An electrical actuator converting electrical energy into rotational motion.

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14
votes
7answers
98k views

How are current and voltage related to torque and speed of a brushless motor?

I know that electric vehicles have different performances depending on battery and motor, but it's not clear how electrical and mechanical units are related. Can anybody please help? Will a 100V ...
0
votes
1answer
38 views

What causes servos to get damaged from high voltage?

I have 6 volt continuous servos. I needed to run them, but had no 6 volt power source nearby so I tried using a 9 volt 280mah rechargeable battery. The motor made weird sounds, but didn't work? I ...
0
votes
3answers
42 views

Trying to make an AC 3 phase motor run as smooth as possible at low speeds.

Is there a benefit in smoothness of rotation by increasing the outer rotor magnetic poles? Is there a rule of thumb for a 24 slot core vs number of magnetic poles?
3
votes
4answers
97 views

Methods for converting PWM to +/- 10v Signal

Suppose we have a PWM signal which controls the speed of a motor and a digital pin which specifies which direction a motor is travelling in, how can we convert these signals into 1 +/- 10V signal ...
1
vote
3answers
10k views

How to change rotation direction of 3-phase electrical machines?

I was taught that if you want to change the direction of a three phase rotating machine that is rotating in forward direction, you interchange the phases. Since the phases has the same features ...
0
votes
2answers
62 views

What does a motor driver do?

EDIT: I understand now, but with a microcontroller, why can't I just connect the data pin of the microcontroller to the data pin on the servo and the power form a battery bank to the power on the ...
0
votes
2answers
125 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 ...
2
votes
3answers
563 views

Can an electric motor create torque in a direction opposite to the current axle's spin?

Let's imagine a wheel spinning clockwise. There's an electric motor on the axle, and we want to spin the wheel counterclockwise. Can we just switch on the motor and it will work? I want it to slow ...
0
votes
0answers
11 views

Controll Motor-DC using PWM in Proteus and MikroC for PIC

I am beginner (10 days) in Proteus and Mikroc, but i prefer to learn and this is the reason for my post. I build a project using PIC16F917 and Motor-DC with L298 driver. I command motor to start ...
1
vote
4answers
66 views

DC motor causing noise on the power line

I've been building a circuit where I'm controlling a motor using a bluetooth module + phone. I've been having some problems, which mostly are fixed (see topic: previous topic). The main problem I'm ...
1
vote
4answers
255 views

What type of motor should be used to handle a static torque (blocked shaft)?

For the purpose of DIY robotics, I would like to have an electric motor, which is best for providing torque while not rotating. I imagine my robot will maintain a static balanced torque while ...
2
votes
2answers
63 views

3.3V input to 5V output for motor control

I wanted to connect my DC motor to raspberry PI and control it with PWM pin. Problem is that gpio pins are 3.3V in PI and I have pololu 10:1 DC motor which I would like to run on 5V(to make it ...
0
votes
2answers
67 views

From PWM Output to Large Motor Control

This question stems from my own curiosity, so forgive any vagueness. Imagine the following scenario: We have a MCU which outputs a PWM signal to control a motor's speed and direction. We ultimately ...
2
votes
3answers
20k views

Relationship between frequency and current

Hello I have a simple question, I was reading in my Airplane Maintence book that in AC motors are frequency sensitive (I understand that) frequency changes can cause speed changes of the armature. ...
0
votes
3answers
59 views

Converting a 120V universal motor to run on 240V

Is it as simple as rewinding the field coils with twice the number of turns and wire half the cross-sectional area of the original? or would the armature coils also need to be rewound as well? The ...
0
votes
1answer
36 views

Electric motors with both stater and rotor as electromagnets [on hold]

I am totally new to the Electrical area. I wanted to do a project on Electric car which needs an Electric motor which is highly powerful and efficient. Are there any motors which have both stater and ...
0
votes
3answers
67 views

Mosfet motor problems with bluetooth module

I'm playing around with a bluetooth module and want to control a motor using the module and a phone. I manage to control a small motor (±30 mA), but as soon as I'm connecting a bigger motor I'm ...
0
votes
1answer
62 views

How to use arduino nano to switch an 230V AC motor on/off?

I want to switch on and off an 230V AC motor with a relay what is controlled by an arduino nano. The on time and off time would be able to set by a 3-position slider switch. So would be 3 different ...
-1
votes
2answers
60 views

DC motor vs Stepper motor vs Continuous servo - Which one should I use? [closed]

I'm about to build a robot arm (trust me, I've already got most of it down), but I don't know which type of motor to use. From what I understand, DC motors do the same thing as Stepper motors but ...
-1
votes
1answer
39 views

Stepper motor driver board

Hi I'm planning to make a motor driving circuit on a perfboard. I'm new to electronics so please bear with me. In the past I've wired up stepper motors and run them correctly using microcontrollers. ...
-2
votes
1answer
58 views

Modification of a 3 phase AC motor [on hold]

There is a permanent-magnet synchronous motor with an external rotor that I want to explore and possibly modify. To do this I need some answers to my simple question: For a given shape of stator ...
3
votes
2answers
65 views

Small DC motor Heating up!

I am just trying to build a small fan to keep my Mac a little cooler from outside. So I have this little Box Design I made. Now, I'm a total noob at this thing so I need beginner level help here. I've ...
-1
votes
0answers
48 views

I'm building a prototype and need to power 2 12 volt motors [closed]

I'm building a prototype and need to power 2 12 volt motors. Given the power source will be hidden within the prototype Im looking to use 4 18650 batteries in series. One - Will this work? Two - how ...
1
vote
0answers
55 views

Using a fruit or salt-water battery to power a motor

I´m trying to build a fruit or saltwater battery to power a motor. From my 8 cell saltwater battery connected in series, I get a reading of 5V or so and 2-3A... but it won´t fire up my 5V DC motor. ...
0
votes
0answers
16 views

DC bushless motor position tracking in gimbals

I see that gimbal motors often are DC brushless, like this one. However, how is position tracking done? There doesn't seem to be sensors integrated and they only have 3 wires (3 phase?). Position ...
-4
votes
1answer
69 views

What kind of a Switch is this? How can i use this Switch [closed]

I found this switch in DVD drive, I think its a kind of mechanism which reverses the polarity of the motor. If so How can I use this with arduino uno? THis link might be useful : ...
7
votes
4answers
2k views

Why are motor capacitors huge in physical size even though their values are in uF range?

When I see some teardowns of single phase induction motors on the internet, I see their capacitors look like: Why are they that big in size compared to other caps, even though their value is in ...
0
votes
2answers
92 views

How to change logic when system shuts down

I try to think on a good way to control motor when I shut down the main PCB (which includes the MCU). How the system works today is when it's ON, the MCU enables the motor, the motor moves a ...
8
votes
2answers
6k 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 ...
0
votes
2answers
41 views

Electric latch for math toys

Please fix my tags. I'm making a series of interactive puzzles for use in classrooms. One of them is an equation graphing. It will have a grid of screws stuck into wood, with the axis drawn on. ...
1
vote
1answer
81 views

Using a single phase induction motor equivalent circuit in LTspice

I was planning to simulate a circuit which will control a single phase induction motor in LTspice where mains is 230VAC 50Hz. In my previous question, I failed to find an example: Modelling a ...
0
votes
1answer
52 views

Stepper motor reducing torque

I have a 5V stepper motor with a 1/64 gear reduction; it looks like this: When at rest, I can't turn the shaft with my fingers. However, when the shaft turns, I can. It seems that the torque is ...
-4
votes
0answers
13 views

Main to 12v adaptor to power motor [duplicate]

What adaptor should I use to run a 12V DC High torque motor (60 RPM) on the mains (240V)? Thanks for your help Salomé
1
vote
1answer
35 views

Modelling a “single-phase permanent split-capacitor motor” in LTspice

I'm planning to use an AC fan in an LTspice simulation. The AC fan is made up of a single-phase permanent split-capacitor (PSC) motor. Here is the actual fan: ...
-2
votes
0answers
39 views

My Arduino is heating up [migrated]

I am working on a simple Arduino project where I am controlling 5 TowerPro servos. I read that each takes up 2.2 V each so that means the Arduino can only handle about 2 , if using 5V. So far Ive ...
0
votes
0answers
29 views

Low-stroke, high-force linear actuator solutions with one dimension below 5 mm?

Scenario: I am working on a wearable actuator that requires an output displacement of 3 mm at 30 grams-force throughout (preferably more early on) and occupies at most 5 mm in the Z dimension. The X-Y ...
0
votes
0answers
49 views

Why won't my motor move from my Teensy 3.0?

I'm using the simple example exactly from here except I've changed pin 4 to pin 10 and instead of using an arduino I'm using a Teensy 3.0 However I cannot get it to work, the motor never starts ...
0
votes
1answer
59 views

Motor oscillates when driven by L293D [closed]

I've got problem with steering DC motor with L293D and Arduino. I'm using DC motor from old inkjet printer and a quadrature optical encoder from the same printer to track the position. When I'm moving ...
0
votes
1answer
45 views

Different amperage with a normal and a hook Multimeter?

I am measuring the electric power (P = VI) in a gear-motor. I measure it of two ways. One way is measure with a multimeter the resistance of the motor, then with V=RI, I measure the current, then I ...
2
votes
2answers
64 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
1answer
65 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
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
165 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
40 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.
1
vote
2answers
62 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
350 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
33 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
62 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
142 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 ...
0
votes
1answer
30 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. ...