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The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Mon, 22 Jul 2024 09:00:49 GMT2024-07-22T09:00:49ZControl Strategies for Non-sinusoidal Multiphase PMSM Drives in Faulty Modes under Constraints on Copper Losses and Peak Phase Voltage
http://hdl.handle.net/10985/15157
Control Strategies for Non-sinusoidal Multiphase PMSM Drives in Faulty Modes under Constraints on Copper Losses and Peak Phase Voltage
VU, Duc Tan; DOS SANTOS MORAES, Tiago Jose; SEMAIL, Eric; NGUYEN, Ngac Ky
In the context of future Permanent Magnet Synchronous Machines (PMSMs) with a high number of phases (>7) in integrated drives, this paper proposes several control strategies when multiphase PMSMs with non-sinusoidal back electromotive forces (back-EMFs) operate in healthy and open-circuit faults. In all operation modes, the considered constraint on current is related to the maximum root mean square (RMS) current allowable in one phase of the machine. The constraint on voltage limits the maximum peak value of the phase voltage determined by the DC-bus voltage of the converter. When one or two phases are open-circuited, to maximize torque and respect the constraints, new current references obtained by several proposed methods in rotating and natural frames are imposed to the machine. Due to the non-sinusoidal waveform of back-EMFs and the considered constraints, numerical computations based on analytical formulations are required to obtain maximal torque-speed characteristics, including the flux-weakening operation. The usefulness of the proposed strategies is verified by numerical and experimental results.
Tue, 01 Jan 2019 00:00:00 GMThttp://hdl.handle.net/10985/151572019-01-01T00:00:00ZVU, Duc TanDOS SANTOS MORAES, Tiago JoseSEMAIL, EricNGUYEN, Ngac KyIn the context of future Permanent Magnet Synchronous Machines (PMSMs) with a high number of phases (>7) in integrated drives, this paper proposes several control strategies when multiphase PMSMs with non-sinusoidal back electromotive forces (back-EMFs) operate in healthy and open-circuit faults. In all operation modes, the considered constraint on current is related to the maximum root mean square (RMS) current allowable in one phase of the machine. The constraint on voltage limits the maximum peak value of the phase voltage determined by the DC-bus voltage of the converter. When one or two phases are open-circuited, to maximize torque and respect the constraints, new current references obtained by several proposed methods in rotating and natural frames are imposed to the machine. Due to the non-sinusoidal waveform of back-EMFs and the considered constraints, numerical computations based on analytical formulations are required to obtain maximal torque-speed characteristics, including the flux-weakening operation. The usefulness of the proposed strategies is verified by numerical and experimental results.Optimal torque/speed characteristics of a Five-Phase Synchronous Machine under Peak or RMS current control strategies
http://hdl.handle.net/10985/19515
Optimal torque/speed characteristics of a Five-Phase Synchronous Machine under Peak or RMS current control strategies
DOS SANTOS MORAES, Tiago Jose; WU, Hailong; SEMAIL, Eric; VU, Duc Tan; NGUYEN, Ngac Ky
Torque density is usually improved by injecting the third current harmonic for five-phase permanent magnet synchronous machine (PMSM). It increases the degrees of freedom of a multiphase drive. However, it also separates the current limitations of the motor and the transistors, respectively related to the RMS and peak values of the currents. These two constraints are represented by Maximum Torque Per Ampere (MTPA) strategy and Maximum Torque Per Peak Current (MTPPC) strategy. In this paper, these two strategies are studied and analyzed in order to optimize the generated torque with injection of the third current harmonic. Torque improvement principle and the optimizing algorithm considering two constraints are illustrated. Then, the analytical results of these two strategies are compared and discussed. It is shown that injecting the third current harmonic can improve the torque especially at flux-weakening region. Besides, compared with MTPA, MTPPC could produce higher torque for the same inverter current limit.
Wed, 01 Jan 2020 00:00:00 GMThttp://hdl.handle.net/10985/195152020-01-01T00:00:00ZDOS SANTOS MORAES, Tiago JoseWU, HailongSEMAIL, EricVU, Duc TanNGUYEN, Ngac KyTorque density is usually improved by injecting the third current harmonic for five-phase permanent magnet synchronous machine (PMSM). It increases the degrees of freedom of a multiphase drive. However, it also separates the current limitations of the motor and the transistors, respectively related to the RMS and peak values of the currents. These two constraints are represented by Maximum Torque Per Ampere (MTPA) strategy and Maximum Torque Per Peak Current (MTPPC) strategy. In this paper, these two strategies are studied and analyzed in order to optimize the generated torque with injection of the third current harmonic. Torque improvement principle and the optimizing algorithm considering two constraints are illustrated. Then, the analytical results of these two strategies are compared and discussed. It is shown that injecting the third current harmonic can improve the torque especially at flux-weakening region. Besides, compared with MTPA, MTPPC could produce higher torque for the same inverter current limit.