An electrical actuator converting electrical energy into rotational motion.

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26 views

Operation of a Growler to test armature shorts

Can someone explain to me how a Growler for testing electric motor armatures works please? I have obviously read the Wikipedia Growler page but it is still foggy. So the growler unit acts as the ...
0
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1answer
51 views

High Torque Brushless DC Motors in Small Package

I have a particular set of requirements that call for a relatively high stall torque for the space available (300 ozf-in for < 8cm length of motor). The motor would be operating at a relatively low ...
0
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1answer
58 views

Calculation of base current resistor resistance for a transistor operating in switch mode? [duplicate]

I have a 9V DC motor and I want to control its speed with an Arduino board with help of a power transistor TIP120. In one of the web-tutorials the writer explains how to calculate the resistor ...
0
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1answer
59 views

How to limit motor stall current?

I've run into a dilemma. I have two motors, both with a 2.2A stall current. I know that at start up, motors will draw their stall current because they are essentially stalled. However, my motor driver ...
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1answer
37 views

What is sine wave torque constant and voltage constant for electric motors

I am wondering if anyone can explain to me what the sine wave torque constants and the voltage constants are and how to calculate them for a specific electric motor? Thanks!
0
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1answer
45 views

motor turning wrong way [on hold]

i have a change sorting machine that...of course sorts my change it worked fine until the other day now about half the time i start it it turns in oposite direction so all the change goes threw the ...
8
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2answers
539 views

Locking up a DC motor with constant supply a bad thing?

I am working on a little pen plotter project and for one of my motors (which supports the pen) I have used a small DC motor obtained from an old DVD drive. I have noticed that if I supply a constant ...
3
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0answers
61 views

Very intermittent power MOSFET failure

I am working on a very spotty motor failure (I am not the designer). We have a wound armature which is switched by power MOSFETs. These are driven by a FET totem pole type FET driver. When the ...
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0answers
55 views

No output at H bridge during quick power drop

I used a H bridge with PMW control to drive DC motor in two directions. I observed a strange phenomenon that during quick voltage drop, the PWM output at M2 is cutoff, although the T4 gate PWM input ...
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3answers
170 views
+200

Can a motor's movement be improved to any arbitrary resolution?

For a project that I'm working on, I need motor rotation at extremely small increments -- my desired resolution is about ~0.15 degrees per minimum rotation step. Of course, most motors of reasonably ...
0
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1answer
60 views

Powering a large DC motor from the mains

I scavenged a 220 volts DC motor from a large photocopy machine. How can I best get a suitable 220 volts DC supply when our local main supply is 240 volts AC? Since the voltages are so close is ...
1
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1answer
175 views

Are these H-Bridge circuits set up correctly?

I know I can use a driver chip to simplify this a lot, but I just want to make sure that I have the concept of H-Bridges down. Here they are: I have two motors, and each have 4 N-MOSFETs ...
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2answers
117 views

How do you control 130-size DC motors with an Arduino (seemingly 20A DC motors)?

I'm a little confused on specifications and limitations here... I have 3 (130-size, I believe) DC motors I'm attempting to control with an Arduino. They are running off of a 7.2V NiMH battery pack, ...
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0answers
35 views

how to calculate torque an speed in bldc motor [closed]

I have a doubt in calculating the torque an speed in brushless dc motor. And also i want a formula for calculating speed and torque with 70 kg load.
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votes
1answer
62 views

Am I misunderstanding the specs of this solar panel or electric motor?

I've been trying to figure this out, but the answers I've come up with thus far have been counter-intuitive. The solar panel's specs are as follows: ...
1
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2answers
57 views

Motor controller diagram

I have been reading about motor controllers, and I found this article online (Introduction to Motor Drives and Encoders), but I am having a hard time understanding the diagram (figure below). Can ...
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0answers
21 views

Controlling ESC with Arduino [migrated]

I want to control these motors: hexTronik DT750 Brushless Outrunner 750kv with this battery: Turnigy 2200mAh 3S 25C Lipo Pack and these ESCs: TURNIGY Plush 18amp Speed Controller. I am new to this ...
0
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1answer
33 views

What material is comonly used as insulator in laminations?

I am trying to build a brushless motor for quadcopter use, with a semi-CNC lathe and a CNC mill. I know I can buy a stator core on gobrushless or maybe other place, but I want to know if I am able to ...
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0answers
15 views

Help connecting an Arduino and an electronic speed controller [migrated]

We have this controller that we are planning to use with this motor. How do we plug it to the Arduino to make it work? This is a totally new subject for our school team, since we are mostly ...
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2answers
53 views

Commanding numerous motors with one H-Bridge

Is it possible to command more than one motor with an H-bridge like this: Would this work in real life if I replace switches with transistors and command them?
3
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4answers
135 views

How do I find the voltage range for an unknown DC motor?

I have a small unmarked motor with a burned out speed controller board. I'm able to figure out that the motor is a DC motor because it has two wires coming out of it and there's a rectifier on the ...
0
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1answer
39 views

Desired response of PI controller in motor vector controller

In vector control (field-oriented control) of motors (specifically induction motors), a rotating reference frame is attached to the rotor flux to give "DC" values in the current controller. This ...
0
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1answer
73 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 ...
0
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1answer
50 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
94 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
296 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 ...
1
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3answers
69 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
75 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
62 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 ...
0
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1answer
72 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
27 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 ...
0
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0answers
40 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 ...
0
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0answers
48 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 ...
0
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1answer
55 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 ...
0
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1answer
56 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).
2
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0answers
42 views

What mechanical parts can be attached to DYJ48 stepper motor? [migrated]

Sorry I am asking a mechanical question here, but, after all, where else people have experience with using motors? If there is a better forum for this, please do guide me. Everywhere I've seen ...
0
votes
1answer
96 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 ...
0
votes
1answer
56 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 ...
1
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3answers
133 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, ...
0
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0answers
21 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, ...
0
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2answers
53 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 ...
0
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0answers
29 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 ...
0
votes
1answer
87 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
53 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
35 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-
0
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3answers
74 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
63 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
51 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
137 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
45 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 ...