An electrical actuator converting electrical energy into rotational motion.

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1answer
45 views

Acceleration time of unloaded motor

I want to use a motor to generate musical tones by spinning a disk. The disk will have optically printed sound waves on it. I would like to know how fast the motor will be able to change speed from ...
1
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1answer
103 views

variable frequency three phase AC

I want to generate 1-150Hz+ three phase AC. Output voltage at maximum frequency would be around 240VAC and current around 40A. I have a few 60Hz three phase induction motors, drive shaft coupler, and ...
3
votes
5answers
288 views

How to avoid damaging relay used for controlling motors?

I've got a circuit with two DPDT relays controlling a motor - the diagram below is borrowed from a related but different question. RLY1 turns everything on and off, RLY2 switches the direction of the ...
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2answers
102 views

Control DC Motor with arduino

Recently I bought this motor and I want to control it with an Arduino. I read that I can drive the motor with a H-Bridge with TIP120 Darlington transistors, but the problem is that voltage in the ...
2
votes
1answer
184 views

What kind of motor to use in a PCB drill?

I'm trying to use this super-cheap PCB drill that I bought recently, but it's too weak for human convenience (takes about 10 seconds to get through standard 1.6mm FR4). The drill uses a small DC ...
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vote
1answer
95 views

driving motor DC 24V with MOSFET

this is the basic shematic, i added a freewheel diode with the connector of the motor . Im driving a DC motor 24DC 1A, im using PWM 500Hz from microcontroller and MOSFET IRF740 with a driver TLP250 ...
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1answer
60 views

how to add switches to the end of the rotation that will cut off a stepper motor so I don’t damage anything at the extremes of the motion? [closed]

I need to work on how to add switches to the end of the rotation that will cut off a stepper motor so I don’t damage anything at the extremes of the motion. I'm using a Dual - H Bridge to control the ...
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0answers
78 views

bernina motor capacitor exploded. How to repair motor [closed]

My girlfriends Bernina sewing machine exploded and catched fire. It made a lot of smoke, probably wasnt very healthy. Now what the bernina store said was to get a replacement motor but that also means ...
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1answer
48 views

Low RPM, Low Power, Low Torque Motor (to be solar powered)

I am trying to build a small contraption/artwork to be mounted on a wall indoors. Ideally it will solely solar powered from a small solar panel (10cmx10cm). It needs to spin slowly anywhere between ~...
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vote
2answers
88 views

Necessary to lubricate old electric motor? [closed]

I'm in the process of digitizing some old audio reels. The reel-to-reel player is very old and it tends to slow down after it's been on for a while. I was thinking that maybe the motor needed to be ...
0
votes
0answers
22 views

drv8833 motor driver with lipo-2s problem

I am using a drv8833 motor driver for brush motor and i have one problem. When i'm connecting its VIN and GND to powerbank battery, brush motor to BOUT12 and BIN12 to atmega 328p, setting BIN1 to '1' ...
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votes
3answers
55 views

How to match a motor to a generator to make ample power [closed]

If we use a high speed motor and reduce its rpm hence gaining more power from it, and then use that to run a generator which generates about double the power being consumed by the motor at that speed ...
1
vote
1answer
100 views

Efficiency comparison between six step and FOC for a given motor

For a given PMSM motor with sinusoidal back-EMF, it can be driven by either six-step (as in drone applications) or by FOC (as in servo control). However, for a given motor and given DC link voltage, ...
0
votes
2answers
134 views

PID and motor control by PWM

I am having a potentiometer which gives an analog voltage in range of 0-5V. I am considering this POT as throttel input for motor. If i change the pot speed increase and decrese on the basis of ...
3
votes
3answers
125 views

why the supply voltage of dc motor decreases when the motor load increases?

When I plot the supply voltage of a one-cell LiPo battery during the working period, I found that the supply voltage would drop dramatically when the motor is commanded to speed up. I think this is ...
0
votes
1answer
76 views

How to double the power supplied to an electric motor?

Need some help here: Assuming I need to power a toy motor with a 3V battery... 1. Is there any way for me to generate more power to the motor, at the cost of duration? (Run faster but for a while only)...
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votes
2answers
70 views

What permanent magnet motor is the best for the bike generator? How to decide about wattage?

I am new here.. I would like to build my bicycle generator with permanent magnet motor similar to this one Bicycle Power Basics Basically, I want to run my pedal cinema with a bike generator. I am ...
0
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1answer
38 views

AC induction motor circuit and stall current

How can I describe the stator current of a 3-phase locked/stalled induction motor by using equivalent circuit of the motor?
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1answer
86 views

Motor speed based on uF of capacitor

I have a single phase duct fan that that run by a capacitor and its running too fast. I don't need it at this speed. Motor: Single Phase Motor 78w @ ...
1
vote
2answers
69 views

Which oscilloscopes can reliably measure losses in an inverter for an AC motor?

For my next project at my workplace I am looking for an oscilloscope which gives me good support in measuring the losses in one of the half-bridge switches over one commutation period. The last time I ...
0
votes
2answers
640 views

3 phase induction motors with poles not equal to 3x

I am having trouble finding diagrams to show induction motors with poles not equal to 3x. Everything I find is 2 poles per phase. Can anyone explain and help me visualize, for example, a 4 pole 3 ...
1
vote
1answer
89 views

PWM or Variable Resistor [closed]

For a school project, I have to design and perform an experiment of my choice. I have chosen to test the efficiency of variable resistors and PWM circuits by testing the amount of energy wasted (heat ...
0
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1answer
71 views

Solar Motor Circuit Design

Trying to build a simple circuit to power a small pump while the sun is out. Here are the specifics: Solar Panel (60 cell mono panel) Open circuit voltage 36.4V DC, Short circuit current 7.96A. Pump ...
0
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1answer
52 views

BLDC Current Driver Encountering Current Problems

The attached Schematic uses 6 N Channel Power Mosfets "IRL3303". I have wound my inrunner bldc motor with 180 windings per phase using a 26 Gauge Magnetic Wire. My motor is a 6 pole 2 magnets machine. ...
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1answer
182 views

Using hard disk motor as generator

I have disassembled 20 broken hard disks and taken out the motors, thinking they might be useful. However, they didn't work using DC current, because they required some kind of control circuit. Now I ...
11
votes
2answers
3k views

Does a DC toy motor emit AC when you spin it?

I just watched a video on Facebook by somebody who built a project to run an LED using a 9 volt DC motor scrounged from a battery operated toy. They simply wired the LED to the motor and then used a ...
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2answers
110 views

The leads of my 3-phase motor are incorrectly labeled. How do I determine the correct labels?

I connected my new-in-box 3-phase motor to my new-in-box VFD, following the instructions in both manuals and the wiring diagram on the name plate (low voltage configuration). With the power off, ...
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votes
1answer
46 views

Experiment to determine the relation between applied voltage and angle of output shaft of a DC Servo motor?

My project need to control the position of a DC Servo motor, but I don't know the plant model of my motor. So, I want to make an experiment to acquire the data between the applied voltage and angle of ...
-3
votes
2answers
90 views

Some question on SERVO MOTOR [closed]

Basically we give a PWM wave to the control input, but what will be the input for the error detector...? How is this PWM wave converted to some voltage value that can be compared from the ...
0
votes
1answer
51 views

Motor not strong enough to move buggy

For my A2 final project, I am making a buggy that can be programmed using an onboard control panel. I have a GENIE E18 PIC Microcontroller to control the ins and outs, with an L293D Motor Driver to ...
0
votes
1answer
28 views

Multiple voltages and currents required in one circuit

I have a circuit with the following components: microcontroller - 7-12V, v.low current 2x Servo - 6V, 250mA Solenoid - 18V, 14 Ohm coil Geared motor - 9V, 6A stall current Power supply - 19V, 3A DC ...
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votes
2answers
95 views

Startup current of an induction motor when using VFD

A 3-phase AC induction motor has the following ratings: rated power: 130kW input power: 140kW rated voltage: 3x400 V rated current: 270A supply freq: 50Hz there is no soft-start The motor ...
0
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1answer
47 views

How does a moving magnetic field cause motion in the Al strip rotor?

Consider the following information: https://www.youtube.com/watch?v=7snjbmdYlDI How would you explain how the moving magnetic field causes motion in AL labeled rotor?
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1answer
69 views

How to wire a 5-leads single phase asynchronous motor to a 3-leads bidirectional controller?

Autistic has kindly identified the legacy motor I would like to recycle as a single phase asynchronous motor (see linked thread). Here is the internal schematic: (source thread) I would like to ...
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vote
1answer
84 views

What is the type of this legacy motor and how is it supposed to be controlled?

A friend of mine is going to give me an old Dayton 8F047 which I would like to recycle, but it is now obsolete and I cannot find anything other than a schematic which is reproduced below. ...
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votes
1answer
87 views

using power bank to power a nema 17 stepper

I was wondering if it is possible to power this 3.75V/1.7A nema 17 stepper with a power bank which have a 5v/1A output like this one for example . Ps: I am new to the electronic world .
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votes
3answers
89 views

Running 3-6V motors with 7.2V [closed]

I'm using the popular DIY motor: Which his operating voltage is claimed to be between 3-6V. I'm using a battery of 7.2V. I know that running the motor outside the recommended voltage range might ...
3
votes
2answers
216 views

DC motor and power

With DC motors, I believe the graph below depicts the typical performance: Does that mean, even for a high speed motor with a gearbox for speed reduction, the same characteristics apply? That is, ...
1
vote
1answer
69 views

Washing machine / microwave motor - AC or DC

If I take an old washing machine motor and try to convert it into a generator would it work and if so would it generate AC or DC? Same question with a microwave motor. I know it uses permanent magnets ...
0
votes
0answers
63 views

ringing shunt resistor on induction motor

I'm working on a three-phase AC induction motor driver. The main supply is 48V and I plan to operate in the 0-40A range. The six MOSFETs are driven by PWM signals via a gate driver. The PWM signals ...
1
vote
0answers
38 views

Purpose of resistors from phase to phase on 480V motor

I have inherited a project with a motor circuit that I cannot figure out the purpose of some resistors. It was initially designed for operation in Europe at 400V 50Hz. Since it is operating here in ...
0
votes
1answer
83 views

How to calculate the right motor size for a soil sifter [closed]

How would one calculate the proper size of an electric motor to properly drive a soil sifter? Assumptions: Screen: flat, 18"x24", 1/4" to 3/4" wire cloth (interchangeable screens), total weight (...
0
votes
2answers
47 views

measuring a bad motor and large current spikes in a brush motor [closed]

I am new to this forum, I am an EIT and I have been tasked to implement a fixture to measure high current spikes on brush motors when loaded and unloaded. I am at a loss here as I have never ...
2
votes
1answer
85 views

How to Raise and Lower an Object via Arduino/Photon

Completely new to anything dealing with hardware (Programmer person) and have no real clue as-to how I can accomplish what I want. The goal is to be able to move an object up and down (Specifically ...
2
votes
2answers
114 views

Function of characteristic curve of DC motors

I have found in the following graphic the characteristic curve of a locomotive with six DC series wound electric motors at 3000V. As a translation: the y axis describes, on the left, the force in tf (...
9
votes
3answers
1k views

In a brushed DC motor, why do the brushes have springs?

In trying to understand brushed DC motors, this post has been very helpful but I still have some fundamental questions about the brush mechanism. For instance, what is the purpose of the spring? And ...
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votes
1answer
46 views

Produce current

Ok, so I was trying our an experiment to generate minute current. I got a battery operated gear motor which can produce current to light ant led bulb when rotated. I am trying to create an automation ...
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votes
1answer
79 views

How to build an Electric Vehicle (explain like I'm five) [closed]

I'm a business major investing time to learn more about Electric Vehicles. For starters, I wanted to understand the elements that come together to make a simple Electric Vehicle, maybe a scooter. I ...
7
votes
2answers
291 views

How does a hair dryer change its motor speed? Diagram included

I'm working on a side project where I need to figure out how a hair dryer works...so I took apart a hair dryer and made a circuit diagram (below). I am much more mechanically inclined than ...
0
votes
1answer
42 views

Is it possible to over-power a 3-Phase AC motor with a AC Controller?

If I have a 200kw motor controller, and a 30kw motor, is it possible to overpower the motor with the controller? My application is for an electric vehicle (golf car, small bicycle, and so on). I'm ...