An electrical actuator converting electrical energy into rotational motion.

learn more… | top users | synonyms

0
votes
2answers
48 views

Connect a bipolar stepper motor to a breadboard

I would like to connect a bipolar stepper motor, with a connector as the one in the picture, to a breadboard. Is there any adapter I can use?
0
votes
2answers
74 views

Sharing same battery with two dc motors and two servos

I have a 12v battery powering two DC motors through an Arduino and motor controller. The 12v battery is also powering the Arduino using the VIN pin. Now I am trying to hook up two servo motors from ...
7
votes
2answers
661 views

Controlling a very small DC motor with PWM?

I have a very small DC motor (from a Walkman), I would like to control the speed from a micro-controller. For that I would like to connect a MOSFET in series and apply a PWM signal to its gate in ...
0
votes
2answers
144 views

How much weight can a motor take before it can't run? [closed]

I bought these 50:1 gear motors for a project robot I'm building for this YouTube walkthrough series with a couple of Arduino's, two other servo motors, a motor controller and various hardware. The ...
1
vote
1answer
93 views

How to get my internal Harddrive to spin externally?

I have a Seagate ST3500620AS Harddrive that's just laying around and not being used. I want to power the motor at full speed (rated to run at 7200rpm) and do some hobby projects with it. Problem is, ...
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 ...
0
votes
1answer
68 views

Car window motor control output

I'm toying around with a car window, and used this tutorial to try and make it work: https://itp.nyu.edu/physcomp/labs/motors-and-transistors/dc-motor-control-using-an-h-bridge/ I've set it up almost ...
0
votes
1answer
40 views

I need help understanding how this stepper motor circuit works

This is my first time working with stepper motors. The motor in question is a Portescap 55M048D1B (source: http://www.digikey.com/product-detail/en/55M048D1B/403-1016-ND/417823). I am having trouble ...
0
votes
1answer
57 views

Synchronous motor base speed calculation

I would like to ask the following question. How can I calculate the base speed of a Synchronous motor for variable speed applications controlled in dq frame? I want to calculate the base speed for ...
1
vote
1answer
49 views

Circuitry for the DRV8840 Motor Driver

I'm building a circuit based on the DRV8840 (datasheet: http://www.ti.com/lit/ds/symlink/drv8840.pdf). Unfortunately, I can't get it to work. I think something might be wrong with my design. When I ...
-5
votes
0answers
51 views

how to make 30 seconds timer [closed]

I'm trying to make a timer, that powers the small motor for 1-2 seconds, every 30 seconds. I need this to be portable. Can someone help me? the motor I have is using 3 V voltage, also I don't want ...
-2
votes
1answer
55 views

How to controlle a motor with arduino

I have 2 og those 12v motor and a 12v battery http://www.enigmaindustries.com/Motors/Bosch_EV_Warrior.htm I want to know what s the best solution to controle the motor with an arduino Uno. Is the ...
0
votes
2answers
65 views

How do I reduce the Counter EMF?

I hope I can explain what I am asking. We will connect a DC motor to a single phase rectifier. Motor will carry a load. And motor sould be able to spin right and left. And when it is changing its ...
-4
votes
3answers
66 views

What could be the voltage of this common DC motor? [closed]

Below is the picture of a common DC motor usually used in electronic toys. This motor is quite common so I guess someone may be knowing it's voltage and how much current it draws. I could've tested it ...
2
votes
1answer
58 views

Estimating power usage of idle motor

I would like to calculate the power usage of an idle motor. The motor drives state a power usage of approx 8-10% of full load. Would it simply be the case of taking 8-10% of the motor's power rating ...
0
votes
2answers
150 views

Identifying windings of a single phase induction motor

How can I identify the main and auxiliary windings of a single phase induction motor which has only three terminals (1.Red, 2. Yellow & 3. Black) out of the device? How to connect capacitor and ...
0
votes
1answer
81 views

DC Motor circuit polarised 2 directions switches

I'm totally new to electronicS and do not understand a lot and I've read other posts but people seem to be asking different things to me so apologies in advance if this has been covered but I've typed ...
1
vote
1answer
48 views

AC Machine Stator Winding

In designing a 3 Phase, 4 Pole, 24 Slot AC machine assuming a RYB phase sequence i am confused on the starting point of the blue phase. The calculations, table and diagram look like the following. ...
0
votes
0answers
23 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
1answer
54 views

Can rated stator voltage frequency be exceeded safely in an induction motor?

The following induction motor at the link has rated 50Hz stator freq. on namespace label: http://www.vanbodegraven.nl/en/products/ac-motors/asea-mbg-200-m-60-6/ It seems it is 6 pole since it has ...
0
votes
2answers
55 views

Why does an induction motor not have the maximum torque when it is locked?

In theory the maximum current induced at rotor must be when the rotor is locked hence the force is B.I.L it must produce the max torque. But why torque is not maximum when it is locked but it is ...
0
votes
1answer
54 views

Changing Motor Gearboxes to Reduce Current

I am currently using two 12V CIM Motor (Spec Sheet: http://content.vexrobotics.com/docs/217-2000-CIM-motor-specs.pdf) with a gearbox at a 49:1 ratio. I have a LiFePO4 battery that is rated at a ...
0
votes
1answer
41 views

How is speed torque curve of an induction motor plotted experimentally?

I'm wondering how is obtained a 3-phase induction motor's speed-torque curve obtained. I couldnt find any procedure. Are they first applying fixed voltages with fixed freq. to stators. and then ...
2
votes
1answer
67 views

How can I make an accurate torque/RPM curfer for the random electric motors lying around my garage?

I am blessed with a garage filled to the brim with all sorts of electric motors, most of them sourced from broken household appliances and the like. I would like to gather some data about them, like ...
0
votes
0answers
53 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
1answer
30 views

Calculating different rated power from the rated parameters for a delta AC motor

A delta connected motor in the following link: http://www.vanbodegraven.nl/en/products/ac-motors/asea-mbg-200-m-60-6/ has rated current 47A, voltage 380V Here is the rated values. Cos(fi) = 0.8 on ...
0
votes
2answers
112 views

What is the relation between the stator current and motor rpm for an AC motor?

A 3 phase AC motor is rated values are: 970 rpm, 50Hz, 380V delta 47A. A VFD drives this motor for obtaining a constant wind-speed which rpm is proportional. The thing is when 885 rpm the stator ...
-1
votes
2answers
73 views

How to determine the pole number or synchronous speed of an AC motor from its rated RPM?

Trying to to determine the pole number or synchronous speed of the following AC motor from its rated RPM. Here are the details: http://www.vanbodegraven.nl/en/products/ac-motors/asea-mbg-200-m-60-6/ ...
0
votes
4answers
82 views

Is the hfe of a transistor dependent on the resistance on the other parts of the circuit?

I have a circuit using a NPN transistor with a motor before it and a pwm into the base. The motors draws a current of 600mA if I plug it directly into the power source, just under the maximum allowed ...
0
votes
1answer
87 views

Most efficient generator for charging 12 V batteries

I have a Honda GX25 mini 4-stroke engine that I want to built a battery charging generator for 12 V lead acid batteries. My first idea was to use an old car alternator as the generator part, but now ...
5
votes
1answer
501 views

how does the circuit of a basic Variable speed electric drill work?

i am trying to 'automate' the control of an electric drill motor that im taking from a garden variety Variable Speed drill (from Harbor Freight) it has a universal AC motor which I basically ...
-3
votes
2answers
122 views

Controlling a DC motor directly with Raspberry Pi GPIO without any external IC or Transistor

I need to control a DC motor without the use of an external IC or transistor with the raspberry pi GPIO. I do not need direction or speed control. All I need is the motor to controlled by raspberry pi ...
-1
votes
2answers
84 views

Clarke-Park transform for a 3 phase induction motor current

I am facing some problems in performing clarke-park transform for an induction motor(4 pole stator, squirrel cage IM). The motor is run with three sine wave inputs, 120 degrees phase shifted with each ...
1
vote
1answer
66 views

Testing an h-bridge using the power supply and/or signal generator to control a DC motor

I'm using the DRV8836 (datasheet here) from Texas Instruments and can't seem to get it to work. Does it require a PWM (pulse from the signal generator) or am I able to drive it with only the DC power ...
1
vote
1answer
43 views

Running a 4-DC motor Circuit

Currently I'm doing a project where I am simply trying to get a robot to move forward without code by using say a push button or a potentiometer. I plan on moving on to micro controller later, but ...
0
votes
0answers
60 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 ...
1
vote
1answer
325 views

Correct Wiring of 1 phase 220v Electrical Motor

I am trying to install a single phase 220v electric water pump. I am fairly certain that it is wired correctly however the water pressure it is pumping out is absolutely useless. I have attached how ...
-1
votes
1answer
41 views

Basic motor principles

If a tube shaped permanent magnet with circular magnetic field was introduced in to another external magnetic field, would a force act at right angles as it would a copper wire with DC voltage ...
-1
votes
1answer
50 views

I have buyed a 750 rpm torque 3kg.cm motor but i am not able to calculate the amount of torque and rpm avilable on 7cm tyre

This is the motor i buyed http://www.snapdeal.com/product/core-dc-helical-geared-motor/719331155 I am working on project for science fair but it has become too much confusion that how much weight ...
0
votes
0answers
14 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
1answer
66 views

High Voltage MOSFET Controller - Random Failure

I have a 120V DC Motor that I need to control the speed of. I am doing this through a High Voltage PNP transistor (MJW21193) rated at 250V and 16A with a peak of 30A as I understand it from the data ...
0
votes
2answers
127 views

Taking an unstable DC voltage, and stabilizing it

I have a DC motor generator (basically the motor spins, and it powers an LED at the moment), and the output current (mA range) and voltage is very unstable. For an entire circuit to run on the ...
0
votes
1answer
47 views

Stepper Motors : KG.CM Torque : Does it maintain the torque when connected to a rod?

I am currently building a machine for a school project.I have a pivot point and wish to use a stepper motor to turn the base at an angle. The base is carrying a load of approximately 10kg. I was ...
-3
votes
3answers
108 views

may i know what is wrong in this circuit?.. forward-reverse motor

what is wrong in this circuit this is a circuit for a forward-reverse motor.. what is wrong on this?? I made it on PCB board and it doesn't work!!
-1
votes
1answer
155 views

DC motor speed control: 12VDC 700mA fan motor powered by 7.2Ah sealed lead-acid battery

I am using a 7.2 Ampere-hour Sealed Lead Acid Battery to power a 12V DC motor which is driving a fan, and I need to understand ...
0
votes
1answer
66 views

Transistor based relay driver for DC motor is not working with 12V-8A DC motor?

I am trying to run a 12V-8A DC motor from pic microcontroller output pin via relays(28V-30A output rating). It only starts for a split second and stops. Where as small DC motor runs perfectly on the ...
-1
votes
1answer
82 views

How to reverse the direction of operation of the motor?

For Synchronous buck, half bridge converter, how to reverse the direction of operation of the motor? That would be great if you could explain me with the circuit diagram.
0
votes
0answers
38 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 ...
1
vote
3answers
113 views

D.C. motor works underwater?

I recently immersed a small, 10 volt D.C. motor underwater for experimentation purposes. When I turn on the power, always to the same power level, it SOMETIMES spins effortlessly, and other times it ...
0
votes
2answers
144 views

Many small and cheap linear actuators [closed]

Me and my friends are trying to build a linear actuator matrix. It's supposed to be a grid of pins that go up and down at reasonably fast speed (more than 1cm/s, the faster the better). Problem is, ...