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Capasitor start single phase motor

The Structure Of Power System
A steam turbine used to provide electric power

The Structure Of Power System

The first American single-phase ac system was installed in Oregon in 1889. Southern California Edison Company established the first three phase 2.3 kV system in 1893.

An interconnected power system is a complex enterprise that may be subdivided into the following major subsystems:

High voltage transformer 40MVA

• Generation Subsystem
• Transmission and Subtransmission Subsystem
• Distribution Subsystem
• Utilization Subsystem

Generation Subsystem

Generation subsystem includes generators and transformers.


Heavy-Duty Single-Phase Capacitor Start And Run Induction Motor

Three-phase ac generator from around 1895

Three-phase ac generator from around 1895

An essential component of power systems is the three-phase ac generator known as synchronous generator or alternator. Synchronous generators have two synchronously rotating fields: One field is produced by the rotor driven at synchronous speed and excited by dc current. The other field is produced in the stator windings by the three-phase armature currents.

Source: Electrical Engineering Portal

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Um, that was my first posting...

2008-09-09 18:00:49 by -

And I went through exactly that process of selecting caps myself a few years ago.
Go to the GE Capacitor web page, and read up on the differences between "Motor Start" and "Motor Run" capacitors. It's all there in black and white.
Summary: Motor start capacitors are useful for short-term activities like getting a motor started. They are useful when the motor will remove them from the circuit after it's running. Motor run capacitors have high duty cycle ratings and can remain in circuit after the motor is running. You can use a "run" cap in place of a "start" cap, but if you use a "start" cap in place of a run cap, it may overheat and explode.
As with anything you read in a web forum, you are encouraged to go to the source and read the details yourself.

That statement isn't entirely true

2011-05-04 21:37:37 by AZ_Dude

"They have no means of producing or generating voltage unless they are connected to an external source of excitation."
Though I suppose it depends on whether or not you consider an external capacitor as an "external source of excitation."
I know a couple people who have built range extenders for their EVs using squirrel cage induction motors with NO connection to the grid.
They...p being "wild" and will vary all over the place depending on load. However these guys just rectify it to DC so the actual frequency isn't important.
I've read about other people doing the same thing using a converted Induction motor connected to a wind/water mill so they can run the power at high voltage over long lines, then run it through a transformer and rectify it at the battery bank.

Any replacement suitable for AC service that is

2011-05-16 18:37:53 by JerseyScrounger

2 micro farads and has a voltage rating equal to the original or greater will be fine. It cannot be a polarized capacitor with a plus and minus.
Handy trick for testing AC motor start capacitors.
Connect you capacitor to 120/60 through an ac amp meter, and run the results through this formula. (connect it only long enough to get a reading)
MFD = Amps * 2650 / Volts
So for this 2MFD cap at 120/60, it should draw - 0.09 amps, if it's working properly.
When testing this kind of thing I use a test block that I put together that has a 2.5 amp circuit breaker to protect me and the meter, it is also GFI protected.

The capacitors supply some phase shifted power

2010-05-26 19:09:01 by tminus7

To the other phases. They cause leading phase shift to the third leg. This causes a rough three phase supply to the two windings that would just be series connected across the primary single phase. It becomes a bastard form of Scott connection with the capacitor supplying the phase shift. It is not 90 degrees, but better than not. You should use motor run caps, not motor start cap for continuous... "tuning" the cap value to your expected load.

You do have to derated the HP to about 80% of rated. The lack of the phase caps and derating is why three phase motors that get single phased burn up. Running other three phase motors from this arrangement is simply using the running motor as an induction generator.

OK I know a run capacitor on a A/C compressors

2011-08-17 15:50:30 by Sureloxohms

Motor are to the RUN and START terminals.
And the line voltage is wired to COMMON & RUN
And a start capacitors parallel to the run cap
RUN & START as well.
I read thats considered in series with the start winding ,
series being like circus elephants nose to tail to nose to tail.
I dont see that clearly in my head as being in series,
I guess if the run cap was in parallel to the run winding,
it would be wired to common and run as is the line voltage?

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  • Avatar schatzyjr Split phase or Capacitor start motor at variable speeds?
    Apr 30, 2008 by schatzyjr | Posted in Engineering

    Why is a split phase or capacitor start motor typically not a varialbe speed motor? What would have to be done to operate a split phase or capacitor start motor as a variable speed motor?

    • When you run a current through a wire, it will induce a magnetic field. A motor works on the principle that when you place a magnet N to N or S to S, it will repel. By inducing a magnetic field that constantly 'flips', co …ed a Variable Frequency Drive or Variable Speed Drive. It will take an input AC signal, turn it into DC, then use power transistors and computer controls to create a new waveform, whose frequency can be easily controlled.

  • Avatar Explain the operation of single phase capacitor start motor.?
    Apr 16, 2012 by | Posted in Maintenance & Repairs

    Explain the operation of single phase capacitor start motor.

    • Why should I have to explain anything? Wasn't that part of YOUR homework assignment? Do your own work.