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.

learn more… | top users | synonyms

-1
votes
1answer
18 views

Cumulatively excited and Differentially excited DC generator

Is a cumulatively excited DC generator long shunt or short shunt motor?
1
vote
1answer
83 views

Why can't we command two DC motors with just 2 relays for each in opposite directions with a same power supply? [closed]

We managed to control 2 DC motors with 2 relays for each one.It worked great except one thing: we couldn't make them turn in opposite directions at the same time .We noticed that there was a shot ...
-2
votes
0answers
41 views

AC / DC Axial Fan power usage VS. performance

My question is about Axial fans. Specifically, similarly sized, built and performant AC / DC axial fans. Given 2 fans from the same manufacturer which can push very similar amount of air, with ...
0
votes
0answers
43 views

Create a negative volt with a 9v battery to run a 18V motor

I've got to create a small toy car running on a 9V battery to participate on a small race of 2x 15m and would like to use a bigger motor running on 12-18V. If I'd create a negative voltage it should ...
0
votes
2answers
62 views

Using the same power source for microcontroller (arduino) and rest of the circuit?

I have an Arduino, it controls a 6V DC motor and 12V DC solenoid (which only really needs 7V for what its doing). Originally I wanted to use 1 rechargeable 7V battery (or 9 or whatever the closest I ...
0
votes
1answer
52 views

Using dc motor as a sensor

I am thinking about an automatic blind opener/closer. In this idea I need to detect the end of blind while opening or closing to stop the motor. I don't want to use mechanical sensors on both side ...
2
votes
1answer
51 views

Eliminate PWM noise in PWM-driven bidirectional motor

I need to drive a DC motor with PWM, through a H-bridge. The controller can't generate PWM at ultrasonic frequencies with resolution I desire, and the low-end of the spectrum (~100Hz) may be too slow ...
2
votes
3answers
62 views

Current drawn by a permanent magnet DC motor

I have been working with PMDC motors for a while now. In these motors, as the load increases current drawn by the motor also increases. I was just wondering what is the theoretical reason behind this ...
3
votes
1answer
85 views

Difficulty getting motor to reverse

I am building a humane rodent trap, and require assistance. The trap works using an LED (not shown) and LDR (photoresistor). When the rodent walks over the LED, The LDR increases in resistance and ...
0
votes
2answers
124 views

H-Bridge Instant Death

I have a DRV8840 that I am trying to use. I have burned up about 10 of them trying to get it working. For this application, I need the H-Bridge to Current Limit and Brake the motor. Max current ...
0
votes
3answers
73 views

Connecting diodes to a motor in H-bridge

I'm attempting to design a three wheeled toy that is controlled by a remote connected with it via a cable. I first designed it with relays, however I had to change to transistors due to contrast ...
0
votes
1answer
39 views

Transfer Function: State Space for DC motor

General question on making state space equations for a DC motor. In the link below, why are both the electrical and dynamics equations 3 and 4 used to make a state space eqn.8, instead of combining ...
0
votes
1answer
39 views

How to regen a DC motor from the high-side of a boost converter?

I am planning to drive a 24v motor from a 12v battery, using a DC-DC boost circuit to generate the 24v and an H-bridge to PWM drive the motor. A problem arises when the motor goes into the regen ...
3
votes
1answer
330 views

Why does the potentiometer burn up in my setup?

I connected a potentiometer to my DC power supply (max 1A, 12V), and then connected a motor to the variable voltage side of potentiometer as well. The potentiometer is just 1K. When I tried using ...
1
vote
2answers
143 views

limit switches to control motor direction

I am trying to use two limit switches and two DPDT relays to control the direction of the motor. When the power is applied the motor should rotate one direction (direction for this question isn't ...
0
votes
1answer
65 views

MOSFET controlled DC motor too slow

I want to control a DC motor using a P-channel MOSFET. I tried the motor with a 5VDC power supply. It works perfectly and speeds up in no time. I measured the current flowing through, it's around ...
3
votes
4answers
668 views

How to get more current from 555 timer?

My power supply is filtered regulated 5 volt 500 mA . I am using a 555 in monostable mode to switch the motor on for a certain amount of time after the 555 is trigerred. (The 555 is being trigerred by ...
1
vote
4answers
112 views

Control strong DC motor with microcontroller

Could anyone explain to me what it takes to control a strong DC motor with e.g. an AVR? For example if I have a 24V Motor with 5A or more. How can I build such a circuit? Especially if I want to ...
1
vote
2answers
102 views

How can I increase the torque, but not the speed of this DC motor to gear with a potentiometer setup?

Short video of the machine running. It's made of three AAA batteries in series giving a total of 4.5V to the DC motor, these are connected through a potentiometer to control the speed. The DC motor ...
0
votes
2answers
148 views

Cascading PID DC Motor Position & Velocity Controllers

I'm trying to build a robot with a differential drive powered by two DC motors. First I implemented a PID Controller to control the velocity of each motor independently. Estimated the TF using the ...
0
votes
2answers
74 views

Will brushless fan speed depend on amperage?

I am not a technical guy and have no knowledge in electrical subject. I use brushless fans in my regular day to day activity. We use them for pellet stoves and hence my question: Will amperage ...
2
votes
3answers
124 views

Is Back EMF relevant in dynamos, where there is electric generation?

While doing some research about dynamos, I came across a situation wherein there was a question about the validity of my dynamo design. The counter to the design I suggested was that there would be ...
1
vote
0answers
55 views

L293D causing motors to move slowly

I'm modifying an RC car to use bluetooth. I use the L293D chip, and when I connect the motor to the chip, the car barely moves. If I connect the 9V battery directly to the motor, it moves the car ...
3
votes
1answer
42 views

Speed and Position Control for high-volt Elektro Motor with AVR

Is there anything that one can purchase to control speed and position of a high voltage electro motor? I am quite a bit of a noob at this but I could think of a circuit using photo-sensors or ...
0
votes
4answers
143 views

How to increase torque and decrease RPM of a DC motor?

The motor is an old one from a cassete player of some sort. I am powering the motor with a 9 volt battery, but it's RPM is too high for the desired purpose. I have used gears to reduce RPM but it is ...
0
votes
1answer
42 views

Selecting MOSFETs for Motor

I want to implement a driver circuit for a (sensored) motor that I am purchasing which has the characteristics (on the shopping website): Max Amps: 16 Max Power: 350W ESC: 35A KV: 1900 The ...
1
vote
1answer
36 views

PWM input voltage regulation

I have a 12V DC motor that I plan to run in one direction with PWM input at 21A. However, in the other direction I want to drop the voltage to limit the speed. Ideally. the regulator would sit between ...
-2
votes
2answers
168 views

130V DC Motor Control

I am interested in building a control circuit for a motor. More specifically this motor. The model I want to control is the 130V model, 0.48A, which should make it at ~62W for the motor, and 1/17 ...
0
votes
0answers
69 views

Do I need a resistor for powering a 3-12v dc motor with USB 2.0

I'm trying to make a project from instructables: http://www.instructables.com/id/ATtiny8545-POV-Display/?ALLSTEPS And the guy uses resistors for his usb cable and now I'm not sure if I need to use ...
1
vote
1answer
80 views

DC motor spun clockwise then counter clockwise creates AC current?

I am making a generator with a DC motor but the style of turning the rotor would be clockwise and then counter-clockwise, and I would want to capture as much current as possible so I hope it could be ...
1
vote
3answers
168 views

Complementary H-Bridge Motor control

I have some concerns in a motor control board I designed. Sometimes the MOSFETs unexpectedly start to burn. I suspect one of the reasons is the thin track (0.2mm) I have in my flexible board (0.2mm), ...
-5
votes
1answer
47 views

how to select Dc Motor

I have air conditioning application where i want to run blower @ 1500 rpm. Motor is rated for 48-56v DC. The operation of motor is continuous mode. Let me know calculation involved here Minimum ...
2
votes
6answers
752 views

How to create an electronically controllable resistance to a physical movement?

What is the best way to create an electronically controllable resistance to a physical movement? For example, at the gym you control the resistance to movement by putting more load, more weight. Is ...
1
vote
2answers
113 views

DC-DC converter to drive DC motor

In a robotics application I have to install a 12V (30A) DC motor actuator in a vehicle. The typical setup indicated by the manufacturer is to directly connect it to the battery, because of inrush ...
0
votes
1answer
59 views

Stepper Control using DC Brushed Motor Driver

Is there any way to control a bipolar stepper motor using one or more DC brushed motor drivers? My only interface to the motors is setting an integer to represent their speed, ex -100 to 100. I ...
0
votes
0answers
36 views

Choosing a suitable power supply for a Robotzone gear motor

I'm building a project using a DC geared motor that I purchased from here: Servocity I need to know the specs of the power supply that can be used with this motor. How much current do I need? There ...
1
vote
2answers
84 views

Get motor ratings from unknown DC motors

I've purchased bulk cheap DC motors for a robot problem. But I don't know their ratings. Is there a way for me to find out? For instance, I would like to know their max DC voltage input using basic ...
0
votes
2answers
140 views

How do transistors work in a circuit? [duplicate]

I'm currently just getting involved with electronics, just bought an Arduino starter kit and am fiddling around with it. Currently i'm on a project which involves the use of a DC(spinning) motor in ...
1
vote
2answers
274 views

Is it safe to use a voltage divider for Arduino and DC motor controller?

I have ordered a Dual H-Bridge 12A continuous (30A peak) Polulu motor driver shield for my upcoming (first time ever, a 1.2m long tank made of wood) robot project. I was thinking about how to supply ...
0
votes
1answer
95 views

Separated powers and high power switches? Alternatives to relais?

I want to use an Arduino (5V, 0-40 milliamps) to control some switches, which in turn control a high current line (12V, 40A). But the relays which I use use too heavy coils for the Arduino to pull ...
0
votes
1answer
43 views

Vex 393 motor with 12V supply

Have a Vex 393 2-wire motor and I'm using a 6-40V PWM driver @ 5A max. My question is this... The Vex was spec'd at 4.8A stall current and 0.37A no-load current at 7.2V. From what I've read here ...
0
votes
1answer
47 views

DRV8835 OCP false trip?

I built a simple motor driver circuit using Texas Instrument's DRV8835 motor driver IC. The IC is driven in IN/IN mode, (the mode pin is left unconnected, pulled down by the internal resistor). VM is ...
2
votes
2answers
464 views

Why use stepper/DC motor driver?

Why use or implement a DC/stepper motor controller? Is it not possible to connect the motor directly to an MCU output pin without the driver?
2
votes
3answers
184 views

How to make two motors spin at the same speed?

I am currently using two identical motors to drive a robot. The motors are both controlled using relays but one of the motors is spinning faster than the other. How can I slow down the faster motor ...
0
votes
1answer
61 views

DRV8837 PWM input?

I'm setting up a DRV8837 driver to work with an adjustable DC motor voltage (controlling the rotation speed). The datasheet claims The DRV8837 is controlled using a PWM input interface, also ...
1
vote
1answer
240 views

48V PWM Motor Controller

I considering doing an electric Go-Kart project with two direct drive rear 48v motors (considering two of these). I plan to control it using Arduino PWM pins. However, I am not sure of the route to go ...
1
vote
2answers
181 views

Preventing relay contacts from sparking on disconnect

I am currently using an 80A automotive relay to control a motor. The relay seems to work great to control the motor, but on disconnect a visible spark can be seen through the clear relay housing. I ...
0
votes
1answer
154 views

Adding Speed Control for a DC Motor

Relatively new to circuits, but I have found this good motor control circuit for a DC motor (I have 2 microswitches, each one reversing the direction of the motor), the only thing is I am having some ...
1
vote
1answer
48 views

Is it possible to use 2 relays instead of a DC motor controller?

I have been for motor controllers to control two 12V motors that have a stall current of 130A and at max power (expected operation) will draw 68A. I am having trouble finding low cost motor ...
0
votes
3answers
141 views

Motor PWM Controllers Too Good to be True

I am working on a project which involves driving 2 high power 60amp stall 12v motors from an arduino. I had been browsing available drivers, and everything on the market seems to be quite expensive ...