Home » Blog » Questions & Answers » What's difference between Rated torque and Full load torque?

What's difference between Rated torque and Full load torque?

A motor manufacturer assigns a RATING to the motor, which is put on the motor rating plate.( OR IN THE CATALOG)
As the rating plate mentions RATED output and RATED speed, RATED torque is derived from these.
All tolerances as per IEC/NEMA etc are applicable on the rated values ( such as RATED speed) and the actual motor performance will differ from the RATED values on the RATING PLATE (or catalog values).
Hence the actual full load speed when the motor is loaded to the RATED output will be different from the RATED speed on the RATING plate. Hence the actual torque from these values will differ from the rated torque.
Well, no one is perfect, hence tolerances are allowed by all the international standards!

You may also like:

Oversize VFD for smaller motor - 50HP drives 40HP

It has no issues using an oversized VFD. Assuming that's a voltage source drive (most common topology). This design manages the voltage and frequency to attain commanded speed. The current supplied to motor is ...

MV motor starting current problems

In this case sometimes we recorded 775A as starting current and in other times we recorded 400 A for rotor current during start and for stator the current is variable, in some case it was 85 A, and in other ...

Variable speed drive with efficiency motors

Successful rewinding of motors that are driven by variable speed drives does not rest on one large issue but in several small issues, all must be taken care of. I can only hope that the invention of variable ...

A mechatronic variable speed drive may redefine electric motors

A more efficient variable speed drive for motors could help the ubiquitous, energy-sucking devices make another leap in energy efficiency. The problem is that most motors are oversized because of high torque ...

Impedance vs Resistance

In a loop circuit in which the only component is a simple resistor, that resistor is the only thing in the loop that actually "resists" current flow. Apply a DC voltage to a loop without that resistance and ...

VSD blog: A deep observation of automation control industry, especially in AC motor variable speed drive for industrial motor controls.

Hot Tags

Energy saving VFD Motor controls
Variable frequency drive industry
VFD Accessories

Featured

Variable Speed Drive Harmonics

7 months back I was involved in a harmonics evaluation study at Budweiser. This was one of many I've participated in over the past 20 years, basically because in facilities like ...

Variable speed drive energy saving in cement industry

Most of variable speed drives are applying on high temperature fans, kiln head coal mill fans, kiln head surplus fans, raw mill circulating fans and so on. Two production lines ...

Variable speed drive for ID Fans in mining industry

Variable speed drive application in purification system optimizes the system performance, improves purification effect, reduces power consumption greatly. According to related ...

Variable speed drive Power Factor

The motor power factor does not make a big difference other than giving an idea of loading. In regards to the variable speed drive fixing power factor everyone is mostly correct. ...

Soft starter VS variable speed drive

A soft starter is a basic device which will ramp up the speed of your motor to full speed over a preset time, easing mechanical stress and also easing the high inrush currents ...

What's New

Variable Speed Drive Harmonics
Variable speed drive energy saving in cement industry
PLC and DAQ
Is it good to do preventive maintenance for variable speed drives
Does motor starts number affect motor life?
Variable speed drive for ID Fans in mining industry
Regenerative power frequency back to line power
Variable speed drive for axial-flow fans