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  #16   Spotlight this post!  
Unread 01-09-2007, 01:05 AM
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Re: 2007 Motor Specs

Quote:
Originally Posted by M. Krass View Post
They're about 2.5 lbs. without the motors. The motors themselves are about another 2.5 lbs. each, as I recall.
Thanks! I am just surprised they didn't give the dimensions and weight of the gearbox.
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Unread 01-10-2007, 01:43 AM
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Re: 2007 Motor Specs

I calculated the theoretical speed/torque/power curve for the RS-540. I would post a graph here, but right now all i have available is open office.org which isn't very good at drawing the graph scales the way i want it to. I can export it to xls or csv or something though.

It may not be exact but should be pretty close.
Code:
Note: Calculated @12V

Speed(rpm)	Torque (mNm)	Power(watts)
0		277.20000	0
100		275.55000	2.89
200		273.90000	5.74
300		272.25000	8.55
400		270.60000	11.33
500		268.95000	14.08
600		267.30000	16.79
700		265.65000	19.47
800		264.00000	22.12
900		262.35000	24.73
1000		260.70000	27.3
1100		259.05000	29.84
1200		257.40000	32.35
1300		255.75000	34.82
1400		254.10000	37.25
1500		252.45000	39.65
1600		250.80000	42.02
1700		249.15000	44.35
1800		247.50000	46.65
1900		245.85000	48.92
2000		244.20000	51.15
2100		242.55000	53.34
2200		240.90000	55.5
2300		239.25000	57.62
2400		237.60000	59.72
2500		235.95000	61.77
2600		234.30000	63.79
2700		232.65000	65.78
2800		231.00000	67.73
2900		229.35000	69.65
3000		227.70000	71.53
3100		226.05000	73.38
3200		224.40000	75.2
3300		222.75000	76.98
3400		221.10000	78.72
3500		219.45000	80.43
3600		217.80000	82.11
3700		216.15000	83.75
3800		214.50000	85.36
3900		212.85000	86.93
4000		211.20000	88.47
4100		209.55000	89.97
4200		207.90000	91.44
4300		206.25000	92.87
4400		204.60000	94.27
4500		202.95000	95.64
4600		201.30000	96.97
4700		199.65000	98.26
4800		198.00000	99.53
4900		196.35000	100.75
5000		194.70000	101.94
5100		193.05000	103.1
5200		191.40000	104.23
5300		189.75000	105.31
5400		188.10000	106.37
5500		186.45000	107.39
5600		184.80000	108.37
5700		183.15000	109.32
5800		181.50000	110.24
5900		179.85000	111.12
6000		178.20000	111.97
6100		176.55000	112.78
6200		174.90000	113.56
6300		173.25000	114.3
6400		171.60000	115.01
6500		169.95000	115.68
6600		168.30000	116.32
6700		166.65000	116.93
6800		165.00000	117.5
6900		163.35000	118.03
7000		161.70000	118.53
7100		160.05000	119
7200		158.40000	119.43
7300		156.75000	119.83
7400		155.10000	120.19
7500		153.45000	120.52
7600		151.80000	120.81
7700		150.15000	121.07
7800		148.50000	121.3
7900		146.85000	121.49
8000		145.20000	121.64
8100		143.55000	121.76
8200		141.90000	121.85
8300		140.25000	121.9
8400		138.60000	121.92
8500		136.95000	121.9
8600		135.30000	121.85
8700		133.65000	121.76
8800		132.00000	121.64
8900		130.35000	121.49
9000		128.70000	121.3
9100		127.05000	121.07
9200		125.40000	120.81
9300		123.75000	120.52
9400		122.10000	120.19
9500		120.45000	119.83
9600		118.80000	119.43
9700		117.15000	119
9800		115.50000	118.53
9900		113.85000	118.03
10000		112.20000	117.5
10100		110.55000	116.93
10200		108.90000	116.32
10300		107.25000	115.68
10400		105.60000	115.01
10500		103.95000	114.3
10600		102.30000	113.56
10700		100.65000	112.78
10800		99.00000	111.97
10900		97.35000	111.12
11000		95.70000	110.24
11100		94.05000	109.32
11200		92.40000	108.37
11300		90.75000	107.39
11400		89.10000	106.37
11500		87.45000	105.31
11600		85.80000	104.23
11700		84.15000	103.1
11800		82.50000	101.94
11900		80.85000	100.75
12000		79.20000	99.53
12100		77.55000	98.26
12200		75.90000	96.97
12300		74.25000	95.64
12400		72.60000	94.27
12500		70.95000	92.87
12600		69.30000	91.44
12700		67.65000	89.97
12800		66.00000	88.47
12900		64.35000	86.93
13000		62.70000	85.36
13100		61.05000	83.75
13200		59.40000	82.11
13300		57.75000	80.43
13400		56.10000	78.72
13500		54.45000	76.98
13600		52.80000	75.2
13700		51.15000	73.38
13800		49.50000	71.53
13900		47.85000	69.65
14000		46.20000	67.73
14100		44.55000	65.78
14200		42.90000	63.79
14300		41.25000	61.77
14400		39.60000	59.72
14500		37.95000	57.62
14600		36.30000	55.5
14700		34.65000	53.34
14800		33.00000	51.15
14900		31.35000	48.92
15000		29.70000	46.65
15100		28.05000	44.35
15200		26.40000	42.02
15300		24.75000	39.65
15400		23.10000	37.25
15500		21.45000	34.82
15600		19.80000	32.35
15700		18.15000	29.84
15800		16.50000	27.3
15900		14.85000	24.73
16000		13.20000	22.12
16100		11.55000	19.47
16200		9.90000		16.79
16300		8.25000		14.08
16400		6.60000		11.33
16500		4.95000		8.55
16600		3.30000		5.74
16700		1.65000		2.89
16800		0.00000		0
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Last edited by Rickertsen2 : 01-10-2007 at 01:53 AM.
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Unread 01-10-2007, 01:46 AM
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Re: 2007 Motor Specs

Where did you get these numbers? You tested the motor?
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Unread 01-10-2007, 02:10 AM
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Re: 2007 Motor Specs

Quote:
Originally Posted by Joel J. View Post
Where did you get these numbers? You tested the motor?
No, they are a purely theoretical APPROXIMATION based on the Kt, Kv and stall current posted on the bane-bots website.

They are based on a model which works pretty well for DC motors in which torque is porportional to current and back emf is porportional to motor rpm. This model does not take into account inductive effects or internal bearing resistance of the motor.

Kt is a constant of porportionality relating motor output torque to electrical current input.
Kv is a constant which relates the rotational speed of the shaft to the voltage generated by the motor.

torque = I*Kt
Induced back emf(voltage created by the motor) = shaft speed * Kv
r= internal resistance of the motor = supply voltage/stall current.

combine these three and you get
torque = Kt*(Vin-Kv*rpm)/r

then for mechanical power in a rotating system we have
power = speed * torque
so
power = rpm*Kt(Vin-Kv*rpm)/r

sorry ,that was a Terrible explanation, but its 3:29 am and i'm tired.
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Last edited by Rickertsen2 : 01-10-2007 at 02:34 AM.
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Unread 01-10-2007, 06:02 PM
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Re: 2007 Motor Specs

Does anyone know if there are any regulations against buying more (12:1) BaneBot CIM Gearboxes? Would it be FIRST Legal to have 4 BaneBot Gearboxes? I can't find the rule to back this up.
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Unread 01-10-2007, 06:09 PM
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Re: 2007 Motor Specs

Quote:
Originally Posted by Arkorobotics View Post
Does anyone know if there are any regulations against buying more (12:1) BaneBot CIM Gearboxes? Would it be FIRST Legal to have 4 BaneBot Gearboxes? I can't find the rule to back this up.
They would be considered under rules governing COTS MECHANISMS and are legal to use.
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Unread 01-10-2007, 07:48 PM
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Re: 2007 Motor Specs

So does anyone know if the Denso window motor is the same as last years window motor? Also, does anyone know where to get the spec sheets for the older style Keyang left/right hand motors? Thanks
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Unread 01-11-2007, 01:17 PM
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Re: 2007 Motor Specs

Hey i need some help, im part of a 1st year rookie team and we need to find out the specs on all the motors. anyone who can help would have our extreme Gratitude!

Andrew
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Unread 01-11-2007, 01:22 PM
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Re: 2007 Motor Specs

Quote:
Originally Posted by Andrewpbhs View Post
Hey i need some help, im part of a 1st year rookie team and we need to find out the specs on all the motors. anyone who can help would have our extreme Gratitude!

Andrew
On the FIRST.ORG site under the Team Documents section there is a link to a Guidlines and Best Practices file. In that file it lists all of the free speeds, stall torques, and max power ratings as well as some other key information for the motors in the kit.
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Unread 01-11-2007, 03:30 PM
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Re: 2007 Motor Specs

thanks abunch!!
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Unread 01-11-2007, 03:33 PM
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Re: 2007 Motor Specs

Quote:
Originally Posted by MattB703 View Post
On the FIRST.ORG site under the Team Documents section there is a link to a Guidlines and Best Practices file. In that file it lists all of the free speeds, stall torques, and max power ratings as well as some other key information for the motors in the kit.
www.usfirst.org actually
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Unread 01-12-2007, 03:37 PM
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Re: 2007 Motor Specs

Does anyone happen to know specs on the pinion gear attached to the Keyang motor? Based on the outside diameter, I was able to figure out that it appears to be a 12 DP gear. If someone could verify this for me that would be great. But now that leaves the question of what pressure angle the gear is... does anyone know?

Also, as far as I can tell, this is very similar, if not equal to the Keyang model PWM-60B.
http://www.keyang.co.kr/english/prod..._code=E0201004

The torque curve data also matches up with what FIRST has published.

So pretty much, does anyone know the pressure angle of this pinion gear? If we knew then everyone could use it without the included plastic coupler and without making a custom coupler. Thanks.
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Unread 01-12-2007, 10:57 PM
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Re: 2007 Motor Specs

does anyone know where where I can get drawings/CAD/specs of the planetary gearboxes of the RS-540 motor? bane doesnt have it, neither does firstcadlibrary...it doesnt matter what ratio
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Unread 01-12-2007, 10:59 PM
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Re: 2007 Motor Specs

Quote:
Originally Posted by sojouner06 View Post
does anyone know where where I can get drawings/CAD/specs of the planetary gearboxes of the RS-540 motor? bane doesnt have it, neither does firstcadlibrary...it doesnt matter what ratio
More Specifically, we need the dimensions of the placement of the #10-32 holes on the face of the planetaries. We have measured with calipers, but our values are kind of fuzzy and don't make sense to me. I'd like an official drawing or cad if there is one. I'll email baneots tonight I guess.
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Unread 01-13-2007, 10:41 AM
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Re: 2007 Motor Specs

i found a really good old thread...it has the specs from last year which are most of the motors from this years comp.

its www.chiefdelphi.com/media/papers/1895

i also looked through more and found some from this year for mabuchi and for the newer fisher price

its www.chiefdelphi.com/media/papers/1384

if anyone has anything else, id love to have it!!

thanks!
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