An electrical actuator converting electrical energy into rotational motion.

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3
votes
2answers
718 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. ...
2
votes
1answer
108 views

Controlling speed of motor through L293D using TLC5940NT

I am trying to control a DC motor through an L293D. Ultimately I am controlling it with an Arduino, but I am trying to use a TLC5940NT chip as an intermediary to increase the number of outputs that I ...
0
votes
1answer
25 views

If interpoles are used in DC motors and reduced the entire armature flux then how is torque induced in the motor?

If interpoles are used in DC motors and reduced the entire armature flux then how is torque induced in the motor?
0
votes
1answer
58 views

Sharing the Seeeduino LiPo with a motor controller

I'd like to use a Seeeduino to control a small DC motor to wind/unwind a thin cable which will be lifting a small door. Ideally, I'd like to use the same LiPo that's being used to power the ...
1
vote
5answers
73 views

What type of motor can provide smooth motion at low speed around 0.1 to 1 mm/s

I am building a stage for tissue cutting and the motion of the stage should be very slow and smooth. The speed range is 0.1 to 1 mm/s. I got a stepper linear motor from PI (M230.10s), I test its speed ...
0
votes
2answers
60 views

How do you power 6 servos

I have 6 MG996 series servomotors. A single motor can be controlled by an Arduino board using a 5V power supply. Some specifications Running Current 500mA - 900mA @ 6V Stall Current 2.5A @ 6V ...
0
votes
1answer
37 views

Torque and Back EMF Waveforms of Brushless Motors

For simplicity, I'm going to be talking about a single stator phase. I understand that torque is proportional to current, and that back EMF is proportional to angular velocity. However, after ...
0
votes
1answer
47 views

Motorised blind controller schematic - do I need to protect ICs with resistors?

I am making a simple motorised blind controller, which I want to have a "safety cut out" when it gets to its fully closed/fully open state. (So the user doesn't strain the motor keeping their finger ...
0
votes
1answer
47 views

What kind of protections are needed to control an AC motor (230 V) using a microcontroller?

I need some guidance with surge-protection of the SSR and also how to safely bring the motor to stop (since it's an RL load, the inductive current has to die out). I found a schematic online, but have ...
0
votes
0answers
50 views

Can I use Cat5e cable to carry 12V and signal for Raspberry Pi project?

I'm doing a "home automation" project with a RPi at the center. It's to do various things including a) controlling lights using PIRs, and b) automating a motorised blind. The blind is opened / closed ...
27
votes
9answers
21k views

Why does a Tesla car use an AC motor instead of a DC one?

I was just watching a mega factory video and wondered why they use an AC motor which requires a power inverter instead of DC which may be powered directly from their DC battery? Introducing an ...
1
vote
1answer
54 views

Beam sensor or other switch needed for electric blind project

I am designing a motorised blind (powered by a Raspberry Pi) and need a reliable way of detecting when the blind is fully "up" or "down". I don't want to use a stepper motor, and rely on counts, as I ...
0
votes
0answers
60 views

Trying to figure out what type of mechanism would work for this part I'm building

First time posting here, sorry wasn't too sure how to phrase my question. I had originally looked for a mechanical engineering stackexchange page but since none exists yet and the device will likely ...
2
votes
1answer
105 views

Electric motor will only start turning at lower voltages

I have a tiny DC motor directly connected to this power supply. The motor starts just fine when the supply is set to 4.5V. I can then change the voltage to 6V and it continues to run just fine. ...
1
vote
1answer
63 views

Upgrading a treadmill controller / console [closed]

So I have an older model treadmill that I would like to upgrade if possible. The newer treadmills roll to a stop very elegantly, whereas this older model just switches off. Also the console is old, ...
0
votes
1answer
61 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 ...
0
votes
2answers
128 views

Motor/driver for smoothest and most constant speed

Which type of motor/controller can maintain the smoothest and most constant speed in the range 300 - 1000 rpm with minimal vibration? ie: low cogging torque, etc. I have an application in mind which ...
0
votes
1answer
34 views

When do I have to use rectifier-inverter, and when is “dimmer circuit” sufficient in driving AC motor?

I'm trying to design a device that is to use a variable speed 1-phase AC motor. I still haven't decided upon power and other parameters of the motor. I have a few models to choose from, with "bigger ...
0
votes
1answer
45 views

PSC motor driver circut using relay

I am working on a project in which i need to connect Permanent Split Capacitor(PSC) AC motor using relays as shown in the below block diag fig 1. I want to rotate it in both CW and CCW direction. It ...
0
votes
1answer
94 views

Motor Control For Overload

I am using PIC 18F45K80 for four phase dc motor control operation. The maximum load current is 30 Amps. If it exceeds 30 Amps, I have to call stop_motor() function in my coding in order to switch off ...
0
votes
2answers
77 views

How to select most efficient motor for generator?

First post. Please forgive me if this is a stupid question. This post can be broken down into two questions. I am building a bicycle generator, but am new to the field of EE. I am trying to select ...
2
votes
3answers
113 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 ...
0
votes
1answer
49 views

3 Phase Motor Rectifier

I have a Turnigy Rotomax 50cc engine and I am trying to rectify it. I don't know whether it has delta or a wye winding style but I suspect that it is delta(Left Picture). This is what I have so far: ...
0
votes
0answers
25 views

Proper motor for a fan/propeller to be used in a permanently installed sculpture

I am designing a sculpture with some moving parts and one of those parts is a rotating fan or propeller-like vane connected to a motor (it will be a light plastic part of ca. 20-25 cm. of diameter, so ...
0
votes
1answer
26 views

Bipolar Stepper Motor Voltage Problem [duplicate]

This is My Circuit: When I Connected Motor X1 and X2 Voltage accross X1 and X2 10mV. When I Connected to X1 and X2 a serial 7K res, Voltage over Resistor 150 mV.(Motor Not Connected) When I ...
3
votes
1answer
233 views

Making a controllable H-bridge

UPDATE I found out the issue. Specifically, the PNP transistor I got. I used a BC557 - for some reason its collector-emitter current is very very low. It does open when the base-emitter junction goes ...
0
votes
1answer
65 views

24v 450w DC motor powered electric bike connected to a lith-ion battery pack (56v 6.5a)

How do I prevent the DC motor from burning out using this battery pack?
1
vote
1answer
50 views

motor Back EMF phase differences

I am reading though a product manual for an amplifier that I am working with. It says that if you view the motor Back-EMF while it is disconnected from the controller and spun in a clockwise direction ...
0
votes
1answer
58 views

CX-20 Quadcopter Part

One of the ESC's on my quadcopter is missing a component. I am unsure what this component does or where to find a new part. Is it a sort of resistor?? What size? it features no markings that I can ...
2
votes
2answers
92 views

mechanical load of an alternator

I'm wondering about alternators used in automobiles and the mechanical load that they present to the engine. My question is: what is the relationship between the mechanical load presented by the ...
0
votes
3answers
59 views

Measuring the Internal Resistance of a Brushed DC Motor for Use in Speed Control (IR Compensation)

Is measuring the internal resistance of a brushed DC motor with a multimeter the correct way of doing it? The resistance seems to vary while the motor is being turned by hand; however, the resistance ...
1
vote
4answers
98 views

Triple pole triple throw relay

I have a turntable which rotates cw and ccw. This turntable is rotated by AC synchronous motor of 230V. I want to be able to rotate the turntable with Arduino. For this reason I need to control the ...
6
votes
2answers
756 views

Why would DC motors be preferred over brushless AC induction motors for cable cars propulsion?

According to this article San Francisco cable cars system uses a set of traction cables driven at constant speed and each car can connect to the cable when its operator want the car to move and ...
4
votes
2answers
108 views

Electronic Speed Control Concepts

I am a programmer who has never worked with electronics before. I am learning the concepts and hoping to build a quadcopter, with the control software entirely written by me. Motor control seems to be ...
-2
votes
2answers
102 views

how can i calculate if my motor can drive me uphill? [closed]

Well i'm building something on my free time and I want to buy an engine and I would like to know if it is strong enough to carry me uphill. Is there a formula i can use? This is what is know to me ...
1
vote
1answer
107 views

Running brushed universal motor at different frequency than designed

First, the end goal is to run a power tool (namely a Dewalt DW734 thickness planer) designed for 110V at 60Hz at a country where the power is 220V at 50Hz. The motor is a brushed universal motor, ...
0
votes
2answers
51 views

Which force moves the armature of an electric motor?

As I understood the tangential force F on a current-carrying conductor in a magnetic field makes the armature of a electric motor move. But actually the groove where the conductor is located in is ...
5
votes
2answers
973 views

How many control pins needed for L298N H-Bridge?

I have a simple robot with two DC motors. Using the L298N Dual H-Bridge, what's the minimum number of control pins I can use to give me forward, back and turn? Here's a typical setup for the chip. It ...
-1
votes
2answers
47 views

is it possible for a battry to provide to many watts to a dc motor [closed]

is it possible for a battry to provide to many watts to a dc electric motor. the motor is 36v 250w internal resistance is unknown, the battery is 3-12v 10a sla battries connected in series
9
votes
6answers
11k views

Very Slow Electric Motor

A customer has asked: I want to slow down a small hobby sized DC motor to a user variable range that runs from slow to zero RPM. I would simply use a wall wart for a power supply and a ...
0
votes
0answers
24 views

Help in choosing an electrical motor

As a dad to a newborn girl that calms down and falls asleep only when rocked vigorously in her crib or pram, I thought that it could be a nice idea to automate that process. I have a couple of ideas ...
2
votes
1answer
64 views

12V motor running with 24V L293D H-bridge

I have two 12V motors (300 RPM) running from a L293D H-bridge circuit. I find that the speed when I provide 12V is not satisfactory. Will it damage the 12V motors if I provide 18V or 24V? Will they go ...
1
vote
2answers
46 views

simple motor driver wouldn't work

I am using ATMega164PA as the microcontroller running at 8MHz on 3V coin battery (current battery voltage 2.5V). I am trying to turn on tiny coin vibration motor rated 3V, 90mA using ZXMN10A07FTA ...
1
vote
2answers
100 views

6V DC Motor Overheat

I am totally new to electronics, so be patient with me please, it is very basic question :) I have a 6V DC motor which I reused from an old device, that means I don't know its specs. I connected it ...
0
votes
1answer
40 views

What is meant constant voltage control of h-bridge

I am using LV8075LP as the h-bridge to drive small 3V, 90mA coin vibration motor. I came across a few terms that I need to understand. Constant voltage control Output full drive Also, can I use ...
0
votes
3answers
180 views

How to troubleshoot soldering issue?

I have circuit working perfectly on a breadboard - motors are spinning as expected. But same circuit with same components is not working when I soldered it - motors barely can spin (you hear buzz ...
2
votes
1answer
77 views

How does vibration motor create motion in particular direction?

I am building an autonomous robot for robot swarm reasonably small in size (say 30mm x 30mm). I was analyzing such robot's locomotion and found that coin vibration motors are used widely as opposed to ...
0
votes
0answers
58 views

How do I find power flow and shaft torque of induction motor?

A 50Hz induction motor has a synchronous speed of 3000 RPM. The motor has 2 poles and is initially running below the synchronous speed. An external force is applied and the motor is now rotated at ...
1
vote
1answer
78 views

Level Shifting & Amplification

I am trying to design a crane load (Weight) measuring unit using motor current measurement technique. For some reasons we can't use load cells here. Part of schematic I have drawn here An air core ...
15
votes
3answers
1k views

Why do refrigeration compressors stall when switched off and on quickly?

All of the air conditioners I've worked with have the following words on them: Before restarting, wait three minutes. In the event the air conditioner's compressor is switched off and back on ...