Speed of a Cumulative Compound DC Motor


by mobin.abrar
Tags: compound, cumulative, dc motor, electric machines, torque-speed
mobin.abrar
mobin.abrar is offline
#1
May6-12, 04:44 AM
P: 1
I came across an equation for the Speed ω in Radians/seconds of a Cumulative Compound DC motor.

ω= K(Vt-IA[RA+RF)/([itex]\Phi[/itex]P+[itex]\Phi[/itex]S)
  • How would we calculate K in this equation?
  • Shouldn't the Terminal Voltage Vt be replaced by Armature Voltage Ea?
  • I came across a lot of varying torque speed curves. WIll the curve be exponentially decaying or linear?
Phys.Org News Partner Physics news on Phys.org
Physicists design quantum switches which can be activated by single photons
'Dressed' laser aimed at clouds may be key to inducing rain, lightning
Higher-order nonlinear optical processes observed using the SACLA X-ray free-electron laser
mfb
mfb is online now
#2
May6-12, 09:16 AM
Mentor
P: 10,830
Maybe you should explain your formula and the used variables, or at least give its source.
My guess: K is some constant given by the geometry of the motor.

I came across a lot of varying torque speed curves. WIll the curve be exponentially decaying or linear?
I don't think that any of these curves are perfectly exponentially or linear. In addition, it might depend on the motor (e.g. how its internal friction depends on the angular velocity).


Register to reply

Related Discussions
Rotating speed of a motor Electrical Engineering 4
dc motor speed and torque Electrical Engineering 7
Question about light speed (is velocity cumulative?) Special & General Relativity 9
Help with dc motor speed Electrical Engineering 7
Motor speed is proportional to......? Electrical Engineering 0