An electrical actuator converting electrical energy into rotational motion.

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122 views

Commanding a 12V DC motor with high power (~20A)

I'd like to control a 12V DC motor but it has very high power, around 20A. I was looking for H-bridges but they all support only low power (around 1A) Do I have to build my own H-bridge with high ...
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1answer
87 views

How to wire up a single-phase electric blower motor

I have an Electro ADDA C80M-2 0.75kW single-phase blower motor that I need to hook up, switched, to power a cyclonic dust separator that I've built. I thought it would be a piece of cake: pop off the ...
1
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1answer
103 views

Very slow motor [closed]

I'm looking for a very slow motor. Like half a round in a second, or even less. The movement must be as fluid as possible. I don't care about velocity variation on start or on stop, but I care about ...
2
votes
2answers
425 views

Difference between overload and short-circuit protection

What is the difference between overload and short-circuit protection for motors? I do not understand the need for SC protection when a motor has overload protection. Shouldn't the overload protection ...
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3answers
86 views

How and why is a magnetic field transmitted with alternating current?

I apologize for the basic question (or if it is incorrect in its assumptions,) but how does one account for magnetism in alternating current? If I generate alternating current to a motor, why do my ...
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2answers
79 views

Power Conducting Stepper Motor?

I have a question that I'm not really sure how to ask, so here goes: So I know there's such a thing as a power conducting slip ring motor, which I assume allows the passthrough of power through the ...
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3answers
72 views

Switched reluctance motor inverter

I've been doing some research on switched reluctance motors, and the papers are always talking about driving them with inverters. Why would you use an inverter as opposed to just using a single ...
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1answer
78 views

Two different outputs from same type of IC's

Hello Electrical engineering community. I am using motor drivers to get 5v to 12v and I am controlling each motor with each IC L293D. Each motor driver is controlling each motor and the outputs is ...
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0answers
30 views

3-phase BLDC motor operation

I salvage motor from HDD, then I started googling around how to make it spin and found this video(there are good subtitles in English): https://www.youtube.com/watch?v=CMz2DYpos8w Here he just plug ...
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0answers
41 views

Motor Driver signal

As I was taking some screen captures of the FET's drain, to ensure the back EMF was indeed within specs, I noticed my signal was not pulling to ground when the MCU would switch it off. The capacitor ...
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0answers
59 views

Boost starup of a motor with a capacitor

I have a RC car and I wonder if its startup speed will increase if I mount a capacitor in parallel with the battery. My thinking is that while the car is idling the capacitor will load. When I start ...
-1
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1answer
68 views

Calculating DC Brushless Motor Position

I am using a brush-less motor in one of my projects and I need a decent method of sensing the motor position so I know what coils to turn on and off. I looked a bit into sensing Back-EMF, but I did ...
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1answer
64 views

How can I use 15 servos with arduino mega2560 without stepping down voltage?

How can I use 15 servos with arduino mega2560 without stepping down voltage? because I want to control 15 servos by one board (arduino mega 2560).
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1answer
117 views

PIC resets when motors work

I'm using a PIC18F452 in my project, and L293d for driving motors. I'm using two completely separate power supplies for driving motors and driving the PIC. completely separate two power packs. a 12 v ...
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votes
1answer
61 views

Controlling high rating DC motor

In a robot, I need to use a (24 volts 5-7 amp) DC motor, which should be controlled by a microcontroller. Now, will I get a motor driver IC for such a motor? If not, what kind of circuit will help? I ...
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3answers
140 views

Are control systems and motors typically driven from the same source in robotics projects?

My control system is a simple microcontroller between 3.3V and 5V, but the stepper motors I require are 12V. I have ordered a 14.8V battery that I intend on regulating down to 12V to drive the motors, ...
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0answers
23 views

Precise power metering for small motor

We have a system that contains a DC motor (3 W nominal power, but generally running much lower) powered through an H-bridge from a single cell Li-Ion battery (range approx. 3.0 to 4.2 V). The motor, ...
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2answers
60 views

Best way to step down (half) battery voltage for motors

I have a 4S LIPO battery 5800mAH at 14.8V and I want to use it to power some 7.2V motors I have. The Rover 5 Chassis to be exact (https://www.sparkfun.com/products/10336), the only problem I have is ...
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0answers
31 views

Permanent Magnet Synchronous Motor Direct & Quadrature Inductance

I've modeled the following motor (http://www.evo-electric.com/inc/files/AFM-140-Spec-Sheet-V1.1.pdf) assuming a direct & quadrature inductance of 0.2mH. However, I think I may have mistaken this ...
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1answer
122 views

Homemade Brushless ESC

I am currently working on building a quadcopter with brushless motors. I decided to try to build the ESCs by myself with some MOSFETs. I am using an Uno as the main controller on the receiving end. ...
0
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1answer
56 views

Locked rotor current rating vs magnetization current

Is the locked current rating of a motor the highest current I should expect when starting a motor? Is the locked rotor current rating the same as magnetization current? If not then how should the ...
0
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1answer
51 views

PMSM inductance in DQ domain

The “abc <-> DQ” transformation matrix used for transforming currents, voltages and magnetic field can they be used for transforming inductances also? as given below-
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3answers
78 views

What type of motor is this?

So I recently bought a motorised pedicure set thinking it would be some amazing thing. However, I used it once and the batteries (4 AA) died after about half an hour and not before getting ...
0
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1answer
81 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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1answer
54 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 ...
1
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1answer
149 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
47 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 ...
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2answers
392 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 ...
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3answers
69 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
77 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? ...
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3answers
66 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
votes
1answer
114 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
96 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
162 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 ...
0
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1answer
49 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 ...
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2answers
91 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 ...
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3answers
70 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
86 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
321 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 ...
1
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1answer
73 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
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1answer
52 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
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1answer
112 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 ...
-1
votes
1answer
95 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?
1
vote
7answers
132 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
100 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
3answers
123 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
64 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 ...
1
vote
1answer
78 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
99 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 ...
1
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1answer
72 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 ...