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
30 views

Does the transformer in this circuit cause a voltage drop to the DC motor?

In this circuit: Is the transformer and the circuit on the secondary side of the transformer only there for the test-point or does it affect the voltage to the DC motor? The DC motor is a 90V motor ...
0
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1answer
48 views

DC Motor Power Amplifier issue

i built this DC motor power amplifier to drive the motor in both directions using an analog signal (from -1 volt to 1 volt via the potentiometer ) , the motor i use is rated for 24 volts and draws ...
1
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2answers
33 views

Maximising DC motor torque within parameters - and stuck on terminology

Mandatory components: 24v DC supply, No-name PWM speed controller (originally packaged with 24v 250w DC motor) Existing but replaceable: 24V DC, 14A, 250W, 2750RPM motor. Need: The most torque I can ...
3
votes
2answers
189 views

Why is there a power drop in a serial circuit, but not in a parallel circuit?

I performed an experiment to compare the power dropped on a combination of a motor (small fan) and a lamp. I got the motor and a lamp from a lab, they are very old and all labels on the elements are ...
0
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0answers
38 views

High-accuracy high-resolution motor for less than $100? [closed]

I am working on a robot which requires a motor to turn accurately and repeatedly to within .5 degree (but .1 degree would be better). Torque is not at all important and speed only somewhat (>30 rpm ...
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1answer
87 views

Driving ~3V hobby DC motors

Normally I've always used the L293D chip to drive my motors, but for a new project I am working on I will be using motors that I'll operate between 2.5 - 3.5V and I intend to power them using a single ...
0
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1answer
52 views

Somethings about Infineon BTN8962

I want to design a BDC driving board with Infineon BTN8962.(Infineon BTN8962 is a half of H-bridge IC) As we all know,BDC driving circuit is just like this: In this picture,We set a High side MOS(...
0
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1answer
29 views

Optimal method for switching power to a DC motor spindle

I'm trying to use a 5V DC signal from a microcontroller to electronically switch power to a DC spindle (for use within a router I'm trying to build). The supply I'm using is a 48V-DC PSU (8.3A rating)....
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1answer
38 views

why do I need a pwm and H bridge, after a PID controller to feed a dc motor?

let's focus on current control. here's how I understood how the control works: (picture below) Basically I feed my PID with a reference current minus the measured current (i.e. I have a negative ...
0
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0answers
25 views

Pwm motor Driver

Hello, I was trying to make a motor driver for my project which can power motors at 12V.. For this, I made the same circuit as shown in the image but it is not working for some reason and the ir2110 ...
0
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2answers
56 views

why commutator requires so many slots

At a given point of time, current in any wire in armature winding is either positive or in negative direction, then why there is a need of so many slots in commutator? doesn't a two slot commutator ...
0
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1answer
71 views

Why L6743D MOSFET driver is not working properly?

I've started to build a brushless driver by using some Power MOSFETs and some MOSFET drivers, in order to drive the Power MOSFETs. I have connected the chips as shown in the application circuit (page ...
0
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1answer
90 views

Why did starting a motor burn out my power regulator?

I'm driving a 12v, 1.5A (no load) motor from a 12v lead acid battery. From this same 12v source, I connected a 5v boost/buck power regulator behind a few diodes to drop the nominal 12.9v from the ...
1
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1answer
33 views

How does a brushed motor's current change over its lifetime?

As the title says, what should I expect a DC brushed motor's current to look like over time? I'm using a standard 12v DC brushed motor in a long-life application, and I've got a current sensor ...
1
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2answers
43 views

Using Gyroscope data need to stabilise the Objects

I am working on a system that maintains its fixed position i.e does not vibrate in a situation like Earth Quake or any Vibration of Machine/Tremor like situation occurs. Now for that system i first ...
0
votes
1answer
38 views

Can someone help me fix this water level controller?

A, B and C are the prongs that stick into the water at 1/4, half and full respectively. D is used to provide the current to switch on each of the prongs as the come in contact with the water. That ...
0
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4answers
105 views

Rapid Reverse polarity

This is the circuit for reverse voltage protection, R2 is the load of a motor. The problem is that there is a test where the changing of polarity is very fast ( <5ms) and the MOS burns. Power ...
1
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2answers
73 views

How to make a simple manual gengerator that can produce a 9 volts of electricity?

I have a project from my subject which that project was to create a manual generator that can produce up to 9 volts of electricity. I've been searching some samples that is homemade manual generators, ...
0
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2answers
97 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. ...
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votes
2answers
48 views

Motor running slowly with no friction [closed]

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 ...
0
votes
2answers
80 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 ...
0
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0answers
48 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. ...
14
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5answers
990 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
35 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 ...
0
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2answers
65 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
43 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
83 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
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1answer
51 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
154 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
votes
1answer
60 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 ...
0
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2answers
28 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
60 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
57 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
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1answer
50 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
61 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
135 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
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?
0
votes
2answers
68 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
59 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
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?
-4
votes
1answer
41 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. .
0
votes
0answers
53 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
50 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
85 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
44 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
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1answer
53 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
49 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
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 ...
-1
votes
2answers
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 ...