PMSG radial

This is a Permanent Magnet Synchronous Generator. This generator is currently used in the NTNU class TEP4175

Stator (armature)

Number of phases

The radial PMSG generator can have 1 or 3 phases.



1 phase

3 (default):

3 phases

Number of coils in series

The number of coils connected in series in the stator.

  • Default value: 3
  • Unit:
  • Range: 1 — 12

Resistance scheme

Choose how the electrical resistance in the wire is found.


User defined (default):

You set the resistance explicitly.

From diameter:

You set the diameter of the (copper) wire. The resistance is then calculated using the default copper properties.

Copper wire diameter

The diameter of the copper wire.

  • Default value: 0.0015
  • Unit: $\text{m}$
  • Range: 0.0001 — 1

Resistance in wire

The resistance of the wire used in the coils.

  • Default value: 0.0112
  • Unit: ${Ω} \over {\text{m}}$
  • Range: 0 — 100

Number of turns per coil

The number of times the wire is wound for each coil (assumed the same for all coils.)

  • Default value: 36
  • Unit:
  • Range: 1 — 1000

Active length of coil side

For radial flux generator this corresponds to the length of coil that is overlapping with the magnet. Typically this is the length of the magnets, i.e. the length of the rotor.

  • Default value: 0.12
  • Unit: $\text{m}$
  • Range: 0 — 10

Winding factor

Factor that takes into account the fact that the coil width does not cover the pole width perfectly.

  • Default value: 1
  • Unit:
  • Range: 0.1 — 1

Corr. factor for terminal conn.

Correction factor to account for additional total resistance due to terminal connections. Used to calculate total resistance.

  • Default value: 1.14
  • Unit:
  • Range: 1 — 2

Corr. factor for increased temp.

Correction factor to account for additional total resistance due to temperature increase in coils. Used to calculate total resistance.

  • Default value: 1.08
  • Unit:
  • Range: 1 — 2

Length correction factor

Correction of length to account for coil extension in the end-turn region of the coil.

  • Default value: 1.05
  • Unit:
  • Range: 0 — 10

Flux density scheme

Choose how the flux density of the generator is set.


From magnets:

The flux density is caculated from magnet properties (this is only appplicable for an radial flux generator).

User defined (default):

The flux density must be specified by you in the Flux density input field.

Radial geometry

Distance from axle to outer acrylic tube surface

The distance from the center of the axle to the magnet surface on the rotor.

  • Default value: 0.039
  • Unit: $\text{m}$
  • Range: 0 — 100

Coil thickness

Thickness of a coil in radial direction.

  • Default value: 0.015
  • Unit: $\text{m}$
  • Range: 0 — 10

Rotor and flux

Number of poles

The number of magnetic poles in the induction field. This is also the number of magnets.



2 poles

4 (default):

4 poles


6 poles


8 poles

Flux density

The flux density in the middle of the stator coils.

  • Default value: 0.2
  • Unit: $\text{T}$
  • Range: 0 — 1e+09

Load and reference values

Load resistance per phase

This is the load resistance connected to the generator terminals. I.e. it is NOT a part of the generator itself.

  • Default value: 5
  • Unit: $Ω$
  • Range: 1 — 1e+12

Ref. number of turns per coil

Reference number of turns per coil. Used to calculate inductance.

  • Default value: 28
  • Unit:
  • Range: 1 — 1000

Ref. stator inductance per phase

Reference stator inductance per phase. Used to calculate inductance. The unit is Henry.

  • Default value: 0.0016
  • Unit: $\text{H}$
  • Range: 0 — 0.01

Ref. rpm for mechanical losses

Reference RPM for the friction and ventilation loss reference value. The loss is then calculated as proportional with RPM.

  • Default value: 1000
  • Unit: $\text{rpm}$
  • Range: 0 — 1e+06

Ref. mechanical losses

Reference friction and ventilation loss, i.e. extra loss taken into account. The value is the loss at the reference RPM. The loss is calculated as proportional with RPM.

  • Default value: 30
  • Unit: $\text{W}$
  • Range: 0 — 1e+06

Mechanical losses offset

Offset for calculating mechanical losses. This is the value of mechanical losses for zero RPM. Mechanical losses increases linearly with RPM.

  • Default value: 10
  • Unit: $\text{W}$
  • Range: 0 — 1e+06