DC to AC motor conversion - Electric motors & generators …
2009年3月29日 · The other two chain transfer drives use AC slip ring motors with associated gearboxes (5.5kw!!!), unfortunately there is very limited room and the gearbox approach was not a viable option. If this DC-AC conversion is successful there may be a plan to change three other DC applications (60HP) fed from our MAR 220Vdc supply.
DC to AC migration - Electric motors & generators engineering
2002年8月24日 · To eliminate the brush maintenance, the new General Manager wants to replace all the dc motors with vfd ac motors and some consultant have advised them to go in higher capacity ac motor to meet the "torque" requirement. So, now the client plans replace the 450 hp dc motor with 600 hp ac; 1500 dc motor with 2000 hp ac etc.
Conversion of DC Amps in to AC Amps - Eng-Tips
2022年3月7日 · AC RMS Amps will be approximately equal to DC amps out after filtering. No telling how your meter will display the effect of harmonics on the AC or DC sides of the rectifier. Most of the losses show up as voltage drop. However you need to know more to make a good rectifier selection. It is somewhat application specific.
Precharing of VFDs on a common dc-link 1 - Eng-Tips
2005年5月29日 · Further some inverters might rely on AC for auxilliary supply. (here the term inverter is used for the complete electronic part of the VFD like it is commonly used today. The more precise wording, used in the remainder of my post is: Converter or Rectifier: for AC-DC conversion Inverter: for DC-AC conversion )
DC Motors in Oil - Electric motors & generators engineering - Eng …
2002年4月29日 · Of course an of the shelf motor wouldn't be suitable for the job, but I'm sure that AC-servo-motors could be found for that application. Also regenerative breaking wouldn't be a problem in a baatery operated drive. The problem with the AC-motor would be that it is quite difficult to design an inverter suitable for operation at 150°C.
UPS Sizing - Electric power & transmission & distribution - Eng-Tips
2011年1月10日 · i am currently sizing a UPS system. the supply voltage is 525V, it goes through a transformer before it goes through the online double conversion UPS. the output voltage is 200/115VAC, i have worked out the load to be 150A and the backup standby is 2 hours. what is confusing me is, do i size...
DC to AC migration - Electric motors & generators engineering
2008年8月21日 · To eliminate the brush maintenance, the new General Manager wants to replace all the dc motors with vfd ac motors and some consultant have advised them to go in higher capacity ac motor to meet the "torque" requirement. So, now the client plans replace the 450 hp dc motor with 600 hp ac; 1500 dc motor with 2000 hp ac etc.
Commutating Reactance - Electric power & transmission ... - Eng …
2003年12月3日 · A high commutation reactance "rounds off" the steps in the ac side current, reducing harmonic currents. This is at the expense of a poorer power factor, and also gives the rectifier a poorer regulation characteristic. This is discussed in detail in chap 3 of Kimbark's book on High Voltage DC transmission. Dr K S Smith
AC over DC - Electric motors & generators engineering - Eng-Tips
2011年11月7日 · AC HV power to DC Very High Volt power conversion is very, very expensive for the facility and the converters; and those conversion losses reduce efficiency by a measurable amount at each end. A DC-DC VHV long-distance line can take advantage of the fact that the return circuit can be through the ground itself sometimes - so you need to build ...
Motor Rotation - Electric power & transmission & distribution
2004年5月18日 · " In some AC-AC power electronic converters without the bypass switch, it would be possible to interchange the input leads." If by "power converter" you mean a current source inverter, I agree, but don't think that enough of those are still sold new to risk the possible confusion. 99.99999% of inverters sold now are PWM, and swaping input leads ...