The first batch of compressors equipped with 180KW@20krpm high-speed motors is about to be delivered.
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This post was last edited by A Le on 2015-8-26 at 14:59. It’s going to be exciting to see the MVR compressors equipped with high-speed motors of 180KW@20krpm being introduced and tested; I’ll be keeping an eye on it! Next goal: 280KW@30krpm. Whoever has experience with the installation and debugging of high-speed drives (direct drive, without a gearbox), please share the key points to keep in mind! I’ll kneel and express my gratitude first!
I don’t understand; why does the text become garbled when posting for the first time?
Is it a 10KV high-speed motor with 180KW@20krpm?
It is 380VAC, 2P, driven by an inverter； Rated at 20 krpm, with a normal operating speed range of 15,000 rpm to 20,000 rpm. The inverter operates in VF mode when in use, as the vector mode is not suitable for this operating condition. 690VAC or 10KVAC is only considered when the power exceeds 400KW.
What brand is the inverter and motor you have? Can the power reach 3000 KW? 12000rpm。
The motor is custom-made, right? With such high speeds, the bearings and mechanical strength require special design.
This post was last edited by tongfumin on 2015-8-27 at 11:34. Inverter: A fairly standard inverter will suffice, but it is necessary that the inverter be able to output high frequencies; for 2P motors, 20 krpm requires 333 Hz. (If it is 4P@30krpm, an output of 1000HZ is required.) However, at such frequencies (above 550HZ), all frequency converters from EU as well as US and Japanese brands impose restrictions on use in mainland China, requiring users to apply for a license separately. (Domestic brands such as Inovance and INVT are all suitable) ； Imported brands such as Siemens, Danfoss (the acquired Vaukan), Schneider, etc. Motors: The motor components are developed and produced by our own company. This motor has been in stable use in high-speed applications for 6 years (with a maximum speed of 40 krpm); it features water cooling and C-class insulation. If the 12 krpm you mentioned refers to the rated speed (above 12 krpm, torque decreases and constant power output is achieved), our current maximum power is 377 KW.
Yes. Non-contact bearings are used ； The linear speed of the motor rotor can reach 200 m/s in certain power ranges. If it isn’t specially designed, the motor would disassemble long before it reaches its rated capacity. :Lol. Additionally, at high frequencies, the motor must have good and stable high-frequency performance (such as high-frequency hysteresis losses, core eddy current losses, and rotor windage losses), as well as good vibration characteristics of the rotor (including the source of vibrations, seismic resistance, and the values of higher-order critical speeds).
The delivery date has been set, expected in December. The customer needs explosion-proof certification; someone who is familiar with the process for obtaining such certification could please provide some guidance. Thanks!
Could some expert please explain the advantages and disadvantages of using a high-speed motor directly, as well as a low-speed motor combined with a gearbox?
Direct-drive advantages: small size, light weight, potentially higher cost for frequency conversion (if capacity reduction is required), maintenance-free； Indirect high speed: Mature, noisy, and difficult to maintain ； In terms of cost: there is little difference; it depends on the rotation speed – if it exceeds 30,000 revolutions per minute, direct drive is definitely cheaper.