Tagged Questions

5
votes
1answer
72 views

DC Motor Overvoltage Operation

I am new to PWM control. Is it advisable to operate a motor at higher than rated voltage with the "PWM average voltage" more than the nominal voltage specified in the datasheets? After some ...
0
votes
1answer
47 views

PWM Motor Speed Control

I recently bought one of these: When i hooked it up to my 24v power supply and a voltmeter, it was either 0 or 24v with the POT. Nowhere in between. Why is this? Is it becasue this is a PWM device ...
3
votes
1answer
179 views

Criteria behind selecting pwm frequency for speed control of a dc motor?

I'm working on a speed control circuit for a brushed dc motor (24v, 500rpm, 2A, 4kgcm). The main components that I plan to use are PIC16f873, 4n25 optocoupler, IRFZ44N MOSFET, BY 500 - 800 diode(for ...
4
votes
3answers
165 views

Driving Permanent Magnet DC Motor via PWM

SUMMARY: I am currently trying to finish up a DIY project I've been working on for a while: Building an electric potters wheel. I acquired a treadmill and salvaged quite a few good parts from it, and ...
1
vote
0answers
38 views

Parallel, low noise motor driver design with L293D [duplicate]

I'm designing a very basic motor driver circuit for 12V DC brushed motors to be connected with my microcontroller. The motor needs to be driven in forward and reverse My objective is to do that with ...
1
vote
2answers
266 views

PWM Motor speed control using PIC; What mosfet to use

I have a 5V PIC16f877a controlling the speed of the motor 12V which has a power rating of 8W; the current will be around(600mA) am I correct? The motor is basically a small water pump commonly used ...
5
votes
2answers
140 views

making a dc motor sing under load

I have a battery operated toothbrush that I want to generate notes with using PWM on the motor. The microcontroller used is an Arduino for testing and am able to get a bare motor to generate tones. I ...
6
votes
2answers
421 views

Help with 555PWM motor control

I'm making a laser spirograph for a school project. It requires speed control of three motors. I used a simple 555 astable circuit with a pot for control, then the output goes into the base of a power ...
3
votes
1answer
364 views

Half-H bridge or low-side MOSFET for PWM motor control

I'm driving a DC motor (12 V, approx. 4 A) and I need to control the speed by PWM but I need one direction only and braking is not required. My question is: is there any advantage to using a half-H ...
5
votes
2answers
315 views

Controlling DC motors with PWM in MCU

1.Is this the correct way to control a DC motor using the PWM pins in the MCU? 2.How many PWM output pins do you need if you want to use a driver (ex: H-bridge) for each motor and control the duty ...
-2
votes
1answer
192 views

What the relation between the movement of a motor and the PWM voltage [closed]

I am making a robot that moves in a circle with 2 wheels, each wheel moves using a DC motor with 12V. I want a relation between the circle and the voltage that is produced by PWM.
2
votes
1answer
727 views

Does changing PWM frequency in arduino affects SPI and I2C communication and helps controlling DC motor?

I'm using L293D based motor shield for controlling two dc-motors from Arduino Mega 2560. I use 5 and 6 PWM pin for setting speed of each motor. I have two questions: Does increasing frequency of PWM ...
3
votes
2answers
2k views

Algorithm for mixing 2 axis analog input to control a differential motor drive

I am looking for information about how to implement proper mixing of 2 analog joystick signals (X an Y axis) to control a dual differential motor drive ("tank like" drive) using a uC (ATMega328p in my ...
4
votes
1answer
184 views

Maximum switching speed of a motor

If I have a MOSFET (or a number of paralleled MOSFETs) driving a motor, what determines the maximum bandwidth (PWM frequency) at which I can excite a motor phase? Is this only a function of the total ...
1
vote
1answer
520 views

Controlling Dc Motor With Pwm

I found that I can control one dc motor with PWM from P1.2.What how i'm going to wire it? How I am going to divide voltage in this picture.In physical way.
3
votes
4answers
1k views

Arduino serial communication fails when stalling/loading a DC motor controlled by PWM

I'm using the following circuit (from http://luckylarry.co.uk/arduino-projects/arduino-control-a-dc-motor-with-potentiometer-and-multiple-power-supplies/) to control the speed of a 6V DC motor powered ...
3
votes
2answers
493 views

Will PWM on 50% duty cycle cut the current in a DC motor in half

I have a DC motor that is controlled by a PWM output on an Ardiono and I want to know if I can safely assume that by setting the output to 50% duty cycle, the current in the motor will be 50 % as well ...