- #1
SpaceLight
- 11
- 0
Specifically, this is all to do with rotor size of brushless DC motors and how it plays a part in calculating angular velocity / volts / amps / torque.
There is no single equation to be solved here.
Any relating information or equations..., any and all, please jump in.
I've been looking at all kinds of equations -- angular velocity, moment of inertia, torque, angular momentum, so on, and all interrelating factors --, but I'm not 100% on how rotor size effects the results of these equations, in more of a collective manner, so to speak. Radius is a variable in finding linear speed, but for finding angular velocity, radius variable seems to disappear. To some frail extent I realize that DISTANCE is transferred to ANGLE, but it's one big grey area for me.
In motors, one might be inclined to think that a smaller rotor would result in higher speed. Simply enough: The circumference is less, so less time to travel per revolution. You have stator electromagnets interacting with rotor magnets; call it a force pulse, if you will, created between them, and given that pulse of force the rotor proceeds to spin around until the next pulse initiated by commutation. The smaller the rotor, the more rpm; hence, more pulses initiated, more CEMF, so forth, so on, all due to increased speed by the rotor being small.
I've gone a fair distance so far, in physics and in motor design, I understand quite a bit, but I'm intermediate at best, I digress, I can't nail it down when it comes to the relationship between rotor size, force (as stated), angular velocity.
It's very important to what I'm doing; I'll take any input on the matter.
Thank you very extremely much indeed!
There is no single equation to be solved here.
Any relating information or equations..., any and all, please jump in.
I've been looking at all kinds of equations -- angular velocity, moment of inertia, torque, angular momentum, so on, and all interrelating factors --, but I'm not 100% on how rotor size effects the results of these equations, in more of a collective manner, so to speak. Radius is a variable in finding linear speed, but for finding angular velocity, radius variable seems to disappear. To some frail extent I realize that DISTANCE is transferred to ANGLE, but it's one big grey area for me.
In motors, one might be inclined to think that a smaller rotor would result in higher speed. Simply enough: The circumference is less, so less time to travel per revolution. You have stator electromagnets interacting with rotor magnets; call it a force pulse, if you will, created between them, and given that pulse of force the rotor proceeds to spin around until the next pulse initiated by commutation. The smaller the rotor, the more rpm; hence, more pulses initiated, more CEMF, so forth, so on, all due to increased speed by the rotor being small.
I've gone a fair distance so far, in physics and in motor design, I understand quite a bit, but I'm intermediate at best, I digress, I can't nail it down when it comes to the relationship between rotor size, force (as stated), angular velocity.
It's very important to what I'm doing; I'll take any input on the matter.
Thank you very extremely much indeed!
