- Joined Jul 12, 2017
what is the DC motor RPM formula?
https://www.alibaba.com/product-detail/12v-dc-motor-specifications-FF-130RH_781291487.htmlWhat kind of DC motor? What kind of load? In terms of what variables?
datasheet is on the link.
i just want to know what is the formula of rpm, i want used to prove that this is the formula to find out rpm answer.
Depends on the motor and, more so, on the conditions. What is the load on the motor? Does that load change with speed? Probably. But how?
RPM is related to voltage, that motor is rated for 12vdc then it should rotate at 6100 rpm with 12v applied if it has been rated correctly.
how to find the value of K1 & K2?Hello again,
A simplified static solution would look like:
where k1 and k2 are constants for the motor and R is the equivalent armature resistance, V is the applied voltage and w is the angular speed.
From this simple expression we see that if the torque is zero then we have;
which is completely linear so a 12v motor at no load run with 6v will run at 1/2 the speed.
However, there is always some torque T because of the imperfections in the motor, and these may be significant so we dont see a perfectly linear relationship with most regular motors we use. For example, a PC fan motor speed is not exactly proportional to voltage and this is very evident by the fact that a 12v motor does not run with only 1v applied, whereas if it was perfectly linear it would run at 1/12 the top end speed.
The 12v DC fans i tested start turning at 3v or 4v if i remember right. After that they may be fairly linear where we have pseudo drive voltage v such that: v=V-3 or v=V-4 possibly.
We can look at a better model, but we'll end up with something similar in the static case where we apply a DC voltage and wait for the motor speed to become perfectly constant.
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by Jake Hertz
by Jake Hertz