An electrical actuator converting electrical energy into rotational motion.
2
votes
2answers
194 views
Use Micro-Controller Instead of ESC
I was wondering if I could use something like microcontroller instead of an ESC. I tried finding tutorials on Google and YouTube and I couldn't find anything useful. Could you please help me?
P.S.
I ...
2
votes
1answer
85 views
Input rated current for easydriver 4.4
I am using easydriver 4.4 to control stepper motor. Easy driver takes input voltage from 7 to 30V. I fed 20V 3.0A to easydriver, but i got it burnt (easydriver)*. Is 3.0A too much for easydriver ? ...
2
votes
1answer
117 views
Motomama arduino motor shield issues
I loaded up the example sketch for the itead Motomama on my Arduino Mega ADK and I see the green led's in the middle of the board slowly going on and off as expected from the sketch. The problem is, ...
0
votes
0answers
92 views
arduino and the rc car [closed]
I am trying to build a chassis for my robot, so I chose the base of a RC car. I took out its receiver board and replaced it with an arduino board to control its motors (steering and rear motors) but ...
-3
votes
1answer
90 views
What are the shiny yellowish metal parts on this motor? [closed]
Here's a picture of Bombardier MITRAC permanent magnet motor (click for larger size)
What are these shiny yellowish things on the three motor parts which extend to the left? Are those some kind of ...
2
votes
1answer
143 views
Motor control with AVR
I am used to work with PICs, but I want to start using AVRs as well. One thing I like in the PICs is the EPWM (enhanced PWM) peripheral, in which you just set a couple of registers, and the PIC will ...
16
votes
4answers
1k views
Why Tesla car use AC motor instead of DC one?
I just watch this mega factory and wonder why they use AC motor (exact time here) which require the power inveter, instead of DC which more direct from they DC battery. Introducing inveter mean more ...
3
votes
2answers
155 views
Maximum power for Arduino Monster Moto Shield
I'm reading the specs for the SparkFun Monster Moto shield which specifies that
Max Voltage is 16V
Maximum Current 30A
Given Ohm's law, does that mean that the maximum power is 480 watts? That ...
8
votes
4answers
680 views
Why use DC motors for driving elevators?
This New York Times article says that on November 14, 2007 Consolidated Edison Company was going to end supplying direct current to the remaining several buildings that used those to run elevators.
I ...
1
vote
0answers
92 views
Difference between a dc and ac motor [closed]
The supply difference ok. What other differences are their for them. For example , field windings , structure, alternating flux, commutator, and the advantages.
Kindly help me with good images, ...
2
votes
1answer
116 views
Is a 3V power loss normal when using the official Arduino Motor Shield?
I have an input voltage of 8.5 volts (6 AA Batteries) plugged into an Arduino Uno R3 and then on that I have a Arduino Motor Shield. Then I connected a DC motor to the A+ and A- screw terminals. Then ...
-4
votes
2answers
125 views
Circuit for LED and motor
I'm building a vibrating dog that lights up for my friend's birthday. I've designed this circuit, but I'm not sure if it's the best way to do things. Specifically, I don't know if there is enough ...
3
votes
2answers
256 views
Why exactly does Connecting a Motor Directly to an Arduino Damage it?
I understand that you usually need an H-Bridge or some sort of Motor Driver to connect a Motor to an Arduino, as otherwise it will damage it.
But why is this, I mean I realize each pin can only ...
0
votes
1answer
299 views
line follower design with atmega328 and mosfet controlled motors
I made a design for my line follower. I am using an atmega328 from a duemilanove board. The motors of the line follower are connected to two mosfet transistors which are pulse width modulated from the ...
0
votes
2answers
239 views
continuous servo position control
with a continuous rotation servo i can control the direction and the speed of the servo , but i need to control the position too , i know it's not possible directly due to lake of feedback control in ...
3
votes
3answers
232 views
What is the use of PWM over brushless control
I just saw this question How do I eliminate PWM noise when driving a fan? but cannot think of the reason why is doing PWM over brush-less control useful.
I am assuming people are trying to control ...
3
votes
1answer
495 views
Using a TIP122 to control a motor
How do I control a hobbyist DC motor with a TIP122 transistor?
I want to control it with the Arduino PWM pins, the power supply is 4 1.5V AA batteries connected in series giving 6v.
Also, what steps ...
1
vote
4answers
91 views
Single motor driving multiple targets - possible?
I'm a veteran programmer new to the electro/mechanical world and unfamiliar with the terminology and what's already available. I have a single motor that I would like to use to drive a carousel or an ...
10
votes
1answer
931 views
How can I implement regenerative braking of a DC motor?
I know that many electric cars are able to convert the momentum of the car into stored energy in batteries, rather than convert it to useless heat at the brake pads. How does this work? How can I ...
7
votes
3answers
306 views
Why should I worry about a motor causing my supply voltage to shoot up when the back-EMF can't exceed the supply voltage?
I have heard people say that in motor control circuits, one must take precautions to keep the motor from feeding back into the power supply, causing the supply voltage to rise, consequently breaking ...
3
votes
1answer
168 views
Choosing relay to operate water pump
Based on my research so far, I've concluded that a relatively low-cost, yet reasonably reliable way to control operation (on/off) a motorized water pump, is a well spec'd EM-relay with flyback diode. ...
5
votes
1answer
175 views
How to re-magnetize a permenent magnet motor of small size (model railroad)?
I have several small DC motors where if I place an extra magnet to back-up the included magnet, the performance seems to improve significantly.
These motors are 30-40 years old & their ...
3
votes
3answers
467 views
Detecting dry-running of water pump
What are some reasonably reliable ways of detecting that a water pump (electrical motor based) is "dry running", i.e. no water is passing through the pump either because there is no water available at ...
6
votes
1answer
1k views
How can I measure back-EMF to infer the speed of a DC motor?
I'm interested in measuring the back-EMF of a motor to determine a motor's speed because it's cheap and requires no additional mechanical parts. How can I measure the back-EMF when I'm driving the ...
14
votes
3answers
479 views
In a DC motor, is there one commutation point that is optimal in all respects?
This recent question got me thinking about commutation timing, and why advancing it can be desirable. However, I wanted to consider more deeply the underlying phenomena, and I'm pretty sure my ...
4
votes
3answers
193 views
Why are the pins on the official arduino motor shield so long?
Here is the Official Motor sheild website.
The shield has pin connectors at the bottom that are 2x longer than on any other shield I've seen. Why is that?
7
votes
1answer
161 views
Ground noise and voltage drop problem
I have an RC device powered by a 3.7V poly battery, which includes a motor and a 40KHz sonar. The voltage across the sonar sensor is amplified and then adc-ed. The motor is driven by a 2KHz PWM.
When ...
6
votes
3answers
234 views
Is it valid to consider back-EMF in a DC motor equivalent to increased inductance?
I know that back-EMF can be considered as a voltage source in series with the motor which is proportional to speed. This is the common understanding, and I totally get it. Before I understood this, I ...
1
vote
1answer
259 views
Bipolar Transistor HBridge Motor Driver:
What is the importance of using the diodes shown in this Bipolar Transistor H-Bridge Motor Driver?
6
votes
3answers
197 views
Why Have Non-Zero Timing on a BLDC?
I've heard you can go faster in one direction if you adjust the timing, but do not understand why? I have a sensored bldc motor with a 30deg shift of the hall-effect sensors, tried going forward (CCW ...
0
votes
2answers
137 views
DC Motor control
I am using a DC 24v scrapped photocopier motor for a table fan.
To save energy, it's ON for 2 seconds and OFF for 3 seconds using MCU.
The fan keeps rotating during the power off state.
Is this a ...
2
votes
1answer
149 views
What is the mathematical relationship between MOSFET switching frequency (motor speed control) and motor speed in rpm?
What is the mathematical relationship between the switching frequency of MOSFET in a three phase motor controller (induction motor and BLDC motor) and the speed in rpm of the motor shaft?
-1
votes
2answers
308 views
Cheap linear actuator recommendations?
I've been doing a lot of research into linear actuators, and have come up pretty much empty handed in finding any small sized (lifting force 10-30 newtons) linear actuators for a doable price (30-50 ...
0
votes
2answers
124 views
DC Motor - Laptop Charger [duplicate]
Possible Duplicate:
Choosing power supply, how to get the voltage and current ratings?
I have a DC motor rated at 12 V which in its current application draws around 1.5 A. Currently I am ...
1
vote
1answer
58 views
Variable Reluctance Machines - what does the 6/4 or the 8/6 values mean?
I have been reading about electrical machines and keep getting these values in the examples but can't find what they actually mean. Is the first number the amount of stator poles and the second number ...
3
votes
1answer
280 views
How to Find Time Constant of a BLDC Motor?
I've done this with DC motors by determining the inductance and then computing tao = L/R where L is the inductance of the coil and R is the resistance of the coil.
Is there a best-practice way to ...
0
votes
2answers
173 views
How to choose a PIC for a BLDC Motor Controller?
I just made a BLDC motor controller, but I'd like it to be able to go to higher frequencies (have less dead time, faster firmware, etc). In particular, I'm aiming for 20kHz-to-50kHz range, but am ...
0
votes
0answers
131 views
slow speed electric motors [closed]
I am trying to motorize an outdoor spit. The spit is 6feet long and is used manually (crank handle) to cook whole pigs, beef quarters etc., loads of 50 to 200 pounds that I would like to cook at 2/3 ...
1
vote
2answers
125 views
How to determine if a motor is spinning
I am trying to figure out how much water is passing through a funnel, and to do so, I had the idea that I could set it up so the water will spin the shaft of a motor, which I have been led to believe ...
2
votes
1answer
222 views
Why does BLDC Motor Spin Slower with Same Duty Cycle at Higher Frequencies?
I have an OTS BLDC motor controller as well as one that I just made myself and both seem to be dramatically slower at higher frequencies. When I look at how much current is being drawn it makes ...
1
vote
2answers
256 views
how to add a motor to a potentiometer?
I have an old piece of analog gear from the 70s and I want to motorize the variable resistors on its panel. I don't want to replace the existing pots with motorized ones but rather to add a motor to ...
1
vote
1answer
136 views
High voltage H-bridge diode
i'm designing a varable-frequency drive with 2 H-bridges based on IR2108 half-bridge drivers. I want it to drive a 220v single-phase motor. Reading the datasheet i got a little confused on choosing ...
0
votes
0answers
182 views
First Arduino Project: Is this all I´m going to need to create a remote controlled toy car? [closed]
I´ve read a lot about Arduino projects, and I know nothing of engineering, but I would like to learn with a specific hobby project.
I know that you should start with small things, like turning on ...
0
votes
1answer
473 views
How to use a SN75441 h-bridge in conjunction with an arduino
I am trying to use a SN75441 h-bridge in conjunction with an arduino in order to drive a DC motor forward and backward. Let me describe the setup and then the problem I am encountering.
I have an ...
4
votes
2answers
281 views
Can I use a DC SSR that is switched by a PID controller to control the speed of a 12 V DC fan?
This is my first post here. Let me start by saying that I do not have an engineering background. I tinker with electronics in my spare time (Arduino, solid state low-power guitar amps, etc.), but I do ...
0
votes
3answers
170 views
Unable to find a source for rotary mirrors, how should I search for them?
Can someone suggest a source for rotary mirrors? I'm looking for something along the lines of the ones in the image below, but I'd be interested in any alternatives as well. (I'm building a continuous ...
2
votes
1answer
189 views
BLDC Motor Driver Losses
That was a pdf when originally uploaded, but am now going to try to zoom in on the sub-circuits. Please let me know if there's a better way to do this.
I'm trying to make a PIC-based BLDC motor ...
4
votes
6answers
275 views
Would a 100k ohm resistor or motor emit more heat
Would a 100k ohm resistor produce more heat than a motor that had the same resistance?
+|---------(100k ohms)---------|-
+|---------(100k motor)--------|-
Both circuits have the same amount of ...
1
vote
4answers
356 views
Can I reduce rpm further of a gear motor by using PWM?
I am working on a project where I need to move the object from one point to another in a dead slow speed , The object doesnt weight more than 5 pounds .
I found a DC gear motor with has a RPM of 0.5 ...
1
vote
0answers
259 views
How to drive dualsky ESC with arduino PWM? (Brushless motor)
I've recently received 4 Brushless motors, 4 brushless ESC's and 2 LiPo batteries. I managed to run the motors with my arduino and the servo library, but I'm not getting optimal results. I was ...
