Variable speed control of single and two phase induction motors using a three phase voltage source inverter

Acionamento do motor de indução bifásico simétrico empregando modulação vetorial

“…Sabe-se que um dos méto-dos para a variação de velocidade do motor monofásico com capacitor permanente é retirar o capacitor do enrolamento auxiliar e considerá-lo como uma máquina bifásica (Blaabjerg, 2002;Holmes, 1993; Corrêa, 2003) e, desse modo, o motor seria alimentado por um inversor bifásico. O problema é que os enrolamentos do motor não são idênticos; devido à inserção do capacitor, que forma um circuito ressonante com a indutância do motor, o enrolamento auxiliar fica submetido a uma tensão maior e para tentar preservar a relação tensão/espira dos enrolamentos altera-se o enrolamento auxiliar.…”

Torque Behavior of One-Phase Permanent-Magnet AC Motor

“…4 shows a schematic structure of a three-phase PWM inverter used to operate the 1-phase permanent magnet motor as a balanced motor. The advantages and drawbacks of this solution when applied to a 1-phase induction motor are analyzed in [8]. The same control strategy pattern was employed for driving the tested 1-phase permanent magnet ac motor.…”

“…The analyzed solution in this paper is a PWM inverter fed motor. Through an appropriate control strategy [7], [8] by keeping the stator windings applied voltages de-phased with 90 electrical degrees and with the amplitude ratio equal to the effective turns ratio, the negative sequence voltage is zero. Fig.…”

“…The other possible solution is to supply the motor with 2-phase balanced voltages. This task is achievable through different configurations in a similar way to those already developed for the 1-phase induction motor case [7], [8], [11]- [13]. Generically, we can classify the configuration of the 1-phase ac permanent magnet motor according to the supply voltage system: unbalanced and balanced motors.…”

A Simplified Modulation Strategy for Three-leg Voltage Source Inverter Fed Unsymmetrical Two-winding Induction Motor

“…Although the independent control with unipolar or three-level PWM pattern is given, more switching devices significantly provide more cost, higher switching and conduction losses, and also lower system reliability. Therefore, few researchers [11][12][13] use the three-leg inverter. Even though the quality of PWM scheme is nearly the four-leg type, a special modulation strategy is dramatically required.…”