BioDieselDub
New Member
Hello everyone,
I am new to this group, and this is my first post. I searched through past threads to try and find an answer to my problem, but came up dry. It seems that the more digging I do online, the more confused I get. I am not an engineer, but I am 4+ years into prototype testing a machine I have invented. My current prototype is powered by a Rex Engineering 50 in-lbs Single-Phase Subfractional-hp AC Gearmotor running at 1RPM, purchased from McMaster Carr **broken link removed** for $44.55. So far this motor has run for a couple years, almost non-stop, without any problems. The motor speed is further reduced through a 60:1 worm gear to produce a final speed of 1RPH. I'm not sure if this motor is complete overkill for this application, but it barely strains at all even when the machine is under full load, so I figure I guessed the right torque. My new prototype needs to be adjustable speed from 1RPH to 30RPH without losing the required torque. The input voltage is regular house current of 110VAC. My questions/concerns are as follows;
I don't think I am forgeting anything. This is a good start at least. I hope someone can point me in the right direction.
Thank you in advance for your time.
d
I am new to this group, and this is my first post. I searched through past threads to try and find an answer to my problem, but came up dry. It seems that the more digging I do online, the more confused I get. I am not an engineer, but I am 4+ years into prototype testing a machine I have invented. My current prototype is powered by a Rex Engineering 50 in-lbs Single-Phase Subfractional-hp AC Gearmotor running at 1RPM, purchased from McMaster Carr **broken link removed** for $44.55. So far this motor has run for a couple years, almost non-stop, without any problems. The motor speed is further reduced through a 60:1 worm gear to produce a final speed of 1RPH. I'm not sure if this motor is complete overkill for this application, but it barely strains at all even when the machine is under full load, so I figure I guessed the right torque. My new prototype needs to be adjustable speed from 1RPH to 30RPH without losing the required torque. The input voltage is regular house current of 110VAC. My questions/concerns are as follows;
- Do I need a DC motor or can I get away with AC somehow? Cost is a factor, as I hope to build these machines for retail sale one day. I don't think I can get enough torque through this speed range using an AC motor.
- Assuming I need a DC motor, what type do I need considering that this machine will run almost continuously? I want to go with a maintenance free motor that will last a long time, without costing a fortune.
- Do I need PWM for speed control or can I just adjust the voltage?
- How much noise will be produced from the motor and/or speed control? I need to keep the noise level at a minimum.
- I am considering using automotive wiper motors for this application, but I don't know enough about them yet. They seem to be able to put out a tremendous abount of torque at about 40RPM. I do not know if they can be slowed down to the speed range I am looking for without losing all the torque, or if they will last long enough when used continuously (just had to replace one in the wife's 2004 GMC Envoy today as a matter of fact). I do like the fact that they are easily attainable (assuming I pick one from a popular car), and relatively cheap.
- Any parts that I incorporate into this machine need to be available in large quantities, assuming that I will be in production one day (soon I hope). They also need to be available in Canada. McMaster will no longer ship to Canada, but Grainger has a location close by.
- I would prefer do deal with Canadian companies where ever possible, American second, and Chinese at the bottom of the list. I strongly believe in supporting domestic companies, even if they are not the cheapest.
- Grainger carries some Dart DC speed controls in the $50-$120 range. Not sure if I can get any of these to do the job. The price is right, but the max amps seem pretty low.
Thank you in advance for your time.
d