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In this paper, an improved control strategy (ICS) based on the duty ratio modulation, by properly matching the positive voltage vectors with the new zero voltage vectors (ZVVs), is proposed in direct torque control (DTC) of brushless DC motor (BLDCM). The traditional voltage switching table for the six switches of the converter is modified according to this strategy to minimize the torque ripple....
The stable operation regions are the important issues for direct torque control (DTC) system of permanent magnet synchronous motor (PMSM). The influences of the parameters, such as voltage, current, flux linkage and load angle, on the system operation are investigated through the analysis model presented in this paper. The analysis results show that the parameters must be properly regulated within...
Due to the changed parameters of double sided linear induction motor (DSLIM), the field oriented control (FOC) is not suitable in control and it will result in thrust fluctuation. The thrust control in the DSLIM is a better solution to suppress the thrust fluctuation. This paper establishes the dynamic model of DSLIMs according to the change principle of parameters and uses the model predictive thrust...
Five-phase tubular linear PM (TLPM) motors have high thrust force density, zero net radial force and volumetrically efficient. Conventional direct thrust control (DTC) improves the dynamic performance of TLPM motor, but exhibits significant ripple in thrust force and flux. To solve the problem, a new DTC strategy based on third-harmonic current suppression is proposed. The effect of inverter voltage...
This paper proposes a simple duty cycle modulated direct torque control (DDTC) for permanent magnet synchronous motors (PMSMs). DDTC sequentially output an active vector and a zero vector during each control period. The duty cycle of active vector is obtained using a duty cycle generator according to the torque error, which can avoid the complex calculation process associated with conventional DDTC...
This paper presents a 12-sector control method, based on the new zero voltage vectors (ZVVs), in direct torque control (DTC) of brushless DC motor (BLDCM). The 12-sector method can apply more new ZVVs in a single control period than the 6-sector method. As the new ZVVs play a key role with respect to preventing the freewheeling current in the switch off phase, this method is better qualified to avoid...
This paper investigates the harmonic voltage control strategy of direct torque control for five-phase induction generator (IG) system. In high/medium power applications, the generating function requires the performance of fast dynamic response, good static performance and high utilization of the dc bus voltage. For IG generating system, the direct torque control strategy has the advantages of easy...
Advanced machine control techniques, such as MPC and DB-DTFC, relies heavily on accurate machine parameters and inaccurate parameters can degrade control performance. Since machine parameters vary due to multiple factors, it is necessary to embed real-time parameter identification method into these control techniques. This paper is dedicated to exploring parameter identification method integrated...
This paper proposes an improved predictive torque control based on stator flux vector. By investigating the relationship among torque, the reference of stator flux magnitude and the phase angle of the stator flux, the reference vector of stator flux is designed. The desired deadbeat voltage vector is calculated based on the time delay compensation, which relieves the big calculation effort of conventional...
This paper presents the filter setting for expand the operation range of IPMSMs in overmodulation region of inverter. To operate IPMSMs in the overmodulation region, it is necessary to deal with harmonics components. In this paper BSF is utilized to suppress the harmonic components, and its setting method is mentioned. The operation range in the overmodulation region is expanded appropriately by setting...
To reduce the torque ripples of permanent magnet synchronous motor, this paper proposes a predictive sequence control (PSC) algorithm. Comparing with conventional predictive torque control, PSC takes different switching sequences applied to synthesize voltage vectors into account, and the switching sequence that produces minimum torque ripples will be selected by corresponding predictive algorithm...
The finite-control-set model predictive direct torque control (FCS-MPDTC) is a novel and promising control scheme for permanent magnet synchronous motors (PMSMs). An important feature of FCS-MPDTC is that the eight possible voltage space vectors or switching combinations of the power converters are directly taken into account as the control input of the system. Due to the considerable torque and flux...
The direct matrix converter has been regarded as a promising AC/AC conversion topology and it is being researched. Motor drives are one of the main potential applications of the matrix converter. This paper carries forward the application of matrix converters in AC motor drives using direct torque control (DTC). In the common DTC scheme for the matrix converter, two vectors with the maximum amplitudes...
This paper proposes an improved model predictive torque control (MPTC) method for an open-end winding permanent magnet synchronous motor (OEW-PMSM) with reduced computation time. First, a basic predictive torque control algorithm is derived, which is based on the discrete system model and cost function. Then, a direct torque control (DTC) based switching table is developed to reduce the computation...
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