Motor rotor structure, permanent-magnet synchronous motor and variable-frequency compressor
A permanent magnet synchronous motor and motor rotor technology, which is applied in the field of variable frequency compressors, can solve the problems of insufficient back-EMF waveform sine, affecting the performance of permanent magnet synchronous motors, and low efficiency of permanent magnet synchronous motors, so as to improve product competitiveness, The effect of optimizing the magnetic circuit and improving the performance
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[0023] see image 3 The motor rotor structure of the present invention is a built-in permanent magnet structure, and a magnetic isolation hole 21 is provided on the outer side of the magnetic steel slot hole 1 of the rotor 10 .
[0024] The angle θ between the geometric centerline of the magnetic isolation hole and the magnetic pole centerline satisfies the relationship:
[0025] 180° / (np)-2°≤θ≤180° / (np)+2°, where n is the nth harmonic, and p is the pole logarithm.
[0026] In this embodiment, the angle θ between the geometric centerline of the magnetic isolation hole and the magnetic pole centerline is θ=180° / (np)=180° / (5*3)=12°.
[0027] The magnetic isolation holes are arranged symmetrically along the centerline of the magnetic poles. In this embodiment, there are altogether 12 magnetic isolation holes.
[0028] exist image 3 In the first embodiment shown, the magnetic isolation hole 2 is oblong, and the magnetic isolation hole has a certain width H, and the width H of...
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