An electrical actuator converting electrical energy into rotational motion.

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2answers
125 views

Overload relay nameplate

The following information appears on the nameplate / description of an existing thermal overload relay (for motor protection) I need to replace with a modern unit of same functionality: IEC 292-1 ...
2
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1answer
186 views

MOSFET Driver Stress

I am using an Allegro Microsystems A4935 3-phase MOSFET driver in a brushless speed controller. I recently got the motor spinning, but when I began increasing the voltage, my commutation started to ...
1
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1answer
167 views

High voltage (70V) amplifier

I need to generate a 400Hz 26V rms signal with at least 200mA drive capability. 26V rms means 72.8V p-p is required. It is to drive the rotor winding on a synchro system. I was planning to use 2 x ...
1
vote
1answer
427 views

What happens if we run 415V 3 phase motor running on full load on to a 240V 3 phase supply?

I have a 415V 3 phase motor, but during emergency situation a 110V DC to 220VAC 3 Phase inverter comes into place. What will be the effects on the motor
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1answer
178 views

DC motors, AC motors, and Kv

As I understand it, DC motors have Kv values because their speed is determined by the applied voltage. AC motors don't have Kv values because their speed is determined by the frequency of the AC ...
-2
votes
1answer
415 views

Arduino UNO not working with L293D

I am creating a simple robot that is controlled by an Arduino UNO, and given instructions by a button matrix. One can press 4 buttons for Forward, Backward, Left and right on on the matrix array, ...
2
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0answers
439 views

Monster moto shield + Arduino +Pololu 12V, 29:1 Gear Motor Encoder hardware problem

Overflow enthusiasts! I am trying to build a balancing robot with two wheels, using the polulu gear motor as mentioned above. In order to have a strong motor driver,the monster moto shield is used in ...
2
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0answers
249 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 ...
2
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0answers
137 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 ;) ...
1
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0answers
55 views

Using a fruit or salt-water battery to power a motor

I´m trying to build a fruit or saltwater battery to power a motor. From my 8 cell saltwater battery connected in series, I get a reading of 5V or so and 2-3A... but it won´t fire up my 5V DC motor. ...
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0answers
36 views

Purpose of resistors from phase to phase on 480V motor

I have inherited a project with a motor circuit that I cannot figure out the purpose of some resistors. It was initially designed for operation in Europe at 400V 50Hz. Since it is operating here in ...
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0answers
29 views

Measuring and classify stepper motor

Hi guys I've got a little projet running and need your help: I am going to use a stepper motor and a motor driver, in my mind that should work (maybe with a heat sink for the driver). What do you ...
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0answers
41 views

Is this motor suitable for my project?

i have a project which have 4 18volt DC motors, each motor rotate a screw which is 8mm and pitch 1.25mm and 200mm length vertically, load connected via nut in screw, every motor has 3.5 KG load and ...
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0answers
65 views

What is the differene between zero leading and zero lagging?

The armature reaction of an alternator will be completely magnetising when load power factor is A unity B zero lagging C zero leading D 0.8 lagging Though ...
1
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0answers
192 views

In field controlled dc motor, why does the armature current remain unchanged even if it is affected by field flux?

Basically in a field controlled dc motor, the armature current is kept constant (via some constant voltage source) while the field current is varied which will vary the field flux and interacts with ...
1
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0answers
79 views

AC relay switch-off optimum phase?

I have a circuit which turns a 230V 50hz AC motor on and off by use of a relay. I've tried to arrange it so that the relay would be turned off when the current through the motor is zero. Of course, ...
1
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0answers
130 views

Draw relation of rotation speed and output power of PMAC generator with brake resistor

I would like to draw a graph showing the relationship between rotation speed and power of an ideal Sinus PMAC generator with a brake resistor R(load) to be defined controlled via a 4Q Controller ...
1
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0answers
60 views

AC Motor operating region

I've been using an ABB IRB 2400 robotic arm to gain experimental data and write a report based on the data. I found that when I operated it at different speeds for pre-programmed paths, I got a ...
1
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0answers
73 views

How much has the power density of electrical motors and generators changed in recent decades?

I would like to know how much lighter (if at all) a matched combination of an electrical motor and generator with a given power output would be today, compared to a similarly powerful combination ...
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0answers
97 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 ...
1
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0answers
231 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 ...
1
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0answers
1k 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 - ...
1
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0answers
875 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
57 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
13 views

Controll Motor-DC using PWM in Proteus and MikroC for PIC

I am beginner (10 days) in Proteus and Mikroc, but i prefer to learn and this is the reason for my post. I build a project using PIC16F917 and Motor-DC with L298 driver. I command motor to start ...
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0answers
16 views

DC bushless motor position tracking in gimbals

I see that gimbal motors often are DC brushless, like this one. However, how is position tracking done? There doesn't seem to be sensors integrated and they only have 3 wires (3 phase?). Position ...
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0answers
29 views

Low-stroke, high-force linear actuator solutions with one dimension below 5 mm?

Scenario: I am working on a wearable actuator that requires an output displacement of 3 mm at 30 grams-force throughout (preferably more early on) and occupies at most 5 mm in the Z dimension. The X-Y ...
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0answers
49 views

Why won't my motor move from my Teensy 3.0?

I'm using the simple example exactly from here except I've changed pin 4 to pin 10 and instead of using an arduino I'm using a Teensy 3.0 However I cannot get it to work, the motor never starts ...
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0answers
34 views

Hacking a self balancing scooter wheel/motor

The wheels/motors of self balancing scooters seem to offer great opportunities to hobby robotics. The motor is completely housed inside the wheels, the motor seems powerful & are pretty cheap ...
0
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0answers
30 views

Explain please this half bridge circuit by ChaN

I'm analyzing ChaN's passive stroboscope project and have some troubles in understanding the motor bridge circuit: Here the full circuit. I don't understand why need C3, D3 (both), D4, and L2. And ...
0
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0answers
33 views

What type of motor is it that I am after?

I would like to actuate a linkage using a motor from one end. Meanwhile, this linkage can be manually actuated from the other end. I would like to use a 12V motor which I can use to actuate the ...
0
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0answers
26 views

Piezomotor control

I'm trying to control a piezomotor, here is his datasheet, and drive it with the TMC261, however I've read that a piezomotor requires a sinusoidal wave so an DAC in indispensable but also I've found ...
0
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0answers
19 views

drv8833 motor driver with lipo-2s problem

I am using a drv8833 motor driver for brush motor and i have one problem. When i'm connecting its VIN and GND to powerbank battery, brush motor to BOUT12 and BIN12 to atmega 328p, setting BIN1 to '1' ...
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0answers
62 views

ringing shunt resistor on induction motor

I'm working on a three-phase AC induction motor driver. The main supply is 48V and I plan to operate in the 0-40A range. The six MOSFETs are driven by PWM signals via a gate driver. The PWM signals ...
0
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0answers
17 views

Driving LRA actuator with a driver

I'm using a driver DRV2605L to drive a LRA from the link below. https://catalog.precisionmicrodrives.com/order-parts/product/c10-100-10mm-linear-resonant-actuator-4mm-type The problem is that the ...
0
votes
0answers
172 views

electric wheelchair

I'm making an electric wheelchair . I want to lift a total weight of 100kg on it with a max speed of 4mph. So help me choose appropriate motors(dc geared , stepper, or .....) and batteries (12 or 24 ...