An electrical actuator converting electrical energy into rotational motion.

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1answer
140 views

Upgrade a cordless screwdriver (16.8 V) to Li-Poly [closed]

I'd like to upgrade my cordless screwdriver/drill to use lithium polymer batteries. Problem is, the screwdriver uses 16.8 V at the moment (14 NiMh 1.2 V cells). So, using lithium polymer batteries ...
1
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4answers
135 views

Increasing voltage to motors

I'm got a RC car, which can go forward and backward and it's supplied by ~5V battery. At this moment the circuit looks like this: and the board can swap ...
4
votes
4answers
225 views

Control torque of 3-phase AC motors

Actually, we have 1x30HP, 2x10HP motors working at our workplace. When we start the motors there is a lot of torque generated due to which our grid supply charges us penalty every month. We need ...
0
votes
1answer
117 views

Small Vibrating Motor at Set Intervals

I am looking to create a simple circuit that utilizes a very small vibrating motor such as the one here: http://www.adafruit.com/products/1201#Distributors. I would like the small motor to be powered ...
5
votes
2answers
154 views

Automatic swinger from spare CD drive

An idea that comes to my mind to swing a baby swing automatically is using a CD drive eject - close function , I have several such drives I dont use and I dont want to use a computer to do the ...
0
votes
2answers
86 views

Solteam switch with 5 pins

I am very new to electronics, learning by my own. I extracted a lot of switches, buttons and other components from old computer parts, and now I am wondering can I use this as direction switch for ...
0
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0answers
62 views

Capacitor motor vs. three phase motor

I successfully converted a small (~15W) capacitor driven one phase synchronous motor to a three phase motor by removing the capacitor and connecting the two windings to a three phase motor frequency ...
1
vote
1answer
50 views

DC gearhead motor broken - too much heat on terminals while soldering?

I am building a line-following robot using two of these motors: Motors I had everything on the breadboard and it worked fine - including both motors. Then I built the circuit, soldered wires to the ...
1
vote
2answers
273 views

High Current DC Motor Driver

I have seen this datasheet of high current DC motor Driver. Its mentioned that it can be used to drive the motor in forward or reverse direction. I puzzled by seeing only 2 X IR7843 MOSFET's are being ...
3
votes
3answers
702 views

Limiting current for a DC motor

I've been searching around the internet on and off now for over a month and now, and I fear my question is so basic that I can't find an answer. Or I've seen the answer and just recognize it. All I ...
1
vote
3answers
130 views

555 Timer Triggering Too Easily

I've got a 555 timer being powered by a 5v rail that is isolated from the 3v rail running a motor driver, which runs a motor. The 555 is only supposed to fire when it gets the signal from a 38khz ...
2
votes
1answer
165 views

H-Bridge motor with Arduino

I'm pretty new in electronic stuffs and I'm still not sure what I'm doing, so my questions might seems retarded. I recently got an Arduino and I'm trying to build a mini-car with it, but I would like ...
1
vote
0answers
159 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
2answers
207 views

Calculator Printer Control (how to drive Epson dot matrix printer)

I have small dot matrix printing device that I'm trying to control (i.e. print to) with a Parallax Propeller board. (See images below.) It's the printer from this: ...
0
votes
1answer
266 views

wiring a blender motor

So I've salvaged a motor from a blender that was not in use- the only thing is I haven't got a clue how I would wire it. I want to make sure I have the correct setup, since it operates at 230V. So my ...
4
votes
2answers
192 views

Can someone tell me what these two lines of Arduino code do?

I'm trying to get into robotics, and I've found some tutorial code that was readily available on pololu's website for one of their motor controllers which I now own. Could someone with some background ...
4
votes
2answers
568 views

Trouble on switching a 3V relay with Arduino digital pins

I am using the Arduino Ethernet with POE and I am in trouble when I have to enable my relay by using a digital pin. What I would like to make is to start a motor by using a relay, which relay is ...
2
votes
1answer
162 views

How to interpret diode-mode readings from a multimeter

I'm using this multimeter to examine a heat gun fan. The fan has four contacts placed in a circle (well in a square inside a circle). Two opposite each other are labeled ...
0
votes
2answers
296 views

How to fix servo motor broken by wrong polarity [closed]

I accidentally plugged in my servo with the wrong polarity (with the order of wires being signal, ground and power). It immediately started releasing the 'magic smoke', but I managed to unplug it ...
2
votes
2answers
573 views

I need help designing a speed control dc motor circuit

We were asked to design a motor speed control circuit using A 15V Source -> Potentiometer ->LPF-> Op-Amp -> ADC ->DAC ->Op-Amp-> Motor Driver -> 3V DC Motor (because of its low cost) I am going to ...
0
votes
0answers
83 views

Frequency Inverter LS IS5

I have been working with a IS5 frequency inverter. I'm trying to use the Sensorless Torque control, for a Wind Turbine Emulator, via an external reference. The issue is, when I turn the inverter on ...
3
votes
2answers
294 views

Why did the designer use this motor?

I was taking apart this thing that I bought from the dollar store, its this glass block with an encased sculpture that sits on a revolving deck. (see photo below) The deck powers 4 LEDS with ...
0
votes
2answers
104 views

Should I supply a motor with the same current of its stall speed?

I have a DC motor that has a stall speed current of 6 amps. Does that mean I should be supplying a constant current of 6 amps even when the motor is not experiencing a need for that much current?
2
votes
2answers
2k 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 ...
2
votes
2answers
145 views

Motor activation using MOSFET

I need to switch a motor on and off by cutting it's battery connection and even though I could use a relay, I would rather to use a MOSFET, so things will be smaller and quieter. The problem is, I am ...
4
votes
1answer
183 views

How do two DC motors of the same power but for different voltages differ in size?

Suppose I have two brushed DC motors, each rated 3000 RPM and 50 watts. One is rated for 18 volts and the other for 36 volts. How will their sizes differ? I assume that because of higher voltage the ...
8
votes
2answers
1k views

Difference between Brushless Motor and Stepper Motor

I think I understand the operating principles of a brushless motor and a stepper motor, but I'm a little confused about the difference. Is a brushless DC motor a very basic stepper motor? With ...
1
vote
1answer
171 views

How to identify stepper motors?

I have a bunch of motors that I collected from different places. How can I figure out which ones are stepper motors? I have access to the datasheet for most of them, just not sure what to look for. ...
3
votes
3answers
634 views

DC Motor - PWM vs Voltage

When controlling a DC motor that is rated at 5V theoretically I can drive the motor in these ways: 5V with 100% duty cycle PWM. 10V with 50% duty cycle PWM. 20V with 25% duty cycle PWM. Is there a ...
6
votes
2answers
520 views

Why would DC motors be preferred over brushless AC induction motors for cable cars propulsion?

According to this article San Francisco cable cars system uses a set of traction cables driven at constant speed and each car can connect to the cable when its operator want the car to move and ...
3
votes
1answer
59 views

circuit breaker for 1/4 HP 115V AC motor?

I'm building a machine to help me manufacture some optical components more quickly. The machine will be powered by a plain old, "boring" 1/4 HP motor, like the ones used for various household ...
4
votes
2answers
198 views

Is no-load to stall amp draw linear with DC motors?

I have two DC motors with no-load current draw of 200mA. The datasheet goes on include a stall-current draw of 2.2A. The torque is given for both extremes. Considering you know the torque that is ...
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votes
2answers
246 views

Diffrance between Brushed ESC and Brushed DC Motor Driver (Controller)

What is the diffrance between a Brushed ESC (electronic speed controller) and a Brushed DC Motor Driver (controller)? they both do the same job, yet at different prices and look diffrent. Example: ...
0
votes
1answer
422 views

to automate motor switching on and off

I want to automate my motor so that it gets automatically switched OFF when my tank reaches the full load level.So I chose a sensor to be kept at the tank's maximum position... then a MCB connected to ...
2
votes
5answers
176 views

Is a solenoid considered a DC Motor?

For our senior project we are making an electronic door lock controlled by a raspberry pi. We created a proposal which was approved for all the specs for creating the device which we have to abide by. ...
2
votes
2answers
374 views

Modify circuit to turn motor on/off multiple times per switch press

I purchased a timed air freshener kit which makes the motor spin when the switch (SW1) is pressed. I have created a schematic based on the diagram in the instructions (pdf). simulate this ...
1
vote
1answer
144 views

control four motors with Motor Driver 1A Dual TB6612FNG

I know I can control 2 brushed DC motors bidrectionally with the Motor Driver 1A Dual TB6612FNG, but can I somehow control 4 brushed DC motors with the Motor Driver 1A Dual TB6612FNG, NOT ...
4
votes
2answers
457 views

1 Regulator for 4 motors or 4 regulators?, connecting 3-5V dc motor to arduino

I have a 2S Li-Po battery (7.4v) and I want to control 4 small dc motors (3-5V, site says 22mA at 3V) with an arduino nano PWM signal. The nano is also powered by that battery, i do not want another ...
2
votes
2answers
254 views

Electric engine power over RPM

I have started to research about electrical motors and batteries. I have learned physics in high school and I understand electricity. My question is whether an engine's power depends on its RPM or ...
0
votes
1answer
359 views

24V H-Bridge DC motor, why voltage drop to 3v if motor connected

I want to drive a DC motor using L298N H-Bridge Driver IC. I'm using the schematic from this website: The motor is 24 V with about 7.5 ohm impedance (thus, it draws about 3.2 A). I'm using 24V ...
6
votes
2answers
231 views

Why did my laser die?

I recently hooked up a cheap laser module to a mircrocontroller (via a MOSFET), mounted on top of a couple servos. simulate this circuit – Schematic created using CircuitLab This worked ...
1
vote
4answers
486 views

Transistor circuit to toggle motor on/off not working (Arduino)

I've been trying to create a simple transistor circuit with a 2N3904 that will toggle a geared DC motor on and off without drawing power from the arduino - I've followed the schematic seen in the 2nd ...
3
votes
2answers
117 views

motor feedback system for linear motion

What is the best way to detect the position / displacement of a linear motor ( solenoid type ) for feedback ? I was thinking of using a hall effect sensor or an Infrared sensor .
0
votes
1answer
231 views

What type of pumps are most energy efficient to lift 200 liters of water over 15 feet?

Trying to design a rain-water harvesting system for our home. A long-term goal for me is to go "off-grid", or reduce dependency on grid-power, as much as possible. My need is to evacuate about 200 ...
1
vote
2answers
437 views

2 color LED short circuit my board

I have a 2-color LED (3 pin out: one common, and one for each color). I have a DC motor running on two AA batteries. Both color LEDs are OK while testing on a battery pack. Now what I need is the ...
1
vote
0answers
177 views

Making a controllable H-bridge

UPDATE I found out the issue. Specifically, the PNP transistor I got. I used a BC557 - for some reason its collector-emitter current is very very low. It does open when the base-emitter junction goes ...
3
votes
2answers
373 views

General 3 Phase Motor Inductance Question

I know that motors are inductive loads. Does the inductance of a 3 phase motor depend on the load on the motor?
4
votes
1answer
282 views

Can a constant-current stepper driver be coerced to act like a constant-voltage driver?

I have a strict requirement1 to drive a stepper motor with an L/R (Constant Voltage) driver but the problem is, nobody seems to commercially make these anymore due to their inefficiencies compared to ...
3
votes
2answers
1k views

L297 stepper motor driver inhibit issue

I've knocked together a L297/L298 stepper motor controller and have a problem with what seems to be half the output. On the final 4 output lines after the L298 and diodes, I have 2 bipolar LEDs to ...
2
votes
3answers
699 views

What is good device for generating vibrations, offset weight motor or solenoid or some other?

I am building a vibrating device for that I am thinking to use a solenoid for vibration. The solenoid will be used such that device will be mounted in the floor and when a stick is put over solenoid, ...