Motor rotor, motor, compressor and fabrication method of motor rotor

Abstract

The invention discloses a motor rotor. The motor rotor comprises a rotor iron core with a magnet groove, a magnet and a motor shaft, wherein the magnet is arranged in the magnet groove, the motor shaft is matched with an inner hole of the rotor of the rotor iron core, the rotor iron core comprises a first iron core segment and a second iron core segment, the inner diameter of the inner hole of the rotor comprises a first inner diameter arranged in the first iron core segment and a second inner diameter arranged in the second iron core segment, the magnetic groove comprises a first magnet groove arranged in the first iron core segment and a second magnet groove arranged in the second iron core groove, the first inner diameter is greater than the second inner diameter, and the depth of the first magnet groove is smaller than the depth of the second magnet groove. The rotor iron core of the motor rotor is designed in a segmented way according to the inner diameter of the rotor, the magnet groove of each segment adopts different structures, thus, the utilization ratio of the motor iron core can be improved, the magnetic flux effective area of the magnet is expanded, and the energy efficiency of a motor is improved. The invention also relates to the motor, a compressor and a fabrication method of the motor rotor.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a motor rotor. The invention also relates to electric motors and compressors. The invention additionally relates to a method for producing an electric machine rotor. Background technique [0002] figure 1 and figure 2 A structural schematic diagram of a common rotor core and a motor rotor in the prior art is shown. For example, the rotor core 100 includes a rotor inner hole 101 and a magnet slot 102 , and the rotor shaft 110 of the motor is fitted in the rotor inner hole 101 . Especially in the application of the compressor, the rotor shaft (such as the crankshaft of the compressor) may be sleeved with a flange (such as the upper flange of the cylinder) 111. In order to reduce the height of the whole machine, it is often installed on the rotor core A counterbore is provided in the center to accommodate the flange 111. In the prior art, for this type of motor rotor, the dept...

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Problems solved by technology

At the same time, in the small diameter section of the inner hole of the rotor, the physical size between the magnet slot and the inner hole of the rotor is obviously larger than the determined value, which is actually a waste of the utilization rate of the rotor core

[0004] On the other hand, when the rotor shaft diameter of the motor is large, in order to ensure that the minimum physical size between the inner hole of the rotor and the magnet slot is not less than a certain value, the depth of the magnet slot will also be small, and the magnetic flux of the magnet steel will be effective. The area is therefore also smaller and the motor is less energy efficient

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