Hi,
I am working on a tennis ball machine, but I'm uncertain of which motors I should buy.
The dual motors for launching the ball candidates are: 775 DC Motor DC 12V-36V 3500--9000
They seem to have similar specs to other motors people seem to be using, but they are way cheaper.
The other one I found is way more expensive. Two of them including shipping are about 60e. Spindle ER11 300W CNC Spindle Motor 52mm Router Bit Tools 0.3KW 220V...
You better ask at a forum that specialises in tennis ball machines. Just some general ideas: figure out the torque you need to accelerate and launch your ball at the speed you want it to go. Get a motor that can deliver a good bit more than that torque.
You probably do not need an H-bridge for that motor, unless you want to run it in both directions, which to me sounds odd for a ball thrower. Also it matters whether you have an AC or DC motor.
Also you're comparing a 0.16A mini motor motor with a 300W one... no wonder the first is much cheaper! And that second link - the 220V motor - it's working voltage is given as 0-48V in the description??
wvmarle:
You better ask at a forum that specialises in tennis ball machines. Just some general ideas: figure out the torque you need to accelerate and launch your ball at the speed you want it to go. Get a motor that can deliver a good bit more than that torque.
You probably do not need an H-bridge for that motor, unless you want to run it in both directions, which to me sounds odd for a ball thrower. Also it matters whether you have an AC or DC motor.
Also you're comparing a 0.16A mini motor motor with a 300W one... no wonder the first is much cheaper! And that second link - the 220V motor - it's working voltage is given as 0-48V in the description??
The chinese specs are a bit shady. More reliable sources state that under load, the cheaper motor should draw 3A to 4A. Both are DC motors. I'm not sure why the second one has 220V in the title, but its a 48V motor. I did want the motors to be able to turn in both directions in order to achieve something, but I will probably scratch that.
This is the motor that I've seen someone on YT use for a tennis ball machine:
It seemed like it performed admirably.
Most places that sell that one wont ship to my country, and one that does charges 30e for the shipping which is absurd.