux, and outputting a signal corresponding to the detection result,
one magnet insertion hole corresponds to one magnetic pole of the rotor,
The permanent magnet arranged in one magnet insertion hole forms one magnetic pole of the rotor,
A circle passing through the inner end of the permanent magnet in the radial direction around the rotation axis of the rotor is defined as a first circle, and passing through the outer end of the permanent magnet in the radial direction around the rotation axis of the rotor. When the circle is defined as a second circle, the first sensor section is positioned between the first circle and the second circle on a plane orthogonal to the axial direction.
A compressor according to another aspect of the present disclosure includes:
a closed container;
a compression device disposed within the closed vessel;
and the electric motor that drives the compression device.
An air conditioner according to another aspect of the present disclosure includes
the compressor;
and a heat exchanger.

Claims (18)

a stator having a stator core;
a rotor having a plurality of magnet insertion holes and permanent magnets arranged in each of the plurality of magnet insertion holes, and arranged inside the stator;
a first sensor unit facing the end of the rotor in the axial direction, detecting temperature or magnetic flux, and outputting a signal corresponding to the detection result,
one magnet insertion hole corresponds to one magnetic pole of the rotor,
The permanent magnet arranged in one magnet insertion hole forms one magnetic pole of the rotor,
A circle passing through the inner ends of the permanent magnets in the radial direction around the rotation axis of the rotor is defined as a first circle, and passing through the outer ends of the permanent magnets in the radial direction around the rotation axis of the rotor. When a circle is defined as a second circle, the first sensor section is positioned between the first circle and the second circle on a plane orthogonal to the axial direction. The stator has an insulator provided at an end of the stator core in the axial direction,
The electric motor according to claim 1, wherein the insulator has a connecting portion that holds the first sensor portion. Let VT1 be the voltage [Vrms] corresponding to the amount of the magnetic flux detected by the first sensor unit, T1 be the estimated temperature [°C] of the permanent magnet, and T0 be the predetermined reference temperature [°C]. , where the voltage [Vrms] corresponding to the reference temperature is VT0, and the temperature coefficient [°C/%] of the permanent magnet at the estimated temperature T1 is Br,
The first sensor unit outputs the signal corresponding to the voltage VT1,
3. The electric motor according to claim 1, wherein the voltage VT1 is VT0×[1+{(T1−T0)×Br}/100]. The electric motor according to any one of claims 1 to 3, wherein the first sensor section has a first Hall element that detects magnetic flux. The first sensor unit has a first coil that detects magnetic flux,
The electric motor according to any one of claims 1 to 3, wherein the center axis of the first coil is perpendicular to the radial direction of the rotor in the plane. The electric motor according to any one of claims 1 to 3, wherein the first sensor section has a first magnet and a first thermocouple connected to the first magnet. 7. The electric motor of claim 6, wherein said ends of said rotor are provided with end plates made of aluminum. Further comprising a second sensor unit facing the end of the rotor in the axial direction, detecting temperature or magnetic flux, and outputting a signal corresponding to the detection result,
In the plane, the second sensor unit is positioned between the first circle and the second circle,
The electric motor according to any one of claims 1 to 7, wherein the positions of the first sensor section and the second sensor section are point-symmetrical with respect to the rotation axis of the rotor. (N−1) sensor units (N is an integer equal to or greater than 2) facing the end of the rotor in the axial direction, detecting temperature or magnetic flux, and outputting a signal corresponding to the detection result; further prepared,
The rotor has N magnetic poles,
The electric motor according to any one of claims 1 to 7, wherein the (N-1) sensor units are located between the first circle and the second circle on the plane. 10. The electric motor according to claim 9, wherein each of said (N-1) sensor units has a Hall element for detecting magnetic flux. 10. The electric motor according to claim 9, wherein each of said (N-1) sensor units has a coil for detecting magnetic flux. 10. The electric motor according to claim 9, wherein each of said (N-1) sensor units has a magnet and a thermocouple connected to said magnet. The electric motor according to any one of claims 1 to 12, wherein the end of the rotor is located outside the end of the stator core in the axial direction. The electric motor according to any one of claims 1 to 13, wherein the permanent magnet is a plate-like magnet. 15. The electric motor according to any one of claims 1 to 14, wherein the stator has windings wound around the stator core with concentrated winding. 16. The electric motor according to any one of claims 1 to 15, driven by inverter control. a closed container;
a compression device disposed within the closed vessel;
and the electric motor according to any one of claims 1 to 16 for driving the compression device. a compressor according to claim 17;
An air conditioner comprising a heat exchanger and