Need DC Motor specs for simulation

[ahmed osama]

how can i get or estimate the following specs for the listed below motor :

1- coil resistance
2- coil inductance (is it DC motor so it is zero) ??
3- zero load RPM
4- load / max torque %
5- effective mass



**broken link removed**



EG-530AD-6B




Model No.: EG-530AD-6B
Rotation: CCW; Rated Speed: 2400 RPM
Rated Voltage: DC 6V
Shalf Size: 8 x 2mm / 0.31" x 0.08"(H*D)
Size(Not include Shaft): 33 x 25mm / 1.30" x 0.98"(D*H)




SKU: 1112004

Voltage Range (VDC): 8.4-15
Current (Amps): 0.132
Rated Speed (RPM): 2400
Torque (g-cm):8
Shaft Diameter: 0.079"
Shaft Length: 0.37"
Size:1.38"D x 0.98"L
DC Motor: Casette, CD Player, CD-ROM, VCD, DVD, DV-ROM

 

[BradtheRad]

Here are my estimated guesses from playing with cassette motors...

1.

A stalled DC motor draws 2 to 4 times its operating current. The supply voltage is going through a coil at a certain resistance.

Normal operating current .132 amps.
Say you apply 12 V and stop the shaft from rotating.
It could draw .4 amps.
Therefore ohmic resistance is 30 ohms.

2.

Coil inductance... It should be low enough that it allows current to build quickly when switched on via the commutator. The aim is to develop ample magnetic field.

If it is too high it delays current through a coil when switched on.

The overall operating impedance is about 90 ohms. ( 12 V / .132 amps )

Since we guesstimated stalled resistance to be 1/3 of this, the inductive reactance will be 60 ohms worth. Offhand I don't know how to derive henry value from this. You draw a parallelogram shape...
Anyway if there are 5 coils inside, then each conducts for 1/200 of a second, with an average of .132 A...

I tried a simulation and I get a few hundred uH.

3.

RPM with no load might be 50 to 100 percent faster than at rated current.

4.

Figure max torque as occurring 1/3 to 1/2 of the way from stalled to zero load RPM.

5.

Effective mass... I imagine this is derived from combining stationary mass and angular momentum.

 

[bubulescu]

Hello,

Please do a search on the Internet for this paper: Parameters Calculation of 5 HP AC Induction Motor. It may provide you with some clues.

Good luck,
Vlad