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 Post subject: Motor Encoder Selection
PostPosted: Tue Nov 30, 2010 9:25 pm 
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Guru

Joined: Sat Oct 23, 2010 5:12 am
Posts: 60
I am currently using a GHM-16 with digital encoders for a first generation rover (Lynxmotion Tri-trac). As I look to future generations of the rover, can anyone steer me to a stronger motor/encoder combination?

General Requirements:
Waterproof (or resistant) to go through puddles
Strong enough to drive rover (5 lbs) and pull long power cable (4 kg-cm stall torque is not enough)

Currently using:
Model Number: GHM-16 (Gearhead Motor)
Voltage = 12vdc
RPM = 200
Reduction = 30:1
Stall Torque = 55.6 oz-in (4 kg-cm)
Outside Diameter = 37mm
Weight = 4.26 oz.

I am open to changing any of the rover components (chassis, motor controller, microcontroller) to acheive more power (torque), utilize encoder, and water resistance.

A web search turned up some manufacturers (ex TTMotor), but any input from the robot community would be greatly appreciated.

Mike


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 Post subject: Re: Motor Encoder Selection
PostPosted: Wed Dec 01, 2010 12:27 pm 
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Master

Joined: Mon Aug 18, 2008 1:26 am
Posts: 799
Location: CA bay Area
Hi. did you post this request for info on the LynxMotion also?
Good luck in your searches.

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 Post subject: Re: Motor Encoder Selection
PostPosted: Wed Dec 01, 2010 5:13 pm 
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Guru

Joined: Sat Oct 23, 2010 5:12 am
Posts: 60
No, I did not, but I will. Thank you.


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 Post subject: Re: Motor Encoder Selection
PostPosted: Wed Dec 01, 2010 7:28 pm 
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Site Admin
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Joined: Thu Mar 01, 2001 7:00 pm
Posts: 1316
Location: Temecula, CA
Jim at Lynxmotion can give you the parts information. They use US Digital quadrature encoders with their motors. You have to have motors with the extended axle out the back of the servo to use those.

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 Post subject: Re: Motor Encoder Selection
PostPosted: Mon Dec 20, 2010 11:14 pm 
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Guru

Joined: Sat Oct 23, 2010 5:12 am
Posts: 60
Thank you.

I already had the GHM-16 with extended axle and quadrature decoder. The combination works great, but I just need more power (torque).

Jim did not know of a combination that would be stronger, but I took the recommendation to contact Maxon motors who provide non-hobby motors. They are more expensive, but after meeting with the Maxon representative while he was in Florida, I think I have identified a gearhead, motor, and encoder that should give me 5 times the torque. I am anxious to process the order so I can take next steps.

I am switching to converting the wireless PS2 config to a wired configuration that will work over 300'. I am going to create a new thread now.

Mike


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