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This paper elaborates the use of instantaneous voltage control method for control of torque in a five phase induction motor drive. In this method, instantaneous time modulating signals are generated, without the feedback of position of rotor, which enhances its easier implementation. These modulating signals being compared with triangular waves gives the required switching states input to the inverter...
Conventional direct torque control (DTC) of BLDC motor drive is quite cumbersome, because it operates on trapezoidal back EMF. The conventional DTC gives high torque ripple and switching frequency is variable due to bang-bang controllers. In this article, a new direct torque control scheme is proposed to a BLDC motor. This paper focuses to provide better direct torque control mechanism without using...
In this paper, an improved DTC scheme for five phase inverter fed induction motor is presented. The work present here aims to the development of conventional DTC to reduce the torque ripple. For this, a multi-band torque hysteresis controller is implemented as a modification in a conventional DTC mathematical model of 5 phase induction machine based on reference frame theory is also discussed in detail...
In this paper, an efficient speed control technique is proposed for Direct Torque Control(DTC) of Permanent Magnet Synchronous Machine(PMSM) drive in order to reduce the ripple content in torque and flux. Though conventional DTC gives fast dynamic response, it has noticeably high ripple content due to the variable operating frequency of the inverter especially at lower rpm. To enervate this issue,...
In this paper, a direct load angle (DLA) control method for three phase induction motor drives is proposed. It is based on control of incremental change in load angle. This method offers constant switching frequency at different operating conditions. The torque control is achieved without losing the benefits of direct torque control (DTC) by reference stator flux angle, which is sum of load angle...
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