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In order to improve the efficiency, we should know the loss characteristics of inverter-fed induction motors. We first have to accurately measure the total motor losses, and then obtain each loss component by reasonably separate the total motor losses. In this paper, the total losses of a 5.5 kW, a 22 kW, a 30 kW, a 37 kW, a 45 kW and a 55 kW induction motors under sinusoidal supply and PWM inverter...
Rotor losses in inverter-fed permanent magnet (PM) machines depend on stator current waveform and consequently on inverter output voltage. These losses can be very harmful due to the vulnerability of magnets to heat. In this study, the rotor losses in high-speed PM machines supplied by voltage-source PWM inverters were analytically correlated with the inverter switching parameters. An analytical model...
The paper presents the functional simulation model and performance analysis of permanent magnet synchronous motor (PMSM) drive. The control of PMSM is achieved using vector control technique which provides decoupled control of flux and torque. Using a proportional integral (PI) controller in the speed loop, a closed loop control scheme has been implemented and tested at different operating conditions...
This paper presents the new scheme for high-efficiency operation of PWM inverter-driven hysteresis motor with short-duration overexcitation. When the terminal voltage Vi of the hysteresis motor running at synchronous speed is continuously increased up to nVi (n > 1) and then continuously decreased to Vi, input currents are reduced and output power is increased at the same time. Because of this,...
This paper discusses the performance of a single-phase induction motor drive under nominal load in a closed-loop vector-controlled system. The control strategy to be applied is known as indirect field oriented control. Single-phase induction motor when operating as two-phase motor has its dynamic performance increased. With the use of a standard three-phase voltage-source inverter, space vector pulse...
Induction motors are most popularly used in modern day industrial drives. Under operating stresses and ageing, both stator and rotor of an induction motor undergoes degradation. It is necessary to properly assess the condition of motors on operation for reliable performance. Popularly employed technique for motor condition monitoring is the motor current signature analysis (MCSA) that deals with frequency...
An approach to discrete-time sliding-mode (SM) current control and conventional SM with smoothing filter is presented for field-oriented induction motor (IM) drives. Design of both proposed SM controllers is based on space vector PWM scheme by introducing some parts of the stator model as control input, which may correspond to voltage vector command. The control input was obtained employing the error...
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