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Field pulse magnetization of power PMSM rotors

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Abstract

This paper proposes a power pulse magnetizing system (magnetizer) dedicated to magnetize, at once, the entire rotor with surface-mounted rare-earth permanent magnets (PMs) of a high-speed, medium-power, permanent magnet synchronous machine (PMSM). The main component of the realized power magnetizer consists of a cylindrical iron core coil (magnetizer inductor), similar to a two-salient-poles-stator type of dc electrical machine, with an inner diameter corresponding to the internal diameter of the PMSM stator. A power pulse supply provides a field pulse into the magnetizing inductor.

It has to be noticed that the involved circuits are difficult to control due to the high voltage, high current, and, finally, due to all of the energy released over a very short period of time (shock) on the magnetizing inductor only.

This work also presents the results obtained from the analytical calculation of such a specialized magnetizing inductor from a transient finite element method (FEM) analysis of the magnetization process (the magnetizing inductor being connected by the electric circuit of the magnetizer). Finally, a comparison with the experimental results is presented.

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Abbreviations

a :

Number of parallel paths/conductors of the armature

A, B:

Constants

A :

Cross section area (m2)

b :

Width (m)

B :

Magnetic flux density (T)

dc:

Direct current

C :

Capacity(F)

d r :

Outer rotor diameter (m)

h :

Height (m)

H :

Magnetic field intensity (A/m)

i c :

Coil current (A)

J :

Magnetic polarization (T)

k Q :

Slot space factor

l e :

Conductor length of winding overhangs (m)

l Fe :

Iron length (m)

L :

Length (m)

L c :

Coil inductivity (H)

M :

Magnetization (A/m)

N M :

Number of magnets per pole

N P :

Number of turns per pole

p :

Number of pole pairs

R c :

Resistance (ohms)

t :

Time (s)

V 0 :

Capacitor loading voltage (V)

W el :

Electric energy (J)

W m :

Magnetic energy (J)

δ:

Air-gap length (m)

σCu:

Electric conductivity of copper (S/m)

λ:

Magnetic permeance

μ0:

Permeability of vacuum (H/m)

μrec:

Recoil permeability

ω:

Angular electric frequency (1/s)

c:

Coercive/coil

ch:

Choke

Cu:

Copper

el:

Electric

Fe:

Iron

m:

Magnetic

M:

Magnet

p:

Pole

Q:

Slot

r:

Remnant/residual/rotor

s:

Stator

S:

Saturation

y:

Yoke

σ:

Stray (inductivity)

Author information

Authors and Affiliations

  1. Mechatronics Research Group, Korea Electrotechnology Research Institute, P.O. Box 20, 641–120, Changwon, Kyungnam, Korea

    D. H. Kang, P. Curiac, Y. H. Jeong & S. J. Jung

Authors
  1. D. H. Kang
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  2. P. Curiac
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  3. Y. H. Jeong
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  4. S. J. Jung
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Corresponding author

Correspondence to P. Curiac.

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Kang, D.H., Curiac, P., Jeong, Y.H. et al. Field pulse magnetization of power PMSM rotors. Electr Eng 87, 295–304 (2005). https://doi.org/10.1007/s00202-004-0251-5

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  • DOI: https://doi.org/10.1007/s00202-004-0251-5

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