# Tagged Questions

An electrical actuator converting electrical energy into rotational motion.

903 views

### Detecting a wire break

I'm trying to design a circuit where it is essentially a motor controlled by a microcontroller with some feedback. The motor will have its own isolated power supply and the actual on/off switch will ...
72 views

### Is the resistance in a DC Motor constant if the voltage is?

Is resistance in a DC motor constant if both the load and voltage are constant as well?
71 views

### Dahlander winding: Does the voltage rating change between connections?

From my understanding, "normal" motors in delta/wye connection, have rated interphase voltage of 220V in delta, 380V in wye. But how about Dahlander motors? These are motors that are built to achieve ...
23 views

### How to implement a BLDC for variable torque in its phase (InstaSPIN, TI)

By chance I read this patented method to control the rotor pitch without a swash plate usually a helicopter, by adding two parallel hinges on each blade root. When add torque to spin it the pitch ...
121 views

### Help With My Motor Controller Circuit Diagram

I'm a novice when it comes to electrical engineering, primary since I'm a programmer. However, I am trying to make a drone for fun and I made a really(REALLY) basic motor controller with some NPN ...
93 views

### brushed motor torque and efficiency? [closed]

What causes the rpm difference between peak brushed motor torque and peak brushed motor efficiency? source: http://members.toast.net/joerger/AskAaron/motors.html page 15 of this brushed & ...
116 views

### Motor control using potentiometer characteristics

I am trying to control a dc motor using potentiometer(armature control). Increase in voltage leads to increase in speed of motor. Even though this seems in accordance with general understanding, but i ...
23 views

### How do I determine expected harmonic frequencies and corresponding amplitudes in a case of synchronous machine?

1)find harmonic frequencies which source in synchronous machine in a) fault, and b) fault-free operation conditions, in steady state mode. 2) and find how harmonics are depended on power factor, load ...
58 views

### How to power a 150W with rechargable bateries?

I would like to build a gocart using a 150W 24V DC motor. To power it I would like to build a battery pack using 2Ah rechargeable batteries. The motor will run about 2 hours at 50% capacity (the ...
74 views

### If a load is placed onto a DC motor, will the current increase? [duplicate]

When a load, such as a weight on string, is placed into a motors axle, will this cause the current to increase?
53 views

### Why do VR motors like sinusoidal current?

I have a question regarding powering electrical motors, variable reluctance motors to be more precise (ie. Stepper motors). This kind of motor, in a perfect situation would like to be powered with ...
76 views

### Using an AC drill motor with DC?

I have this motor from drill that is powered from AC. Is possible to use the motor with DC current?
47 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 ...
140 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 ...
73 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?
73 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 ...
625 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 ...
43 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 ...
70 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 faster)....
81 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 ...
42 views

### Electric motors with both stater and rotor as electromagnets [closed]

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 ...
76 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 ...
102 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 ...
86 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 ...
72 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 ...
46 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. ...
76 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 ...
89 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 ...
65 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. ...
19 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 ...
73 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 : http://www....
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 ...
63 views

### Modification of a 3 phase AC motor [closed]

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 ...
47 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. ...
93 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 ...
63 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 ...
114 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 "...
64 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: http://uk.rs-online.com/web/p/axial-fans/...
57 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 ...
68 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 ...
47 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 ...
90 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 ...
49 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 ...
289 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 ...
50 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.
78 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 ...
38 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. ...
112 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 ...