Encoder

Started by Anonymous in sci.electronics.basics4 years ago 2 replies

Hi, My stepper motor moves 1.8 degree per Full step. 360/1.8 = 200 full steps per revolution. I will further sub divided full step into 16...

Hi, My stepper motor moves 1.8 degree per Full step. 360/1.8 = 200 full steps per revolution. I will further sub divided full step into 16 micro-steps to get 3200 steps /rev by using software. My question is how to choose encoder for this stepper motor. My goal is very simple , move the motor and read the outputs of the encoder. What should be the "cycles per revolution" and "pulses per ...


60's-vintage motor overload heaters

Started by DaveC in sci.electronics.basics4 years ago 4 replies

http://imgur.com/yIx0dC6 Original on the left, purchased replacement on the right. Questioning whether these are equivalent for an old...

http://imgur.com/yIx0dC6 Original on the left, purchased replacement on the right. Questioning whether these are equivalent for an old General Electric motor starter overload (CR106). Seems like slightly different approaches to get a bimetalic bend effect when a specified current flows through each of these. One requires a resistance wire to heat the metal, whereas the newer one inc...


Power for DC motor controller

Started by Bob Engelhardt in sci.electronics.basics2 years ago 10 replies

I bought one of these 24v DC motor controllers: https://www.ebay.com/itm/311703088756 It came with zero documentation. I found the basic...

I bought one of these 24v DC motor controllers: https://www.ebay.com/itm/311703088756 It came with zero documentation. I found the basic connections on the web, but nothing else. My question here is: it takes 12-24v DC in and with just a variac and bridge rectifier, it works. But would it work better with a regulated supply? I'm guessing not because of its own big cap and PWM output....


inductance of a small C-frame motor?

Started by Anonymous in sci.electronics.basics5 years ago 2 replies

Hello, What is the approximate inductance of a small 110V C-frame motor, in its native laminated core environment? I've got a few C-frame...

Hello, What is the approximate inductance of a small 110V C-frame motor, in its native laminated core environment? I've got a few C-frame motors in my pile of junk, and am wondering if I can just use them as-is in some MC34063 experiments. Thanks, Michael


12 volts to 48 volts for an electric bicycle

Started by Anonymous in sci.electronics.basics7 years ago 33 replies

I got a used 36-volt Crystalyte hub motor and controller from Craigslist. (The guy who sold it to me said they can take 72 volts, but I'm still...

I got a used 36-volt Crystalyte hub motor and controller from Craigslist. (The guy who sold it to me said they can take 72 volts, but I'm still trying to confirm that from their website, which is a bit skimpy. Looks like I'll have to email them.) Motor = 400 X4 (408) http://www.crystalyte.com/ I tried 48V (4x 12v SLA batteries, 8 A-h each), and the bike worked fine for about 3 miles, but ...


Scooting Through Intersections w/o Big Motors & Super Caps

Started by Bret Cahill in sci.electronics.basics8 years ago 10 replies

A 50 kg spring could get a 1,000 kg vehicle up to 15 mph. Instead of using a high HP motor with a lot of rare earth materials driving up the...

A 50 kg spring could get a 1,000 kg vehicle up to 15 mph. Instead of using a high HP motor with a lot of rare earth materials driving up the cost of an electric vehicle it might be better to just use a spring for some of the regenerative braking and use a lower hp motor. This approach would get you through intersections. On the down side getting up to freeway speeds might take longer th...


Split phase motor question

Started by Anonymous in sci.electronics.basics5 years ago 17 replies

I have an old split phase induction motor that runs quite well. Especially considering the fact that it is at least 60 years old. But it makes a...

I have an old split phase induction motor that runs quite well. Especially considering the fact that it is at least 60 years old. But it makes a funny sound when running but the sound disappears immediately whe power is removed. It sounds like something is a little loose. Sorta like if the shaft was oscillating back and forth between the thrust bearings. But it is not that. My son suggested t...


3 Speed Fan motor problem

Started by amdx in sci.electronics.basics5 years ago 16 replies

My wife loves to pick up items other people throw out, because she thinks I can repair them. When she saw me starting to open the fan case she...

My wife loves to pick up items other people throw out, because she thinks I can repair them. When she saw me starting to open the fan case she got close and rubbed on me told me how wonderful it was that I could fix this stuff and how smart I am. Well, I saw right through that! I'm trying to fix it anyway. So, she has a 20 inch 3 speed fan she wants me to fix. The motor just hums but does ...


Class D audio, and motor speed control

Started by Anonymous in sci.electronics.basics6 years ago 4 replies

I found this tutorial on Class D audio circuits: http://www.irf.com/product-info/audio/classdtutorial606.pdf and noticed there is no...

I found this tutorial on Class D audio circuits: http://www.irf.com/product-info/audio/classdtutorial606.pdf and noticed there is no freewheeling diode, as there is in motor control circuits. Why is this? Thanks, Michael


switched reluctance motors

Started by Anonymous in sci.electronics.basics4 years ago 11 replies

Hi, Anyone know where I can find small (100 W or so) switched reluctance motors for sale? (Yes, I used Google, and the best I could come up...

Hi, Anyone know where I can find small (100 W or so) switched reluctance motors for sale? (Yes, I used Google, and the best I could come up with was these guys, who 1. make motors too large for me at the moment, and 2. seem awfully reluctant to give specs or pricing). http://www.nidec.com/en-NA/product/motor/keyword/?q=sr+motor&btnKeyword=mgdb Alternatively, does anyone kn


Moore & Reed Stepper Motor info request.

Started by Bob Kenchington in sci.electronics.basics8 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.


Is this common for a brushless motor controller?

Started by John Doe in sci.electronics.basics4 years ago 23 replies

https://farm1.staticflickr.com/659/21083853371_334b03da77_b.jpg It has five data/signal outputs from the controller to the motor in addition...

https://farm1.staticflickr.com/659/21083853371_334b03da77_b.jpg It has five data/signal outputs from the controller to the motor in addition to three heavy duty power wires. Not sure exactly where the power wires come from since the stuff is encased a glob of glue. One of those signal wires is purple, the other four are black. Is that common? If so, what's it called so I can find some ...


Iris Motor in a Camera

Started by Jim Thompson in sci.electronics.basics6 years ago 8 replies

Any idea where I might find a data sheet for a camera iris motor? In particular I'm trying to find out what kind of signal is output via the...

Any idea where I might find a data sheet for a camera iris motor? In particular I'm trying to find out what kind of signal is output via the feedback winding. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and D...


Torque Vs Speed curve of the Stepper motor

Started by Anonymous in sci.electronics.basics2 years ago 7 replies

Hi, Does torque vs speed curve tell anything about the acceleration and deceleration characteristics of a stepper motor? Farah

Hi, Does torque vs speed curve tell anything about the acceleration and deceleration characteristics of a stepper motor? Farah


Does this chip exsist?

Started by Anonymous in sci.electronics.basics6 years ago 13 replies

I have an old indexer controller that drives a stepper motor directly. The controller is a programmable unit that is made to interface with...

I have an old indexer controller that drives a stepper motor directly. The controller is a programmable unit that is made to interface with a machine tool, for example a CNC mill. The controller is made to drive a stepper motor directly. I do not have the original indexer. Which doesn't matter because I am building a special one for one of my machines. The controller has no provisions for pos...


NTC Inrush Current Limiter to limit DC motor acceleration?

Started by John Doe in sci.electronics.basics8 years ago 1 reply

What would happen if you soldered an NTC Inrush Current Limiter to the positive terminal of your cordless drill DC motor, in series with the...

What would happen if you soldered an NTC Inrush Current Limiter to the positive terminal of your cordless drill DC motor, in series with the lead coming from the pulse width modulator (PWM) trigger speed control? Would that make the drill response laggy? Does the resistance change time vary much? What is that attribute called? Thanks.


connecting a VSD/VFD to an AC compressor

Started by default in sci.electronics.basics3 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...


Permeability in a DC Motor

Started by Anonymous in sci.electronics.basics4 years ago 15 replies

Two motors were evaluated to find the ratio of the speed of the rotor over the speed of the electron in the coil. ratio = speed(rotor) /...

Two motors were evaluated to find the ratio of the speed of the rotor over the speed of the electron in the coil. ratio = speed(rotor) / speed(electron) ratio = 8 meters per second / 10 microns per second Some calculations show that DC electric motors rotate thousands of times faster than the electrons move in the drive current. For example, the Mabuchi RE 280RA motor has a c


HOJO Motor

Started by sparky in sci.electronics.basics8 years ago 15 replies

Has anyone seen one of these actually work ? There are many people who say they work but no one has ever seen a working model without it...

Has anyone seen one of these actually work ? There are many people who say they work but no one has ever seen a working model without it being attached to some remote power source. Is it anything other than the scam it appears to be ?


why are stepper motors so hard to turn?

Started by Anonymous in sci.electronics.basics4 years ago 16 replies

I took apart an old inkjet printer and was surprised the stepper motor has such resistance to it, if it's just an iron gear rotor. What gives?

I took apart an old inkjet printer and was surprised the stepper motor has such resistance to it, if it's just an iron gear rotor. What gives?