# Tagged Questions

An electrical actuator converting electrical energy into rotational motion.

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### what is the Relation of Motor Starting capacitor with Motor speed?More 2 questions in Desc

Pre-Knowledge: I know we use capacitors in Single phase induction motor because with one phase the the net torque is zero and Rotor won't rotate so we add another winding perpendicular(with capacitor) ...
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### 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 ...
189 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 ...
470 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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### how to measure ac motor with AC ammeter

I have 3 different working motors ranging from 1kw to 2 kw (on 220V AC, 1 phase), they all use running capacitors. I tried 2 different AC ammeters on them and I get bad readings between 0 to 1 amp, ...
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### 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 input....
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### 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, ...
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### Asynchronous motor with motor capacitor sometimes won't run backwards when it should

The long story short: Is there any chance that an asynchronous motor with a run (or start?) capacitor fails to run backwards when the capacitor ages and loses a significant portion of its rated ...
536 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 ...
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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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### 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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### What are the advantages of controlling an ac pm motor in abc or qd0 reference frame?

let's refer to the following (vector) control schemes: Qd0 is the synchronous reference frame, with d alligned to the pm magnetic field. the system is balanced and symmetric (so no 0 component). ...
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### 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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### 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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### 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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### 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 ...
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### 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, ...
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### 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 ...
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### 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 ...
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### 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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### 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 ...
246 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 ...
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 - ...
908 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 5V....
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### 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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### 3 phase motor amplifier

I have generated a 3 phase variable frequency single. Now I want to drive a motor. Is there a type of ready built amplifier module available to drive a motor from a 3 phase sine wave input? All the ...
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### Class D Amplifier

For a piezomotor control I've used a class D amplifier TAS5162. PWM is provided directly to it with a microcontroller. I've made the same circuit as mentioned in the datasheet but instead of getting ...
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### Linear (non-stepper) motor control with stm32f4

I have a linear motor equipped with a sensor, such as is used in the printer. My task is to set the desired position with two switches, and with the third switch to drive off the motor in this ...
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### Blower (Fan) Capacitor on Water Cooler

I've got a water cooler that has a centrifugal blower inside it. The blower fails to start most of the time, but I've verified that the motor works because it starts with a slight nudge. A slight ...
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### How to implement a BLDC for variable torque in its phase (InstaSPIN, TI)

By chance I read this patented method to control the rotor pitch without a swash plate usually a helicopter, by adding two parallel hinges on each blade root. When add torque to spin it the pitch ...
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### 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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### 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 ...
57 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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### 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 ...
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 ...
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### 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' ...
66 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 ...