Permanent magnet synchronous motor and hermetic compressor

• Main Authors: YABE, KOJI, MASUMOTO, KOJI, TAKITA, YOSHIO, YOSHINO, HAYATO, ISHIGAKI, TAKASHI
• Format: Patent
• Language: English; French; German
• Published: 08.06.2016
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

It is an objective to provide a permanent magnet synchronous motor that is highly efficient with low vibration and low noise. A stator 30 includes a stator core 1 that includes magnetic pole teeth 2 each formed between adjacent slots 3, and stator windings 4 that are provided in the slots 3 of the stator core 1. A rotor 40 includes a rotor core 5, a plurality of magnet retaining holes 8, permanent magnets 7 inserted in the magnet retaining holes 8, and a plurality of slits 6 in the rotor core 5 on an outer circumferential side of the magnet retaining holes 8. Among the slits 6, slits 6 in a vicinity of a magnetic pole center of the rotor core 1 are oriented in a direction where a magnetic flux generated by a permanent magnet 7 converges outside the rotor core 1, whereas slits 6 in a vicinity of a pole border portion of the rotor core 5 are oriented in another direction that is different from the direction of the plurality of slits 6 in the vicinity of the magnetic pole center of the rotor core 5.