An electrical actuator converting electrical energy into rotational motion.

learn more… | top users | synonyms

0
votes
2answers
39 views

How to start 220/380V 3 phases induction motor by star-delta method with 3 phases 380V power source?

I would like to ask a question about how to start 220/380V 3 phases induction motor by star-delta method with 3phases 380V power source. Practically I think that it is impossible to be able to do it ...
1
vote
3answers
124 views

Rpms required to generate electricity by means of cycling

I'm making a bicycle generator, and am trying to search for the right motor. I need to know at how many rpms a motor would need to be rated to generate a significant amount of electricity (like, to ...
1
vote
1answer
61 views

Can I put an electrolytic motor start capacitor on DC permanently?

Can I use an electrolytic non-polar motor start (to be clear: not a motor run but a motor start, not MKP but electrolytic) capacitor across DC permanently without any damage? If no why ? If yes can I ...
-1
votes
1answer
76 views

Wind a cable using a motor [closed]

I have a very simple question yet I'm unable to find any solution. I've bought a simple DC motor, associated to a gear box that can deliver 16,5N.cm, which is far enough. I'd like to transform the ...
3
votes
2answers
94 views

PIC16F690 not working properly

I am performing some experiments to drive n different inductive loads using the following circuit based on the PIC16F690. The Power Supply part: 12VAC and 24VAC come from the same power ...
0
votes
1answer
47 views

Horsepower power ratings expalined

Basic question guys, I'm looking at replacing a pump motor, and the existing motor is rated for 1.25. My question is simple, is a 1.25 hp rating equivalent to 1/25HP?
0
votes
1answer
67 views

DC Motor with coil inside a rotating magnet. How does it work?

I have seen the following patent online. And I was wandering how that motor works. It seems that the vector of the cross sectional area of the coil is parallel to the vector of the rotation of the ...
2
votes
1answer
112 views

How to use a salvaged brushless motor

I recently took apart an HP LaserJet 1320 laser printer to salvage parts from it. Along with 3 solenoids, a fan, lots of gears, 83 springs, and 71 feet of wire, I got a large brushless DC motor with ...
3
votes
1answer
361 views

Braking a DC Motor

I've been working on a lab for my electrical class, and I can't quite seem to find the answer. I have a DC motor that plugs into a 120V supply,from the supply it is connected to the shunt field, then ...
2
votes
2answers
171 views

Counting number of motor rotations?

I am trying to count the number of times a motor rotates for a fatigue test machine I am building. What type of sensor/electrical component is needed to count the rotations? I plan on having it ...
1
vote
0answers
24 views

Measuring and classify stepper motor

Hi guys I've got a little projet running and need your help: I am going to use a stepper motor and a motor driver, in my mind that should work (maybe with a heat sink for the driver). What do you ...
11
votes
13answers
533 views

Tracking rotation with extremely high accuracy

I would like to track the angular position of a fairly slow motorized rotating arm (direct-drive; see illustration below) -- but require angular accuracy of under 0.05°, and similar resolution. As ...
2
votes
2answers
64 views

Interface for Induction Motor

I'm trying to make a board for controlling a reversible single phase induction motor. The board simply needs to be able to turn on/off the motor and control the direction. My understanding is that ...
2
votes
1answer
65 views

stepper motor constant torque

Is there a way to keep a stepper motor pushing without a given rpm? I have a large stepper motor that I want to assist another motor with as much torque as it can. The other motor is a small 9hp ...
1
vote
0answers
108 views

electric wheelchair

I'm making an electric wheelchair . I want to lift a total weight of 100kg on it with a max speed of 4mph. So help me choose appropriate motors(dc geared , stepper, or .....) and batteries (12 or 24 ...
1
vote
2answers
77 views

Hot swappable stepper motor

We got a bulk of stepper motors, you can see specs on the following image: I'm doing some work on my school laboratory, and they want me to test this motors to see which ones work and which ones ...
1
vote
1answer
127 views

High voltage (70V) amplifier

I need to generate a 400Hz 26V rms signal with at least 200mA drive capability. 26V rms means 72.8V p-p is required. It is to drive the rotor winding on a synchro system. I was planning to use 2 x ...
0
votes
1answer
34 views

2 switching inputs to 3 outputs

I have 2 input pins i1 & i2 they drive a motor forward and reverse by switching states if i1 is 0v then i2 is 24v forward state If i1 is 24v then i2 is 0v reverse state Capable of delivering 3A I ...
1
vote
2answers
80 views

Measuring 400V three phase large consumer power

I need to measure the power consumption of a large (11kW) electrical motor during various stages of operation. I have a few interlinked questions: I'm interested in the power the operator of that ...
0
votes
1answer
86 views

Motor doesn't turn but makes noise [closed]

Motor that I took from electric fan doesn't turn, just makes buzzing noise. I had two fans, took motor from one and when I saw it doesn't work, I opened second one to check if I made something wrong. ...
1
vote
1answer
115 views

Can I drive this chip with a signal to drive the output drives?

This is the datasheet of the chip and I don't speak Chinese. I've tried google translate but with little success. The chip is used in this car. I am trying to use a raspberry pi to drive it over wifi ...
0
votes
1answer
71 views

Supply a DC motor with a SMPS power supply

I want to supply power to a motor from a SMPS power supply. But the problem is SMPS supply have a feedback loop and a fail-back mechanism, so on the startup motor shows a near zero resistance ...
-1
votes
2answers
88 views

MOSFET Overheating when Driving Stepper motor

I'm trying to create a stepper motor driver for a 5 phase motor based on the application note found here. So based on this, I am using the following MOSFETS: These are hooked up to an Arduino and ...
0
votes
4answers
90 views

How much hold current is consumed when there is no load?

Given a 24V 1A motor with no actual load connected (just a piece of orange tape so we can see the shaft moving). How much current will the motor use if I configure the driver board for 2A maximum ...
1
vote
0answers
36 views

Is this motor suitable for my project?

i have a project which have 4 18volt DC motors, each motor rotate a screw which is 8mm and pitch 1.25mm and 200mm length vertically, load connected via nut in screw, every motor has 3.5 KG load and ...
19
votes
2answers
2k views

How does a laser printer control the laser to produce such high resolutions?

I opened up a broken laser printer yesterday to find one of the important sections (this is an example photo from Google Images), trying to learn from the design of the laser+polygon mirror motor ...
1
vote
1answer
53 views

What specifications must I consider for a DC motor?

I'm working on a project where I need a DC motor that is capable of tightening a bolt with a motor. The applications will typically be automotive, therefore, the bolts will need to be tightened to ...
0
votes
1answer
109 views

Using potentiometer to measure distance in linear actuator

I need to use a linear actuator for a project. From what I understand, the position feedback comes from a potentiometer. Here is an example: One more example: ...
3
votes
2answers
116 views

How is this extremely high-resolution stepping achieved?

This question pertains to this video as well as this one by the same person demonstrating his results with a stepper motor (along with a really neat testing method involving a laser spot on a wall a ...
5
votes
3answers
568 views

How these laser show systems work

I am trying to understand how laser show galvanometer systems like this one create high-resolution movement, and generate drawings of reasonable precision (w.r.t. minimum beam angular-deflection step ...
-1
votes
1answer
43 views

Unsure of what this tube is on wired motor [duplicate]

Upon looking for an answer online I found none, maybe it was the way I was describing it I don't know, on to the point though. On VEX robotics motors there is a tube with the wire looped in through ...
0
votes
0answers
60 views

Split analog signal into multiple outputs

Right now I'm working on a project which involves four motors being controlled by an audio input. I know how to do the audio input, but I don't know how to split it at the receiving end. The idea is ...
1
vote
0answers
54 views

What is the differene between zero leading and zero lagging?

The armature reaction of an alternator will be completely magnetising when load power factor is A unity B zero lagging C zero leading D 0.8 lagging Though ...
4
votes
2answers
289 views

Why are the letters U, V and W used in AC motors to represent the windings?

I am connecting up an AC motor and was wondering if this labeling system was representative of something? Or just another set of letter like X,Y,Z? I could not find any information regarding this in ...
0
votes
3answers
111 views

What motor type is better suited for instant torque supply

I am working in a robotics project and I am looking way to make my robot "dash" as soon as possible. Therefore I need to have a quite high acceleration for a brief time. To be more specific, I am ...
0
votes
0answers
47 views

Driving a small DC motor from MCU very slowly

I have a very small DC motor (like the one used in walkmans ages ago). I'm feeding a PWM signal of about 30KHz into the gate of a BS170 MOSFET which is shunted to ground via 15k resistor. The motor is ...
0
votes
1answer
58 views

What will happen in theory if a 240V single-phase AC motor is run on 120V?

The motor is a A.O Smith Century 56-Frame Two-Speed motor. It runs on 240V single-phase. Here's the only reference I found (PDF), search for B2235. If such a motor would be hooked to a 120V circuit, ...
1
vote
1answer
69 views

How to drive such a small motor?

I have a very small stepper 4 pin 2 phase stepper motor, I need to know what's the most convenient way to connect wires to it in order to drive it (as I have about 300 of those I need to drive). ...
1
vote
1answer
67 views

How to filter noise of different frequency based on motor power

I am taking torque readings from strain gauges on an actuator and trying to filter the signal to look usable. I have already put in place a median filter that reduces sporadic spikes. When I have the ...
5
votes
4answers
899 views

How to achieve very accurate/fine rotation with motor

I am running an experiment where I need to rotate a lightweight dial (<5 grams, so very low torque requirement, and fairly slowly), but need to do very accurate, fine steps of 0.03 degrees. ...
0
votes
1answer
58 views

Can a lighting transformer be used to power a pump?

I have a pump that draws 60W at 12V. I had a little old linear hobby power supply I was using to power it in the garden but condensation killed it. Not a surprise but I needed the pump working more ...
0
votes
1answer
266 views

How are induction motors designed to minimize cogging and crawling? [closed]

Why does the induction motor performance phenomena known as "cogging" and "crawling" occur and how can motors can be designed to minimize them?
4
votes
1answer
58 views

How do I determine the curve of the transmission output on a torque-angular velocity graph for a DC motor?

I'm doing a homework problem that involves motor characteristic graphs. For this problem, I have a motor with stall torque of 8 N-cm and a no-load angular velocity of 80 rad/s. The motor powers a ...
0
votes
1answer
122 views

How can brushless DC motor has constant torque?

Have read somewhere, that brushless DC motors have constant torque. How can this be true? Regard motor on the picture: If constant current flows as red arrows indicate, the magnetic field appears ...
0
votes
0answers
23 views

Trying to design a Automatic Return AC Filter Roll System

I get tired of changing my home AC unit air filter out all the time so I was going to try and design a rolled filter material that would automatically spool up/down till it get clean filter material. ...
1
vote
4answers
134 views

What type of motor should be used to handle a static torque (blocked shaft)?

For the purpose of DIY robotics, I would like to have an electric motor, which is best for providing torque while not rotating. I imagine my robot will maintain a static balanced torque while ...
7
votes
2answers
2k views

How can a synchronous motor have RPM other than 3000/3600?

It is said, that synchronous motor is rotating at the same speed as magnetic field rotates. But three-phase made magnetic field rotates as the frequency of current, i.e. 50 or 60 times per second, ...
2
votes
1answer
75 views

Multiple PWM signals from a single audio channel

Here's my project in a nutshell: I'm building a quadcopter and I need to control each of the four motors independently. I'm using an iPhone as the "brain" of the quadcopter, with of all the control ...
0
votes
2answers
83 views

3 phase VFD/rheostat for motor

I have a 3 phase motor and 3 phase power supply (400V, 50Hz) Currently this motor produces 1.5hp in torque and ~1750rpm. I need it to produce less. My question is: Is the best way to go about this, ...
0
votes
3answers
83 views

Can my battery pack provide power for this motor?

I just made a 7.2V 6-cell NiMH battery back with a 2300mAh rating. Will it be enough to power this motor of an RC car? (I will link the datasheet). At maximum efficency it draws 13A at a nominal 7.2V. ...