The advantages of using frequency converters are well known. First of all, this is a significant energy savings due to the regulation of the rotational speed of the electric motor. In addition, ensuring a smooth frequency start using frequency converters significantly reduces thermal and mechanical loads when starting synchronous motors with a rotor excitation winding and with permanent magnets. In this paper, the start-up of a synchronous motor with a two-link frequency converter for various types of load was investigated. The following issues were considered: - creation of a three-phase two-link frequency converter model for a synchronous drive; - calculation of the torque on the shaft at rated power, as well as coefficients reflecting the nature of the load; - simulation of the start-up and operation of a synchronous motor and a two-link frequency converter with fan, conveyor and constant shaft loads. In conclusion, the model of a two-link frequency converter with a synchronous motor, which was researched in this paper, can be used in systems where the considered types of loads are used. This circuit has high energy characteristics, reliability and stability, and is also able to reduce the amplitude values of currents and time of transient processes at start-up
Keywords: two-link frequency converter, permanent magnet synchronous motor, mathematical model, reliability, PSIM
This paper describes the methods used to take into account the nonlinearity of magnetic processes in the steel of an electric asynchronous machine. This is required for some cases when these physical processes play an important role in the accuracy of data. Justifications are presented that prove the need to approximate the magnetization curve of asynchronous machines to improve the quality of regulation of the electric drive, as well as improve control by energy criteria. Work at full load or near it leads to a decrease in the magnetization EMF due to a voltage drop in the stator, this must be taken into account. The article also shows the approach of applying the methods of accounting for saturation in synchronous machines for asynchronous using transformed equations.
Keywords: induction motor, electricial drive, vector control, saturation curve fitting
Using the concept of the model-based design, this article considers the stages of generating the C-code of the engine control algorithm using the Embedded Coder and STM32 Embedded Target tools for Matlab/Simulink. For the example of the chosen stm32 microcontroller, its peripherals will be initialized and connected to the graphical model of the algorithm. In addition, a description of all the blocks and their functions of the resulting model is provided. At the last stage, the C code is generated, ready for loading it into the microcontroller and further controlling the motor as part of the electric drive.
Keywords: Model-based design, Matlab/Simulink, STM32, the control algorithm, STM32 Embedded Target, Embedded Coder
In this paper, we consider the simulation of a 5.1 kW synchronous electric motor with a two-link frequency converter with a control system that monitors the speed on the shaft in the PSIM simulation environment. IGBT M2TKI-50-12 manufactured by Elektrovypryamitel Saransk were selected for the load current. In this case, the load on the shaft abruptly changed from 1.25 to 2 of the nominal value. Presented are graphs of current, output power, motor speed and torque on the shaft.
Keywords: permanent magnet synchronous motor, PSIM, two-link frequency inverter, spasmodic load variation
This article describes the stages of modeling the state control algorithm for a synchronous motor with permanent magnets using the model-based design method. The algorithm is based on the principle of field oriented I-Hz control, the constructions of which is formed as a state machine for the correct planning of tasks. The model input and output signals for the STM32 microcontroller are further classified. The control model itself is created in the Matlab/Simulink package, the subsystems of which are also described. The last step is to model and visualize the input/output signals of the system at different initial values of the inverter speed and current. By observing acceptable values of the inverter speed and current in the steady state mode, the correct operation of the control logic is ensured, which can be generated as a C code and integrated into the microcontroller.
Keywords: Model-based design, Matlab/Simulink, STM32, synchronous motor with permanent magnets, field-oriented control
The trend of the transition of autonomous vehicles from internal combustion engines to electric drives leads to the need to find intermediate solutions. Hybrid transport is currently a fairly popular compromise. Improving its energy efficiency is possible in several ways. This article shows a software method based on dynamic programming, which allows you to optimize fuel consumption by separating the use of an internal combustion engine and an electric drive. Dynamic programming solves recursive optimization problems when sub-tasks are recounted several times. Also, in this work, mathematical modeling of the car’s movement pattern and determination of the optimal distribution of speed and battery charge depending on the number of fractional bits are carried out. The development of dynamic programming from the point of view of hardware implementation is possible using Field-Programmable Gate Array (FPGA).
Keywords: Hybrid transport, mathematical modeling, dynamic programming, programmable logic integrated circuits, internal combustion engine, electric drive
In modern industry, more common motor choice is a permanent magnet synchronous motor (PMSM). This becomes an urgent issue for the implementation of control scheme for such engines: their mathematical description and the further hardware implementation of algorithms for field programmable gate array or for microcontroller. In this article a mathematical model of PMSM control was created, including a power unit with an inverter and an engine, a FPGA based control circuit with its internal interconnections of digital elements and a feedback sensor. In the future work, this model can be taken as the basis in the hardware implementation of the PMSM control system using CAD, for example, in such as Altera's Quartus II.
Keywords: PMSM, mathematical description, PMSM control scheme, FPGA, Altera Quartus II