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Air conditioning compressors that sit unused for a long time or run low on oil may lock up. The moving parts in the compressor motor will become tight and hard to move.

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Why don't they just use 440 vac capacitors for all condensers and get rid of 370 vac capacitors?

Because when a fan motor (or compressor), is designed to operate on a 370 VAC run capacitor, that will be its optimal efficiency operating design. We're talking about capacitors used on an A/C in a typical 230 volt power supply to a residence or business. If you substitute a 440 VAC run cap in place of the 370 cap, the motor will seem to operate just fine. However, if you put an amprobe on the motor, you will find an increase in the amps it is drawing. This translates to increased heat in the windings, and some motors can handle a small heat rise while others have a problem with it. It partly depends on the airflow over the fan motor along with the quality of the motor, but in any event, you are decreasing the life of the motor along with paying for the electrical current you're wasting, and also, not using the specified cap the motor calls for, in most cases, will void the motor's warranty. The worst place to substitute a 370 VAC cap with a 440 VAC cap is on a compressor. The increased heat load in the windings causes an increase in head pressure and on some compressors already operating at high head pressure and heat load, the compressor can trip off and will stay off until the shell cools down. Of course, the additional amp draw in the compressor will really drive up the power bill. Bottom line, use the cap the motor specs call for. If you have to substitute to get-by because you don't have the right one on your truck, go back the next day and put the right one in. George Henne--Retired A/C Tech----


What makes an electric motor lock up?

One reason an electric motor might lock up is if the bearings seize or freeze (not meaning "freeze" from cold weather but "freeze" as in "lock up" and be unable to function).


If you increase the voltage across the DC motor then motor speed will?

Go up, then stop as it burns out if you push it too far.


What the advantage of armature reaction in electrical engineering?

to speed up the motor.


Causes of over temperature of induction motor?

the main reason is the amount of current flowing in the motor's winding is huge (over current) that why temperature begins to build up, continues using may end up to a burned motor. over voltage, defective bearing / bushing, shaft misalignment, defective insulation are some of the reason why motor experience over current.

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What do you do when your motor locks?

Seek the help of a trusted mechanic to see why it locked up.


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Because the motor running the compressor is generating more heat than the compressor is cooling. Once you close the door the space being cooled is smaller and the compressor can keep up and overcome that heat from the motor.


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In general an air compressor is made up of three parts. They are the air pump, the motor and the tank that holds the compressed air.


The passenger side window will not come up after a weird metal scraping noise it locks but will not roll up can you help me?

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What type of load is a 3 phase compressor motor?

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