WOLFRAM SYSTEM MODELER

StrayLoad

Model of stray load losses dependent on current and speed

Wolfram Language

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SystemModel["Modelica.Magnetic.QuasiStatic.FundamentalWave.Losses.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 512, 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: [Lang1984]

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).

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

Connectors (5)

plug_p

Type: PositivePlug

Description: Positive quasi-static polyphase plug

plug_n

Type: NegativePlug

Description: Negative quasi-static polyphase plug

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

Components (3)

v

Type: ComplexVoltage[m]

Description: Complex voltage

i

Type: ComplexCurrent[m]

Description: Complex current

strayLoadParameters

Type: StrayLoadParameters

Description: Stray load loss parameters

Used in Components (1)

Machine

Modelica.Magnetic.QuasiStatic.FundamentalWave.BaseClasses

Base model of machines