WOLFRAM SYSTEMMODELER

StrayLoad

Model of stray load losses dependent on current and speed

Wolfram Language

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

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

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.

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.

See also

StrayLoad parameters

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

Connectors (5)

p

Type: PositivePin

Description: Positive pin (potential p.v > n.v for positive voltage drop v)

n

Type: NegativePin

Description: Negative pin

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 (2)

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 (7)

DC_PermanentMagnet

Permanent magnet DC machine

DC_ElectricalExcited

Electrical shunt/separate excited linear DC machine

DC_SeriesExcited

Series excited linear DC machine

DC_PermanentMagnet

Quasistationary permanent magnet DC machine

DC_ElectricalExcited

Quasistationary electrical shunt/separate excited linear DC machine

DC_SeriesExcited

Quasistationary series excited linear DC machine

PartialBasicDCMachine

Partial model for DC machine