StrayLoad

Model of stray load losses dependent on current and speed

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).

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 polyphase electrical plug with m pins

plug_n

Type: NegativePlug

Description: Negative polyphase electrical plug with m pins

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 (1)

strayLoadParameters

Type: StrayLoadParameters

Description: Stray load loss parameters

Used in Components (2)

PartialBasicInductionMachine

Modelica.Electrical.Machines.Interfaces

Partial model for induction machine

Machine

Modelica.Magnetic.FundamentalWave.BaseClasses

Base model of machines