Explainer video · TEMISA

Synchronous motor and power factor correction

Short answer

An induction motor always takes reactive power to magnetize. A synchronous motor has its own DC-fed field on the rotor and turns exactly with the stator field. Overexcited, it supplies reactive power and corrects power factor; many are built to run at 0.8 leading. If excitation or the rotor winding fails, it loses that advantage and can pull out of step.

Key points

Induction motors always consume reactive power.
A synchronous motor has a DC-fed rotor field.
It turns exactly with the stator field.
Overexcited it supplies reactive power; many run at 0.8 leading.
Excitation or rotor faults can pull it out of step.

Transcript

Why do some motors give your plant reactive power instead of consuming it? It's not magic, it's a synchronous motor. An induction motor always takes reactive power from the grid to magnetize. A synchronous one has its own field on the rotor, fed with direct current, and turns exactly with the field. Like a cyclist who pedals and also pushes the one next to him. Overexcited, it supplies reactive power and corrects power factor; many are built to run at 0.8 leading. But careful, if the excitation or rotor winding fails, it loses that advantage and can pull out of step. So it's not just a motor, it also corrects power factor. Is yours synchronous? Comment SYNCHRONOUS and we'll tell you what to check.

Frequently asked questions

What does 0.8 leading mean?

The motor is designed to supply reactive power at a 0.8 capacitive power factor.

What if excitation fails?

It loses power factor correction and can pull out of step.

Does TEMISA repair synchronous motors?

Yes, including rotor windings and excitation. Email ventas@temisa.mx.

Video with images and narration generated with AI.

See the service: Electric motor repair

Request a quotation by email: ventas@temisa.mx. Phone: +52 33 3614 2460.