An electrical actuator converting electrical energy into rotational motion.

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64 views

Power adapter versus Power supply

I have a mini water-pump/motor hooked up to an LM338 (similar to LM317, but capable of higher current output). I set up the LM338 to create a 6.1-V output, from an 18-V input; this was done by ...
1
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4answers
155 views

Is Power consumed by a motor under various load conditions constant?

Does a motor (dc /Induction/Synchronous ) consumes more power when operating at higher load than when operating at some lower load? Or power consumption remains constant/same in both cases? What I ...
6
votes
2answers
2k views

how big are the FETs used to drive Tesla cars

So I've been looking into bldc and motor drivers lately (ESCs). Generally larger the BLDC motor the larger the FETs need to be in order to suppluly needed current. One can do this either by using a ...
-8
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4answers
84 views

One motor connected to 4 generators or alternators - why would it not produce more electricity than it consumes?

OK so here is something I have been curious about. Let's say we connect a single electric motor (driven by e.g. an automobile battery) to 4 different generators (or alternators). Would it be ...
3
votes
2answers
371 views

Precision angle (0.5° or better) with a motor

For a project, I am using a Hall effect absolute rotary encoder (AS5048B from AMS: http://www.ams.com/eng/Products/Position-Sensors/Magnetic-Rotary-Position-Sensors/AS5048B). It claims to have 14-bit ...
0
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4answers
110 views

Standard way to tension a string using a motor?

I am dealing with a design that requires me to tension a small string, about 5 inches long with a diameter of about 1-2 mm, and then keep it under tension (lock it in place) without the use of ...
0
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1answer
127 views

Arduino Motor Control Circuit with Power Transistor and H-Bridge

I'm new to motor control, and I'm trying to create a circuit to control this motor: http://www.robotshop.com/en/banebots-rs-550-motor-12v-19300rpm.html The key electrical characteristics for my ...
3
votes
3answers
387 views

What do i need to get this motor running off a car-battery?

I'm going to build a motorized barn-door mount for astrophotography, but have ABSOLUTELY no experience with motors, circuits or anything else related to the motor. This is the motor I bought: ...
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2answers
67 views

Crude simulation of a dc motor

I have a 24V battery bank and would like to discharge it in order to test the performance of different solar charge controllers. Eventually the batteries will supply a 2hp (1500W) DC motor and it is ...
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2answers
70 views

How to stop my motor from resetting my microcontroller?

I'm assuming (no way to verify) that when the motor pulls too much I get voltage spikes which cuts out my microcontroller. Here's my circuit, any suggestions on how to fix this issue? The left chip ...
0
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1answer
36 views

Turn Stepper Motor Off when Idle

I was wondering if there is a way to cut power to my stepper motor when it is not in use. I dont particularlily need it to hold its position because in my setup it doesnt really need to torque agaisnt ...
0
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1answer
59 views

why 'V' curve of synchronous motor doesn't touch D.C. field current axis?

Why synchronous motor armature current doesn't become zero with field excitation change ? it can be seen from 'V' curve.?
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0answers
26 views

What should I use to program these ESCs?

I am working on a project involving brushless motors, and as such I will need a brushless Electronic Speed Controllers (ESCs). If I were to buy one of these two ESCs, what would I use to program ...
0
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1answer
64 views

How accurately can an ESC detect the number of RPMs?

I am working on a project involving brushless motors, so I got an ESC to power them. The problem, is that I need to accurately control the number of RPM. Can an ESC, like this one, control the number ...
1
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2answers
108 views

Identifying live, neutral, and ground wires cold

I have a European (230 volt AC motor, no markings), 1 phase (I think). It is roughly 6 inches long, just to get a sense of the scale. It basically wobbles when current is supplied to it. 1) I ...
3
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0answers
46 views

converting induction motor winding to reluctance motor winding

I want to build simple reluctance motor for education purpose. I have couple of small 3 Phase AC Induction motor with 24 slot stator lap winded for 4 pole design. I want to convert it to reluctance ...
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0answers
47 views

Can ESCs (for brushless motors) be quickly reversed?

I am building a set of reaction wheels, using old "IBM Deskstar" harddrives. I want to power the brushless harddrive spindle motor using an ESC, such as those for model airplanes. Since I'm building ...
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0answers
32 views

gate position control using single phase induction motor

I want to control the position of sliding Gate through an induction motor. For initial experimentation I shall use 0.25 Hp single phase induction motor. Motor will require 20-25 rotations for full ...
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votes
3answers
920 views

Why don't brushless motors “short”?

You always learn in school that you should never short terminals of a battery because the wires overheat from the large current. If you look at a brushless motor, you'll see that its nothing but ...
0
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2answers
74 views

#2 L7809CV regulators, connected to #2 9vdc motors

I simply want to connect 2 motors as i show in the image, using a 12VDC power source and 2 #L7809CV, right now the circuit is this you can see in the image i made. The GND its the same source for ...
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0answers
49 views

AC Motor operating region

I've been using an ABB IRB 2400 robotic arm to gain experimental data and write a report based on the data. I found that when I operated it at different speeds for pre-programmed paths, I got a ...
0
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1answer
74 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
78 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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0answers
34 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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1answer
122 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 ...
0
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3answers
64 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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0answers
25 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 ...
5
votes
2answers
175 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 ...
6
votes
2answers
375 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
83 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: ...
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votes
3answers
98 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 ...
0
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2answers
64 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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1answer
53 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
63 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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0answers
44 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
votes
1answer
82 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 ...
0
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3answers
79 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
67 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 ...
1
vote
1answer
117 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 ...
2
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3answers
108 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
2answers
202 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: ...
0
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0answers
97 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
votes
1answer
90 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 ...
0
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2answers
221 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: ...
1
vote
1answer
57 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, ...
0
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0answers
282 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
62 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 ...
5
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3answers
203 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 ...
0
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0answers
40 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 ...
1
vote
1answer
96 views

Need help isolating source of interference

I'm pretty new to electronics, but have been successfully working with a Spark Core (www.spark.io) and some simple drivers/circuits for now. That said, I've run into a problem. I have a Spark Core ...