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ROBOTICS & CNC / DC MOTORS / TT MOTOR ALL-METAL GEARBOX - 1:90 GEAR RATIO
DESCRIPTION
These durable (but affordable!) gearbox motors (also known as 'TT' motors) are an easy, low-
cost way to get your projects moving. This is a TT DC All-Metal Gearbox Motor with a gear
ratio of 1:90 about double of the 'standard' 1:48 ratio. That gives them higher torque but slower
TT Motor All-Metal
Gearbox - 1:90 Gear
Ratio
PRODUCT ID: 3802
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DESCRIPTION
TECHNICAL DETAILS
rotational speed. Since they're slower they're good for robots where strength is more important
than speed.
They look a lot like our yellow all-plastic-gearbox motors but these have all of the motor gears
machined from steel, so they won't strip as easily, and they're twice as slow (and twice as
powerful) given their lower gearbox ratio. The metal gears also mean they're louder when
running.
You can power these motors with 3VDC up to 6VDC, they'll of course go a little faster at the
higher voltages. We grabbed one motor and found these stats when running it from a bench-
top supply
At 3VDC we measured 80mA @ 60 RPM no-load, and 0.5 Amps when stalled
At 4.5VDC we measured 90mA @ 90 RPM no-load, and 0.8 Amps when stalled
At 6VDC we measured 100mA @ 120 RPM no-load, and 1.0 Amps when stalled
Note that these are very basic motors, and have no built-in encoders, speed control or
positional feedback. Voltage goes in, rotation goes out! There will be variation from motor to
motor, so a separate feedback system is required if you need precision movement.
Comes 1 x per order, with just the motor. These motors
do not
come with wires attached, so
you'll need to solder wires on yourself.
You
cannot
drive these directly from a microcontroller, a high-current motor driver is required!
We recommend our DRV8833 motor driver for these motors, as it works well down to 3V and
can be set up with current limiting since the stall current on these can get high. The TB6612 can
also be used, it's on our shields and wings, but you'll need to supply at least 4.5V - which is
what you'll likely want to run these motors at anyhow!
We have a range of wheels, add-ons and accessories for these motors so you can bling out
your bot just the way you like.
TECHNICAL DETAILS
Dimensions (excluding shaft): 69.5 x 22 x 20.7mm
Product Weight: 39.4g / 1.4oz
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