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


    ___________________________________________________
    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.
    _____________________________________________________


    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

    Senior Member

    Jun 7, 2009
    1,571
    230
    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

    Active Member

    Feb 17, 2010
    201
    8
    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.
     
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