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This paper proposes a new power device combination that can reduce total power loss for a single-phase inverter reduced common-mode noise. In the proposed common mode voltage reduction PWM, to reduce the common-mode voltage of a single-phase inverter, the half bridge connected to the live end of the single-phase commetial power source perform PWM, and the other half bridge connected to the neutral...
For the sensorless control of a PM synchronous motor without using rotor position sensors, the information on the actual voltages and actual currents of the motor are required. In the model based rotor position estimator of a PM synchronous motor, the reference voltages, which are the output of the current controller, are commonly used. The reference voltages in over modulation regions for high speed...
In the present paper, a pulse width modulation (PWM) method that enables common-mode noise reduction in three-phase, three-level Vienna rectifiers is presented, and the losses in this system are compared and analyzed in relation to those of existing PWM methods. The proposed common-mode voltage reduction PWM method increases the number of times of switching compared to existing space vector modulation...
For the spinning operation in the washing machine, the unbalance weight of tub caused by unevenly distributed clothes should be measured. This paper proposes the unbalance weight detecting algorithm by measuring the torque ripple caused by unbalance weight. The proposed algorithm can detect unbalance weight at accelerated speed ranges as well as at constant speed since the torque ripple is detected...
A braking algorithm considering voltage limit condition for a PM synchronous motor at high speeds is presented. The phase resistors of stator windings are used as the braking resistors to dissipate the mechanical energy stored in the rotor. The dq current trajectory for maximum braking torque is analyzed under three constraints, the power limit, the current limit, and the voltage limit conditions...
Back emf harmonics of a PM synchronous motor is one of the major sources of the torque ripples. This paper presents the torque ripple reduction method for an interior PM synchronous motor that has back emf harmonics. To reduce the torque ripples due to the back emf harmonics, the harmonics of the back emf are analyzed through FFT analysis. The compensation dq currents to cancel the torque ripples...
The back emf harmonics of a PM synchronous motor is the main source of the torque ripples. The torque ripples make the mechanical vibration at low speeds and the acoustic noise at high speeds. The feed-forward harmonic currents compensation may reduce the torque ripples at low speeds, but the torque ripples at high speeds can't be reduced due to the limited bandwidth of the current controller. In...
In this paper, LLC series resonant converter with current-doubler as a rectification circuit for secondary side is proposed. The current-doubler circuit is generally used for the high voltage input and low voltage output application to get high efficiency characteristics with reduced transformer turn ratio. However, an inductive circuit is not used in a secondary side for the LLC series resonant converter...
A dead time of the PWM inverter for variable speed motor drives generates the distortion in the phase currents. The current distortion is one of the sources of torque ripples in a PM synchronous motor. In this paper, the effect of the dead time to the torque ripple of a PM synchronous motor is investigated. To reduce the current distortion caused by the dead time, the dead time compensation by the...
In this paper, new sensorless active damping method of the grid-connected LCL filter for a three-phase PWM inverter is proposed. The resonance component of capacitor voltage of LCL filter is observed by a simple MRAS (Model Reference Adaptive System) observer without additional sensors or circuits. The active damping is implemented by feed-forward compensation of the observed capacitor voltage for...
Generally, PHEV(plug-in hybrid electric vehicle) is driven by the engine, the primary traction motor, and the secondary auxiliary motor generating the electric power for battery charging. Secondary auxiliary motor should be connected to the engine or separated from the engine by the clutch system. This paper presents the position controller using BLDC motor for the clutch system of PHEV. BLDC motor...
This paper proposes the initial rotor position detecting algorithm of a PM synchronous motor using an incremental encoder. The proposed algorithm estimates the phase offset between the rotor magnet flux and the z-pulse of the incremental encoder by applying six aligning modes. The absolute rotor position for driving PM synchronous motor is calculated by using the phase offset of the z pulse and A,...
In this paper, a simple and low-cost open-circuit fault detection and identification method for a pulse-width modulated (PWM) voltage-source inverter (VSI) employing a permanent magnet synchronous motor is proposed. An open-circuit fault of a power switch in the PWM VSI changes the corresponding terminal voltage and introduces the voltage distortions to each phase voltage. The proposed open-circuit...
A new method to reduce 120Hz output voltage ripple of LLC resonant converter using resonant controller is proposed in this paper. In the proposed control method, the resonant controller can give very high gain at this frequency, so it can reduce 120Hz output voltage ripple significantly. Employing the resonant controller in software, along with the conventional PI controller, the proposed technique...
This paper presents a new single carrier wave comparison PWM method for 3 level 3 phase Vienna type rectifier. The theoretical background for the single carrier wave comparison PWM is presented. The model for this Vienna rectifier is reviewed briefly and the voltage unbalance problem according to the offset duty is analyzed. Finally, the simulation and experimental results prove the effectiveness...
The input voltage distortion in the three phase PWM rectifier is a main factor in the input current distortion and the voltage ripples across the DC link capacitor. This paper presents the MRAS(Model Reference Adaptive System) based input current harmonics reduction for the PWM rectifier under the input voltage distortion. The dq compensating voltages produced from the dq current difference between...
Heat radiation method by heat plate inlay water pipe is applied in this paper for 1.8 kW heat source of electric components. Heat plate inlay water pipe is effective in enduring water pressure. Changing water pipe's position for the better dissipation effect is investigated by Icepak 4.3 simulation tool. Also 2 types of pipe structure are suggested and heat radiation effect of each type is investigated...
The field of electric braking has focused its attention on braking force obtained by using a motor instead of a hydraulic brake which has been adopted by previous automobile systems. Electric braking is a system which consists of fewer numbers of components than previous hydraulic brakes, and it has effects of improved responsiveness and reduced braking distance for the ABS (anti-lock brake system)...
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