Questions tagged [stator]

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What is a good circuit model for an AC generator?

A very simple electrical AC generator can be made by spinning magnets around a fixed stator coil. The changing magnetic field induces current in the stator winding. It would seem that at a fixed ...
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0answers
58 views

Electricity generation with diamagnetism

Will a strong diamagnetic material like bismuth allow for electricity generation if the copper coils are on the other side of the bismuth plate from the magnet? Imagine the following three layer ...
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0answers
37 views

BLDC motor won't start after reversing the stator axial direction

I'm adapting a 60V BLDC e-scooter hub motor (see image below) to a custom made EV. In this specific motor, as it's designed for scooters, the wiring and the brake disc mounting are in opposite sides, ...
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0answers
19 views

What is the net magnetic flux density in the center of a four-pole stator and other multiple-pole stator?

According to this ppt, if the currents are given as $$\left\{ \begin{aligned} i_{aa'}=I_M\sin{(\omega t)} \\ i_{bb'}=I_M\sin{(\omega t-120°)} \\ i_{cc'}=I_M\sin{(\omega t-240°)} \\ \end{aligned} \...
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1answer
89 views

How do I quantify the effect of stack lamination on a stator and on a rotor of an induction motor?

Image from here: I would like to design (or to calculate the existing of) an induction motor, either 3 phases or single phase. I understand that both stator and the rotor made from a stacked-laminated ...
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1answer
24 views

How much high is the amplitude of stator-MMF of 3-phase 2-spp integral slot winding type machine as compared to 3-phase1-spp machine of same type?

Details: No. of POLES=2; i.e 1-pole pair SPP= slots per pole per phase In my case, amplitude of MMF of 3-phase 1-spp machine= 0.75; Then what should be the amplitude of MMF for 2-spp machine ? Is it ...
1
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1answer
209 views

Induction motor starting torque and pull out torque

Recently I was doing some work on the induction motor where I found some general theory on starting speed torque curve of the induction motor. Where the theory is the starting torque will be 1.5x of ...
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3answers
265 views

What is limiting my BLDC Motor power Output?

I am using a BLDC 3 phase hub motor and recently installed a motor controller rated for 3000watt (I originally had a 1200Watt controller installed). The motor is rated for 500w nominal 800w peak but ...
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2answers
411 views

(edit) Brushless Motor - Why does the stator burn up if the rotor doesn't rotate?

If I was to apply power to a 3 phase stator, which in turn creates a magnetic field that's projected onto the rotor (with magnets), and (in a friction-less world) would cause the rotor to rotate (...
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1answer
106 views

Is a stator another word for a soft iron core? [closed]

Pretty much a yes or no question. Would be greatly appreciated thankyou
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2answers
83 views

AC motor design

Is it possible to have an AC motor with only a partial stator, one that does not fully encompass the rotor? Refer to the picture to understand what I mean. This would be needed to drive a spherical ...
2
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1answer
455 views

Working of a Doubly-Fed Induction generator (DFIG) in wind turbines

I am unable to understand how a Doubly-Fed Induction generator works (in Wind Energy conversion system)? I do not understand how the reactive power fed into the stator interacts with the rotor so as ...
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1answer
127 views

Why the rotor core losses are very tiny compared to the stator core losses in an induction motor?

Book says rotor mostly runs at speed near to synchronous due to which the relative velocity between rotor and stator magnetic field is very less. Correspondingly making rotor core losses tiny and ...
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1answer
838 views

Can I coil directly onto the iron cores of a stator for a basic generator?

I am constructing a very basic miniature generator (25mm diameter), the rotor has 8 bar magnets, and there will be the same number of coils, wired appropriately, in the stator. . I understand that ...
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1answer
551 views

Is my rotor/stator configuration correct?

Question 1) I am trying to make a miniature alternating current (ac) generator from elementary first principles. Before I waste a lot of time (and copper wire), I wanted to check if the ...
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1answer
110 views

Does a BLDC stator benefit of being i one piece? [closed]

Does a stator benefit of being in one piece, as different phases may form a horse-shoe(?), or is the layout puerly of manufacturing efficency?
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1answer
5k views

Why would a rotor get stuck on the side of the stator when the induction motor is turned on, and how to fix it? [closed]

My big fan stopped working, so I decided to dismantle it and check what's wrong with it. The problem lies in a faulty induction motor. I opened it and found out that I can easily turn the rotor ...
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2answers
2k views

Designing/Predicting Output from Permanent Magnet Motorcycle Stators

I'm hoping you can help me. I've long been into motorcycles, and have restored and customized many different bikes. While building custom motorcycles, I often add electrical accessories, and use high ...
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1answer
881 views

Is there a mandatory pattern for stator windings in 3 phase induction motors?

Imagine simple 2 pole 3 phase induction motor, is there a mandatory pattern for the stator windings to creat a rotating magnetic field? Why must the angle between the coils be 120 mechanical degrees ...
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2answers
3k views

Does a longer stator equal more torque in a BLDC setup?

I'm interested in making something like this: http://www.vivax-assist.com/en/produkte/vivax-assist-4-0/vivax-assist_4-0.php Because it looks awesome, but for the price i could buy a motorcycle and ...
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1answer
5k views

why the stator frame of a 3-phase generator is made up of cast iron?

I don't have a good knowledge of engineering materials, so please answer the following questions with reasons. Why is the stator frame of a 3-phase generator made up of cast iron? Why is the ...
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2answers
2k views

Stator Current & RPM - Motorcycles

Short and simple - I want to understand the relationship between RPM (specifically on a motorcycle crankshaft) and AC stator current. In most motorcycles there is a magnetic field generated at the ...
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3answers
3k views

Meaning of “with respect to rotor and stator”

In the following example, when it says “with respect to stator” and “with respect to rotor”, did they mean the rotor part of the synchronous generator in both cases? Example: The excitation field in ...
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2answers
235 views

Circuit of a Rotor on an Induction Motor

Here is an equivalent circuit of a rotor on an Induction motor: Can someone explain How do we arrive at this circuit? The rotor seems to be only a disc(made of a metal) with conductors embedded near ...