An electrical actuator converting electrical energy into rotational motion.

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2
votes
2answers
36 views

Interference from motors on PWM signal

Am building myself a robot chasis that is RC controlled. There is an RC receiver attached in solution and I have a remote RC transmitter. When the motors are not running, I get a perfectly clean ...
-4
votes
0answers
30 views

Cheap High Torque Motor [on hold]

I'm looking for a motor (brushed/stepper/stepper)(not brushless)(probably geared) that has at least 30 kg/cm of torque, less than 15 USD (I have to buy 34), less than 100 grams, and at least 60 RPM ...
0
votes
0answers
28 views

How to chose the lightest battery [on hold]

I need to power up the following motor & ESC: A2212/13T 1000KV & Xinte 30 A ESC (11.1V Lipo). How do I calculate the minimum battery specifications required to do it?
4
votes
1answer
55 views

Unknown resistive disk in parallel with AC motor capacitor

This assembly is the motor connector for a Grundfos U15-38SPA circulating pump, which interfaces to the capacitor (2uF) and power supply (220VAC). Between the two brown wires leading to the cap is ...
0
votes
1answer
20 views

change polarity of washing machine motor [on hold]

Apologies if this has been asked before but using the subject as a search query, I did not see any relevant results. I have an LG WD-10485TP front loading washing machine with a problem where the ...
0
votes
2answers
46 views

Parallel motors on the same output

Am I getting motors correct? I'm building a third party psu for a slot car race track. Obviously easy bit is transforming 240Vac down to 12Vdc. But I am unsure how thiswill react with my motor. THe ...
0
votes
3answers
136 views

Why can't I vary the speed of a dc motor with only a potentiometer?

I made a simple circuit with a 9 volt battery, a dc motor, and a potentiometer. The positive of the battery is connected to one side of the potentiometer and the negative to the other. One side of the ...
-2
votes
1answer
37 views

Speed and direction control of motor by using IR & 555 on Proteus. (Circuit with errors is attached.)

I am trying to control motor direction & speed by using IR and 555 on Proteus. Circuit and errors images are attached. Please help me solving this quagmire.
8
votes
2answers
5k 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 ...
1
vote
2answers
52 views

DC Motor Speed Control Board

I have a 120VAC DC motor speed controller (diagram attached as picture) it works very well, however in the circuit there is a 5000K POTENTIOMETER that controls the actual speed/voltage - The ...
1
vote
2answers
326 views

How to prevent DC motor from dropping voltage of supply when switching on

I have a circuit which uses an ATtiny85 output to a transistor (S9013), which will trigger a relay that controls a motor. The reason for the transistor to relay is because I do not have a transistor ...
0
votes
0answers
27 views

Hacking a self balancing scooter wheel/motor

The wheels/motors of self balancing scooters seem to offer great opportunities to hobby robotics. The motor is completely housed inside the wheels, the motor seems powerful & are pretty cheap ...
0
votes
1answer
55 views

Behavior of power supply and DC motor for voltage/current combinations?

Are the below statements correct? Marked in Bold and Italic are my doubts! Unregulated power supply (Battery?) If supply current rating > motor current rating --> No problem since motor pulls only ...
0
votes
1answer
110 views

Controlling a single phase AC fan with a 0-10V DC input

I have a fan motor which is a permanent split phase single phase capacitor motor: http://uk.rs-online.com/web/p/axial-fans/2781543/ I currently control this fan's speed with the following ...
-1
votes
0answers
43 views

Simple Electric Motor [closed]

I want to make a really efficient but simple brushless motor by using a magnet, ferrite core, and coil. What are the formulas I would need to calculate the force/ power of the magnets and coils? ...
-3
votes
0answers
43 views

How to drive a dc motor with the help of microprocessor? [closed]

how can I drive a dc motor or control its speed with the help of a microprocessor? should I use ADC(analog to digital converter)? how to connect the LED's and how I use the control word? which ...
0
votes
1answer
28 views

Questions about a relay controlled AC fan setup

I need to switch an AC fan by a DAQ board's analog output. Here is the setup in my mind for the moment: The DAC of the data-acquisiton board can output 0 to 10V DC and can deliver max 5mA current. ...
0
votes
0answers
35 views

Convert motor speed to motor torque [closed]

I have motor speed as input in my math equations I want to convert them into torque because i want to control the torque not the speed There is any relation can help me use torque instead of speed? is ...
1
vote
3answers
54 views

How can I tell if a serial connection is sending bytes okay?

I have a Teensy connected to a Pololu motor controller. If I send bytes over USB (using Pololu Serial Transmitter v1.3) I can get it to work (For instance, 0x85 0x00 0x20 makes the motor run at slow ...
-5
votes
0answers
37 views

Increase Motor Speed By low Voltage (AC) [closed]

i want ask question How i can increase motor speed AC not DC ? IF i set arm from this arrange motor , gar , arm . this arm will increase this speed . if yes what is relations with it and speed ...
0
votes
3answers
42 views

AC motor control

I have a simple AC motor, a pump. There is no kind of regulator in terms of speed or pressure. Its supply is 230 Vac, 50 Hz. If I decide to lower its supply voltage, what happens? it will require ...
1
vote
2answers
44 views

Permanent magnet DC motor earth wire

I have just inherited a piece of equipment that is powered by a 12V DC permanent magnet motor. My hope is to drive it using an Arduino PWM and a H-Bridge to manage the current requirements (7.3A ...
0
votes
1answer
31 views

Brushed Dc Motor to Reluctance Motor

Brushed DC Electric Motor Use Brush to Energize Rotor's Pole at such an angle with respect to Stator Pole that it constantly runs, once applied dc power. Can same be achieved for reluctance motor, ...
5
votes
2answers
1k views

Why are the letters U, V and W used in AC motors to represent the windings?

I am connecting up an AC motor and was wondering if this labeling system was representative of something? Or just another set of letter like X,Y,Z? I could not find any information regarding this in ...
6
votes
3answers
5k 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 ...
-7
votes
6answers
406 views

One motor connected to 4 generators or alternators - why would it not produce more electricity than it consumes?

OK so here is something I have been curious about. Let's say we connect a single electric motor (driven by e.g. an automobile battery) to 4 different generators (or alternators). Would it be ...
6
votes
3answers
2k views

Voltage spikes when driving DC motor with N-channel MOSFET

I'm trying to drive a DC motor (12V, 100W) with MOSFET IRFP054N. PWM frequency is 25 kHz. Here's the schematic: I know DSEI120-12A is not the best diode for this but I don't have any better right ...
0
votes
1answer
30 views

High Torque DC Motor

I am trying to use a high torque dc motor with gears to drive a low torque dc motor but with higher rpm. Is there a relationship between the current draw of a DC motor with the torque? I have seen a ...
0
votes
2answers
49 views

What kind of DC motor is this and what does the circuit do?

I've had this motor at least for 5 years (salvaged from something) and I remember it working then. However it doesn't work now (5 VDC mobile charger) and so I opened it up expecting to see just the ...
0
votes
1answer
96 views

Does a motor really need all this circuit to run?

This is the pcb of an Ikea screwdriver, you can see I desoldered the 18650 battery, from B+ and B-, and desoldered the motor from the legs of the switch which is on the other side. So the circuit ...
-1
votes
2answers
82 views

Transistor to switch a motor not working - what's wrong?

I've been working on a project and cannot seem to get it right. I'm using an arduino to control a motor, and turning it on and off via a transistor. I had an issue with it not working, so I posted ...
3
votes
3answers
55 views

Motor Induction motor design specifics

I wanted to know the difference between the motor(s) used in the Tesla Model-S and commercially available motors. eBay Motor^ I have been very confused. They both are approximately the same size ...
26
votes
1answer
24k views

How can I implement regenerative braking of a DC motor?

I know that many electric cars are able to convert the momentum of the car into stored energy in batteries, rather than convert it to useless heat at the brake pads. How does this work? How can I ...
3
votes
4answers
2k views

Stacking batteries to get 200 volts and 21 amperes

I need to run an old DC motor that needs 200 V DC, 21 A full load; total 4200 W. I want to see if I can run it on V mount lithium batteries made for cameras. Each battery has: A ...
0
votes
4answers
133 views

How do I get a position from an encoder?

I have a motor that drives a rail which I need to know the position of. I have an AM102 encoder attached to the motor. But am unsure how to get a position from it. I have powered it up and attached ...
1
vote
2answers
54 views

What is the purpose of these extra 'level shifter' BJTs on a MOSFET H-Bridge?

I am working on a 2WD Arduino project. Making the H-Bridge myself, and not using an IC like the L293 is a requirement for my project. After searching a while, I came across this, and based on this I ...
0
votes
0answers
29 views

Explain please this half bridge circuit by ChaN

I'm analyzing ChaN's passive stroboscope project and have some troubles in understanding the motor bridge circuit: Here the full circuit. I don't understand why need C3, D3 (both), D4, and L2. And ...
0
votes
1answer
52 views

Constant RPM Low Speed Motor drive [closed]

What is the best way to drive a motor (DC/Brushless/Stepper) at a constant, yet low RPM? It must have no jitter and no drift over time. I'm aware that some gearing will be required. Basically what ...
3
votes
5answers
269 views

How to avoid damaging relay used for controlling motors?

I've got a circuit with two DPDT relays controlling a motor - the diagram below is borrowed from a related but different question. RLY1 turns everything on and off, RLY2 switches the direction of the ...
0
votes
0answers
32 views

What type of motor is it that I am after?

I would like to actuate a linkage using a motor from one end. Meanwhile, this linkage can be manually actuated from the other end. I would like to use a 12V motor which I can use to actuate the ...
0
votes
2answers
499 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 ...
10
votes
4answers
2k views

Is it valid to consider back-EMF in a DC motor equivalent to increased inductance?

I know that back-EMF can be considered as a voltage source in series with the motor which is proportional to speed. This is the common understanding, and I totally get it. Before I understood this, I ...
-1
votes
1answer
34 views

specific driver and motor combination

I am planning to make a 3D printer for a school project and would be grateful for your help. I want to combine the following driver [L298N Dual H Bridge DC Motor Driver IC; Driven part of the terminal ...
1
vote
1answer
89 views

variable frequency three phase AC

I want to generate 1-150Hz+ three phase AC. Output voltage at maximum frequency would be around 240VAC and current around 40A. I have a few 60Hz three phase induction motors, drive shaft coupler, and ...
5
votes
3answers
31k views

Understanding motor constants Kt and Kemf for comparing brushless DC motors

So for a practical definition, the torque constant Kt specifies how many Nm of torque you'll get from the motor at a certain current? Is a bigger Kt always better? I am more confused about the ...
0
votes
0answers
24 views

Piezomotor control

I'm trying to control a piezomotor, here is his datasheet, and drive it with the TMC261, however I've read that a piezomotor requires a sinusoidal wave so an DAC in indispensable but also I've found ...
0
votes
1answer
41 views

Electrical Braking: Why does voltage decrease with a decreased rheostatic load?

So I've been messing around with DC motors and electrical braking. BY placing a variable resistor across the motor terminals of the motor I've been able to vary the braking effect and observe the ...
1
vote
1answer
69 views

driving motor DC 24V with MOSFET

this is the basic shematic, i added a freewheel diode with the connector of the motor . Im driving a DC motor 24DC 1A, im using PWM 500Hz from microcontroller and MOSFET IRF740 with a driver TLP250 ...
1
vote
1answer
25 views

reducing input voltage to motor

I have a hypothetical question about running a DC motor on lower voltage than it is designed for. Lets say I have a 2hp 100VDC (yes, Direct Current) motor that I want run on 12 VDC. The motor is 2hp ...
1
vote
1answer
40 views

Acceleration time of unloaded motor

I want to use a motor to generate musical tones by spinning a disk. The disk will have optically printed sound waves on it. I would like to know how fast the motor will be able to change speed from ...