I think when you short a transformer, what you see looking into the primary is the primary winding resistance plus the secondary winding resistance reflected back into the primary in series with the leakage inductance of the transformer. I suspect this holds for motors as well.
Doug Smith Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: [email protected] Website: http://dsmith.org ________________________________ From: Ralph McDiarmid <[email protected]> Sent: Thursday, August 15, 2024 7:48:34 AM To: [email protected] <[email protected]> Subject: Re: [PSES] Motor Locked Rotor and Overload Testing That’s the only non-linear effect I can envision, however, all the models I’ve seen using a Google search suggest an RL network only. I don’t think the stator laminations would saturate during locked rotor for the same reason a transformer core doesn’t saturation when its secondary winding is shorted. Ralph From: James Pawson (U3C) <[email protected]> Sent: Thursday, August 15, 2024 4:53 AM To: [email protected] Subject: Re: [PSES] Motor Locked Rotor and Overload Testing Hi John, Thanks for the reply. Non linear response because of saturation of the magnetic material? All the best James James Pawson Managing Director & EMC Problem Solver Unit 3 Compliance Ltd EMC : Environmental & Vibration : Electrical Safety : CE & UKCA : Consultancy www.unit3compliance.co.uk<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.unit3compliance.co.uk_&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=c9NR2mGfldry-2pM9Bbuww&m=GqvAT31xXIVtvlxPsq1UlKlNtA8n7LOnmW8O-n2C-DfLdQWbgkT34x3D8kzfoA1w&s=NiJf6pX0ilU6resJtYq55vrPaC8c6VrSZLqfXxRUyyQ&e=> | [email protected]<mailto:[email protected]> +44(0)1274 911747 | +44(0)7811 139957 2 Wellington Business Park, New Lane, Bradford, BD4 8AL Registered in England and Wales # 10574298 Office hours: Every morning my full attention is on consultancy, testing, and troubleshooting activities for our customers’ projects. I’m available/contactable between 1300h to 1730h Mon/Tue/Thurs/Fri. For inquiries, bookings, and testing updates please send us an email on [email protected]<mailto:[email protected]> or call 01274 911747. Our lead times for testing and consultancy are typically 4-5 weeks. From: John Woodgate <[email protected]<mailto:[email protected]>> Sent: Wednesday, August 14, 2024 5:46 PM To: [email protected]<mailto:[email protected]> Subject: Re: [PSES] Motor Locked Rotor and Overload Testing The stalled motor is a non-linear load, so an RL circuit might not be representative. For overload testing, we used a band-brake, but I suppose a disc brake would be used now. You would need to plot the torque versus hydraulic pressure curve to calibrate it. On 2024-08-14 17:36, James Pawson (U3C) wrote: Hi all, We’ve had a few things in the lab recently requiring motor locked rotor and motor overload testing. Working on the principle that a locked rotor motor looks like a short circuit (inductance and DC resistance of winding) would it be reasonable to just substitute the motor with the equivalent circuit? For an overload testing (steadily increasing the load on the motor drive until failure or trip) I’m not sure how best to practically do this. How do people achieve these tests practically in the lab? What equipment is used? Any recommendations gratefully received. All the best James James Pawson Managing Director & EMC Problem Solver Unit 3 Compliance Ltd EMC : Environmental & Vibration : Electrical Safety : CE & UKCA : Consultancy www.unit3compliance.co.uk<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.unit3compliance.co.uk_&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=c9NR2mGfldry-2pM9Bbuww&m=GqvAT31xXIVtvlxPsq1UlKlNtA8n7LOnmW8O-n2C-DfLdQWbgkT34x3D8kzfoA1w&s=NiJf6pX0ilU6resJtYq55vrPaC8c6VrSZLqfXxRUyyQ&e=> | [email protected]<mailto:[email protected]> +44(0)1274 911747 | +44(0)7811 139957 2 Wellington Business Park, New Lane, Bradford, BD4 8AL Registered in England and Wales # 10574298 Office hours: Every morning my full attention is on consultancy, testing, and troubleshooting activities for our customers’ projects. I’m available/contactable between 1300h to 1730h Mon/Tue/Thurs/Fri. For inquiries, bookings, and testing updates please send us an email on [email protected]<mailto:[email protected]> or call 01274 911747. Our lead times for testing and consultancy are typically 4-5 weeks. 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