An electrical actuator converting electrical energy into rotational motion.

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1answer
119 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
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1answer
38 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 ...
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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 ...
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1answer
54 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
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-
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1answer
62 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. ...
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1answer
36 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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1answer
86 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 ...
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1answer
467 views

wiring a blender motor

So I've salvaged a motor from a blender that was not in use- the only thing is I haven't got a clue how I would wire it. I want to make sure I have the correct setup, since it operates at 230V. So my ...
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1answer
48 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
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1answer
123 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 ...
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0answers
58 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
141 views

Controlling a treadmill motor

I'm recycling some spare parts of an old treadmill for a new project. I have the motor with its driver board, the elevator piston and the controller board. All works out of the box, but I need to ...
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0answers
90 views

Gear motor with encoder: minimum drivable step

I am fancying this motor http://www.pololu.com/catalog/product/2271/specs to motorize an X-Y stage. (Alternative High rpm motors with high reduction ratio and high encoder counts/rev are welcome ;) ...
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0answers
152 views

Matching mosfets - linear servo amplifier (AB)

I'm replacing a bunch of burnt mosfets in a linear amplifier for a brushless motor. 3 phases Each phase: 3 pairs of totem IRFP240 / IRFP9240 in parallell. (no R in series) My main concern is ...
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0answers
51 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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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 ...
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0answers
974 views

How to tell whether a motor is an AC or DC motor?

I watched a youtube video http://www.youtube.com/watch?v=hT3jJRGVdW4 The man says : by spinning the motor to see whether the output is AC or DC, then it can tell whether the motor is generating AC or ...
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0answers
114 views

Use a 2N7000 in place of 2N2222A

Here's a description of both circuits. A ring shaped magnet is mounted on a brass axle and a set of bearings. Coil A and Coil B are wound on the same core. The magnet is placed about 1/8 of an ...
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0answers
249 views

Old variable speed AC motor wiring

As a disclaimer, I have a little electronics knowledge, but I'm no expert. I've been given an old 1940's Hunter fan and I'm working on fixing it up. I took the base apart and wiring is pretty bad - ...
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0answers
261 views

Analogue Hall sensored brushless outrunner motor position control

I would like to produce a low cost high power:weight servo drive using a brushless outrunner motor, like those use in radio control planes: Some of these motors leak enough magnetic flux out the ...
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0answers
142 views

SEM Permanent Magnet DC Motor DPM 30R4 1500RPM 24VDC Output: 0-25kW & Brake

I am in the plannning stages of a project to build a pig rotiessiere. I have the above mentioned motor, but I am unsure of what type of power source is needed to run the motor and what can I do to ...
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0answers
473 views

L298N shield gives relatively low ouput voltage and current

I am using a L298N shield together with an Arduino to drive a 42mm 2 phases bipolar stepper motor. The driving voltage for the motor is 12V and the logic voltage for Arduino and the L298N shield is ...
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0answers
45 views

Why do my outputs look exactly the same for the Allegro 3901?

I am trying to capture results shown in Figure 8 of Allegro 3901 data sheet . My circuit looks like this: The channels above coresspond to the oscilloscope screen captures below: In the image ...
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0answers
399 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 ...
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0answers
80 views

External Accessories for VFD

I am trying to decide what external accessories I need for my VFD 7.5 HP for a 1500Watt Vibrator motor. The three options I have come up with are below. I'm using a standard 220VAC line supply from ...
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9 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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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0answers
28 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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75 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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0answers
89 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 ...
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0answers
73 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 ...
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0answers
70 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 ...
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0answers
36 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 ...
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0answers
27 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 ...
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0answers
70 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 ...
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0answers
64 views

How to connect SINAMICS V60 driver to RaspberryPi

I have a Siemens motor with SINAMICS V60 driver (10A). Here is the Getting Started Manual (28MB PDF) . I want to connect this driver to the GPIOs of my raspberry Pi board. The purpose is to control ...
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0answers
88 views

Generating a Trapezoidal Motion Profile

I'm working on a project which involves the use of a servo motor to pull an object along a track. The servo motor will have a quadrature encoder to calculate the position. I'll probably implement this ...
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0answers
23 views

Infer the EMF amplitude of a generator from limited motor-mode data

Context: I am designing a very low speed alternator for small power devices, and I would like to select the correct motor for my application. The problem is, the cheap ones provide very little data - ...
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0answers
297 views

Control 12v motor with 5v PWM

I have 5v PWM (555 generated) and I want to control speed of a motor using it. The problem is my motor is 12v and by diving it with a 5v PWM I can't reach full speed of a 12v motor. my pwm generator ...
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0answers
114 views

Need Help in creating a driver for a 220v AC Servo Motor

I am a new to electronics and have been working on to design a Motor Drive for comonly available Serveo motors like: http://www.alibaba.com/product-gs/1580332915/servo_motor_used_in_CNC_machine.html ...
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0answers
54 views

Where can I find synchronous machine parameters to use in a PSCAD simulation?

I am trying to observe a loss of field on synchronous motors of different types and sizes. PSCAD seems to want a DQ equivalent circuit. I've Googled the problem and tried several manufacturers' ...
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0answers
42 views

Why do we use variable reluctance steppers?

AFAIK, variable reluctance steppers have non-magnetic soft iron teeth and they align themselves so as to have minimum gap I don't understand what does this line mean? How does it align itself with ...
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0answers
82 views

Which would be the best option for driving the 3/4 axis stepper motor for 3D printers?

I have researched a bit over google and reprep websites and come across different circuits/methods to drive the stepper motors. Being a student only , I have budget issues and I want it to be less ...
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0answers
297 views

How to correctly use a few 28BYJ-48 with ULN2003A and one Arduino Mega?

I bought 28BYJ-48 5 Volt stepper motor with ULN2003A Darlington Array driver. I run basic Arduino examples and some code from web. But how do I use a few motors with one Arduino? It has very small ...
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0answers
149 views

Choosing the correct brake resistor for DC motor

I have a DC motor running on 24VDC rated 150W (~6,25A), how do I calculate the correct brake resistance?
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0answers
59 views

Parts List to Replace Battery Packs?

I've purchased and installed some relatively cheap motorized blinds for my apartment. After having them for about a month, the batteries are dead on 2 out of 3 sets. Each blind has a pack of 7 AA ...