Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [vfd]

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

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 ...
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 ...
3
votes
4answers
718 views

what are the implications of using a 45kW ACS580 ABB VSD on a 22kw induction motor?

What are the implications of using a 45kW ACS580 ABB VSD on a 22kW induction motor?
3
votes
3answers
341 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-...
3
votes
4answers
108 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 ...
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 ...
3
votes
2answers
65 views

Miscalculating the nominal power using nominal current and voltage of a VFD

A variable frequency drive datasheet has current parameters named as I2N and I2hd. If Im not mistaken these currents are the per line currents for the drive output as follows where I showed in red ...
3
votes
4answers
826 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 ...
3
votes
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, ...
2
votes
2answers
405 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 ...
2
votes
2answers
119 views

Powering a 3 Phase 230VAC Motor with 28 12V Batteries wired in Series

Mechanical Engineering student here. I'm a part of a senior project team that trying to run a 40 HP 230 VAC three phase motor with a 40 HP VFD for a hydraulic pump. Our plan is to wire 28 Lead Acid ...
2
votes
1answer
256 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 ...
2
votes
1answer
34k 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 ...
2
votes
1answer
846 views

Running a 3ph motor rated for 380v star on 220v delta

I've got an old Soviet 4kW motor, made in 1983. The dilemma is that the nameplate info states a Y-connection/380v/8.7amps and I want to run it on delta using my VFD which produces 3ph 220v. All my ...
2
votes
1answer
46 views

Motor / VFD / Protective Earth

I have little experience with AC motors since I'm majoring in Mech.E. My team is setting up an AC motor with a VFD to control the movement of an airfoil inside a metal cage we built. I understand the ...
2
votes
2answers
65 views

AC motor must be run off inverted DC?

I am looking at the datasheet for a motor. This is an AC induction motor designed for use in electric vehicles. It includes the statement [my emphasis]: The motors are designed for installation in ...
2
votes
6answers
467 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 ...
2
votes
1answer
267 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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
2answers
28k views

How to wire 3 phase motor to VFD

I am trying to wire a new motor to a variable frequency drive (VFD) and having some trouble figuring out how to wire the motor to the VFD. The motor is a 1 HP, 3-phase, 208-230/460 volts, and I'm ...
1
vote
1answer
42 views

Does a 3-phase VFD work if one phase is reduced (e.g. with a dimmer)?

If you have a 3-phase VFD running a 3-phase motor, and you use a leading or trailing edge dimmer on one or two of the input phases, will the VFD continue to operate normally, pulling more current from ...
1
vote
3answers
194 views

Using PWM instead of real DC for VFD's 0-10V control input

There is a VFD which controls an AC motor through a 0-10V control. I know that this control voltage is DC voltage. I'm wondering would a PWM work for this application? I mean instead of 2VDC, what ...
1
vote
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 ...
1
vote
3answers
3k 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 ...
1
vote
3answers
88 views

A very basic question about VFD output frequency

I know that a VFD's inverter stage creates alternating voltages at a desired frequency for the terminals of a delta induction motor(stator voltage freq.). Normally without a VFD the nominal freq. ...
1
vote
2answers
84 views

Not using all 3 phases of sine filter

I want to run a single phase motor with a single phase VFD. I don't believe that the motor is rated to run with a VFD. To compensate for the issue I would like to use a sine wave filter. ...
1
vote
1answer
983 views

How does carrier frequency and pulse width modulation in a VFD work together to control AC motor speed?

There is a lot of online information about this but there is also a lot of contradictory information. What is carrier frequency exactly and does it stay the same or does it vary? I understand the ...
1
vote
2answers
562 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 ...
1
vote
2answers
91 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 ...
1
vote
2answers
759 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 ...
1
vote
3answers
2k views

Effect of 0 Hz setting on VFD with continuously spinning fan

As part of a HVAC system we have a supply fan and extract fan running on independent VFD1. With the current configuration we usually don't need to run the return fan as the supply fan pressurises the ...
1
vote
1answer
47 views

Voltage source & current input

I am working on a project where I have a current source (analog output from a PLC) controlling a VFD. Based on the position of the dipswitch, the VFD will accept either a current or voltage input. The ...
1
vote
1answer
37 views

DC bus correction for inverter VFD via PWM modulation

This is a question concerning an inverter circuit without PFC. Single phase AC is rectified and pooled on DC bus capacitors. From there the DC voltage is modulated at 5kHz on 6 IGBTs, emulating ...
1
vote
1answer
65 views

Why use many-pole motor for high speed?

I found in this teardown analysis of the Nissan Leaf drive motor that it runs up to about 10,000 RPM but is an 8-pole motor. My understanding is that the inverter cost goes up with frequency. The Leaf ...
1
vote
1answer
71 views

Inductor Machines: why is constant flux achieved before reaching nominal speed?

It is observed that an induction machine increases its voltage linearly before reaching its nominal speed. This is achieved due to the emf generated by the rotor movement. However, I find it ...
1
vote
2answers
206 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
vote
1answer
153 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 ...
1
vote
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 ...
1
vote
1answer
189 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
1answer
425 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 ...
1
vote
1answer
96 views

Problem in temperature transmitter because of VFD (Variable Frequency Drive)

I made an amplifier of PT100 bridge which operates on 24V DC supply and gives 0 - 10V DC for 0 - 400°C when tuned. The circuit is as follows : Here P2 + and P4 S+ are shorted and P4 S- is left open....
1
vote
2answers
144 views

Run 1800 RPM motor at 3600 RPM

I have a 2”x72” belt grinder with a Brook Crompton bf4n.75-2 motor. It is connected to a Teco L510 VFD. Running here in the United States on 110v. My question is about turning up the RPMs sometimes ...
1
vote
3answers
274 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 ...
1
vote
1answer
22 views

Slip Control vs Constant V/F Control for 3-Phase ACIM

I am trying to understand how is Slip Control different from Constant V/F control. If I need to control the speed of 3-phase ACIM then its slip would obviously change with its rotational speed then ...
1
vote
2answers
55 views

How much is the permeability of this attached inductor core?

I want to use this inductor for AC line filter as line reactor. Its inductance value is 6 mH but I don't know the exact value of permeability of the material. It will be used with VFD at the input to ...
1
vote
1answer
977 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
votes
2answers
759 views

Why this pair of IGBT's died silently?

Before some days I have taken a look at circuit which controls AC current's frequency. That circuit was a VFD which looks like: simulate this circuit – Schematic created using CircuitLab But ...
0
votes
3answers
97 views

Can a Variable Frequency Drive convert standard wall outlet (120V/15A/single phase) to ~220V 3 phase?

In my workshop I have a device that requires 220V 3 phase power, with a requirement of up to 1.5kVA. In North America, my wall outlet provides ~120V/15A single phases. (EDIT - my device can take +/- ...
0
votes
1answer
148 views

Are there safe ways to run an induction motor rated for 50/60 Hz at a lower frequency?

I have an induction motor that is rated for 50/60 Hz, with full-load amperages of 1.85A / 2A respectively. It is not rated for any other operating frequency. If I connect it to a VFD, will it be safe ...