We just added two new motors. 8) Well it’s actually the same motor, but one has a built in encoder. These motors are some of the strongest spur gear motors we have ever seen. They are very strong, but amazingly quiet at the same time. Check them out.
GHM-14
lynxmotion.com/Product.aspx? … egoryID=11
GHM-15 (with encoder)
lynxmotion.com/Product.aspx? … egoryID=11
WOOOA! Shiny 8)
Very nice motor! Will any of existing motor mounts fit this motor? Stall torque is really high - will gearbox survive the stall?
I need to complete the redesign of the MMT-02 motor mount. I haven’t been able to get to it. 
The manufacturer states the same stop before reversing thing they all say. It’s a cover the rear warning. I have found the geartrain to be more than capable of running 10 to 20lb bots, full forward, full reverse, slamming back and forth. Maybe heavier, but I have not tested heavier bots.
How well would these work on the Tri-Track? Is it possible to pay the difference when ordering a Tri-Track
to have these 12V motors included instead of the 7.2V ? One last question… when the spec is 12 pulses per
revolution is that total number of rising edges (A channel + B channel) or is that something else? The reason
I ask is because I like the maneuverability and of the Tri-Track, but want a little more speed than the theoretical 2kph.
Will the frame hold up ok? If it will then these shall help me make the Turbo Tri-Track 
Jim the encoder on this is the same as used on the GHM-04 or something different? It looks to be about 15mm long by about 32mm or so in dia, is that right? Thanks.
EB
:mrgreen:
(pppsstt… the drawing linked to the ghm-15 is for the ghm-14) 
The encoder on this motor is 12 CPR vs. the 120 CPR on the external US Digital encoder that fits the GHM-04. I’m not an encoder guru, but I did put a scope on the two quadrature lines and saw nice clean square waves.
I know the image link goes to the non encoder version. We have not had time to create the proper drawing.
Eh, I was looking more for mechanical info atm… but eventually good to know about the 12 vs. 120cpr. I know I can pull dims from the us digital site if the encoder was one of theirs… that is not the case though?
No, it’s added to the motor by the manufacturer.
Jim, can you provide an overall length from the motor face (ie mounting surface) to the end of the encoder for this item?
Given the output shaft speed of 200RPM and a 30:1 ratio I calculate 360 pulses per output revolution or a max of 72K pulses at 200 RPM.
Here are the specs from the website.
Weight = 7 oz (198.45 g)
Reduction = 30:1
Stall Torque = 255.25 oz-in (18.38 kg-cm)
Length (motor, gear and encoder) = 2.94" (7.46 cm)
Length (shaft only) = .83" ( 2.1 cm)
Diameter (motor and gear) = 1.45" (3.70 cm)
Diameter (shaft) = 6mm
Outside Diameter = 37mm
Current (at 12v no load) = 110mA
Current (at 12v locked shaft) = 4.84A
Encoder Type = Hall Effect, Quadrature
Encoder Resolution = 12 ppr
Encoder Power = 5vdc - 24vdc
Encoder Current = 30mA typical
Encoder Frequency = 20kHz
Encoder Connections
Black = GND
Red = Vcc
White = Output A
Green = Output B
Hi Jim,
Do you plan to sell a motor mount, like the discontinued MMT-02, for the GHM-14 so that it can be mounted on a plate chassis?
Regards,
TCIII
200rpm * 30 * 12 = 72K pulses per minute, only about 1.2 KHz which is pretty tame.
I am so sorry it has taken me so long to design the replacement for the MMT-02. It’s on order with a promise date of 9-29-07. Ho! they missed another delivery date. 
They should be here soon.
The new design wil accept any of our 37mm gearhead motors. GHM01-04, GHM12-15, and PGHM01-03. They have a dual flange (top and bottom) to make it even easier to make a good chassis.
Hi Jim,
Thanks for the quick response! Much appreciated.
The new motor mount will fit in perfectly with a new robot design that I have in mind.
I plan on building a half size version of cambot’s third generation robot using a combination of components from Lynxmotion and SuperDroid Robots. It will obviously be bigger than the new 4WD1 Rover so that it can use 12vdc SLBs to be able to run longer.
Regards,
TCIII
Hi Jim,
Any update available on the delivery date of the GHM-14 motor mounts?
I am going to need four of them and four GHM-14 motors for my new Rover.
Regards,
TCIII
Nothing yet, but I expect them any day now. We will post the announcement on the forum, on the what’s new page on the website, and we will probably do a mailer.
Hi Jim,
Still waiting for the new GHM motor mounts from your vendor?
Regards,
TCIII
Nothing yet, not even a reply to my email asking for the status. time for a phone call. :’(
Hi Jim,
Do you have a drawing of the new motor mount that you can post?
I would like to get an idea of its dimensions and the possible motor mounting positions on the mount so I can design ahead.
Regards,
TCIII
