An electrical actuator converting electrical energy into rotational motion.

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0
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3answers
150 views

Reversing polarity of motor with timer

I have a timer that allows me to preset times and run a motor for a predetermined amount of seconds. I need this to reverse polarity as soon as this predetermined time has expired. The timer is a ...
-1
votes
0answers
19 views

Electric motor drive systems

I am looking for a way to learn about electric motor drives. It would be ideal if I could come across something similar to an online course with a purchasable motor-drive kit for performing hands-on ...
-1
votes
1answer
45 views

Electric style motor speed control

I was just wondering how I would go about making a pedal that controls the speed of a motor. It would also have to include reverse motor capability. My tech book at school already has a circuit for ...
1
vote
2answers
63 views

Is it possible to change the speed of an AC motor(drill press) without losing too much torque?

I have a drill press as in the image below, it runs from 110V AC 60Hz and has internal belt reduction. Unfortunately however for some materials and hole widths, I need it to go even slower than It's ...
0
votes
2answers
20 views

Calculate rotor slip without knowing synchronous speed

I am given the rated values of a squirrel cage induction motor: A 300hp, 2300V, 3‐phase, 60Hz squirrel‐cage induction motor turns at a full‐load speed of 590r/min. What is the approximate value ...
9
votes
4answers
5k views

Why use DC motors for driving elevators?

This New York Times article says that on November 14, 2007 Consolidated Edison Company was going to end supplying direct current to the remaining several buildings that used those to run elevators. I ...
0
votes
1answer
38 views

How is low starting torque of asynchronous AC motors addressed when driving elevators?

Long before variable frequency drives became popular elevators were often driven by dual-speed asynchronous AC motors. Switching speeds was done by changing the number of poles (which is done by ...
0
votes
1answer
68 views

Fan Control using Motor Driver, looking for suitable solutions

I want to control the speed of a fan (which is a 2-phase brushless DC motor). I am currently using a suitable power supply to run the fans. My source is a Data Acquisition device that outputs up to ...
2
votes
2answers
283 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 ...
0
votes
1answer
54 views

How Number of commutator segments,air gap between the segments of brush dc motor affect on performance of DC motor..?

plese help me about how Number of commutator segments,air gap between the commutator segments of brush dc motor affect on performance of DC motor..?? now if we we change the number of commutator ...
1
vote
2answers
52 views

How does a synchronous motor know to increase current when the mechanical load is increased?

Consider a very simple singe phase synchronous motor, such as the one shown in figure 1. This motor will not be self starting, but if an AC voltage is applied and the permanent magnet is given an ...
0
votes
0answers
59 views

Control tons of servo motors with one pin on Arduino?

I'm controlling 15 servo motors with Arduino Uno. The 15 servo motors will be doing the same thing all the time, so I'm trying to using one pin for all of them (But I'm using external power source for ...
3
votes
2answers
1k 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. ...
0
votes
2answers
74 views

Need help to vibrate a motor for an original musical instrument

everyone. I am asking you to help me out for making original musical instrument. The goal is to vibrate a small motor by square wave signal witch is generated in a synthesizers in my Mac. Here is ...
2
votes
2answers
518 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 ...
0
votes
1answer
35 views

Is Motor KT Linear with current?

This may be a little basic for some. Sorry in advance... I would like to use a large 3ph motor to perform a fast, controlled, stop. The rated motor torque is 850Nm @ 242A. My inverter claims to ...
0
votes
1answer
95 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 ...
3
votes
4answers
6k views

Build an H-Bridge Motor Driver with 4 N-Channel MOSFET

I have bought 4 N-Channel MOSFETs to build an H-Bridge Motor Driver. My Motor drive and my power supply voltage is 12v. My TTL logic voltage is 5v as I want to speed up/down the motor with uC PWM. Now ...
0
votes
1answer
104 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-
0
votes
0answers
11 views

PM Synchronous motor Id-Iq current control

I am trying to implement the current control (Id, Iq) of a four pole PM synchronous motor. I am having trouble in making the Iq current follow a set reference. I had also implemented a cascaded ...
-1
votes
0answers
34 views

Half Bridge Driver [closed]

I am new to Motor sections. We are currently looking for Motor driver, since the old part becomes obsolete. Actually i need to drive 3 phase 5V BLDC Motor. I searched in most of the distributors ...
0
votes
0answers
20 views

How do I power / control a brushed 115V AC motor?

How do I power a brushed 115v AC motor? Would there be any potential damage from just wiring it to just plug into the wall or do I need a transformer and a capacitor or something? Thanks!
0
votes
1answer
75 views

Is it possible to run a motor inside a black box by applying an EM field, without knowing anything about the motor?

Is it possible to run an electric motor located within a container by applying an external EM field over the container, if you do not know anything about the motor? The container with the motor would ...
0
votes
3answers
59 views

H-Bridge with 1 PWM and 1 Output

I'm looking for a solution to control the direction of a powerful DC Motor. I came up with the idea to use a H-Bridge. Since the motor uses up to 3.2A the amount of possible H-Bridges is quite ...
0
votes
0answers
34 views

DC Motor Speed Control With 555

Can you please explain why this circut is not working in simulation. I get GMIN Stepping failed, too many iterations errors. Is there something wrong with the design?
0
votes
0answers
34 views

Arduino UNO not working with L293D

I am creating a simple robot that is controlled by an Arduino UNO, and given instructions by a button matrix. One can press 4 buttons for Forward, Backward, Left and right on on the matrix array, ...
0
votes
0answers
21 views

Nonunfirm air gap modelling

Is there a chance to do model of 3-phase induction motor with nonunfirm air gap not using ton of maths? I'm planning to use matlab and dq transformation model and on the out get frequencing of torque ...
0
votes
0answers
21 views

Is the armature resistance of a DC motor the sum of the resistance of each winding?

I am aware of a number of methods of measuring the armature resistance of a DC motor including locking the rotor, giving a fraction of the rated voltage, measuring the current and calculating the ...
0
votes
2answers
81 views

Does frequency equal the number of steps a stepper motor will do?

http://www.thorlabs.us/thorcat/ETN/ZFS13B-Manual.pdf I am supplying a driving PWM signal to this stepper motor. However, I want to specify exactly how many steps to take with this motor. Does the ...
2
votes
0answers
30 views

BLDC speed/torque control with L6229 or L6235

I'm trying to control 12V 12,000 rpm BLDC motor with 3x120° Hall sensors using ST evaluation board based on L6229 IC. I tried to control motor's speed by feeding PWM to FWD/REV pin as suggested in ...
0
votes
1answer
34 views

Powering up arduino with Xbee and a 6V (run on 5V) motor

I am working on a small project where i'll need an arduino to control a motor wirelessly using Xbees. I have a 7.4v lipo battery I am wondering will there be a problem or insuffciency if i only use ...
0
votes
1answer
46 views

What is a disable input for on a motor controller for?

I'm trying to figure out this motor controller I recently got and it has two pins called PWM / D2 and PWM / D1, disable inputs. I don't understand the description for them and don't know what they are ...
0
votes
0answers
31 views

L293D for STM32 F4Discovery

I'm trying to control 2 DC motors with a L293D driver and a STM32F4 Discovery board, but I'm afraid that I will break the Discovery. I have read that I cannot directly connect a motor to the GPIO pins ...
0
votes
1answer
88 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 ...
0
votes
3answers
72 views

Push power assisted trolley with one finger

I recently saw a demo. One man pushed a power-assisted trolley using only one finger. The trolley was loaded with ~40kg stuff and it started from standstill on a up-slope when the man pushed it using ...
0
votes
0answers
18 views

lmd18245 dc motor driver

How to build dc motor driver lmd18245t. wanna control dc motor with arduino uno by pwm signal so how make driver circuit using lmd18245t ic and in pic. i made circuit schematic is this correct or any ...
0
votes
2answers
76 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 ...
0
votes
1answer
45 views

How to Reduce Serial Noise from Refrigerator

I am controlling the compressor of a compact refrigerator using an ArduinoMEGA and an optoisolated relay block. The Arduino is connected to the PC using a serial over USB (Atmel version). Since the ...
2
votes
4answers
153 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 ...
0
votes
1answer
37 views

Active electric motor for on specify voltage

Is it possible to power on electric motor ( a little ) only when the input voltage is 1V by example. The electric motor is supply by another source (9V by example) With diode?? Or something else? ...
0
votes
2answers
100 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 ...
0
votes
1answer
105 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 ...
0
votes
0answers
43 views

What is the reactive force on an electric motor?

I'm trying to apply Newton's third law to electric motors. If an armature is rotating at high torque, to move/rotate an object, what is the equal and opposite force being applied to the motor? Is it ...
0
votes
1answer
72 views

How do I supply power to two 18v 2.4 amp motors?

I have two of these motors: http://www.radioshack.com/radioshack-super-speed-9-18vdc-hobby-motor/2730256.html#q=motor&start=6&tab=tab1 According to Radioshack's specs (which may be off, not ...
2
votes
1answer
38 views

Where to buy PMSM motors? [closed]

I read a research paper that explains why permanent-magnet synchronous motors (PMSMs) are better suited for high-precision position control than brushless DC motors (BLDCs). I'd like to buy one, but ...
1
vote
1answer
89 views

Resistance and Inductance of a ceiling fan motor needed to spec snubber

I'm looking to specify (well, suggest) a RC snubber network for someone over on diy.se who is having EMI problems with his ceiling fan knocking out his TV briefly on turn-off: ...
0
votes
1answer
63 views

Make a brushed DC motor move “free”

I want to place a DC motor on the driveshaft of a marine steam engine. Since i do not want to loose or add power to the drive but only having the motor there for backup reasons, i want to let the DC ...
0
votes
1answer
65 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.?
21
votes
11answers
6k views

I'd like to learn how to make my own USB gadgets

I've been writing Linux character device drivers for other people's stuff for some time. I'd like to find a new hobby and the thought of making my own USB gizmos seems really neat. I would be ...
0
votes
1answer
36 views

Dupont connector for 5A

I have to do a connector adapter, that has to handle 5A current, from a pwm motor driving circuit(power mosfet), to the motor. I have not found the current rating for dupont connectors It is ...