Speed Control of Multiphase Cage Induction Motors Incorporating Supply Sequence

Abstract The subject of this paper is the control possibility of the multiphase cage induction motors having number of phases greater than 3. These motors have additional properties for speed control that distinguish them from the standard 3 phase motors: operation at various sequences of supplying voltages due to the inverter control and possible operation with few open-circuited phases. For each supply sequence different no load speeds at the same frequency can be obtained. This feature extends the motor application for miscellaneous drive demands including vector or scalar control. This depends mainly on the type of the stator winding for a given number of phases, since the principle of motor operation is based on co-operation of higher harmonics of magnetic field. Examples of operation are presented for a 9-phase motor, though general approach has been discussed. This motor was fed by a voltage source inverter at field oriented control with forced currents. The mathematical model of the motor was reduced to the form incorporating all most important physical features and appropriate for the control law formulation. The operation was illustrated for various supply sequences for “healthy” motor and for the motor operating at one phase broken. The obtained results have shown that parasitic influence of harmonic fields interaction has negligible influence on motor operation with respect to the useful coupling for properly designed stator winding.

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Analysis of Five Leg Voltage Source Inverter Fed Dual Motor Drive System

E3S Web of Conferences ◽

10.1051/e3sconf/202130901142 ◽

2021 ◽

Vol 309 ◽

pp. 01142

Author(s):

S P Harish ◽

S Sridhar ◽

Omsekhar Indela ◽

Kumaran G Kodeeswara ◽

P. Parthiban

Keyword(s):

Pulse Width Modulation ◽

Induction Motors ◽

Harmonic Distortion ◽

Speed Control ◽

Fault Analysis ◽

Drive System ◽

Voltage Source ◽

Voltage Source Inverter ◽

Modulation Techniques ◽

The Cost

With the advent of electric vehicle multi-machine drives are attaining overwhelming responses from the researchers and industries in recent years, as compared to their counterpart of single machine drive. In this regard, the industries are looking for multi motor control with single inverter system with precise speed control. The solution of aforesaid problem lies with multi-leg inverter fed dual induction motor drives that are capable for high power ratings and other specific applications. Any faults in the system leads to the failure of the operation of the entire drive system. Hence condition monitoring of the entire drive system becomes of paramount significance. Considering the aforementioned points, this paper focuses on the fault analysis of five leg voltage source inverter feeding dual induction motors. The drive system is simulated using MATLAB/ SIMULINK for different pulse width modulation techniques like SPWM, SVPWM and Two Arm Modulation (TAM) Techniques. The effect on fault in the inverter like opening of the switch and shorting the switch, on the performance of the induction motors are analysed. Total Harmonic Distortion (THD) of the stator current for different modulation techniques are compared for the analysis purpose. From the results it is observed that the THD is less for SVPWM techniques as compared with SPWM and TAM method. But independent control of both the machine cannot be attained by SPWM and SVPWM method. For independent speed control TAM method is used. So a trade-off has to be done considering the requirement and THD. It is finally concluded that independent speed control is achieved at the cost of higher THD.

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Field-oriented control of five-phase induction motor with open-end stator winding

Archives of Electrical Engineering ◽

10.1515/aee-2016-0029 ◽

2016 ◽

Vol 65 (3) ◽

pp. 395-410 ◽

Cited By ~ 3

Author(s):

Jacek Listwan ◽

Krzysztof Pieńkowski

Keyword(s):

Control System ◽

Induction Motor ◽

Voltage Source ◽

Field Oriented Control ◽

Stator Winding ◽

Control Methods ◽

Phase Voltage ◽

Voltage Source Inverter ◽

Indirect Field Oriented Control ◽

Cage Induction Motor

Abstract The mathematical model of the five-phase squirrel-cage induction motor and the system of the dual five-phase voltage source inverter have been presented. The control methods and control systems of the field-oriented control of the five-phase induction motor with an open-end stator winding are described. The structures of the direct fieldoriented control system (DFOC) and the Indirect Field-oriented control system (IFOC) with PI controllers in outer and inner control loops are analyzed. A method of space vector modulation used to control the system of the dual five-phase voltage source inverter has been discussed. The results of simulation studies of the field-oriented control methods are presented. Comparative analysis of the simulation results was carried out.

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