An electrical actuator converting electrical energy into rotational motion.

learn more… | top users | synonyms

2
votes
0answers
191 views

Controlling a treadmill motor

I'm recycling some spare parts of an old treadmill for a new project. I have the motor with its driver board, the elevator piston and the controller board. All works out of the box, but I need to ...
2
votes
0answers
112 views

Gear motor with encoder: minimum drivable step

I am fancying this motor http://www.pololu.com/catalog/product/2271/specs to motorize an X-Y stage. (Alternative High rpm motors with high reduction ratio and high encoder counts/rev are welcome ;) ...
2
votes
0answers
419 views

Analogue Hall sensored brushless outrunner motor position control

I would like to produce a low cost high power:weight servo drive using a brushless outrunner motor, like those use in radio control planes: Some of these motors leak enough magnetic flux out the ...
2
votes
0answers
215 views

Matching mosfets - linear servo amplifier (AB)

I'm replacing a bunch of burnt mosfets in a linear amplifier for a brushless motor. 3 phases Each phase: 3 pairs of totem IRFP240 / IRFP9240 in parallell. (no R in series) My main concern is ...
1
vote
0answers
29 views

In field controlled dc motor, why does the armature current remain unchanged even if it is affected by field flux?

Basically in a field controlled dc motor, the armature current is kept constant (via some constant voltage source) while the field current is varied which will vary the field flux and interacts with ...
1
vote
0answers
26 views

AC relay switch-off optimum phase?

I have a circuit which turns a 230V 50hz AC motor on and off by use of a relay. I've tried to arrange it so that the relay would be turned off when the current through the motor is zero. Of course, ...
1
vote
0answers
74 views

Monster moto shield + Arduino +Pololu 12V, 29:1 Gear Motor Encoder hardware problem

Overflow enthusiasts! I am trying to build a balancing robot with two wheels, using the polulu gear motor as mentioned above. In order to have a strong motor driver,the monster moto shield is used in ...
1
vote
0answers
59 views

Draw relation of rotation speed and output power of PMAC generator with brake resistor

I would like to draw a graph showing the relationship between rotation speed and power of an ideal Sinus PMAC generator with a brake resistor R(load) to be defined controlled via a 4Q Controller ...
1
vote
0answers
54 views

Overload relay nameplate

The following information appears on the nameplate / description of an existing thermal overload relay (for motor protection) I need to replace with a modern unit of same functionality: IEC 292-1 ...
1
vote
0answers
76 views

Current/Torque - curve for an ASM

There is this exercise where I don't have a clue how to get the solution. It's about asynchronous machines, where with the help of field coordinates the string currents (istr) are split up into ...
1
vote
0answers
52 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 ...
1
vote
0answers
57 views

How much has the power density of electrical motors and generators changed in recent decades?

I would like to know how much lighter (if at all) a matched combination of an electrical motor and generator with a given power output would be today, compared to a similarly powerful combination ...
1
vote
0answers
86 views

No output at H bridge during quick power drop

I used a H bridge with PMW control to drive DC motor in two directions. I observed a strange phenomenon that during quick voltage drop, the PWM output at M2 is cutoff, although the T4 gate PWM input ...
1
vote
0answers
165 views

Why doesn't this relay circuit work?

Objective: A device to prevent automatic restart of a motor (or pump) after power failure. Background: It is well known that aquarium fish are curious and will explore items in the tank. In the ...
1
vote
0answers
123 views

Capacitor bank with variable speed motor

I have a set of three pumps (power ~100 kW) with variable speed AC motors and I would like to know the best option(s) to reduce the cost of reactive energy. For instance, would it make sense to ...
1
vote
0answers
247 views

Use a 2N7000 in place of 2N2222A

Here's a description of both circuits. A ring shaped magnet is mounted on a brass axle and a set of bearings. Coil A and Coil B are wound on the same core. The magnet is placed about 1/8 of an ...
1
vote
0answers
761 views

Old variable speed AC motor wiring

As a disclaimer, I have a little electronics knowledge, but I'm no expert. I've been given an old 1940's Hunter fan and I'm working on fixing it up. I took the base apart and wiring is pretty bad - ...
1
vote
0answers
206 views

SEM Permanent Magnet DC Motor DPM 30R4 1500RPM 24VDC Output: 0-25kW & Brake

I am in the plannning stages of a project to build a pig rotiessiere. I have the above mentioned motor, but I am unsure of what type of power source is needed to run the motor and what can I do to ...
1
vote
0answers
672 views

L298N shield gives relatively low ouput voltage and current

I am using a L298N shield together with an Arduino to drive a 42mm 2 phases bipolar stepper motor. The driving voltage for the motor is 12V and the logic voltage for Arduino and the L298N shield is ...
1
vote
0answers
54 views

Why do my outputs look exactly the same for the Allegro 3901?

I am trying to capture results shown in Figure 8 of Allegro 3901 data sheet . My circuit looks like this: The channels above coresspond to the oscilloscope screen captures below: In the image ...
1
vote
0answers
495 views

How to drive dualsky ESC with arduino PWM? (Brushless motor)

I've recently received 4 Brushless motors, 4 brushless ESC's and 2 LiPo batteries. I managed to run the motors with my arduino and the servo library, but I'm not getting optimal results. I was ...
1
vote
0answers
88 views

External Accessories for VFD

I am trying to decide what external accessories I need for my VFD 7.5 HP for a 1500Watt Vibrator motor. The three options I have come up with are below. I'm using a standard 220VAC line supply from ...
0
votes
0answers
26 views

Measuring the frequency of motor vibration

I'm using a motor from Adafruit. (Product page link: https://www.adafruit.com/product/1201) I measured the frequency of vibration with different voltages, but the frequencies are quite different from ...
0
votes
0answers
17 views

Interfacing with Series Elastic Actuators using Simulink

I'm in a newly founded student team where we are building an exoskeleton to let paraplegic people walk again. As the technical manager I am tasked to analyse the feasibility of tech which allows us to ...
0
votes
0answers
31 views

1 phase induction motor used for pumping of water to syntax

If 1 phase induction motor which is used for pumping of water, is taken the air, means.. I wil run this without water, but after water is there, but it won't work at all.. Means it takes air, how to ...
0
votes
0answers
43 views

Circuit board dead if motor disconnected

I have a question about this configuration. I am using a motor with the garage door opener circuit board. I want to remove the motor yet still have the circuit board functioning. If I unplug the ...
0
votes
0answers
36 views

Regenerative braking torque ca[ability

I have been trying to calculate the maximum torque that be applied to my driveline through regenerative braking on my DC motor, using the equations from this paper: ...
0
votes
0answers
52 views

Rotating plate motor with position feedback

I am currently building a 3D scanner and I want the camera/laser to be fixed and the subject to move on a rotating plate. This is where I am now : the rotating plate design. Unlike most general ...
0
votes
0answers
49 views

How to control direction AC motor with 555(clockwise-off 5sec-anticlockwise)

How do I control an AC motor direction with a 555 timer monostable delay configuration and a few relays.The nature I want it to be is anticlockwise all the way(with a press of a button) then press ...
0
votes
0answers
51 views

How to determine motor's pinout

So I've savaged an old Maxon DC motor. I've searched thoroughly for some documantion but found none. So I have 6 pins which I guess should be: V+ V- Vcc GND A B Is there a way to determine which is ...
0
votes
0answers
25 views

How does Sensorless Vector Control of an induction motor achieved?

I'm trying to make sense of the current and rpm of an AC motor controlled by a VFD drive. Here is the device: ...
0
votes
0answers
55 views

Adapt electric motor to manual seeder

I am limited on my electronics knowledge, but I want to adapt an electric motor to a manual corn and bean seeder. Why? Because it is very hard agriculture work. It is needed two people, one in the ...
0
votes
0answers
82 views

BLDC Motor Control - Determining PWM Switching Frequency

I've read that the PWM switching frequency should be anywhere from 200hz (high inductance motor) to 64khz (low inductance motor) in order to minimize torque/current ripple at perhaps the expense of ...
0
votes
0answers
15 views

Determining V/RPM relationship based off of RPM/torque/current curve?

I am trying to determine what voltage will give me a X RPM of a motor. The motor can be found here The pdf showing the torque/RPM graph can be found here. I have an idea of how to go about solving for ...
0
votes
0answers
41 views

DC or Stepper for exoskeleton arm

I want to try to do an exoskeleton arm, so I need at least two motors, one to simulate the power of biceps and another for shoulder, I had only use stepper motors and dc motors, but Im not sure if ...
0
votes
0answers
32 views

Controlling Linear Actuators

I have two 24in linear actuators (http://www.progressiveautomations.com/linear-actuator) that run at different speeds when I connect them in parallel to a 12V battery. How can I get them to run at ...
0
votes
0answers
99 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 ...
0
votes
0answers
174 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 ...
0
votes
0answers
43 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
0answers
94 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
23 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
75 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
0answers
88 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
0answers
92 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
0answers
70 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
0answers
46 views

Induction motor constant flux calculation

I am working on a model of Indirect Field Orientation Control of Induction Motor in Simulink/Matlab. I have it all worked out, except the flux command. I would like to keep the flux at constant value ...
0
votes
0answers
62 views

using a sycnrhonous motor to drive the voice cone in a speaker

It is possible to consider any arbitrary signal as a continuous function of phase and amplitude. In particular, a digitized audio recording (assuming Nyquist was satisfied) can be transformed into a ...
0
votes
0answers
100 views

PM synchronous motor parameter measurement

I am trying to find the parameters of a surface mounted PM synchronous motor using the application note AN4680 (PMSM Electrical Parameters Measurement) and had some queries regarding it. The Ld ...
0
votes
0answers
79 views

Forgot to connect ground for H-bridge, now it doesn't work?

I have an TLE5206 h-bridge IC that can handle 5 amps and I'm giving it a supply voltage of 12V. I was just testing the motor with the power connected but I noticed that the ground cable broke off ...
0
votes
0answers
34 views

Explanatory electromechnical animations: What software used?

My friend is trying to show a hall effect sensor setup. He wants both the electrical oscillograms and the mechanical view of a rotating signal (from the motor). What software exists to aid in ...