AC Induction Motor Operating Temperature

Another good one SolarEagle. Shmoi, if that is the item, then seeing rating S1 being "continuous", that's your answer, as long as you stay under 30W. Also watch out for supply voltage not to exceed!

Well, Panasonic has a distributor in Malaysia, and their telephone number is published just so that enquiries of this type can be answered. The technical helpline might even be able to advise on the type of thermal protection needed to ensure that <...insulation burn...> does not happen.

It's well worth a phone call.

We had call up the local distributor, as the product was not originally bought from them, they reluctant to provide support, and they did not mention about the thermal class of the product, not sure if the knew or choose not to tell!

Nothing in that statement prevents a call to where the motor was purchased. Come on!

<...30W...> is about as much power as the fan motor installed in a fan oven. Hardly worth worrying about.

Motor winding insulation max temperature ratings carry NEMA designations. These ratings are defined as:

NEMA specifies allowable temperature rises for motors at operating under full load (and at service factor, if applicable). The allowable temperature rises are based upon a reference ambient temperature (40°C) and are determined by a "resistance method", once the motor has achieved thermal equilibrium under load, the resistance of the windings is measured. The resistance of the winding is a function of temperature of the winding.

The allowable temperature rises (at full load) for a 1.0 S.F. motor are:

"it will fail because the stator will get to 120 C!"

The 120° C stator temperature does not cause instant motor failure.

These numbers are based on insulation failure due to excessive heat. It is a cumulative failure that may, or may not, happen as the insulation degrades due to thermal breakdown.

Read the document and draw your own conclusions. Or, ask an expert. Maybe SE will enlighten us.

Shmoi

First, good that you state you have never used a motor in continuous running mode before, however you have 'manned up' and said you don't know, so I feel the need to assist.

The answers so far have been good and helpful but to put your mind at ease, you need to know WHY the motor can run for 10 hours without burning.

Providing you do not overload it will run hot and the temp range as shown off the data plate as seen in a previous photo will give you that info, or the manufacturer web site will help.

Second, you need to understand why!

Photo 1

Photo 1 shows how the motor is kept at its working temperature by air (not even cool air) passing over the fins of the stator (see green lines), designed to conduct the internal heat away from the stator windings

Photo 2

Photo 2 shows a motor with the fan cover removed (right hand photo)

Providing the motor is running, the velocity of the air over the body and through the cooling fins of the motor will be more than sufficient to keep the motor at operating temperature. Note I said operating temperature and not cool. Motors produce heat as a by-product of changing electrical energy into mechanical rotary energy, so don't put your hand on the fins, it will burn you!
I hope that's helped your understanding of a motor.

That particular motor is larger than the Original Poster's motor by a factor of 1000 or so to one significant figure. _{Just sayin'.}

Thank you for all the sifu to providing me very useful information, seem like the motor which i am having and the way I use it is within the specification of the motor!

The ambient conditions in which the motor is to be used has been withheld from the forum. If an ambient of <...50...Deg C...> is the norm, then this needs to be taken into account in the selection of the motor, and well before it is operated, <...continuous running mode...> or otherwise.

I found this to be very informative :

Versita

Air flow analysis for electrical cooling system with auto desk simulation CFD 2013 program

acta mechanica et automatica, vol. 7 no. 2 (2013), DOI 10.2478/ama-2013-0016

Faculty of mechanical engineering and computer science, university of Bielsko- Biala, Poland

A, 4 page pdf.