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大学・研究所にある論文を検索できる 「サーボモータ駆動可変速・可変容量油圧ポンプを用いた高効率電動油圧駆動システムに関する研究」の論文概要。リケラボ論文検索は、全国の大学リポジトリにある学位論文・教授論文を一括検索できる論文検索サービスです。
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サーボモータ駆動可変速・可変容量油圧ポンプを用いた高効率電動油圧駆動システムに関する研究

HA THAM PHAN 横浜国立大学 DOI:info:doi/10.18880/00014096

2021.11.24

概要

In recent years, as a measure against environmental problems in the field of industrial machinery, there is a demand for power saving of hydraulic power transmission in hydraulic equipment. In the conventional hydraulic control system, the high-pressure oil generated by the hydraulic pump is supplied to the hydraulic actuator via the fluid throttle of the hydraulic control valve to control the movement, but the excess flow rate of high pressure and power loss in the control valves are large due to the throttle. On the other hand, the Electrohydraulic Drive System (EHDS), which drives a hydraulic pump with an electric motor and supplies the required pressure and flow rate of hydraulic power directly to the hydraulic actuator without going through control valves, is highly efficient. It is attracting attention as a hydraulic power transmission method. Most EHDS have FS-VP (Fixed Speed Motor-Variable Displacement Pump), which controls the discharge displacement of a variable-displacement hydraulic pump driven by an electric motor, and VS-FP (Variable Speed Motor-Fixed Displacement Pump) is roughly divided into those that control the flow rate by controlling the rotational speed of a servo motor that drives a fixed-displacement hydraulic pump, but both have the problem that the overall efficiency of the system decreases with changes in operating conditions. Therefore, in this research, in order to solve this problem, two-degree control (VS-VP: Variable Speed Motor-Variable Displacement Pump) of displacement control of variable displacement hydraulic pump and rotational speed control of servo motor is proposed and the efficiency characteristics of both motor and pump are considered together to operate hydraulic power transmission at high efficiency over the entire operating range. This dissertation consists of six chapters, and the outline of each chapter is given below.

Chapter 1 clarified the position of this research by stating the background and purpose of this research and clarifying the research subjects.

In Chapter 2, the equations expressing the theoretical efficiencies of the servomotors and variable displacement hydraulic pumps that make up the VS-VP at various operating points are derived, and the efficiency map of the servomotor and the efficiency map of the variable displacement pump are shown respectively. By integrating both efficiency maps, we constructed an algorithm that outputs the servomotor speed and the discharge displacement of the variable displacement hydraulic pump at the operating point where the total efficiency of the system is the highest for the target pressure and target flow rate. Furthermore, it was revealed that VS-VP shows higher power transmission efficiency over the entire operating range compared to the conventional FS-VP and VS-FP.

In Chapter 3, the efficiency characteristics of the equipment to be actually used are expressed by applying the coefficients obtained from the measured efficiency results of the servomotor and pump to the coefficients included in the theoretical efficiency equation derived in Chapter 2. From these results, it was showed that efficiency maps can be generated. Using this efficiency maps, it was clarified that VS-VP shows higher power transmission efficiency over the entire operating range than FS-VP and VS-FP even in the actual machine.

In Chapter 4, by updating the efficiency maps applied to controller for changes in pressure target and flow rate target, the overall efficiency of the system can be maximized even for time-varying target inputs. It was shown that the rotational speed command and the swash plate angle command of the pump that determines the displacement of the variable displacement hydraulic pump can be generated, and the actual machines is controlled using these commands.

In Chapter 5, we proposed adding the functions of a servomotor to a conventional switched reluctance motor (SRM) that does not use a permanent magnet instead of the servomotor and a permanent magnet synchronous motor and showed the motor drive method. Furthermore, by integrating the efficiency characteristics of SRM and the efficiency characteristics of known pumps, this research showed the possibility of high-efficiency power transmission by controlling the two degrees of freedom of VS-VP even when using SRM to drive the pump.

Chapter 6 summarizes the results obtained in this research and describes future prospects.

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