# Calculating current requirements for this motor

Discussion in 'General Electronics Chat' started by vijaybala85, Jul 14, 2010.

1. ### vijaybala85 Thread Starter Member

Jan 7, 2010
92
0
Hi everyone,

This is the information I have regarding a single phase motor that will run at 120VAC. I would like to know how to calculate the current the motor would source from the supply. I have limited experience dealing with motors but this is interesting to know nonetheless.
Here are the details

1 off assembly part number: P1-008-XXX-XXX-XXX-C03
P1 axial piston water pump @ 0.8l/min
0.37kw, single phase, 4 pole, 71 frame, foot/flange mount in permanent cap style electric motor
Bell housing
Coupling
Relief, check and unload C03 valve assembly

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This statement was sent to me as well..

It is 120 volt of course and would have a current draw similar to a ½ hp capacitor motor that we would source locally.
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How to know what value it sources from supply? Please let me know. I am trying to control this motor from a Data acquisition card that would control a relay which switches on/off the motor. Any help would be greatly appreciated. Calculations, circuit setup, diagrams, explanation... etc.. Thanks!

V

2. ### GetDeviceInfo AAC Fanatic!

Jun 7, 2009
1,614
238
CEC lists a 1/2 hp - 120v motor as 9.8 FLA

3. ### vijaybala85 Thread Starter Member

Jan 7, 2010
92
0
Also, can you point out the difference between a solid state relay/switch and a mechanical relay?
THnks!

V

4. ### hspalm Senior Member

Feb 17, 2010
201
9
Why cant he just divide the 370 watts and the 120 voltage to get amps while running at full throttle? Is this because of the stall-current when starting the motor will exceed this 3 amps?

A solid state relay is like a mechanical relay in its usage. The load and the control signal is optically isolated from the latching circuit by a diode and a phototransistor, which in turn "latches" a thyristor or power transistor for the load. This means you have no moving mechanical parts.