1. ### Approximate energy loss ratio in mechanical springs

Hi!.. As known, a certain amount of energy is applied for compressing a mechanical spring. Thus mechanical spring is charged with energy and it stores it as elastic-potential energy. But whole energy, applied for compressing spring, can not be converted into potential energy. The reason is...
2. ### Perovskite solar cell J-V scan

Hi all, I am working on perovskite solar cell related studies. J-V curve (current density-voltage curve) is one of the important measurements to determine the performance of the device. In practice, we perform the reverse scan first then then followed by the forward scan. There is usually a...
3. ### How to define a hysteresis loop in ANSYS MAXWELL?

I am trying to simulate an electric motor in ansys maxwell software, but I can't define the whole loop in four quadrants for the material used in the rotor however it is essential to do this since the motor is of hysteresis type and works on the principle of working point moving all around the...
4. ### How to design a motor with a given set of requirements?

Let's suppose we are given a set of requirements and we are to design a motor that meets them. Requirements are: 3 phase synchronous, 480v, 50Hz and of hysteresis type and alnico is the only available option and it should deliver a 0.6N.m output torque. Dimensions should not exceed 150 mm and...
5. ### Motor simulation in Maxwell

Hello, I'm trying to simulate a 3 phase hysteresis motor with 4 poles, 36 slots, 220 input voltage peak for each phase, 50Hz, specified dimensions and 0.6 N.m output torque in maxwell transient. The magnetic material used is LNG52 which is also known as alnico600, alnico5DG(ACA52) and alcomax...
6. ### Hysteresis of a voltage comparator

Hello, I am designing a circuit which basically takes two voltages (V1,V2) and based upon which one of the two is greater, turns corresponding LED. So, I have got to the part where I have output from differential op amp that is the input of the inverting voltage comparator with hysteresis...
7. ### Remnant Magnetisation varying with input amplitude

In a lab we had to measure the remnant magnetisation of a hysteresis loop with a permalloy core. The amplitude of the input sinusoidal wave was varied and the resulting remnant magnetisation measured. This was then plotted resulting in the remnant magnetisation varying sinusoidal with the input...
8. ### Hysteresis Friction

Hi Guy's, I'm starting a project to explore the physics of hysteresis friction between two surfaces. One flat metal surface is considered to have zero compressibility but does have grooves interrupting the sliding action. The second material (organic elastomeric compound) also having a flat...
9. ### I Measuring advancing contact angle

Hi everyone ! I'm currently working on a project for which I need to measure the advancing contact angle of a liquid on a solid, specifically the advancing contact angle of a molten thermoplastic on carbon fibers. My understanding is that there is a difference between dynamic contact angles...
10. ### Post-buckling behaviour of steel bracing in ANSYS workbench

Hi, I am trying to use ANSYS workbench to model a steel frame with steel cross bracing (HSS 32*32*3). The post-buckling behaviour should be similar to the Remennikov-Walpole analytical model (1997) where in a rigidly fixed ended brace three plastic hinges will form in buckling. The expected...
11. ### Hysteresis Coefficent Units

I'm working with hysteresis losses in transformers at the moment, and I was wanting to know if there are units for the coefficient. Normally, I'd just rearrange the equation for units, below, h=ηB1.6f η=hf-1B-1.6 so it would have units JsT-1.6 However, given the power of 1.6, I'm not sure it...
12. ### Frequency appears to have to effect on hysteresis

This question is primarily regarding transformers, particularly the impact frequency has on hysteresis loss. Given hysteresis loss = η×Bmax×f×V and Bmax = (V ×〖10〗^ 8)/(√2 π×f×N×A) This means that hysteresis loss = η (V ×〖10〗^8)/(√2 π×f×N×A) fV = (η ×〖10〗^8)/(√2 π×N×A) V^2 And as such...
13. ### I Lab experiment: hysteresis disappears, reappears and then disappears again. How?

Hi people, In my college laboratory we were assigned an experiment to measure the hysteresis curves of a certain ferromagnetic material at different temperatures. Sounds simple, right? Well, the block of Monel 400 we chose did something weird. We cooled it down to about -200°C and set about to...
14. ### Single Phase Transformer Losses -- Hysteresis, Eddy Current Constants

Hi. My colleagues and I are doing a research on transformers (single-phase) and we stumbled across the following equations involving hysteresis and eddy current losses: Wh = ηBmaxxfV where Wh = hysteresis losses η = Steinmetz hysteresis constant Bmax = maximum flux density x = constant...
15. ### Magnetic hysteresis loop area meaning

Let's consider the Magnetic hysteresis loop of a certain material: this is an example. In many sites and books it is written that its area is proportional to the energy wasted as heat, so A = kE_d. In particular, that area "is related to the amount of energy dissipation upon reversal of the...
16. ### Problem with core saturation

Over the years I've learnt a lot about TXs etc. But I'm a bit rusty. Any thoughts on general reminders about core saturation. I know there are huge issues, but the specifics I can't remember that well. I vaguely remember hearing something like when there is a DC component on a transformer the...
17. ### Hysteresis in helical coils springs

Hi, Do helical springs have hysteresis. Say I do an exercise of plotting deformation Vs load curve of a helical spring, one way will be starting from load zero and increasing till the spring achieves solid length. The other way will be loading the spring till solid length and measuring...
18. ### Clutch stiffness and hysteresis - Role in gearbox NVH

Hi, There is a rattling noise in one of the automobile passenger car gearboxes that we designed. After few experiments and observations, it was found that the noise is because of incorrect clutch stiffness and hysteresis behavior. I have got some fundamental questions about both: 1. Clutch...
19. ### Lightbulb I/V curve question

The question I've been given this question by a teacher and I'm clueless as to what b) and c) are. Could you please help? I would really appreciate it. The prize is a place to see a lecture on quantum simulation at our local University. Thank you :)