I am not 100% if this is the right forum so sorry if it isn't.
My application is a vehicle wiper. The existing wiper motor is 24VDC brushed motor and I need to replace this motor with a brushless motor, or a motor that does not create sparks. The existing motor is 0.4Nm 3000rpm , after gears (worm gear 1:75) it goes to about 40rpm and 5Nm.
So I have 24V supply, and need to rotate a wiper, I can use the same gears, so I need a non-sparking motor to deliver 0.4Nm, 3000rpm, or 40rpm at significantly higher torque, my complete guess would be between 1-1.5NM if I was going to hook up the motor directly to the wiper swing arm. Budget approx £90
So far I have looked into AC motors, thinking I can invert the 24V to AC and run an AC motor... however I have been unable to find a suitable AC motor.
I have been trying to find regular BLDC motors, but they don't seem to have enough torque within the price range.
Steppers are where I seem to have found appropriate motors, both to potentially drive the wiper directly, or with the gears. https://www.amazon.co.uk/gp/product/B071CN9VCW/ref=ox_sc_saved_title_1?smid=A2X0W2ER79JKG8&psc=1 The above motor boasts 1.2Nm holding torque, though I am not sure what torque I will get at 40rpm, regardless, I can hook this up to the existing gears and at 3000rpm, I think I'll be able to generate sufficient torque to move the worm gear. The problem I have with this particular motor is that I cannot find a suitable driver for it. This motor is rated at 2.8A/phase, and the A4988 for instance is rated at 2A max. I can find 15A drivers but they are very expensive, well over the budget for the drivers + motor + coupling and bracket I will need to make to attach the motor.
I am really ripping my hair out. Hoping a kind soul will be able to point me in the right direction.
P.S. It is worth noting that I do not need precise movement. I just need rotation at the desired rpm. At this point do not even care if the wiper stops in the middle of the screen when turned off, I can implement "auto park" functionality with hard wiring and limit switch.