WOLFRAM SYSTEMMODELER

StrayLoad

Model of stray load losses dependent on current and speed

Wolfram Language

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SystemModel["Modelica.Electrical.Machines.Losses.InductionMachines.StrayLoad"]
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Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

Stray load losses are modeled similar to standards EN 60034-2 and IEEE 112, i.e., they are dependent on square of current, but without scaling them to zero at no-load current.

For an estimation of dependency on varying angular velocity see:
W. Lang, Über die Bemessung verlustarmer Asynchronmotoren mit Käfigläufer für Pulsumrichterspeisung, Doctoral Thesis, Technical University of Vienna, 1984.

The stray load losses are modeled such way that they do not cause a voltage drop in the electric circuit. Instead, the dissipated losses are considered through an equivalent braking torque at the shaft.

The stray load loss torque is

  tau = PRef/wRef * (i/IRef)^2 * (w/wRef)^power_w

where i is the current of the machine and w is the actual angular velocity. The dependency of the stray load torque on the angular velocity is modeled by the exponent power_w.

See also

StrayLoad parameters

If it is desired to neglect stray load losses, set strayLoadParameters.PRef = 0 (this is the default).

Connectors (5)

plug_p

Type: PositivePlug

Description:

plug_n

Type: NegativePlug

Description:

flange

Type: Flange_a

Description: Shaft end

support

Type: Flange_a

Description: Housing and support

heatPort

Type: HeatPort_a

Description: Optional port to which dissipated losses are transported in form of heat

Parameters (3)

m

Value: 3

Type: Integer

Description: Number of phases

useHeatPort

Value: false

Type: Boolean

Description: =true, if heatPort is enabled

strayLoadParameters

Value:

Type: StrayLoadParameters

Description: Stray load loss parameters

Components (1)

strayLoadParameters

Type: StrayLoadParameters

Description: Stray load loss parameters

Used in Components (12)

AIM_SquirrelCage

Asynchronous induction machine with squirrel cage rotor

AIM_SlipRing

Asynchronous induction machine with slipring rotor

SM_PermanentMagnet

Permanent magnet synchronous induction machine

SM_ElectricalExcited

Electrical excited synchronous induction machine with damper cage

SM_ReluctanceRotor

Synchronous induction machine with reluctance rotor and damper cage

PartialBasicInductionMachine

Partial model for induction machine

AIM_SquirrelCage

Asynchronous induction machine with squirrel cage

AIM_SlipRing

Asynchronous induction machine with slip ring rotor

SM_PermanentMagnet

Permanent magnet synchronous machine with optional damper cage

SM_ElectricalExcited

Electrical excited synchronous machine with optional damper cage

SM_ReluctanceRotor

Reluctance machine with optional damper cage

PartialBasicInductionMachine

Partial model for induction machine