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-4
votes
2answers
30 views

Tolerance on rpm of motor [on hold]

What is the tolerance limit on rpm of single phase induction motors? i have an motor with specs 1100 rpm. we runit at 230 voltage but the rpm is observed 1045. need to confirm whether is is usable?
2
votes
1answer
68 views

Which is the physical insight behind the widely approved 'space vector' notation used in the analysis of the dynamic model of electric machines?

When approaching the study of electric machines in transient condition, it is customary to discard the real physical vector quantities like magnetic field and magnetic induction and to define fake ...
0
votes
2answers
49 views

How does the number of poles in an induction motor determine its speed and torque?

I notice that the higher the number of poles, the slower the induction motor spins. Likewise, the lower the number of poles, the faster it spins. How does the number of poles affect its speed? Also, ...
0
votes
0answers
50 views

How to wire capacitor start ac motor

I have a motor with a blue, yellow, black, and orangish wire coming out of it and I'm trying to figure out how that should be connected to power based on the wiring diagram on the side of this motor. ...
0
votes
1answer
39 views

How to wire this Buffton motor

I bought this motor at a scrap yard and would like to wire it up for 120 volt power. There are 5 wires coming from the motor, a black, white, ground and two yellows. One yellow is numberer "2" and ...
0
votes
1answer
47 views

What is a torque motor exactly?

Wikipedia states Torque motors are normally induction motors of toroidal construction. Their main differences from other similar motors are their wide diameters, to allow for high levels of ...
1
vote
2answers
57 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
36 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 ...
0
votes
0answers
12 views

Clarification about dq transform

I was going through a built in model in simulink (DFIG wind generator) and came across the following equation for the dq transform: V1=1/3(Vab-a^2*Vbc) I have also attached a picture of the simulink ...
0
votes
0answers
12 views

The relation between system frequency and DIFG wind turbine rotor speed

I have a question regarding to the relation between DFIG wind turbine rotor speed and system (power grid) frequency. For example, it is said when the system frequency drops, the rotor speed also ...
0
votes
0answers
26 views

Induction motor parameters in SIMULINK

I want to model some of my home appliances using SIMULINK software. I already measured the power consumption of the exhaust fan. I found it to be consuming around 65 w at 230 v. I found the single ...
0
votes
1answer
40 views

Electric motors with both stater and rotor as electromagnets [closed]

I am totally new to the Electrical area. I wanted to do a project on Electric car which needs an Electric motor which is highly powerful and efficient. Are there any motors which have both stater and ...
1
vote
1answer
77 views

How do you choose between 450 V vs. 750 V as a power source for your EV? [closed]

I am wondering what the decision factors are to help choose between 450 V DC and 750 V DC power source for an EV (electric vehicle). The propulsion system is available in voltages between 350v and ...
0
votes
0answers
31 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 ...
0
votes
1answer
22 views

dsPICDEM MCHV-2 Development Board motor connection

I have dsPICDEM MCHV-2 Development Board and three phase induction motor. I don't know how to connect the motor to the development board. I have connected three lead wires of the motor to the three ...
-2
votes
1answer
36 views

Direct Torque Control of Induction Motor (DTC)

I was working on a project on how to design a classical Direct Torque Control drive DTC but there is a ceratin point that i can't understand. How can we calculate the Reference values of the torque ...
0
votes
2answers
29 views

Wound Rotor Induction Motor Generator Conversion

I have a 3 phase wound rotor induction motor which I would like to convert into a generator. I was wondering if it is possible to excite the rotor windings using a DC current. I attempted to do this, ...
0
votes
1answer
44 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
73 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. eBay Motor^ I have been very confused. They both are approximately the same size ...
0
votes
1answer
46 views

Measuring R1 in induction motor equivalent circuit and parameter extraction from test

I always had this question that I never really found written anywhere and I have the good or bad habit of not believing my teachers when answering this kind of odd questions. Whenever I read about ...
1
vote
1answer
91 views

How can the Model S have a three-phase motor? I thought it was DC?

Supposedly the Tesla Model S has a three-phase AC induction motor. I thought it ran on batteries. Aren't batteries DC?
0
votes
1answer
42 views

Which formulas do I need to calculate current of a 3phase induction motor

How can I know the current a motor would require to run at a given RPM. Here are some values: 160 HP motor 325 volts 2300 RPM 311 ft/lbs of torque(not sure how useful this is) induction motor using ...
0
votes
1answer
38 views

AC induction motor circuit and stall current

How can I describe the stator current of a 3-phase locked/stalled induction motor by using equivalent circuit of the motor?
0
votes
1answer
47 views

How does a moving magnetic field cause motion in the Al strip rotor?

Consider the following information: https://www.youtube.com/watch?v=7snjbmdYlDI How would you explain how the moving magnetic field causes motion in AL labeled rotor?
1
vote
1answer
608 views

I bought an air conditioner in Thailand rated 220v-240v, 50 Hz. What could happen if I use it in our country which uses 220v, 60 Hz? [closed]

I bought an air conditioner (split type) rated 220v-240v, 50 Hz. What could happen if I use it in our country which uses 220v, 60 Hz? A lead technician from a refrigerator and air conditioner shop ...
0
votes
1answer
43 views

AC single phase induction motor - phase difference problem

I want to build and AC single phase induction motor. There's the following schematic for its construction. This motor can only work if there's a 90º phase difference between \$I_1\$ and \$I_2\$ as ...
3
votes
4answers
129 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
285 views

varying run capacitor for speed control of single phase motor

If I want to vary speed of single phase electric motor within say, 10 to 20%max of its rated speed ( or torque ), is it a good idea to change its run capacitor setting ? ( either via multiple ...
0
votes
1answer
91 views

Efficient Single Phase Motor Speed Control

Usually triac based speed control vary the phase angle of firing to reduce the amount of power goes in to motor, and hence control its speed. this is not very efficient method, also it may not be good ...
1
vote
3answers
962 views

Calculating the capacitor values to control ceiling fan speed

I have an old ceiling fan motor that runs with a 1.5µF run capacitor, at what I believe is, its full intended speed. With the help of some folks here at StackExchange I've wired everything up as in ...
0
votes
4answers
84 views

Three phase Motor rotation

Is it possible that a three phase motor still spin in the same direction it was even after the phases are interchanged.
0
votes
2answers
260 views

Speed control on a ceiling fan induction motor

I've managed, through the help of others here on Electronics StackExchange to get a ceiling fan motor running, at least at one speed, and in the right direction. I want to enable 3 speed settings ...
0
votes
1answer
54 views

How to wire an AC induction motor

How do I get the ceiling fan motor below wired, and how do I enable speed control? Our AC outlet supplies 220V, and the motor comes with a 1.5uF capacitor. I understand I would need an h-bridge ...
3
votes
1answer
66 views

add run capacitor to capacitor start motor to increase efficiency

Can I add a run capacitor to a capacitor start motor to increase its efficiency? I remember doing this 20 years ago and the run current dropped 20% or so, but I didn't measure the power consumed. The ...
3
votes
1answer
37 views

Is there any way to use the saturation harmonics to determine the rated voltage of a induction motor?

When the motor is running at no-load, the core eventually saturates as the AC supply voltage is increased. Therefore, harmonics will be present in the AC supply current waveform . I suspect that the ...
0
votes
1answer
35 views

Why is the voltage more in case of same polarity during a polarity test of induction motor?

I was performing experiment in the lab of my university. The experiment was supposed to be performed on a squirrel cage induction motor. But I performed it on a three phase slip ring I.M with its ...
0
votes
0answers
41 views

Calculating the value of external resistors on an induction motor

I have been given part of a question to answer; "Calculate the external resistors needed so that the motor develops 100kW @ 500rpm", with the various other values that will apply. I've calculated the ...
0
votes
2answers
71 views

Minimal power circuit for recupating three phase motor drive on DC

A thee phase motor (like an asynchronous motor or an brushless DC motor) can be driven from DC power by using a half bridge on every of the three phases (for example by six FETs) if I'm right. What ...
2
votes
1answer
77 views

Would you help me understand the design of this induction motor?

I need to understand the design of a single phase induction motor (I think it is a permanent split capacitor motor). The motor works on three different speeds. It has 8 poles as shown in figure. ...
0
votes
4answers
290 views

Ways to estimate the rated current of an induction motor without nameplate

I am looking at ways to find the rated current of the motor without the nameplate data. Methods for rated voltage has been found. Assuming that we have the rated voltage, what would be some ways or ...
0
votes
1answer
97 views

Designing a brushless DC motor:

I watched a DIY video recently on building a brushless DC motor. Can someone demonstrate for me how to calculate the max torque & max rpm of that motor based on the components that are used in ...
0
votes
1answer
229 views

Why starting current in star-delta starter becomes 1/√3 times that of DOL starter?

I have seen this statement in a question paper. I was asked to prove it but I can not find the logic.
-1
votes
1answer
647 views

Starting torque of an induction motor

The starting torque of an induction motor increases with increasing rotor resistance. However, we know that, with increasing rotor resistance, rotor current will reduce, and hence rotor flux will ...
0
votes
1answer
112 views

What is the synchronous speed of single phase induction machine from 2 phases of 3 phase machine in parallel?

If I take all three windings of a three phase induction machine and put them in series, it acts as a single phase induction machine with three times the number of poles. This scheme is used to perform ...
2
votes
2answers
83 views

Interface for Induction Motor

I'm trying to make a board for controlling a reversible single phase induction motor. The board simply needs to be able to turn on/off the motor and control the direction. My understanding is that ...
0
votes
1answer
48 views

Sensorless Drive

for my general electrical course I participated lab work about sensorless induction motor but for one part it requires to plot graph, I did not understand how to create this graph.Can you help me ...
0
votes
3answers
139 views

What motor type is better suited for instant torque supply

I am working in a robotics project and I am looking way to make my robot "dash" as soon as possible. Therefore I need to have a quite high acceleration for a brief time. To be more specific, I am ...
1
vote
1answer
420 views

Tips to find the rated voltage of the induction motor without nameplate data

I am doing a project in which I need to find the parameters without nameplate data of the induction motor. I am looking into finding a way/method to find the rated voltage of motor. Can I get any tips?...
1
vote
0answers
21 views

Microchip MCHV reference design Ic Ia IBus current waveforms

I have built a Microchip MCHV board (ACIM Inverter based driver) from the schematics on the MCHV user manual. http://ww1.microchip.com/downloads/en/DeviceDoc/dsPICDEM%20MCHV%20development%20board%...
1
vote
4answers
275 views

What type of motor should be used to handle a static torque (blocked shaft)?

For the purpose of DIY robotics, I would like to have an electric motor, which is best for providing torque while not rotating. I imagine my robot will maintain a static balanced torque while ...