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sensor. Frequency and flux (voltage or current, depending on the type of the drive) control signals are decoupled, with the flux control driven by the flux estimate, and the frequency control driven by the torque estimate and speed sensor data. The increased performance comes at the cost of
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that enables better handling of the transient processes. Low cost and simplicity keeps the scalar control in the majority of low-performance motors, despite inferiority of its dynamic performance; vector control is expected to become universal in the future.
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An open-loop V/f control works well in applications with near-constant load torque and gradual changes in rotational speed. The controllers implementing this method are sometimes called
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constant thus maintaining the motor performance across the range of speeds. A voltage boost at low frequencies is typically employed to compensate for the resistance of the coils.
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orientation inside the motor. Scalar control is based on equations valid for a steady-state operation and is frequently
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configuration) for better/faster transitional response, the common approach uses a rotational speed sensor (so called
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operation by manipulating the supply voltage or current ("magnitude") and the supply frequency while ignoring the
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difference that is combined with the direct reading of the speed sensor into a frequency control signal.
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Buja, G.S.; Kazmierkowski, M.P. (2004). "Direct Torque
Control of PWM Inverter-Fed AC Motors—A Survey".
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The variants of the scalar control include open-loop control and closed-loop control.
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The most common approach makes the voltage V proportional to frequency f (so called
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Bose, Bimal (2009). "The past, present, and future of power electronics ".
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With the current feedback in place, the motor can be driven using either a
453:(2). Institute of Electrical and Electronics Engineers (IEEE): 7–11, 14.
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336:(4). Institute of Electrical and Electronics Engineers (IEEE): 744–757.
307:(2). Institute of Electrical and Electronics Engineers (IEEE): 481–491.
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additional complexity and associated potential stability issues.
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The Field
Orientation Principle in Control of Induction Motors
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In a torque-control variant (TC, not to be confused with the
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is held constant in the steady-state, this requires a
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365:. Power Electronics and Power Systems. Springer US.
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424:. Eastern Economy Edition. Prentice Hall PTR.
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330:IEEE Transactions on Industrial Electronics
301:IEEE Transactions on Industrial Electronics
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292:Finch, John W.; Giaouris, Damian (2008).
103:). The speed error is passed through the
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486:This electricity-related article is a
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447:IEEE Industrial Electronics Magazine
359:"Scalar Control of Induction Motors"
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490:. You can help Knowledge (XXG) by
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294:"Controlled AC Electrical Drives"
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105:proportional-integral controller
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163:Buja & Kazmierkowski 2004
386:Chan, T.F.; Shi, K. (2011).
357:Trzynadlowski, A.M. (2013).
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35:(no sensing except for the
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151:Finch & Giaouris 2008
95:If sensors are utilized (
85:general purpose AC drives
101:closed-loop V/Hz control
23:is a way to achieve the
459:10.1109/mie.2009.932709
342:10.1109/tie.2004.831717
313:10.1109/tie.2007.911209
120:a.k.a. DTC), the motor
394:. IEEE Press. Wiley.
118:direct torque control
252:current-fed inverter
248:voltage-fed inverter
70:Constant Volts/Hertz
415:Bose, B.K. (2002).
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182:Trzynadlowski 2013
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62:V/f control
531:Categories
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407:2023-10-31
378:2023-10-29
133:References
467:1932-4529
350:0278-0046
321:0278-0046
276:Bose 2002
264:Bose 2002
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194:Bose 2009
56:Open-loop
33:open-loop
19:of an AC
286:Sources
126:current
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422:(PDF)
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