An electrical actuator converting electrical energy into rotational motion.

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85 views

Running a 24V motor on a 12V boat system

I'm trying to design a jigging machine for a fishing boat, using a RaspPi as the controller. (A jigging machine jerks a 1kg lure up and down near the sea bed, and pulls in a fish when it's hooked.) ...
0
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1answer
54 views

Power factor correction AC motor

Four 240v, 50Hz, 16kW motors are installed in a factory. Each has a power factor of 0.86 lagging and efficiency of 78.2% while running. Determine the shunt capacitance required to deliver unity power ...
0
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1answer
53 views

Step up converter for electrical motor, 110V to 230V

Wasn't being careful when purchasing a vacuum pump for silicone de-gassing so I ended up with an american standard. (I live in sweden) Tried to search this but with limited knowledge comes limited ...
1
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1answer
47 views

Do stepper motors fail if not allowed to rotate?

I have a rudimentary understanding of the operation of a stepper motor. I have a situation in which a stepper motor will try and rotate something; but if the bar is already in the stop position the ...
0
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1answer
67 views

Inkjet printer and digital encoder

I'm looking at some components of an inkjet Does anyone know why it uses an optical encoder on the scroller shaft? Doesn't the shaft rotate by a step whenever the print head reaches the head? Why ...
0
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1answer
42 views

Asynchronous motor joule loss calculation

I'm wondering if this is the right place to ask my question, but i hope to get the answer. How I can calculate the Joule loss with just those indication output and input power, voltage, current, and ...
1
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4answers
113 views

Charging a battery from both solar panel and wind generator

I am a complete newbie to electronics. I have taken up a project that basically aims to generate power using solar and wind energy due to personal interest and have done research but I seem to have ...
0
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1answer
39 views

Can I convert a split phase motor to a permanent split phase one?

The induction motor I am using has a dead current relay and finding the part is proving quite difficult. The motor has neither a run nor a start capacitor. I am considering the idea of switching the ...
0
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3answers
80 views

What is the purpose of a relay between a switch and motor?

I was disassembling a belt disc sander today and noticed that there was a rather large relay between the switch and the motor. The relay consists mostly of a large copper coil. The motor doesn't have ...
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2answers
125 views

PWM and DC motor speed [duplicate]

I'm hoping to try to control the rpm of a DC motor. AFAIK, I'd need to generate PWM for that. How does one find out which frequency is needed for a certain rpm? Is the frequency of the PWM signal ...
1
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1answer
77 views

multiple motor h bridge?

I see a lot of h bridge diagrams on the internet, more or less like this: If I wanted to connect let's say 4 motors in h bridge configuration while using the same power supply (12v) for all 4 of ...
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2answers
41 views

Will a PWM-Enabled MCU Work With Any Motor?

Why do so many MCUs specify what kind of motors they work with? For example: http://www.microchip.com/pagehandler/en-us/technology/motorcontrol/ Surely, the MCU has no concept of a motor and it ...
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2answers
159 views

How to wire 3 phase motor to VFD

I am trying to wire a new motor to a variable frequency drive (VFD) and having some trouble figuring out how to wire the motor to the VFD. The motor is a 1 HP, 3-phase, 208-230/460 volts, and I'm ...
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2answers
61 views

Linear actuator torque control

I want to build aplication where I will provide defined force with linear actuator. DC motor is going to be stalled most of the time and and controlled torque should be applied. So at the actuator ...
0
votes
3answers
68 views

How to model a DC motor in LTSpice if only its nominal voltage and max. current is known?

Is there a simple way to model a DC motor in LTSpice when controlling it with a PWM signal? Lets say the motor is 9V/2A. I was thinking the safest way to measure the stall current and use the nominal ...
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2answers
71 views

Replacing 5 V pin with battery not working

I have a small breadboard that has a L293D motor controller and 2 DC motors. The board is hooked up to a Nordic DK and everything on the PWM side is fine. The breadboard is powered by the development ...
0
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1answer
33 views

How to auotmatically reverse a 12v motor on successive activations

I am a novice looking for as simple a device / circuit as possible to automatically reverse a small gearmotor ( stall torque max .5 A, 12 V DC) powered by a 2A 12V source, wherein the motor is to come ...
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1answer
61 views

Pressure sensing controller using Stress Ball

I am thinking of a project proposal for my robotics course and we are required to make one that has a potential application on physical therapy or medical fields. One thing that came across my mind is ...
0
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1answer
54 views

What determines the required bandwidth of current sensors in an electric motor drive?

Most motor drive control systems incorporate current feedback of some description. What determines the required frequency response or bandwidth of the current transducer? Is there any other ...
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2answers
148 views

Modifying a thermostatic radiator valve for micro control

The photo below shows a electrical thermostat controller. The upper part is the motor with a gear. The motor has two wires attached. A red and a black one for the current. What this component does ...
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1answer
49 views

How can we find the polarity of dc motor and why we connect motor with thick wire?

DC MOTOR How can we find the polarity of dc motor before connection ? Why we connect thick wire with armature winding ? Internal winding wire diameter is very thin in compresion to external wire by ...
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1answer
57 views

Arduino UNO: How to connect 2 way power for DC Motor?

Currently I'm using Arduino UNO R3 board. I want to drive small DC Motor using same power source as the arduino is using. My motor driver is TB6612FNG and it works well. I have two motors. One ...
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votes
4answers
782 views

Why do motors buzz when are applied PWM?

Why do motors (DC) make a buzz sound when a low duty cycle PWM is applied to them? Once I applied a 10% duty cycle PWM to a gear motor and it didn't move. just made a buzz sound. What does a low duty ...
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1answer
67 views

What is the concept behind speed change in a constantly loaded DC series motor?

I have a problem regarding DC motors that I am trying to solve. I think that I might not understand the assumptions that are given. The question given is: A DC series motor is connected to a load. ...
0
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1answer
40 views

Determine unhampered natural frequency and motor constants from graph?

I can find zeta from the PO given in the graph but I don't know any rule relate wn with tp and I don't have value of the of ts and tr For part b and c I don't know where to start please help me ...
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2answers
44 views

Multiple brushes on a commutator

The motor I saw has 14 brushes spaced around a commutator that is about two feet in diameter, and is used to move a large antenna. What is the advantage of having so many brushes and is the commutator ...
0
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1answer
111 views

Why starting current in star-delta starter becomes 1/√3 times that of DOL starter?

I have seen this statement in a question paper. I was asked to prove it but I can not find the logic.
0
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0answers
42 views

Gate operator - how to tell if gate is open or shut?

I have just installed a LiftMaster model LA100 electric gate operator. I want to interface this gate with my existing phone and household control system, for the purpose of 1) operating the gate ...
0
votes
1answer
60 views

12V DC Motor Attachments

I have an Arduino that I am running two DC motors off of. I have the L298N motor shield that I am using to power the motors. Now that I have the system hooked up and running, I want to add the next ...
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1answer
41 views

Magnetic attraction/repulsion with motor/generator and similar systems?

With generators and motors, is there a form of magnetic attraction or repulsion between the conductive element(rotor/solenoid) and the magnet's magnetic fields? If so, what formula would be best to ...
-7
votes
1answer
65 views

What is a jumper? [closed]

I have solved the circle problem, but now have another. What is a jumper, and how should it be plugged into D7, D8, D9 and D10? I can't find them in the list of materials, I don't know what they look ...
0
votes
1answer
62 views

Motor Voltage known but nothing else

I`ve just got a 1.5-9V motor and I know nothing else. I'm using a 9V battery but I want to know how to change the resistance to slow it down but I have no ways of finding the current flowing through ...
0
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2answers
55 views

Motor Torque overload

I wants to understands possibility when torque overload occurs. Suppose motor is pulling up load A through pulley.Now if extra load B is added to trolley.Now there is difference between load torque ...
0
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1answer
48 views

Dealing with Motor Noise

Generally 0.1 μF 50 V ceramic capacitors are connected across the motor terminals to reduce noise. How this value is decided? Does it depend on the motor rating?
0
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1answer
55 views

Lorentz force opposing mechanical input to a generator?

When comparing between an electric motor, and a generator. I find them being quite similar. I can use and motor as a generator and vice versa. What's confusing is the principle, the Lorentz force ...
-1
votes
1answer
107 views

Best Electronics To Salvage Electromechanical Parts From [closed]

I know there have been 2 previous questions (From what used/junk equipment can I salvage solenoids from? and Taking apart old electronics) on this, but this one is a bit different. Also, questions ...
0
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0answers
44 views

Three Phase Permanent Magnet Rotor Generator Magnetization

I have a three phase permanent magnet rotor synchronous generator. The rotor was recently removed from the machine in order to repair the shaft. The motor when when run at the same speed does not ...
1
vote
1answer
42 views

Induction Motor Power Problem

I have this textbook problem I am not sure how to go about doing it: A 3 phase, 460V, 60HZ, 20KW induction Machine draws 25A at a power factor of 0.9 lagging when connected to an equivalent power ...
0
votes
1answer
88 views

Is it possible to control a DC motor with Microstepping driver?

Today I found that electronics dealer have shipped me a Microstepping controller (A4988 -module: http://www.robotshop.com/media/files/PDF/datasheet-1182.pdf -on-board chip: ...
-3
votes
1answer
58 views

how can revolve this object?

This object is for revolving glass stationary for art works. Like the mirror revolving left and right 90' degrees periodically with motor and arduino. But today I heard that this servo motor can't ...
0
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1answer
41 views

How to connect absolute encoder on the rotating shaft. Please see the three options?

Hi, Here I have added 2 options for connecting encoder on shaft. Motor, gearhead and shaft is connected using coupling. But where will be best place for encoder (To avoid backlash from coupling ...
2
votes
1answer
140 views

MOSFET Driver Stress

I am using an Allegro Microsystems A4935 3-phase MOSFET driver in a brushless speed controller. I recently got the motor spinning, but when I began increasing the voltage, my commutation started to ...
0
votes
1answer
51 views

driving a synchronous motor as a generator

Say I have a 100 kW synchronous motor in a building driving a pump/fan etc as part of an HVAC system. 1 - if I drive the shaft of the motor at 100 KW (from somewhere else), then the load on the ...
3
votes
1answer
109 views

Best choice between flyback diode or an RC snubber

I have a motor that has a 24 Vdc (15 ohm) brake attached that tends to weld / burn up the contacts in the ice cube relay that controls it after a year or so. I was wanting to put some protection on ...
-1
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4answers
126 views

Building a PWM circuit to control a 90v DC motor at 20amps. Will this work?

Sharing the load among 4 transistors with ballast resistors -
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votes
2answers
60 views

Can Average Power of a 3-Phase AC motor be calculated from Mean Current & Voltage RMS from each winding?

If this is possible could a formula be provided. + Explaination. Thanks very much in advance. FYI I am completely new to this site so please be kind. Could I ask that any criticism be constructive. ...
3
votes
1answer
89 views

Capacitor Powered Vehicle Project

I'm working on a project to design and build a 1/10th scaled ultra-capacitor powered electric car. I'm a Mechanical Engineer & I really want to focus on the the building and testing of the vehicle ...
1
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1answer
103 views

Spark in blender motor [closed]

I was trying to repair a blender whose speed buttons were not working. I thought of removing the speed regulating circuit altogether and directly connect power to the motor. Now, when I run the motor ...
4
votes
3answers
243 views

Breadboard Resistor/Motor Not working

I'm pretty new to 'breadboard-ing' and I'm beginning to work with and need help understanding some basic concepts that I can't grasp. Basically I've made a basic circuit with a push button for an LED ...
1
vote
1answer
39 views

How to wire a switch to change the speed of a motor?

I wanted to create a switch mechanism, using a three position switch that would allow me to change the speed of the motor in the picture. I know that the motor's speed can be changed by switching the ...