.EHPTexamples.ElectricDrives.tqFollowing

Information

This system simulates variable-frequency start-up of an asyncronous motor.

Two different sources for the machine are compared.

The motor supply is constituted by a three-phase system of quasi-sinusoidal shapes, created according to the following equations:

WEl=WMecc*PolePairs+DeltaWEl

U=U0+(Un-U0)*WEl/WNom

where:

• U0, Un U, are initial, nominal actual voltage amplitudes
• WMecc, WEl, are machine, mechanical and supply, electrical angular speeds
• PolePairs are the machine pole pairs
• delta WEl is a fixed parameter during the simulation, except when the final speed is reached

When the final speed is reached, the feeding frequency and voltage are kept constant (no flux weaking simulated)