Speed control of a compound motor

You should do you own research otherwise your never learn. Because i'm nice ill tell you.

When the series windings is used to weaken the magnetic pole strength as the load increases, this is differentially compounded motor. In these the magnetic flux produced by the series field windings opposes and has the effect of the weakening the magnetic flux set up by the parallel field windings, which then increases. These motors have a tendeency to become unstableas the differential compound effect can cause the speed of the motor to rise to uncontrollable levels. This instability means that this type of machine is seldom used in practice. It is important to know what can result so that motors are not connected in this way.

The speed of cumulative compound motors can be controlled by series or shunt connected variable resistors. In some circumstamces both series and shunt are used.

hope you find this informative, good luck

_______________________________________

Thank you and good night

Researching for yourself is always a good choice. I typed 'Compound Motor' into Internet Explore and had a dozen good sites with information on compound motors and controllers to control the speed within a second.

If you need clarification on somethine you read then please come back and ask questions but be specific in what you ask.

Good luck

im coming with more precise question,

can any one tell me, how we controlling or maintaining the motor speed if the load upon this is twice as it prescribed rating ?

I do not have the answer to that, but I do have a complementing question.

I have a compound motor with three terminals but two of them is winded together so in practice it only two terminals. The motor has four brushes spreaded with 90* angle.

THRIGE-TITAN ELECTRIC A/S Denmark
COMP.MOTOR ---- No. 3222933-87.25
13,2 kW ---- 3200 rpm
S3 15% ---- Class H 25kg
80V ---- 218A
Max 10.000rpm ---- 1CO1 1 POO

Is it possible to control such a motor with an ordinary PWM-controller? I'm planning to user this 13,2kW/80V motor for propulsion of an electric car. But I'm unsure this motor is suitable for such application... Please Help! BR //The comfused Sweed.