Timeline for Controlling the reactive current of an PMSM in an open loop setting
Current License: CC BY-SA 4.0
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| Jul 17, 2021 at 12:01 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Mar 6, 2021 at 9:03 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
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| Jul 9, 2019 at 1:14 | answer | added | Van Godbold | timeline score: 1 | |
| Jun 27, 2019 at 6:58 | comment | added | raduur | Yeah it's definitely not a good sine, but I don't think its because of the PWM pattern. I testet the inverter on a passive RL load and it produced an almost perfect sine. But thanks anyway! | |
| Jun 26, 2019 at 23:09 | comment | added | user80875 | With nothing connected to the motor shaft, the only real power that is being delivered to the motor is due to motor losses. Even though there is no external excitation required for the rotor field, there is reactive power in the stator field. The power factor will naturally be low. In addition, it appears that your PWM pattern is not providing a very good simulation of a sine wave. As a result, there is a lot of harmonic content in the current waveform. The harmonic currents have the effect of low power factor. | |
| Jun 26, 2019 at 11:33 | history | edited | raduur |
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| Jun 26, 2019 at 11:26 | comment | added | raduur | I mean steady state, so no acceleration. At the moment no load is connected, so just the shaft is spinning. The motor is equal to this one: link. The inverter is self made and consists of these half bridge boards: link | |
| Jun 26, 2019 at 10:24 | comment | added | user80875 | By "stationary state," do you mean the shaft is prevented from turning or do you mean "steady state" - constant speed, neither accelerating nor decelerating? Is the shaft free or connected to a load? What kind of load? What is the motor rating plate information, rated voltage, frequency, current, speed or number of poles, mechanical output power? Are the voltages and currents balanced among the three phases? Is the inverter a commercial product? | |
| Jun 26, 2019 at 9:58 | comment | added | raduur | Yeah the performance would be better with FOC, no doubt. But as I tried to explain, closed loop control is not an option in my case. | |
| Jun 26, 2019 at 7:46 | comment | added | D.A.S. | You will get better performance under load disturbances with feedback. infineon.com/cms/en/product/power/motor-control-ics/… VFD is good but with FOC even better with PFC and current feedback to reduce reactive current. Hall and Angle sensors are used for most efficient sine drive. | |
| Jun 26, 2019 at 7:38 | comment | added | raduur | Thanks for your answer. Yes I know about FOC, but for my case I don't need a closed loop algorithm, but a deterministic control signal. I just want to put a voltage on it and want it to rotate, even though this is not the way you would normally do it. | |
| Jun 26, 2019 at 7:33 | comment | added | Marko Buršič | Have you ever heard about FOC algorithm? Also, for torque control a current control is nedded, voltage control is not so important for motor control. Why to reinvent warm water? | |
| Jun 26, 2019 at 7:30 | review | First posts | |||
| Jun 26, 2019 at 7:42 | |||||
| Jun 26, 2019 at 7:27 | history | asked | raduur | CC BY-SA 4.0 |