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Multiphase machines with individual slot activation

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Abstract

Under the aspect of decreasing costs for power electronic elements due to mass production, machines with feeding from multiphase inverters can be considered where each slot is activated as a separate phase. The number of IGBT switches is increased, but the current rating of the IGBTs becomes very small, thus reaching the region of cheap mass production elements. Additionally, this allows a smaller capacitor in the intermediate circuit and a mechanical structure of the inverter that can be easily integrated into the machine housing. By this, the often critical du/dt problems can be reduced significantly. In the machine, new features such as an ideal sinusoidal or even rectangular distribution of electric loading and flux density become possible. Moreover, if induction machines with squirrel cage are considered, a rather free adjustment of the pole pitch is possible. In the paper, this approach and its consequences on the performance and the construction of the machine are discussed for an exemplary induction machine.

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Abbreviations

z N :

Number of conductors per slot

w sp :

Windings per effective coil

w s :

Effective number of stator windings

m s :

Number of stator phases

a :

Number of parallel stator branches

q :

Slots per pole and phase

ξ s, ξr :

Winding factor of stator, rotor

p, τ p :

Pole pairs, pole pitch

N s, N r :

Number of stator slots, rotor slots

I s, I μ :

Stator current, magnetizing current

I r, I´r :

Rotor current, rotor current transformed to stator side

I z :

Branch current

I St :

Current in the star point

U s :

Stator voltage

U d, U h :

Voltage of intermediate circuit, induced voltage

Ψs, Ψr :

Stator, rotor flux linkage

f s :

Stator frequency

ω s, ω r :

Stator, rotor circular frequency

l Fe, l e :

Magn. iron length, iron lamination length

l ü :

Length of a coil in front and back region

h j :

Yoke height

A L :

Cross section of one conductor

A St :

Cross section of star-point ring

D :

Diameter of stator bore

D st :

Mean diameter of star-point ring

σ Cu :

Conductivity of copper (σCu = 42 Sm/mm2 at 120 °C)

\( \delta^{\prime\prime} \) :

Effective air gap

A s :

Electric loading of stator winding

B h, B 0 :

Air gap flux density at full and at no load

W m :

Magnetic energy in air gap

L sh :

Cyclic inductance

L sσ, L´rσ :

Stator, rotor flux leakage inductance

R s, R´r :

Stator resistance, rotor resistance transformed to stator side

n s :

Speed at pole switching

n max :

Top speed

M :

Torque

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Authors and Affiliations

  1. Technische Universität Braunschweig, Institute for Electrical Machines, Drives and Traction, Hans-Sommer-Str. 66, 38106, Braunschweig, Germany

    W.-R. Canders & H. Mosebach

Authors
  1. W.-R. Canders
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  2. H. Mosebach
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Correspondence to W.-R. Canders.

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Canders, WR., Mosebach, H. Multiphase machines with individual slot activation. Electr Eng 100, 2287–2297 (2018). https://doi.org/10.1007/s00202-018-0703-y

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  • DOI: https://doi.org/10.1007/s00202-018-0703-y

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