A common actuator in robotics; it's usually made of a static magnet (stator) and a set of moving inductors, acting as electromagnets, connected to the circuit through brushes. Brushless motors use phased clocks with electronic circuitry to generate motion.

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2answers
66 views

Battery voltage drops when connected to a motor

I was recently working on a quadcopter so I bought a pair of coreless DC motor. My intention was to use an Arduino (DIP chip) to control the speed of the DC motor (rated 3.7 V) through a transistor. ...
-4
votes
2answers
46 views

Motor running slowly with no friction [on hold]

This has been troubling me for a while. A few days ago I mounted this circuit onto my breadboard, and even though it works, it does so very poorly. The motor I'm trying to drive is a 12vDC motor ...
-1
votes
2answers
67 views

Overvolting a dc motor while keeping power constant

So i have 36v dc motor rated 70A at 2000w (mechanical output power) . I would like to run the system at 48v (same power) because i have a lot of accessories for 48v system ( battery chargers , dc/dc ...
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0answers
42 views

4 wire DC motor

I have a 4 wire small DC motor labelled only 9V DC The red/black leads are labelled v / - and connecting a 9v dc supply to them makes the motor turn. The other 2leads are both labelled p. ...
11
votes
3answers
808 views

Is there an ideal PWM frequency for DC brush motors?

I'll be using a microcontroller to create a pwm signal for motor control. I understand how PWM and duty cycle works, however I am unsure about an ideal frequency. I do not have my motor in yet, so I ...
1
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1answer
32 views

what are the other 2 pins for in this old dc motor (Sankyo BFB9L11)?

I received a box full of old electronic components and the pictured DC motor was in it (4 pins labelled as '+' '-' and 'P', 'P'). I would like to know what are the 'P' labelled pins for. Thanks in ...
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2answers
43 views

Small DC Motors [closed]

I'm trying to define what a small DC motor would be. I'm having problems why some kind of DC motors can't be built in small size. Look this diagram: I'd like to know why some of these kinds of ...
0
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2answers
42 views

Am I correctly concluding that these two AC/DC adapters are interchangeable [duplicate]

I'm in the US with 120V mains. I have a "heavy" style AC/DC adapter (weighs a pound or so) and a lighter one (weighs a couple of ounces) which came off a 1TB Seagate NAS. Can I replace the heavy one ...
0
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3answers
71 views

Power a 12 volt water pump from a 110 watt solar PV panel

I have a 12 volt DC 9 amp water pump that I would like to power from a 110 watt 12 volt (17.2 volt at peak) 6.4 amp solar PV panel. I only want to run the pump when the sun is out, it's circulating ...
1
vote
1answer
49 views

High current motor control

When designing for relatively high currents, e.g. 6-10A, what is the standard practice for motor control? Is it to construct an H-bridge out of discrete components, to use integrated half bridges, or ...
3
votes
2answers
152 views

Why do simple H-Bridges that use PNPs combined with NPNs not short themselves out immediately (or do they)?

There is a simple design for an H-bridge that I keep seeing all over the place. simulate this circuit – Schematic created using CircuitLab This design is featured on the Sparkfun ...
0
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1answer
58 views

Does the battery have to be rated for the full starting current of a DC motor

Do we have to select a battery capable of delivering the full starting current (which is high as it is the stall current) of the DC motor, or is it enough if the battery is rated for a bit more ...
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2answers
26 views

electronic speed control of 3 post compound DC motor

I've got a 12V DC winch motor with two field posts and an armature post (compound motor). Currently direction is controlled by four solenoids. Here's a diagram which boils this down two the two ...
2
votes
0answers
58 views

What kind of DC motor should I get for raising my blinds? [closed]

I have large blinds that cover sliding glass doors in my condo. Unfortunately, the draw string to raise / lower them pops out regularly. I've decided I want to automate the raising / lowering with a ...
0
votes
2answers
54 views

Simple transistor motor driver does not work properly?

The transistor gets hot to the touch and the motor will continue to run when I disconnect the transistors base from 9v+ (I am trying to make sure the circuit works before I hook it up to an arduino). ...
0
votes
1answer
47 views

What is a torque motor exactly?

Wikipedia states Torque motors are normally induction motors of toroidal construction. Their main differences from other similar motors are their wide diameters, to allow for high levels of ...
0
votes
3answers
44 views

Techniques for driving inductive load, e.g DC motor, with PWM and constant current

I'm having trouble getting full torque out of a DC motor at anything other than full speed with a PWM driving circuit. Assuming the problem is inductance of the coils, what can be done besides ...
0
votes
2answers
131 views

How to connect flyback diodes on a h-bridge [closed]

I'm using a SN754410NE h-bridge to drive two DC motors (4.5V each) with Arduino. After testing the circuit and the code, I made a standalone Arduino on a perma-proto breadboard. My problem is that ...
1
vote
1answer
65 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?
0
votes
2answers
64 views

DC motor won't spin without a push

just got this http://www.robotshop.com/en/rs-775-motor-7000rpm-12v-7613oz-in.html I hook it up to 12VDC power source for a test ; the motor doesn't run without a push and I read 4V, 0.46A on my ...
3
votes
1answer
58 views

Number of capacitors for a DC motor

I have found an article that suggests using one, two or three capacitors to filter DC motor noise. over the motor terminals from each terminal to the casing both between terminals and between ...
0
votes
1answer
71 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?
-1
votes
1answer
57 views

How To make Variable Power for a Trolling Motor

I have a trolling motor that works, but the circuit board does not work. I am looking for a way to make it a 3 speed motor. I have a switch that allows for 12 Volt input and then based on the ...
-4
votes
1answer
38 views

fully Controlled Bridge with BT151

I have tried BT151 for my half bridge controller to drive a DC motor. unlikely, it doesn't work. I would be grateful if you help me through this question. .
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votes
0answers
49 views

DC motor go very slow in one direction

I try to control a simple 6V with an H-Bridge controlled by a standalone atmega328p/pu, but i found a very big problem. In one direction the motor goes fine, but if I try to change the direction, the ...
0
votes
2answers
47 views

Opinion on design changes for Latch circuit

So just to give some background I've designed a circuit to suit the following task. 12V DC Motor moving a carriage up and down a column 2 'End stop' magnets, active-low hall effect sensor attached ...
0
votes
0answers
24 views

Measuring DC-Motor stator current

I am having some doubts about my measurements, and I would like to verify them if possible. I am using the circuit in the image, to measure the stator current of a DC-Motor, I just want to know if ...
1
vote
4answers
73 views

Calculate Back EMF from Torque Constant

I have a DC motor with a torque constant of 1.05 mNm/A. How do I calculate back emf constant from torque constant (mNm/A)? I have information that is in the maxon catalog.(DCX 10 S metal brush ...
0
votes
0answers
28 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
1answer
52 views

How can I add two limit switches in this circuit?

Here is schematic for control of rotating direction of DC motor using two relays: How can I add two limit switches here? When limit is reached I want to stop motor and of course to be able to move ...
0
votes
1answer
45 views

Remote control of DC motor

This is PWM controller I bought for speed control of DC motor: http://www.ebay.com/itm/6-30V-DC-Motor-speed-Controller-Reversible-PWM-Control-Forward-Reverse-Switch-/162002954574?hash=item25b820e94e:...
0
votes
1answer
40 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 ...
-1
votes
2answers
65 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 ...
0
votes
3answers
74 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
26 views

Does a shunt regulator protect other ICs from high current transient spikes?

Does a shunt regulator like 431L (datasheet), wired like this (VKA is not connected to anything) help protect other electronics supplied from INPUT net (battery connection)? INPUT net also supplies ...
0
votes
1answer
16 views

Error in powergui block in Simulink involving vector dimensions.

I am designing a DC machine in Simscape, but when I try to run the simulation there is this weird error: "Error in port widths or dimensions. Input port 2 of 'simulacaodcmono/powergui/...
1
vote
2answers
47 views

Diode Sizing for DC Motor H-Bridge

How do I calculate the size of the diodes used in an H-bridge for a DC motor? What is the relationship between the motor parameters and the diode parameters?
1
vote
1answer
81 views

voltage too low at dc motor

I'm not experienced in electronics and I need your help. I have the circuit represented here, my intention is to put a dc motor working (in my case a water pump), using an Arduino Uno as a switch. ...
0
votes
1answer
37 views

Low-side DC shunt motor drive

I want to drive a DC shunt motor like in the picture below. The PWM circuit with optocoupler, mosfet driver etc. is not shown. This circuit works fine on 12V DC motors. It even worked when tested on ...
3
votes
2answers
85 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 ...
0
votes
1answer
58 views

soft starter code for avr

I need to control 2 DC motors (Maxon RE40) using an AVR (atmega328) through pwm. I was wondering what is the right way to approach the situation. Should I increment the duty-cycle at a specific time ...
-1
votes
2answers
66 views

Controlling brushless gimbal motor (BGM2804)

I'm using a standard board for control this type of motor (SimpleBGC), this board uses an atmeg328p e some brushless drivers. I'm writing a simple code for turn left/right with some velocity, but i'm ...
1
vote
1answer
60 views

Detecting motor stall with lm311

I have 9v DC motor that I want to use to lock a door. Control is achieved using an esp8266 board. The esp8266 also switches the direction of rotation via an H bridge. So far, so good.. Now I want to ...
-3
votes
1answer
80 views

H Bridge not working [closed]

I've created an H-bridge for a dc motor that will be controlled by an arduino the bridge has one input and a not gate it has two state forward and backward thats the circuit: it doesn't work :/ How ...
-1
votes
3answers
510 views

C or D batteries instead of AA [duplicate]

a few days ago I had a asked a question regarding longer lasting batteries for a walking robot built with a Tamiya gearbox. Since the AA batteries were being depleted too fast, it was suggested that I ...
0
votes
1answer
40 views

Batteries for 3v gearbox

What kind of battery can I use to power a 3v DC gearbox, which can provide power for a longer duration? I have used AA batteries but they get depleted very fast. This is for a mechanical walking robot ...
0
votes
2answers
66 views

Brushed Motor Voltage Drop

First of all, I'm fairly new to electronics. I've been working on my own version of a miniature hovercraft just like this one http://www.thingiverse.com/thing:68639. I'm using an arduino pro mini for ...
0
votes
2answers
61 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
2answers
153 views

Can current flow both ways through a transistor?

Last night I was experimenting with and motors and transistors. I was testing out NPN and PNP transistors to learn more about how they work and how I can use microcontrollers to control the speed with ...
0
votes
1answer
35 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, ...