Explainer video · TEMISA

Dynamic balancing of electric motors: rotor imbalance and vibration

Short answer

Dynamic balancing of electric motors corrects rotor mass off the shaft axis. At 1,800 revolutions the force grows with the square of speed: double the speed, four times the force. TEMISA mounts the rotor on a bench rated to 15 tons, measures two planes and leaves the residual within ISO 21940. On site the set is laser-aligned and vibration is checked against ISO 20816.

Key points

A little mass off axis, at 1,800 rpm, becomes a force on every turn.
That force grows with the square of the speed: double the speed, four times the force.
The balancing bench is rated up to 15 tons and measures two planes, amount and angle.
Mass is added or removed until the residual is within the ISO 21940 grade.
On site the set is laser-aligned and vibration is checked against ISO 20816. The motor comes back with a balancing report.

Transcript

Your motor vibrates, and every month you're replacing bearings. The problem isn't always the bearing: often it's the rotor. A little mass off its axis is all it takes, and at 1,800 revolutions per minute it becomes a force that hammers the bearings on every turn. That force grows with the square of the speed: double the speed, four times the force. Here's how we fix it at TEMISA. We mount the rotor on the balancing machine, on a bench rated up to 15 tons. Sensors measure, in two planes, how much imbalance there is and at what angle. We add or remove mass exactly where it's needed, and measure again, until the residual imbalance is within the ISO 21940 grade. Then, on site, we laser-align the set and check vibration against ISO 20816. Your motor comes back with its balancing report. At TEMISA we repair, rewind and balance industrial motors. Get a quote at temisa.mx

Frequently asked questions

What does dynamic balancing correct?

Rotor mass that is off the shaft axis. Sensors measure, in two planes, how much imbalance there is and at what angle. Mass is added or removed, and the rotor is measured again.

Why does vibration get worse as speed rises?

The force from imbalance grows with the square of the speed. The video puts it this way: double the speed, four times the force. The example is a rotor at 1,800 rpm.

Which standards does the video cite?

ISO 21940 for residual rotor imbalance on the balancing machine, and ISO 20816 for vibration measured on site after laser alignment.

How large a rotor can the bench take?

A bench rated up to 15 tons. The motor is returned with its balancing report.

If the motor vibrates, does the video say the bearing is the cause?

Not always. The narration says the cause is often the unbalanced rotor. The work it describes is rotor balancing, laser alignment and a vibration check.

Video with images and narration generated with AI.

See the service: Dynamic balancing (Spanish)

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