Direct torque control of a permanent magnet synchronous machine for hybrid hydraulic excavator

Chen, Qihuai; Lin, Tianliang; Ren, Haoling

doi:10.1049/iet-epa.2018.5180

Cited by 7 publications

(5 citation statements)

References 26 publications

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“…Apply Laplace transform to equations (2) and 3to obtain the transfer function of pressure and flow of the pump outlet.…”

Section: A Mathematical Model Analysis Of Electric Motor-pumpmentioning

confidence: 99%

“…Chen et al designed a power motor according to the working characteristics of hybrid CM, and tested the motor control method by adopting the vector control. The results showed that the dynamic characteristics of the power system and the energy savings of the system were improved [2]. Han et al employed a motor to replace the hydraulic motor of the hybrid excavator.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

SM-PI Control Strategy of Electric Motor-Pump for Pure Electric Construction Machinery

Ren

Zhou

et al. 2020

IEEE Access

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Although the pure electric drive system is widely applied to mobile machines, it is not easy for construction machinery (CM) to realize electrification because of the different working style. The CM load changes dramatically and continuously, and the traditional PI control cannot handle this condition. A vector control strategy based on speed sliding mode control (SMC) and torque PI control is proposed for CM with the characteristic of drastically changing loads. Based on the mathematical model of an electric motorpump, the electric motor-pump control performance requirement for electric CM is analyzed. Combined with the permanent magnet synchronous motor (PMSM) mathematical model, the speed SMC-PI observer is designed. The controller is designed using an exponential approximation method and uses integral and differential links, which has excellent robustness, to suppress flutter in SMC-PI. Control strategies of speed loops with PI and SMC-PI were compared under different conditions. The overshoot of the motor-pump speed was small and zero static control could be achieved. When the load was variable, the fluctuation of rotation speed was approximately 0.5% ∼ 1% with SMC-PI, which is only 25% ∼ 50% of PI control. Finally, the vector control algorithm based on speed SMC-PI was tested on a hydraulic excavator driven by the electric motor. The test results show that the vector control base on speed SMC-PI achieved a maximum static difference of rotational speed of approximately 1%. When the load power was close to 50% of the rated power, the electric motor-pump speed fluctuation range was −5% ∼ 5%, and the steady-state error was only approximately 0.3%.

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“…Apply Laplace transform to equations (2) and 3to obtain the transfer function of pressure and flow of the pump outlet.…”

Section: A Mathematical Model Analysis Of Electric Motor-pumpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

SM-PI Control Strategy of Electric Motor-Pump for Pure Electric Construction Machinery

Ren

Zhou

et al. 2020

IEEE Access

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“…The application of hybrid technology and energy recovery technology in hydraulic excavators is divided into two categories. One is an electric hybrid excavator, and the other is a hydraulic hybrid excavator [17,18] . The energy storage unit of an electric hybrid excavator is a battery or ultracapacitor.…”

Section: Introductionmentioning

confidence: 99%

“…When the energy is reused, the electrical energy is converted into hydraulic energy, which drives the hydraulic pump to work. The energy storage unit of the hydraulic hybrid excavator is a hydraulic accumulator [18] . The hydraulic accumulator stores the boom potential energy and rotational kinetic energy in the form of hydraulic energy.…”

Section: Introductionmentioning

confidence: 99%

Novel control strategy for the energy recovery system of a hydraulic excavator

Changsheng,

Qinghua,

Qijun

et al. 2024

International Journal of Agricultural and Biological Engineering

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The energy saving of hydraulic excavators is always an essential research. An energy recovery system can effectively recover the boom potential energy and rotational kinetic energy. Based on the standard working cycle of hydraulic excavators, a dynamic programming (DP) control strategy for hybrid hydraulic excavators was proposed to recover the boom potential energy and rotational kinetic energy. The hybrid hydraulic excavator simulation model was built by Simulink software. The simulation results indicated that the fuel consumption of hybrid hydraulic excavators using the DP control strategy was about 21.3% lower than that of the conventional hydraulic excavator. In order to experimentally verify the simulation results, an experimental platform for hybrid hydraulic excavators was built. The experimental results indicated that the fuel consumption of hybrid hydraulic excavators using the DP control strategy was about 18.9% lower than that of the conventional hydraulic excavator. This paper shows that the DP control strategy applied to hybrid hydraulic excavators can recycle the boom potential energy and rotational kinetic energy, and reduce the fuel consumption of hybrid hydraulic excavators.

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“…The simple structure of permanent magnet synchronous motors (PMSMs) combined with their useful features like high efficiency and high power‐density make them ideal for use in aerospace applications, transportation and industrial manufacturing [1–3]. It is possible to vary the air‐gap magnetic flux density, back electromotive force and torque characteristic of the motor using different types of stator slots.…”

Section: Introductionmentioning

confidence: 99%

Influence of the opening width of stator semi‐closed slot and the dimension of the closed slot on the magnetic field distribution and temperature field of the permanent magnet synchronous motor

Tang

Zhang

Yu³

et al. 2020

IET Electric Power Applications

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The structure of a permanent magnet synchronous motor (PMSM), more precisely, its shape and dimension of the stator slot can change the magnetic field distribution of the stator tooth and the yoke. In addition, it also affects the magnetic field distribution in the air‐gap and the electrical loss in the rotor. As a result, there is an effect on the motor's internal temperature distribution. This study aims at investigating the influence of stator slot dimension on the performance of the motor. To this extent, a field‐circuit coupled model combining the vector control strategy with motor finite element model is proposed. Based on this model, the impact of using various opening widths of semi‐closed slot and the dimension of the closed slot on both magnetic field distribution and loss in the PMSM is studied in detail. Furthermore, by considering the calculated loss as a heat source, the temperature variation of the stator core, winding, magnetic bridge and permanent magnet of the motor for different scenarios of slot dimensions can be obtained by using a three‐dimensional temperature field model at steady‐state. An experimental platform is established to validate the model this provides a theoretical support for the analysis of the results.

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Direct torque control of a permanent magnet synchronous machine for hybrid hydraulic excavator

Cited by 7 publications

References 26 publications

SM-PI Control Strategy of Electric Motor-Pump for Pure Electric Construction Machinery

SM-PI Control Strategy of Electric Motor-Pump for Pure Electric Construction Machinery

Novel control strategy for the energy recovery system of a hydraulic excavator

Influence of the opening width of stator semi‐closed slot and the dimension of the closed slot on the magnetic field distribution and temperature field of the permanent magnet synchronous motor

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