As it says at maximum efficiency I will get 69.5 g cm with a rpm of 18960. What I wish is 1000 rpm with a torque of 900 g cm. I know that this motor might not be enough as it can only give me around 1450 rpm at 1500g cm. But my question is, do I need a gear to create that torque? Or will the motor just work as it is if I put on the weight. I have seen gears made for motors to create higher torque, but I don't understand why? The motor is capable of running by itself then why a gear to increase torque?
Gears are the mechanical equivalent of transformers for (AC) electricity:
Gearing can step-up the speed, at reduced torque; or step-down the speed at increased torque.
That motor is designed to run at high speed ~20000rpm; so 880rpm is virtually stalled - that's the mechanical equivalent of short-circuiting a power supply!
You need to find a motor (or motor+gearbox assembly) that's designed to give the torque you require at the speed you require.
Motor+gearbox assemblies are widely available - aka "gearmotors":
if you want to achieve a torque of 1500 g cm at 1000 RPM, which is beyond the capabilities of the motor itself, using a gear system can be beneficial. The gear system can provide mechanical advantage by reducing the motor's speed while increasing the torque output. This allows the motor to operate within its torque limits while still achieving the desired output torque.
The gear reduction ratio determines the relationship between the motor's speed and the output speed. By selecting an appropriate gear reduction ratio, you can tailor the system to meet your desired torque and speed requirements. The specific gear ratio needed would depend on the motor's specifications and the torque/speed requirements of your application.
Using gears to increase torque is a common practice in many applications where higher torque is needed than what the motor can provide directly. It allows for better utilization of the motor's capabilities while achieving the desired output performance.
It's important to consider the efficiency, backlash, and other factors when selecting and implementing a gear system. Consulting the motor's datasheet and seeking guidance from experts or online resources specific to your motor and application can provide more detailed information and help you make an informed decision.
Remember to also take into account any physical constraints, power requirements, and safety considerations when designing your system.
With that motor, you have no choice but to use a gearbox - the motor alone has no chance of meeting your requirements.
But why did you choose that motor - as it's so clearly unsuitable for your requirement!
Even with a gearbox, there's limits to what can be achieved before size/complexity/efficiency become an issue - far better to just choose something which meets your requirements as-is.
Thanks for the information, I was thinking of 3D printing gears along with the entire chasis of my car as gearbox seems to be my only choice with that motor, will plastic work fine?
Well actually in my area the motors which do suit my requirements are either not available or the import prices are too high. The shop I went to buy this motor didn't even know the name of the motor, I measured the dimensions and matched with the most fitting description of datasheets available online. I understand that it isn't a great choice but keeping the financial side in mind and the small dimensions I needed (around 30 mm) I had no other option.
Getting accurate gears will need some pretty fine printing - especially if you want them small!
Also, you need a material with low friction and high wear-resistance - I would rather doubt that standard filament is going to be great.
Unfortunately, getting high-powered motors in small sizes is not easy; ie, not cheap.
That's just physics
Or a third option is to find something that has the motor/gears that you need and take the motor from it. Almost everything you find used has something in it that can be used for something else. The downside is you will be like me and have a box of small motors.
