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Questions tagged [vfd]

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

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2answers
238 views

Slip ring (wound rotor) 3 phase motor, what VFD should I use? [closed]

I'm trying to solve some puzzles around the electronics of an amusement ride. It's basicly an old carousel with a wave-like pattern (3 tops/downs along the circle) that i'm restoring. (So that you ...
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4answers
114 views

Does this type of Dual Voltage AC Drive exist?

The goal is to run a 3ph AC motor with either high or low voltage inputs. The motor would be wired for a specified voltage and the controller drives a single output regardless of the line voltage. I ...
0
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1answer
73 views

why fs25r12w1t4 infineon module is burnt out when high current is paassed through it?

I am implementing a VFD for Induction motor drive. I have used fs25r12w1t4 Infineon IGBT module ( 1200v 25A) with gate driver 6ed003l06-f2. It always burnt out when I passed 2A current. What may the ...
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2answers
2k views

Condition for max torque

My questions are these: If say a 3ph motor connected to a mains supply is rated at 1400 rpm with no load at what rpm approximately does it produce its max torque? If the same motor is run with a VFD ...
0
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2answers
52 views

Powering three separate shaded pole axial fan motors with one 3-phase VFD

I want to power and control the RPM of three 115v .47amp shaded pole axial fans each powered by a separate leg of the 3-phase coming from a VFD. Can it be done? I'd like them to run at full speed (...
1
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2answers
219 views

Should a frequency-controlled motor use a circuit breaker with a B or C trip characteristic?

In our company, a discussion is raging on whether a motor with a frequency controller should be protected with an automatic circuit breaker with B or C characteristic. The B-camp's argument is that, ...
1
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2answers
3k views

How to calculate RPM using frequency

I am working with VFD (CT-2002ES-A75). It shows output frequancy on it's seven segment display. However It has a parameter(Cd46 on page 27 in the manual) for display the current RPM of the motor. For ...
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0answers
44 views

Question about earth grounds for remote control of VFD via a DAQ system

A single-ended earth grounded PCI data acquisition board's analog inputs and outputs are controlled by a PC. The daq board has also analog outputs. One of the analog output is controlling the motor ...
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4answers
263 views

VFD IGBT blew up and I can't find a replacement part

So here’s my situation, a few weeks ago I received a 2.2kW variable frequency drive from a chinese seller and it worked perfectly. I then watched a video on youtube by AvE where he takes one apart (...
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1answer
333 views

How to connect to the inverter with motor [closed]

I have a motor and a inverter (CT-2002ES-A75). Motor nameplate is: How should I connect the motor to inverter? What are the special parameter in the inverter that should I change according to the ...
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3answers
673 views

why three phase induction motor draws current with spike at low frequency by using VFD?

I have built Variable frequency drive (VFD) for a three-phase induction motor using V/F constant control. while I was testing 15HP three-phase induction motor without load with my VFD, the motor draws ...
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0answers
192 views

Filtering variable-frequency-drive noise by an RFI filter

We are having random noise issues on PC controlled data acquisition where one is related to VFD drive which is controlling the AC motor. The thing is that, sometimes we observe continous large noise ...
2
votes
1answer
264 views

Is it possible to connect a phase control relay to an inverter (VFD)?

Is it possible to check a motor ON/OFF state by connecting a phase control relay to the inverter and the motor 3 phase terminals? I have tested a phase monitoring relay to a main 3 phase supply from ...
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3answers
496 views

A simple way to detect an AC 3 phase induction motor ON/OFF state

Background: There is a 3 phase motor running by an inverter. motor specification is about 1.8KW power and 230/400V and 1.13A. I want to drive another DC motor synchronized with that AC motor so the ...
1
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1answer
159 views

Induction motor scalar control

I have been developing a software for scalar control of three phase induction motor with squirrel cage rotor. This control method is based on voltage-frequency characteristics of the motor. The used ...
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1answer
64 views

When supply fan VFD starts up it causes communication problems for my energy management controller

We have an energy management system that controls the air handlers for a building. I have one unit that when the supply fan VFD starts up it cause the unit controller to start having communication ...
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4answers
413 views

Running a 15HP Motor with a 30 kW VFD

We are going be buying a 15 HP motor, and using a VFD we have, currently not doing anything. While I'm told that typically, you buy a VFD for the Motor (i.e. 15 HP Motor + 15 HP VFD), we couldn't let ...
1
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3answers
2k views

How to determine full-load RPM of an induction motor at any arbitrary frequency?

Lets say an induction motor's spec sheet states the following: 1/ 50 Hz, 2-pole, full-load rotations-per-minute (RPM) = 2850. 2/ 60 Hz, 2-pole, full-load RPM = 3450. Can we extrapolate this ...
0
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1answer
159 views

What is the best and cheapest load to test a variable frequency drive at full load?

what is the best and cheapest load to test a variable frequency drive (1 HP VFD) at full load? Maybe a centrifugal pump ? Thanks in advance
3
votes
4answers
109 views

Can I use a VFD to send power of a specific frequency to a frequency meter?

I have a beautiful old frequency meter from a power station, a "System Frahm" type panel based on vibrating reeds. It has two rows with 21 reeds in each, each going from appx. 45 Hz to 55 Hz. It says ...
1
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2answers
591 views

VFD: Regenerative overvoltage trip during deceleration or stop

I have a Mitsubishi VFD Model: FR-F720. It shows the error E0u3, which means according to the manual: "If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed ...
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1answer
101 views

At which set point (frequency) will a VFD dissipate the most heat? [closed]

On a typical application for a variable speed centrifugal pump, at which percentage speed setting will the VFD dissipate the most heat, in other words have the highest losses?
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1answer
107 views

Converting Single Phase Mains into 3 Phases (No VFD) [closed]

I have a goal to build a circuit from scratch to simulate a 3 phase motor. I do not have any specific requirements, rather, I want to make sure that I understand what is wrong with my approach and ...
2
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2answers
78 views

How can I tell if a cable is rated for use as motor leads with a variable frequency drive?

I understand that the switching edges generated by a VFD can cause corona breakdown of the insulation on the motor leads. Due to this, it is recommended that some cables be used for VFD motor leads, ...
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2answers
3k views

How to calculate the DC rail voltage for Variable frequency drive (VFD) for single phase induction motor?

I am working on VDF for Sigle phase induction motor. I just want to compute the total voltage of single-phase induction motor that will need to create from DC link. I am not sure about the calculation....
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3answers
3k views

Connecting a 1.5 KW VFD to a 2.2 KW motor

Today I saw a setup in a factory in which a 2.2 KW 3 phase induction motor is connected to a 1.5 KW VFD. The motor plate: the VFD plate: The motor is connected to a gearbox (the transmission ratio ...
2
votes
2answers
412 views

Can I drive a three phase induction motor with this method?

I have an idea to drive induction motors in a new way. I call it Variable Torque Drive (VTD). You are all familiar with VFD which utilize variable frequency and try to keep the torque constant. This ...
0
votes
1answer
350 views

Rewiring AC motor with 8 wires to vfd [closed]

I am helping a friend who has an AC motor that was originally wired to run on 220VAC but from the looks it is wired to use two capacitors to (somehow) convert a single phase to a 3 phase... the goal ...
0
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2answers
3k views

In VFDs, could motor current parameter be set higher than the actual motor's current? [closed]

What could happen if 0.5 hp motor is connected to 7 hp VFD with the motor current parameter set to the maximum value of the VFD? let us say 14 Amp. How could that affect the motor? The current ...
0
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1answer
558 views

Operating a 60 hz Induction motor at 50 hz

If i had an Induction motor that runs on 460 volts ,35 amps , develops a power of 35 hp at a speed of ~1800 RPM ( data acquired from a nameplate ) How is it possible to calculate the same parameters ...
2
votes
1answer
35k views

Why choose delta over star connection for a 3 phase motor with a VFD?

With respect to a particular application, why is it better to use a delta connection over a star? I have a motor/pump hooked up to a vfd in delta. For my application, Im required to adjust the flow ...
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1answer
275 views

Testing an induction motor with a VFD, difference in voltage and mechanical power vs electric power

I have question about a electro motor powered by a frequency regulator. It is the first time I did some test on a frequency regulator on school. This are the parameters of the motor The motor is ...
1
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1answer
997 views

How to determine a Permanent Magnet Synchronous Motor (PMSM) Nameplate?

I have already built a three-phase Permanent Magnet Synchronous Motor(PMSM) and wanted to use a VFD in sensorless vector control mode to run it. Now I want to figure out the characteristics of my ...
0
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2answers
564 views

VFD or gearbox for Linear Actuator?

I'm designing a linear actuator for a particular application, and the electric motor I'll be using will be a 1/8 HP three-phase motor. I need to decrease rotation of the motor, and my first idea was ...
0
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1answer
293 views

Will VFD provide enough startup current for induction motor under full load?

I have a a 3-phase AC induction motor with the following ratings: rated power: 0.75kW rated current: 1.65A rated voltage: 3x400V rated torque: 5Nm supply freq: 50Hz start/rated current: 7.0 Will a ...
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1answer
103 views

how do I change a Ultra High voltage AC currents frequency?

I am currently making a theoretical tabletop particle accelerator. and i need the materials in the accelorator to be resonating together at a set frequency (Whcih I can change to test speicific ...
18
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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
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1answer
137 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
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2answers
92 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
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2answers
121 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
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2answers
1k views

Induction Motor Power Factor with Variable Speed Drive

I know something about pumps, but less about the motors which drive them and am looking for some help in this regard. The motor in question is a three phase two pole squirrel cage induction motor. I ...
0
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1answer
306 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 ...
0
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2answers
172 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
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2answers
48 views

VFD output connection related query

What will happen in an VFD if any two terminal of the output power given to motor (R,Y,B) are interchanged
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2answers
517 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 ...
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 ...
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3answers
277 views

What would be the options to supply a 3-phase motor without using the power lines?

If we have a 3-phase 600A, 400V AC induction motor with a VFD. Are there any techniques to supply it with a huge acu/battery or a generator. This is to use when electricity is gone or no power network ...
2
votes
6answers
469 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
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1answer
190 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
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2answers
771 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 ...