motor wiring / Keeps starting and stopping

Started by Steve Wolf in sci.electronics.basics3 years ago 4 replies

I have motor that was removed from my furnace when a new furnace was installed. I know the motor is good as I replaced it few years. (2 Y...

I have motor that was removed from my furnace when a new furnace was installed. I know the motor is good as I replaced it few years. (2 Y Old). At the time, instead of replacing the motor with a "Furnace" motor for 400 dollars I replaced it with this one for 90 dollars. It worked great until I replaced the furnace. I thought I would now turn it into a grinding wheel. I connect up two wires...


Stepper motor controller help please

Started by Anonymous in sci.electronics.basics10 years ago 7 replies

I recently acquired a programmable stepper motor controller. It was made by Richmill Manufacturing Company Ltd. around 1982. It is designed to...

I recently acquired a programmable stepper motor controller. It was made by Richmill Manufacturing Company Ltd. around 1982. It is designed to drive a unipolar stepper motor. The guy I got it from said it worked fine when he put it away and then upon trying it about a year later it only works intermittently. I did discover one wire in the cable that goes to the motor does not have continui...


DC motor supply

Started by Bob Engelhardt in sci.electronics.basics1 year ago 5 replies

I have a 24v DC motor that I'm using with a PWM controller supplied by a 24v SMPS. I want to be able to briefly switch the motor to 48v with a...

I have a 24v DC motor that I'm using with a PWM controller supplied by a 24v SMPS. I want to be able to briefly switch the motor to 48v with a relay. I don't have a 48v supply, but I do have a 24v transformer & bridge. I know that the following will give me the 48v, and I think that the Motor Control will be OK with it. But I'd like to know if I'm missing something. The relay will d...


Full wave rectified source for DC motor

Started by Bob Engelhardt in sci.electronics.basics2 years ago 6 replies

I need a sanity check - I think I understand, but there's doubt. If I rectify AC with a bridge and use the full-wave output to power a DC...

I need a sanity check - I think I understand, but there's doubt. If I rectify AC with a bridge and use the full-wave output to power a DC motor, it's not the same as using "pure" DC. There is an AC component to the full wave. (The motor is a brushed PM if it matters.) If I take the Fourier series of the 1/2-sinusoid and consider each component separately & then superimpose them, I sh...


PCB Motor: 97% Efficiency and 12 kW/ kg Power

Started by Bret Cahill in sci.electronics.basics2 years ago

Also easy to retool the plant for different size...

Also easy to retool the plant for different size motors. https://insideevs.com/news/453557/infinitum-electric-pcb-motor-first-automotive-application/


Moore & Reed Stepper Motor info request.

Started by Bob Kenchington in sci.electronics.basics11 years ago 1 reply

Hello All. I'm looking for any info on a Moore & Reed stepper motor 23MS112 . I've googled this one but have only come up with similar...

Hello All. I'm looking for any info on a Moore & Reed stepper motor 23MS112 . I've googled this one but have only come up with similar models. It "appears" to be a hybrid 4 phase with a 1.8 step angle. I'm specifically looking for ratings for max current / phase and the nominal voltage rating. Any info would be really appreciated. Regards, Bob Kenchi.


connecting a VSD/VFD to an AC compressor

Started by default in sci.electronics.basics6 years ago 8 replies

I was wondering about using a Variable Speed AC Drive for two air conditioners. One is a window unit, with rotary compressor that uses single...

I was wondering about using a Variable Speed AC Drive for two air conditioners. One is a window unit, with rotary compressor that uses single phase with a capacitor to phase shift and three wires to the motor. Can this be made to run as a three phase motor without the cap? As far as I'm aware "inverter" (hvac-speak for VFD drive) aren't available for window units, in spite of their highe...


Through Board Desoldering High Melting Point Solder

Started by Bret Cahill in sci.electronics.basics2 years ago 6 replies

The power wires for a 500 watt ebike motor go through the board. It there any off the shelf insulator designed to protect the caps and other...

The power wires for a 500 watt ebike motor go through the board. It there any off the shelf insulator designed to protect the caps and other components only 13 mm away? This is asking for a torch. Bret Cahill


DC motor soft start

Started by Bob Engelhardt in sci.electronics.basics1 year ago 6 replies

I found this neat soft-start circuit on the eevblog forum. Its neatness is that the gate threshold voltage occurs immediately and then the RC...

I found this neat soft-start circuit on the eevblog forum. Its neatness is that the gate threshold voltage occurs immediately and then the RC softness kicks in. V+ ________________________ V+ | | 1M ___________ V- |___1u___| | | | |-- |------| |-- | V- ____________| As...


How to slow down RPM of miter saw?

Started by John Doe in sci.electronics.basics8 years ago 48 replies

The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM. What's the easiest way to slow down the RPM? What about simply adding a...

The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM. What's the easiest way to slow down the RPM? What about simply adding a diode in series on the power cord? Any advice, references, and links would be appreciated. Thanks.


Servo motor recommendation sought

Started by D.M. Procida in sci.electronics.basics3 years ago 2 replies

For my plotter project I have experimented with a variety of different servo motors. Very cheap analog micro servos work very well (I have...

For my plotter project I have experimented with a variety of different servo motors. Very cheap analog micro servos work very well (I have been using Tower Pro SG90s), as you can see from the images on the site, but digital versions do not, because they are too twitchy. I'd like to try with some different digital (more expensive) servo motors to see if the


Major Differences In Small Engine Coils

Started by Bret Cahill in sci.electronics.basics11 years ago 7 replies

Maybe the voltages vary somewhat for different point and plug gaps but is it enough to make any difference? . Supposedly Honda no longer...

Maybe the voltages vary somewhat for different point and plug gaps but is it enough to make any difference? . Supposedly Honda no longer makes the coils for their 100 outboard, a 2 cylinder 4 stroke engine. Isn't it likely that other small engines, say from riding lawnmowers, use coils that are pretty much the same? For that matter couldn't a motor vehicle coil work? Bret Cahill ...


Power Routing Switch

Started by Rick C in sci.electronics.basics2 years ago 1 reply

Working on a gadget that uses a 12 volt motor (10 amp peak) and misc electr= onics running on lower voltages. It is powered from an external PSU...

Working on a gadget that uses a 12 volt motor (10 amp peak) and misc electr= onics running on lower voltages. It is powered from an external PSU like a= laptop supply, but 12 volts. There is also a sealed lead acid battery for= backup when the power fails. =20 This design uses pairs of pFETs to route the power from the 12 volts input = when present, or the battery when the line is not p...


Whole house fan motor

Started by telengard in sci.electronics.basics10 years ago 37 replies

Just recently purchased a house and it has a whole house fan. Unfortunately, the folks who installed the A/C disconnected the motorized louvers...

Just recently purchased a house and it has a whole house fan. Unfortunately, the folks who installed the A/C disconnected the motorized louvers to get into the crawl space a couple months ago and I'm not sure exactly how it was wired. In the crawl space there is a black (which had a wire nut on it) and bare wire and a white wire which looks like it was curled up to not use it (it is not stri...


Cycling Safety Transponder, 15m - 45m Range

Started by Bret Cahill in sci.electronics.basics3 years ago 14 replies

The Bike Shield app never caught on because of spotty data in scenic areas. Also some cyclists don't like posting their GPS. A transponder is...

The Bike Shield app never caught on because of spotty data in scenic areas. Also some cyclists don't like posting their GPS. A transponder is the same thing as a bike light except it's at radio frequencies, works around curves day or night, and motor vehicles tune in to the frequency posted on the "Share the Road; Get Cyclist Alerts At AM 1090" sign. It would require a dedicated


Recap On Absolute Cheapest Dummy Load

Started by Bret Cahill in sci.electronics.basics2 weeks ago

Eventually road 15 km against the wind in highest assist. The motor and refurbished battery were both uniformly warm. There were no hot spots...

Eventually road 15 km against the wind in highest assist. The motor and refurbished battery were both uniformly warm. There were no hot spots on the battery in the one minute dummy load test so this is not surprising. Range in medium assist increased from 40 km to 60 km, flat land no wind. Now the bad news. Water filter clogged up and I rummaged around for a fresh charcoal filter. Foun...


mosfet driver needed for logic-level mosfets?

Started by Anonymous in sci.electronics.basics6 years ago 43 replies

Hello, I've discovered logic-level mosfets, and am using an Arduino to drive a small 12VDC (about an amp or so) pump motor with PWM, using an...

Hello, I've discovered logic-level mosfets, and am using an Arduino to drive a small 12VDC (about an amp or so) pump motor with PWM, using an IRLZ34N as the power mosfet. Would a mosfet-driver be recommended to switch that mosfet on and off more quickly? Or is a logic-level mosfet already designed to efficiently turn on and off with the weak logic level signal? Thanks, Michael


how to get this PWM DC motor control to handle more power

Started by causalitist in sci.electronics.basics14 years ago 16 replies

this is the circuit in question, page 3 is the part I'm asking about, not the PWM circuit on page 1,2: http://kitsrus.com/pdf/k166.pdf The...

this is the circuit in question, page 3 is the part I'm asking about, not the PWM circuit on page 1,2: http://kitsrus.com/pdf/k166.pdf The IRF4905 and IRFZ44 limit current to 74A and 49A respectively. The LM324 Quad op-Amp limits Voltage to 32V What is an op-amp that will work here, but be able to handle 100v or maybe 55v min? As far as current and total wattage , I'm looking for min ...


All Ob A Sudden, Starter Motors Is So Small & Light You Can Carry 'em Home In A Filmy Shoppin Bag

Started by Bret Cahill in sci.electronics.basics2 years ago 5 replies

Summin didn't look right. The replacement starter motor was 2/3rds the dia of the original, mebbe haf the wait. I tink, WTF? Weren't all them...

Summin didn't look right. The replacement starter motor was 2/3rds the dia of the original, mebbe haf the wait. I tink, WTF? Weren't all them optimum nummers well settled back in the early Nicolacene? I toght, heck, no need to strap it onto the bike rack. I'll just stick hit into a shoppin bag. Affer an easy installation, the thang _akutually werked._! Affer about 2 days a theory he...