No Load of submersible motor

[Manoj]

sir,
I want to keep remain no load current same but want to reduce no load power in the motor. So, please tell us what can I do for this?

 

[petersonra]

It will take a certain amount of power just to turn the motor at a certain speed. It might be that you could reduce the speed it is turning and reduce the power slightly.

 

[Besoeker3]

sir,
I want to keep remain no load current same but want to reduce no load power in the motor. So, please tell us what can I do for this?

Might not be a good idea to run the motor on no load. The chances are that you would cook it.

 

[ptonsparky]

If this is a submersible pump motor it requires a certain amount of liquid to flow past it for cooling. The pump impellers also require a certain speed to ‘float’ and prevent premature wear.

Knowing the type, size and what you are pumping will help in getting a better answer for your needs.

 

[Dzboyce]

And if it is the typical submersible pump motor, it has a Kingsbury type thrust bearing on the bottom of the motor. This bearing has to turn a minimum of 30 hz to maintain the water film to keep from ruining the bearing. If the motor has ball bearings, this doesn't apply.

Also the motor is cooled by the water or fluid flowing past it. There are minimum flow requirements.

Consult the Franklin AIM manual

Franklin AIM | Franklin Water

Franklin AIM

franklinwater.com

 

[xptpcrewx]

sir,
I want to keep remain no load current same but want to reduce no load power in the motor. So, please tell us what can I do for this?

You can’t. The no load current provides reactive power to magnetize the machine, real power to turn the rotor (and account for mechanical losses; i.e. bearing friction, windage), as well as contains copper/core energy losses. You cannot separate these contributions. You can get a higher efficiency motor to reduce losses but the no load current would be less.

 

[Besoeker3]

Maybe Manoj, the original poster, can offer an explanation.

 

[kwired]

You can’t. The no load current provides reactive power to magnetize the machine, real power to turn the rotor (and account for mechanical losses; i.e. bearing friction, windage), as well as contains copper/core energy losses. You cannot separate these contributions. You can get a higher efficiency motor to reduce losses but the no load current would be less.

Reducing frequency (and voltage by same proportion) as mentioned can reduce power yet keep current about same. Also as mentioned it could introduce other problems with the pump and no flow is also a cooling problem in general at any speed