An electrical actuator converting electrical energy into rotational motion.

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53 views

Understanding motor controllers and example application

I'm rather new to the world of motors and motor control circuits - about all I know is that you need one. My intended application is to take a DC motor and create a "servo", which I understand to ...
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2answers
57 views

What capacitor and resistor to use in my simple circuit?

I’m quite new to electronics but I’m making progress learning about it. I would like to make a circuit to control the speed of two electromotors. (Or two circuits to control separately, whatever is ...
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1answer
57 views

Mechanical Power (Application) and Electrical Power (Stepper Motor) Discrepancy

For my application I need a torque of \$\tau=0.87 \, Nm \$ and a speed of \$ w=140 \, RPM \approx 14.65 \, rad/s \$. This gives me a mechanical power \$ P_m=12.75 \, W\$. $$ P_m=\tau w $$ I have ...
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1answer
68 views

PMSM inductance in DQ domain

The “abc <-> DQ” transformation matrix used for transforming currents, voltages and magnetic field can they be used for transforming inductances also? as given below-
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0answers
21 views

Designing a motor driver for my robot

I'm new to electronics and i have a task at hand : to design a motor driver board for my turtlebot(an open source robot) . Having said that , im using a johnson gear side shaft motor that draws at max ...
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3answers
318 views

Measuring force developed by a robot

I've been playing around with a Lego Mindstorms NXT robot, gearing it for speed and power. To my dismay, when geared for power, it wasn't any harder to stop than when geared for speed -- I suspect ...
0
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1answer
90 views

Load sharing using asynchronous motors

I am involved in the design of a system composed of: multiple asynchronous motors, each equipped with separate drive, all acting in parallel on a load, via a common rack and pinion transmission. ...
0
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1answer
70 views

Regenerative braking at any speed below maximum - how is it done?

My mobility scooter has a motor controller with regenerative braking - but regeneration seems to take place even at low speeds, well under the maximum! I know it does this because if I reduce throttle ...
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3answers
60 views

Motor undervoltage

In the situation of a motor losing voltage, say it's rated for 240vac, but it's only receiving 190vac, what happens in terms of the power triangle? Does current increase, does it slow down and reduce ...
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2answers
75 views

Voltage spikes when driving DC motor with N-channel MOSFET

I'm trying to drive a DC motor (12V, 100W) with MOSFET IRFP054N. PWM frequency is 25 kHz. Here's the schematic: I know DSEI120-12A is not the best diode for this but I don't have any better right ...
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4answers
157 views

Torque and Back EMF Waveforms of Brushless Motors

For simplicity, I'm going to be talking about a single stator phase. I understand that torque is proportional to current, and that back EMF is proportional to angular velocity. However, after ...
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3answers
544 views

Why did the designer use this motor?

I was taking apart this thing that I bought from the dollar store, its this glass block with an encased sculpture that sits on a revolving deck. (see photo below) The deck powers 4 LEDS with ...
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0answers
17 views

How to bring the back EMF and current in phase to get max torque in IPM machine

I am trying to control the speed of an IPM motor using field oriented control. I have a problem, my back EMF and stator current is out of phase so I get negative torque. So does anybody have an idea ...
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1answer
78 views

Boost starup of a motor with a capacitor

I have a RC car and I wonder if its startup speed will increase if I mount a capacitor in parallel with the battery. My thinking is that while the car is idling the capacitor will load. When I start ...
0
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0answers
21 views

Cable cam trolley equipment help [on hold]

I'm no electrical guru by any means.Thats why I'm here. I need help in locating the correct pieces to make a skycam that will be suspended by a cable over an event area. It will travel back and forth ...
6
votes
2answers
303 views

Why do we need a ramp for stepper motor?

I am a newbie and trying to understand how i can run a stepper motor. The concept i had in mind was that steppers need digital pulses to run, and i tried it out too. I was able to run the stepper i am ...
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0answers
45 views

Selecting motor for a DIY wheelchair stairlift

I need to make an wheelchair stairlifter for my stroked mother similar to : So I need to find out one motor in range of 200 Wat for lifting a 200KG load in slope of 43 degree from these options: ...
0
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1answer
63 views

Desired response of PI controller in motor vector controller

In vector control (field-oriented control) of motors (specifically induction motors), a rotating reference frame is attached to the rotor flux to give "DC" values in the current controller. This ...
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2answers
55 views

Mosfet time and PWM frequency relation

what is the relation that I have to take into account when I select a mosfet(or a transistor in general) for pwm driving about rise/fall/turn off delay/turn on delay and the PWM frequency? How to ...
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2answers
124 views

How to wire up a single-phase electric blower motor

I have an Electro ADDA C80M-2 0.75kW single-phase blower motor that I need to hook up, switched, to power a cyclonic dust separator that I've built. I thought it would be a piece of cake: pop off the ...
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3answers
90 views

How and why is a magnetic field transmitted with alternating current?

I apologize for the basic question (or if it is incorrect in its assumptions,) but how does one account for magnetism in alternating current? If I generate alternating current to a motor, why do my ...
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2answers
56 views

How to transfer electrical power from stationary to rotational part.that can be used for POV display?

I have been researching how to transfer electrical power from stationary to rotational part. Some of them showed the means by using slip spring rings like in this website ...
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2answers
56 views

What factors can determine the constant coefficient when calculating torque?

In this servo motor's datasheet, both motor have the same torque of 0.32 Nm, have the same power of 100w, but have different rated currents and voltages. It seems that the "torque" relates to the ...
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1answer
170 views

DC motor spun clockwise then counter clockwise creates AC current?

I am making a generator with a DC motor but the style of turning the rotor would be clockwise and then counter-clockwise, and I would want to capture as much current as possible so I hope it could be ...
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3answers
256 views

Running 7V motors with 2x 3.7v batteries

We're really enthusiastic to build a homemade quad-copter with almost no knowledge about such things. We will probably use Arduino and Bluetooth to control it, but we have a question about the motor ...
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1answer
46 views

Why does the current in autotransformer motor starting gets reduced squared in relative to the voltage?

Say, relatively, the motor's full voltage rating's voltage, current and torque are 100, 100 and 100 Why does when the autotransformer tap is set at 80%, the motor runs at 80 64 64 65% and 50% as ...
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2answers
59 views

Minimum current to measure from a 30kW motor?

We've been troubleshooting a problem here at work and we're kinda stuck so I thought about asking for some opinion from you guys. We have a 30kW 240V 3-phase motor with a rated current of 109A that is ...
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1answer
60 views

Clock / timer activated 2 second voltage timer for wiper motor project

Ok, I need a 12 volt voltage timer using clock or timer for a wiper motor. I am working on a project in my garage. Simply put, I am wanting to use a wiper motor that will open and close a spring held ...
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0answers
37 views

Control multiple high current channels in mass production

We have to controll 4-6 channels with high current (3-5A ) ,with a micro controller, with control voltage of about 3v . One ...
0
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1answer
57 views

Driving a 4.5V motor with PWM from an Arduino

This is a basic question but I would appreciate help. I have: An Arduino A 4.5V DC motor Various transistors, like BC337, 2N7000, 2N2222A What I'm trying to do is very simple: control the motor ...
16
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1answer
9k views

How can I implement regenerative braking of a DC motor?

I know that many electric cars are able to convert the momentum of the car into stored energy in batteries, rather than convert it to useless heat at the brake pads. How does this work? How can I ...
2
votes
3answers
327 views

Calculator Printer Control (how to drive Epson dot matrix printer)

I have small dot matrix printing device that I'm trying to control (i.e. print to) with a Parallax Propeller board. (See images below.) It's the printer from this: ...
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3answers
71 views

Transistor with different voltage in colector and base

I have a small LED of 5mm and an arduino powered by 9V. When I connect the LED to Vin (9V) using a 330 ohm resistor the LED brights very high. When I connect the LED to 5V (from arduino) using a 330 ...
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3answers
60 views

Using a motor with DC

I am using a Lego DC motor with a 9V battery which can provide up to 1A of current. I called Lego support and they said the motor draws 300mA of current. What does that mean? If I plug the motor to ...
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1answer
34 views

“Standard orientation” for stepper motors in data sheets

I just finished getting a SOYO 6V@0.8A unipolar stepper motor working, and wanted to know more about an issue I faced while doing so. I used the stepping sequence below with an L293D chip to drive ...
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2answers
147 views

Is my MOSFET H-bridge design correct?

Can anyone check over this motor controller design I made? I'm running off of a rudimentary understanding of electronics (just a hobbyist), so I'm not fully confident in it yet. Kamil EDIT: ...
2
votes
3answers
77 views

Can a DC motor be of specification 320Watts, 3A, 24 V?

The above is the specifications of a wheelchair DC motor I'm trying to use as my hobby project. My question is how can a motor of 320 Watt and ...
1
vote
1answer
69 views

Operation of a Growler to test armature shorts

Can someone explain to me how a Growler for testing electric motor armatures works please? I have obviously read the Wikipedia Growler page but it is still foggy. So the growler unit acts as the ...
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0answers
41 views

Can I run a 3s ESC from a 12V power supply (car battery)?

I am building an ROV, and my thrusters will require 12V. The voltage source will be a 12V car battery. I have found this ESC and it seems to be just what I need (well over my ~9A draw and has ...
0
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1answer
119 views

How to supply multiple 12V DC 3 amps motors?

I need to supply four DC motors 12V @ 3 amps with a battery pack. I was wondering which characteristics should have an hypothetical battery pack to supply all four motors together. How many volts ...
3
votes
2answers
913 views

Choosing relay to operate water pump

Based on my research so far, I've concluded that a relatively low-cost, yet reasonably reliable way to control operation (on/off) a motorized water pump, is a well spec'd EM-relay with flyback diode. ...
2
votes
2answers
303 views

Controlling speed of motor through L293D using TLC5940NT

I am trying to control a DC motor through an L293D. Ultimately I am controlling it with an Arduino, but I am trying to use a TLC5940NT chip as an intermediary to increase the number of outputs that I ...
1
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1answer
48 views

Spice simulation of a motor switching power supply

I'm designing a switching regulator for motor controlling, I have tried this circuit with spice but it does not work: The problem is that the voltage on the load of the regulator never goes down, ...
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2answers
104 views

Can I solder back together a single broken copper winding wire in an electric washing machine motor? [closed]

Can I solder back together a single broken copper winding wire in an electric washing machine motor? This is the motor: ...
5
votes
3answers
166 views

How to tackle regenerative current in my H-bridge

I am using 2 of the following H-Bridge to control 2 x 24V 350W electric scooter DC motors. The power is from 2 x 12V 12AH SLA batteries in series. EDIT: These are the entire schematic and PCB ...
7
votes
5answers
11k views

get a DC motor from household device?

I was wondering if there are any common household devices from which I can get a small DC motor (I have a 9V battery...) to use with a breadboard? It'd take me a long time to buy one so I was hoping ...
0
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0answers
63 views

Making a simple wireless remote control circuit to control a micro motor

All I need is to be able to activate a small 4mm by 6mm micro motor with a remote wireless switch. Just on and off. I have searched everywhere for help and I can't figure anything out, I am ...
0
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1answer
53 views

DC Motor Coil Voltage

I have a DC stepper motor that appears to be powered by 75V supply voltage (I measured this). However after connecting the motor to the controller (supply), I measured the voltage across the coil ...
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3answers
3k views

Using a motor to open doors

I have made a wooden case to hold both my Xbox 360 and my PS3. It's as wide as both consoles laid down next to each other and as high as the console. it has 2 doors on the front, one for each console. ...
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0answers
25 views

What factors affect the choice of a particular variant of the Clarke transformation?

I have a question about the different variants of Clarke transformation. In one of the responses on this site, I read the following: 3->2 symmetric component transforms (a.k.a. "Clarke") are not ...