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- Hobby Gearmotor - 200 RPM (Pair)
images are CC BY 2.0
Description: These are a pair of hobby gearmotors from DAGU. These gearmotors are the same ones recommended for use in the Shadow Chassis and offer a cheap and easy-to-use setup to get your wheels turning. Each Hobby Gearmotor also possess a 9mm long output on a straight axis.
These gearmotors require a voltage of 4.5V with a no load current of 190mA while possessing a gearbox ratio of 48:1 and a wheel speed of 140 RPM unloaded.
Every motor order is sold in packs of two.
Note: The RPM listed in the datasheet below is listed as 90RPM. Based on our own testing we found the gearmotors can actually achieve a No Load Speed of about 140 RPM.
Features:
- Suggested Voltage: 4.5VDC
- No Load Speed: 140RPM
- No Load Current: 190mA
- Max. Load Current: 250mA
- Torque: 800 gf-cm
Documents:
- Datasheet (DG01D)
Forgive my lack of technical language, but these look like they have one shaft coming out of the top and two that stick out of the sides. The top one is a long and skinny metal shaft and the other two look like plastic. My question is, do they all three spin?
Yes they all spin. The skinny metal shaft is typically used to add a wheel encoder. The wheel encoder allows you to determine how far you wheel has turned. This metal shaft turns at the same rate as the motor and is not effected by the gears. For this motor for every turn of the wheel (the plastic shaft) the metal shaft will turn 48 times (since its 48:1 gear box).
The other two plastic shafts are to attach a wheel. I only use one of these shafts to attach one wheel. The other plastic shaft goes unused in my robot.
800 gf-cm is 0.078 Nm is 11 oz-in.
What’s the backlash like on these motors? Would it be small enough for a balance bot?
How would i go about mounting this to anything?
These were definitely not designed for ease of use. There are two through holes where the motor mounts to the transmission. I think they are 3mm. There is also a small tab at the center front of the gearbox with a hole. You need to use bolts or sometimes I just use 3/32 pop rivets if I am not planning to remove them. I can speak from experience that the gearboxes are made from some sort of high molecular weight plastic (I’m guessing polypropylene or polyethylene) and no glue will stick to them—I’ve tried pretty much all the choices. VHB tape might work for temporary installation.
Hurrah! Tail shaft! Thank you for enabling encoders. What is the diameter of the tail shaft?
Can these go forwards and backwards?
Yes.
Do they come pre-wired to connect to the RedBot mainboard?
The photo’s don’t show the wires….
You need to solder on the wires
What wheels can be used with these?