The Stack Overflow podcast is back! Listen to an interview with our new CEO.

Questions tagged [vfd]

Variable frequency drive, a three-phase AC output motor controller. Questions about vacuum fluorescent displays should not receive this tag.

Filter by
Sorted by
Tagged with
18
votes
5answers
11k views

Tesla Car “maximum torque at 0 RPM” - is this correct?

Tesla Model S Wiki I've been watching youtube videos on this car, and everyone states that the crazy accelleration is due to maximum torque at 0 rpm. Doing further research, this car uses an AC ...
0
votes
1answer
162 views

Which terminal do I hook the panel ground wire to on my VFD?

Have the TECO 7300CV - 220v single phase in, 220v three phase out. The manual clearly shows the motor ground connection going to the "PE" terminal but it does not show the source / panel ground ...
1
vote
2answers
96 views

How can earth fault meter work through inactive IGBTs

I have a setup with a Bender IRDH375 connected to the DC bus of an IGBT based inverter. If I connect a 50kOhm resistor to earth while running the inverter, it detects it well. That part is reasonably ...
0
votes
2answers
124 views

Advantage of PWMs over an Oscillator based Induction Motor Drive

Variable Frequncy Drives commonly use pulse width modulation to generate frequencies for driving induction motors via the use of microcontrollers. Is there any advantage to using MC based PWM signals ...
0
votes
1answer
366 views

I too want to wire a 3 phase motor to a VFD. And the question has already been asked but

How to wire 3 phase motor to VFD http://i.stack.imgur.com/KmuB3.jpg My Baldor vm3556t 1hp motor shows the same wiring as the photo above and the wires are bundled as shown on the low voltage side. My ...
1
vote
3answers
4k views

The leads of my 3-phase motor are incorrectly labeled. How do I determine the correct labels?

I connected my new-in-box 3-phase motor to my new-in-box VFD, following the instructions in both manuals and the wiring diagram on the name plate (low voltage configuration). With the power off, the ...
0
votes
2answers
189 views

Filtering kHz noise

I have a variable frequency drive (VFD) that switches at 3kHz, according to the datasheet. I also have a sensor that has a pulsed 5V signal output. Here are the three data points I've collected: VFD ...
0
votes
2answers
561 views

V/f Constant control for single phase induction motor?

I am implementing a Variable frequency Drive control of single phase induction motor. I am little bit confused about the V/f ratio and voltage level. i boosted voltage upto 380V for Inverter . if i ...
3
votes
1answer
5k views

Can you use a vfd to run a capacitor start motor?

I've read on many forums, publications and specification sheets that it's not possible to run a capacitor start motor using a VFD. The start winding of such a motor is momentarily powered until the ...
2
votes
1answer
4k views

What functions do EMC filters in variable frequency drives serve?

Most VFDs I've seen have EMC filters in them, though in many cases they're optional or can be disabled by the user. Exactly what function do these filters perform? What problem are they intended to ...
2
votes
6answers
505 views

Controlling the frequency of AC used to energize an electromagnet

I am trying to build an electromagnetic pendulum which essentially has a pendulum arm with a permanent magnet at its end which is 'kicked' by an electromagnet placed at the mean position to drive the ...
1
vote
1answer
193 views

VFD Power Savings physical explanation - cubic vs square relationship

I am trying to either explain or derive where the power savings come from with a variable frequency drive (VFD). I am well aware of all the literature and generally accepted assumption that energy ...
1
vote
2answers
815 views

From PWM Output to Large Motor Control

This question stems from my own curiosity, so forgive any vagueness. Imagine the following scenario: We have a MCU which outputs a PWM signal to control a motor's speed and direction. We ultimately ...
0
votes
1answer
3k views

CAN protocol : How to start with CAN interface with Microcontroller [closed]

I want to communicate with VFD (variable frequency drive) via CAN open protocol. I have never used CAN before. So can anyone Guide me from where Should I start with ? Any link or Suggestions would ...
0
votes
1answer
90 views

Does the RoHS standard apply to variable frequency drives?

I'm having a bit of a disagreement with a customer about whether RoHS applies to variable frequency drives and comparable equipment. This is complicated by my understanding that RoHS is being rolled ...
0
votes
1answer
129 views

Starting the VFD from a specified frequency instead of 0 Hz [closed]

I have Hyundai N100 inverter. PLC is sending 0-10V analog signal to the inverter. It starts from 0 Hz and then reaches the maximum frequency of 50 Hz. Now i want it to start from 40 Hz instead of 0 Hz ...
3
votes
3answers
345 views

Motor Induction motor design specifics

I wanted to know the difference between the motor(s) used in the Tesla Model-S and commercially available motors. a busy cat http://insideevs.com/wp-content/uploads/2014/12/Screen-Shot-2014-03-09-at-...
0
votes
2answers
57 views

Why there is continuous variation in output frequency of a Hitachi Inverter (L100 Series)? [closed]

I am using a Hitachi L100 Series inverter and its frequency source is Keypad Potentiometer. During run it is continuously changing the output frequency which is displayed on the Operator Display ...
1
vote
1answer
470 views

variable frequency three phase AC

I want to generate 1-150Hz+ three phase AC. Output voltage at maximum frequency would be around 240VAC and current around 40A. I have a few 60Hz three phase induction motors, drive shaft coupler, and ...
-3
votes
1answer
294 views

Is it possible to drive a PMDC motor with an AC VFD?

I wish to run a PMDC motor of 2.2KW with AC VFD but am not sure if it can be done. I am not an Electronic/Electrical guy. Any suggestions will help.
0
votes
1answer
156 views

Is it possible to over-power a 3-Phase AC motor with a AC Controller?

If I have a 200kw motor controller, and a 30kw motor, is it possible to overpower the motor with the controller? My application is for an electric vehicle (golf car, small bicycle, and so on). I'm ...
2
votes
4answers
844 views

How to control a blower using the analog output from a PID controller?

I built a biomass burner which is powered by a blower. For precise control of temperature I am using a PID controller PID500 from a company called selec . I passed the PID analog outuput to a VFD ...
0
votes
2answers
243 views

Can we use a power amplifier (Class AB) in the inverter portion of a VFD?

I would like to float this idea of using a good (audio) power amplifier in the inverter stage of a sub 1KW VFD. How does this idea sound ? On the plus side, there is far less switching noise, since ...
0
votes
2answers
170 views

Confusion in a VFD manual

I'm using the following VFD for a 3-phase AC motor: ACS550 user manual I want to monitor the power consumed by the motor and the actual rpm. On page 28 and 78 it meantions: • Analog output AO1: ...
2
votes
1answer
310 views

Are there reasons besides audible noise to run a VFD at a higher carrier frequency?

VFDs - variable frequency (motor) drives - output a pulse-width-modulated carrier approximating a sine wave. The carrier frequency is typically variable. I've seen numbers as low as 1 kHz, and as high ...
0
votes
2answers
63 views

Will a PWM-Enabled MCU Work With Any Motor?

Why do so many MCUs specify what kind of motors they work with? For example: http://www.microchip.com/pagehandler/en-us/technology/motorcontrol/ Surely, the MCU has no concept of a motor and it ...
0
votes
2answers
1k views

3 phase VFD/rheostat for motor

I have a 3 phase motor and 3 phase power supply (400V, 50Hz) Currently this motor produces 1.5hp in torque and ~1750rpm. I need it to produce less. My question is: Is the best way to go about this, ...
0
votes
1answer
109 views

A single pump controlled by a VFD

We're testing a 110V single phase Variable Frequency Drive(VFD) connected to a single pump having randomly let's say: R= 10ohm, L= 50mH. And I am putting these numbers to fiqure out the relationship ...
7
votes
1answer
1k views

How do I properly size components for an EMC filter for a variable frequency drive power supply?

One of the products my company designs is, essentially, common bus power supplies for variable frequency drives (VFDs). Thus far we have only sold into the United States. We are considering selling ...
0
votes
2answers
14k views

What is the relation between the stator current and motor rpm for an AC motor?

A 3 phase AC motor is rated values are: 970 rpm, 50Hz, 380V delta 47A. A VFD drives this motor for obtaining a constant wind-speed which rpm is proportional. The thing is when 885 rpm the stator ...