An electrical actuator converting electrical energy into rotational motion.

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1answer
39 views

Load sharing using asynchronous motors

I am involved in the design of a system composed of: multiple asynchronous motors, each equipped with separate drive, all acting in parallel on a load, via a common rack and pinion transmission. ...
0
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0answers
20 views

Using shielded cable on an ebike hub motor, what ground to use

I have been having strange issues with an ibike that I have built, in that interference keeps being generated from the motors phase wires into the RX/TX lines on the hall sensors. I have been advised ...
0
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2answers
43 views

Detecting a threshold position in movement

I am raising an object/platform up and down using a DC motor connected to a threaded rod. I wish to know exactly when the top of the object reaches a certain threshold point during its movement, sort ...
1
vote
1answer
113 views

Why is there a resistor inline with switch in blender motor?

Our hand-held blender stopped working and I took it apart to see if I could fix it (no, as it turned out). The circuit was simple; a switch and a 0.47 Ohm (R47) resistor in series with a full bridge ...
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2answers
58 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 ...
1
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2answers
60 views

Slow down stepper motor's speed using stepper driver DRV 8825

I've got a Nema 17, rated at 0.8Amps, stepping angle of 1.8 degrees. The motor looks like this, and has six wires coming out of it: The four wires I've used are the ones labeled below (I was ...
4
votes
1answer
575 views

Reversing direction of a 115v ac motor using Arduino

I have a 115V brushed motor that I am controlling via Arduino. The manufacturer says it draws 1A but I'm not sure if that accounts for the initial current draw to turn it on. I've had great ease and ...
1
vote
1answer
65 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
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0answers
54 views

Diy inrunner motor? [closed]

Could an inrunner be made within 2.5"x9" and also have 150 or less kv and still be capable of roughly 800watts on 6s(24volts)....and not burn up? If so I'm into it if any of you have any advice or ...
0
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3answers
59 views

Motor controller - transistor taking up 3/4th of the voltage

I am trying to make a motor controller for a DC brushed motor. The design is fairly simple, see below - motor represented by inductor The problem I am having is that if we imagine A to be HIGH and ...
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0answers
71 views

I want to make a motor for my skateboard

Could a squirrel cage motor that was roughly 2.5"x10" handle the roughly 700 watts needed for an electric skateboard with just ambient cooling? Would it have the torque necessary with no gearing? ...
0
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3answers
52 views

Two sequences in order, one button push

I am inexperienced in the field of electronics and don't yet understand diagrams and things alike, but I have a specific need and would appreciate any help you can provide. I am constructing a ...
2
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1answer
68 views

MOSFET H-bridge design

given the circuit below to be used as a H-bridge with AVR PWM. Is this a good desing to use? What can you recommend? I already built something like this but without the resistors. ( and so burned ...
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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
81 views

Why doesn't this relay circuit work?

Objective: A device to prevent automatic restart of a motor (or pump) after power failure. Background: It is well known that aquarium fish are curious and will explore items in the tank. In the ...
3
votes
2answers
129 views

How to protect a P-channel MOSFET when driving a motor?

I want to switch a 12 V DC automotive fuel pump in a bench test rig using a P-channel MOSFET, as follows: simulate this circuit – Schematic created using CircuitLab This is a simple ...
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 ...
0
votes
1answer
24 views

Clock / timer activated 2 second voltage timer for wiper motor project

Ok, I need a 12 volt voltage timer using clock or timer for a wiper motor. I am working on a project in my garage. Simply put, I am wanting to use a wiper motor that will open and close a spring held ...
7
votes
4answers
29k views

How are current and voltage related to torque and speed of a brushless motor?

I know that electric vehicles have different performances depending on battery and motor, but it's not clear how electrical and mechanical units are related. Can anybody please help? Will a 100V ...
1
vote
2answers
79 views

Suggestion regarding position sensing in a motor operated shaft

I'm driving an 24V DC motor through an H-Bridge back and forth, in order to position a part of my mechanical app. The motor actuates a shaft which has the said part moving according to the shaft's ...
0
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3answers
55 views

Repair automatic perfume dispenser [closed]

I'm a total newbie on electronics. All I'm able to do is just connecting broken cable here and there :p So this might be dumb question, but I hope it' still the right place to ask this question Now ...
1
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0answers
82 views

Capacitor bank with variable speed motor

I have a set of three pumps (power ~100 kW) with variable speed AC motors and I would like to know the best option(s) to reduce the cost of reactive energy. For instance, would it make sense to ...
2
votes
3answers
167 views

How to power a 1.5V motor with a 3V source?

I just started getting into electronics so I'm still a major noob. Any help would be much appreciated! I have an Arduino UNO and have made a few basic circuits with LEDs and a small speaker using ...
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7answers
107 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 ...
3
votes
1answer
490 views

DC motor vs AC motor weight considerations

For a given power rating, does a permanent magnet DC motor have a weight advantage over either a three phase permanent magnet synchronous machine, or vice versa? Or does it work out that they would be ...
0
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1answer
115 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 ...
1
vote
1answer
54 views

Suppressing BLDC Motor noise? Is it radiated or a grounding issue? [closed]

I have a BLDC motor that rotates an imaging assembly(ultrasound) and alot of PWM noise can be seen in the resultant image produced. If I play around with the RX line that carries the imaging signal ...
0
votes
1answer
37 views

Field oriented control motor controller: is the measured Iq rms or the peak current? [closed]

Say the regulator regulates Iq to be 1A, is the actual motor current 1A RMS or 1A/sqrt(2)=0.707A?
0
votes
1answer
68 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
1answer
63 views

How to supply multiple 12V DC 3 amps motors?

I need to supply four DC motors 12V @ 3 amps with a battery pack. I was wondering which characteristics should have an hypothetical battery pack to supply all four motors together. How many volts ...
3
votes
2answers
764 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
121 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
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1answer
30 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?
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1answer
64 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 ...
0
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2answers
75 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
57 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
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0answers
61 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
23k 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
61 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
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0answers
65 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
109 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
70 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
2answers
133 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
36 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
53 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
2answers
101 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
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 ...
0
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0answers
28 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
29 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
241 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 ...