Motor kW describes the mechanical output rating
A motor’s rated output is the mechanical power it can deliver at its shaft under its rated conditions. Electrical power entering the motor also supplies its losses. Efficiency relates that input to the useful shaft output; the output rating is not a reading of electricity being drawn throughout a production shift.
Actual loading changes as the granulator idles, receives material and cuts. The same motor rating can therefore accompany different operating energy records. Motor speed also needs its drive context before it is read as cutting-rotor speed.
Read the electrical requirements for the complete machine
A quotation may headline the main cutting motor while separately offering a blower, conveyor or collection equipment. Keep the main drive and proposed auxiliaries in one equipment schedule, identifying any separate supplies. Their electrical data belongs in the supply review, rather than being hidden behind the main motor’s kW figure.
| Record | Question it answers |
|---|---|
| Motor output rating | What mechanical output the identified motor is rated to provide under its stated conditions. |
| Complete electrical requirements | What supply and installation data applies to the quoted machine and its included equipment. |
| Measured energy for a task | How much electricity crossed the stated measurement boundary during the recorded job. |
Have the supplier identify voltage, phase, frequency and the complete configuration’s current, starting and protection requirements in its electrical documentation. A qualified electrical professional needs that information to review the site connection. Adding motor shaft ratings does not supply it; this article is not a method for choosing cables or circuit breakers.
kWh needs actual input power and time
kW measures power; kWh measures energy used over a period. Where the actual average electrical input for a defined period is known, energy equals that average input multiplied by elapsed hours.
For an arithmetic example, an average measured whole-system input of 5 kW over 2 hours gives 10 kWh. Those are illustrative values, not a RHONG specification or trial result. Substituting a motor’s nameplate output for measured average system input would change the meaning of the calculation.
A smaller motor rating alone cannot establish a lower electricity bill. The work completed, loading and time spent running matter. So does equipment outside the main motor’s supply: a separately powered conveying unit can be absent from one meter record and present in another.
Compare the same job across the same boundary
Give both proposals the same material and accepted-output requirement. Record which equipment is included in the energy measurement and whether the job window includes idling, feeding, conveying and collection. Keep the actual task duration with the energy figure.
Energy per accepted kilogram can help compare equivalent tasks, but only when the energy and accepted mass belong to the same record and equipment boundary. For the output-quality and measurement-window questions, use the existing granulator kg/h comparison guide.
Keep the three records together in the quotation
Use the RHONG general-purpose granulator catalogue to identify the proposed model, then keep its motor rating beside the complete electrical requirements and any task-energy record. Each answers a different question. That separation makes missing supply items and unsupported running-cost comparisons easier to spot.
Technical references: U.S. Department of Energy: determining electric motor load and efficiency; ABB: reading a motor nameplate.