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In this paper, a position sensorless brushless direct current (BLDC) drive operation is described. Detection of back EMF zero crossing from line voltage difference is employed here for the sensorless drive operation. The line voltage difference gives an amplified version of back EMF which makes the sensorless operation possible. Low pass filters are used for eliminating the spikes in the wave form...
Permanent Magnet Synchronous Motors (PMSM) are good option for electric vehicles, hybrid electric vehicles and used for many industrial, aerospace and domestic applications. This paper presents hardware implementation of PMSM drive system without using any position sensor. An open loop control is implemented to operate PMSM at various speeds. Discussed basic theory of space vector PWM for generating...
This paper presents the vector control design of an axial-flux permanent magnet motor (AFPM) driven by a current source inverter (CSI), which is considered as having many advantages over the voltage source inverter. The control system consists of a 2-DOF speed controller, a multi-loop current controller, and an SVPWM modulation block, which can offer a faster dynamic response, an instantaneous adjustment...
This paper presents the application of carrier phase-shifted PWM technology in the position detection for permanent magnet synchronous motor at standstill position. At the same time, it gives the polarity identification in the rotary frame with detected position from the neutral voltage. The new technique describes the method of carrier phase-shifted PWM technology with neutral voltage. It can detect...
With reference to light railways transportation systems, in the paper a comparison is carried out between vehicles equipped with either Induction Motor Drive or Permanent Magnet Brushless Motor Drive. The attention is particularly focused on energetic performance, in term of losses and efficiency. The main characteristics of the traction units of the two compared vehicles have been chosen in accordance...
This paper presents the direct-torque control of a permanent magnet synchronous motor using four-switch three-phase inverter. The control of the four-switch inverter was developed based upon the orientation of four-switch space-vectors in the plane of six-switch inverter. The proposed inverter was successfully used in the direct-torque control of a PMSM. A dynamic model of a machine gives deep insight...
This paper presents a flux-weakening solution by employing the voltage boost capability of Z-source inverters to overcome the voltage limitation in conventional drives for high-speed applications, e.g. hybrid/electric vehicles. In this control strategy, a flux-weakening algorithm has been developed to achieve constant output power of an interior permanent magnet synchronous motor (IPMSM). Correspondingly,...
A novel Power Assist Recuperation System consisted of motor, inverter, DC-DC converter and 48V Li-ion battery has been presented for fuel saving of conventional Internal Combustion Engine and hybrid vehicles. As a total solution of the next-generation 48V PARS, key components such as Permanent Magnet motor, MOSFET power switching inverter and bi-directional DC-DC converter with cost competitiveness...
This paper designs a universal flux-weakening loop which enables the realization of the maximum speed in both cases: when the center of the voltage limit circle lies inside and outside of the current limit circle. This flux-weakening loop can be implemented in PMSM traction drives which require frequent switching between maximum power and continuous power modes by changing the current limit. Simulation...
A performance comparison study for a two- and three-level inverter based permanent magnet synchronous machine (PMSM) drive has been carried out. A novel space-vector pulse width modulation (SV-PWM) based DC-link voltage balancing algorithm is also presented, to drive the machine from three-level inverter. The proposed algorithm keeps the two DC-link capacitor voltages at their specific voltage tolerance...
This paper proposes speed ripple reduction for an interior permanent-magnet synchronous motor (IPMSM) controlling phase difference between the armature voltage and current. The IPMSMs are controlled with a rotor position sensor or by a sensorless control method. Voltage-current phase difference control is one of the sensorless drives with low cost and simple structure. However, if the load varies...
This paper presents a robust sensorless startup control method with self-commissioning for permanent magnet motors for smooth ramping speed up without reversing oscillations. Low cost sinusoidal PMSM motors used for fan and blower applications may have large parameter variations and static friction uncertainties. A reliable startup control with smooth operation thus becomes an indispensable requirement...
In this study, we propose a current-sensor-based predictive current control (CSBPCC) for six-switch three-phase (SSTP) inverter-fed synchronous reluctance motor (SynRM) drives. Generally speaking, two current sensors are used for detection of a- and b-phase stator currents of a SynRM drive system, respectively. In each sampling interval, the stator current will be read once rather than twice. After...
In this paper, motor drive system fed by single phase diode rectifier without Power Factor Correction (PFC) circuit is proposed. The motor drive considered in this paper consists of single phase diode rectifier, three-phase inverter, and small DC-link capacitor. Since DC-link capacitor is small, grid input current of the diode rectifier can be directly affected by electrical output power of the inverter...
Stepper motor drives exhibit advantages like open loop capability, high torque density and lower cost with respect to other brushless servo alternatives. However, the typical performances of conventional open loop stepper motor drives are limited, making them unsuitable where high speeds, fast dynamics and smooth motion is required. They are also easily prone to stall and usually produce loud audible...
This paper proposes a novel topology which is capable of operate two permanent-magnet synchronous machines (PMSM) using a single 6-bridge inverter and its control method. In the conventional parallel connection method for this application, two motors can operate only at the same speed and have a high risk of loss of synchronism since the single voltage is applied to both motors. In other inverter...
Asymmetrical multi-lane multi-phase motor drives are introduced in this paper. There are two conventional symmetrical drive systems for multi-phase motors. First one is modular phase multi-lane drive with single-phase inverters and second one is single-lane multi-leg inverter. While first one has high level of fault-tolerance, second one is a cost-effective solution. New class of drive systems, asymmetrical...
In this paper, a novel current controlled space-vector pulse width modulation (CCSVPWM) technique for reducing torque ripple in a three-level neutral-point-clamped (NPC) inverter fed trapezoidal brushless direct current (BLDC) motor is proposed. In BLDC motor, the different current slew rates between switching-in and switching-out phase generate current ripple, further leading to the generation of...
This paper deals with analysis and design of a speed controller for PMBLDC motor. The brushless DC motor has permanent-magnets on rotor and the stator windings are wound such that the back electromotive force is trapezoidal in nature. The control unit used is a PI controller, which governs the duty cycle of the PWM pulses applied to the switches of the inverter to run the motor at desired speed. The...
This paper deals with the modeling and analysis of multilevel inverter fed PMSM (Permanent Magnet Synchronous Motor) drive. The concept of hysteresis is applies to produce the controlled switching pulses to multilevel inverter and the concept of vector control is applied in PMSM to obtain linear dynamics similar to DC motor. The five level cascaded inverter fed PMSM drives are developed in MATLAB/SIMULINK...
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