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Question : About DC-motor

B

bamse

Jan 1, 1970
0
I have a chart that shows the correlation between torque and rotational
speed for a DC-motor:

The chart can be viewed here:

http://www.miteget.net/donniebrasco9/gfx/brugerupload/68640PC(2).PDF

The motor is inside an actuator, which is used to control the pitchangle of
a rotor blad on a wind turbine.

For those who do not know what "pitchangle" is, I can inform that pitching
of a wing just means rotation of
a wing around its length-axis.

My question is:

What is the chart used for? What can you deduce from this chart? And what
relevant information can be deduced when the motors purpose is taken into
consideration?
 
W

Wade Hassler

Jan 1, 1970
0
bamse said:
I have a chart that shows the correlation between torque and rotational
speed for a DC-motor:

The chart can be viewed here:

http://www.miteget.net/donniebrasco9/gfx/brugerupload/68640PC(2).PDF

The motor is inside an actuator, which is used to control the pitchangle of
a rotor blad on a wind turbine.

For those who do not know what "pitchangle" is, I can inform that pitching
of a wing just means rotation of
a wing around its length-axis.

My question is:

What is the chart used for? What can you deduce from this chart? And what
relevant information can be deduced when the motors purpose is taken into
consideration?

The values at bottom right are used to design a servo-function that
would use this motor to control some aspect (voltage? power output?
frequency?) of the equipment whose blades are being rotated. The rest
is probably useful, too.
Wade
 
H

HeySteve

Jan 1, 1970
0
This chart shows all the operating parameters of the motor. The driven
load also has a characteristic torque-speed curve. When you have the
load's torque speed curve, you superimpose that on the motor's chart
and where the two intersect gives the operating point of the motor.
You can then read off how much power will be needed to drive the
motor.

Different loads have different types of torque speed curve. For
example for the turbine itself, for each pitch angle there is a torque
speed curve, usually parabolic, that is, the torque is equal to the
square of the speed. For the actuator I would imagine it is just a
straight line with a constant torque value whatever the speed.
 
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