№73-25

Sensorless torque and power measurement in DC electric drive

V. Khilov¹, S. Fedorov¹

¹Dnipro University of Technology,Dnipro, Ukraine

Coll.res.pap.nat.min.univ. 2023, 73:278-287

https://doi.org/10.33271/crpnmu/73.278

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ABSTRACT

Purpose. Determination of the resistance torque and power on the working body of the executive mechanism of the DC electric drive in order to increase the efficiency of the working body by maintaining and stabilizing the flow of mechanical power on the motor shaft at a constant level. the features of the construction and operation of specific technological mechanisms for which it is necessary to determine the torque of resistance and power on the working body of the executive mechanism. The possibilities of sensorless measurement of mechanical parameters of direct current drive systems are investigated. The resistance torque and power on the working body of the executive mechanism of the DC electric drive in order to increase the efficiency of the working body by maintaining and stabilizing the flow of mechanical power on the motor shaft at a constant level are determination. With this approach, the working capacity of the working body increases due to the maintenance and stabilization at a constant level of the flow of mechanical power on the engine shaft. Achieving the maintenance of power at a constant level allows one to implement "soft" mechanical characteristics on the working body of the drive, which under certain conditions allows one to take into account the technological features of work and increase the efficiency of the technological tool.

The methods. The study was carried out on the basis of the ideas of modal synthesis of the observing device. According to this technique, an estimate for the state vector of the surveillance system is found. The state assessment was carried out on the basis of information about the input and output values of the system and its structure, which are known a priori. The use of a matrix mathematical apparatus made it possible to find the initial equations describing the dynamic processes in the control object.

Findings. On the basis of direct measurements of the operating values of the voltage and current of the DC drive motor, the mechanical parameters of the technological process, such as the mechanical moment of resistance and active power on the working body, are determined, according to which the control system is synthesized and the power flow is stabilized in the working area.

The originality. The dynamic parameters of the control system are set, which allow controlling the flow of mechanical power on the working body of the drive engine based on the specified torque of resistance.

Practical implementation. The use of a synthesized control system allows you to reliably determine the mechanical parameters of the technological process, stabilize them at an acceptable level, which will increase the efficiency of the working body. Having determined the mechanical parameters of the technological process, it is possible to synthesize a control system with torque and power regulators, which will lead to soft mechanical characteristics.

Keywords: motor voltage and current, resistance  torque  of the working mechanism, power flow, mechanical characteristics, asymptotic state identifier, control system.

References

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