在启动-制动系统中,通过频率调节感应电动机使电力消耗最小化

V. Volkov
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Using the methods of calculus of variations and simulation, the form of energy-saving tachograms was determined, which ensure, in start-braking regimes, the minimization of the total power consumption of this motor, loaded with a constant static torque. Results. Analytical calculated dependencies are proposed for determining the energy consumption in the start-braking regimes of a frequency-regulated squirrel-cage induction motor loaded with a constant static moment, for various types of trajectories of speed change. Analytical dependencies are obtained, by means of which a quantitative assessment of the influence of iron power losses of the investigated motor on the values of the stator current modulus and electrical power and energy losses in its stator winding is carried out under steady-state and start-braking regimes. With regard to the constant load of this motor, the minimization of the active energy consumed by it in the start and braking regimes has been performed. For start-braking regimes with the proposed quasi-optimal and known types of tachograms, the optimal durations of acceleration and deceleration times, at which the consumption of active energy by the induction motor is minimal. Originality. The \"U\"-shaped form of dependences of the total consumed energy by the frequency-regulated induction motor on the durations of the acceleration and deceleration times has been established. For start-braking regimes, the minimization of the total energy consumed by this motor was carried out and quantified, achieved through the use of energy-saving tachograms and optimal durations of acceleration and deceleration times. Practical value. 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引用次数: 1

摘要

Purpuse。为了最大限度地减少负载恒定静力矩的三相调频感应电动机启动制动时的总能耗,并考虑该电动机的铁功率损耗对其定子绕组中功率和能量损耗的影响。Metodology。基于计算该电机定子绕组中功率损耗的电气成分的数学依赖关系的建立相似性,由电机的铁功率损耗的影响或附加虚拟静力矩的应用引起,对分析依赖关系进行了改进,以确定电机在稳态和启动制动状态下消耗的总功率和能量。采用变分法和仿真的方法,确定了在起动制动工况下,保证恒静转矩载荷下电机总功耗最小的节能速度图形式。结果。针对不同类型的速度变化轨迹,提出了确定具有恒定静力矩的频率调节鼠笼式异步电动机启动制动过程中能量消耗的分析计算依赖关系。获得了分析相关性,通过定量评估所研究电机的铁功率损耗对定子电流模量和定子绕组的功率和能量损耗值的影响,在稳态和启动制动状态下进行。关于这台电机的恒定负载,它在启动和制动制度所消耗的主动能量的最小化已经执行。对于提出的准最优和已知类型的速度图的启制动制度,加速和减速时间的最佳持续时间,感应电动机的主动能量消耗最小。创意。已建立了频率调节感应电动机消耗的总能量与加减速时间持续时间的“U”形关系。对于启动-制动系统,通过使用节能速度图和最佳加速和减速时间,实现了该电机消耗的总能量的最小化并进行了量化。实用价值。对于启动和制动系统,对用于驱动立式板坯轧辊的变频调速短路感应电机的瞬态机电和能量过程进行了定量评估,并确定了该电机在这些系统中通过使用所提出的节能速度图实现的预期年度节能。图4,表5,参考文献19。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
MINIMIZATION OF ELECTRIC CONSUMPTION BY A FREQUENCY-REGULATED INDUCTION MOTOR IN START-BRAKING REGIMES
Purpuse. To minimize the total energy consumption in start-braking regimes of a three-phase frequency-regulated induction motor loaded with a constant static moment, as well as to take into account the effect of iron power losses of this motor on electrical losses of power and energy in its stator winding. Metodology. Based on the established similarity of mathematical dependences for calculating the electrical component of power losses in the stator winding of this motor, caused by the influence of iron power losses of the motor or the application of an additional fictitious static moment to it, the analytical dependences were refined to determine the total power and energy consumed by the motor in steady-state and start-braking regimes. Using the methods of calculus of variations and simulation, the form of energy-saving tachograms was determined, which ensure, in start-braking regimes, the minimization of the total power consumption of this motor, loaded with a constant static torque. Results. Analytical calculated dependencies are proposed for determining the energy consumption in the start-braking regimes of a frequency-regulated squirrel-cage induction motor loaded with a constant static moment, for various types of trajectories of speed change. Analytical dependencies are obtained, by means of which a quantitative assessment of the influence of iron power losses of the investigated motor on the values of the stator current modulus and electrical power and energy losses in its stator winding is carried out under steady-state and start-braking regimes. With regard to the constant load of this motor, the minimization of the active energy consumed by it in the start and braking regimes has been performed. For start-braking regimes with the proposed quasi-optimal and known types of tachograms, the optimal durations of acceleration and deceleration times, at which the consumption of active energy by the induction motor is minimal. Originality. The "U"-shaped form of dependences of the total consumed energy by the frequency-regulated induction motor on the durations of the acceleration and deceleration times has been established. For start-braking regimes, the minimization of the total energy consumed by this motor was carried out and quantified, achieved through the use of energy-saving tachograms and optimal durations of acceleration and deceleration times. Practical value. For start and braking regimes, a quantitative assessment of transient electromechanical and energy processes in a frequency-regulated short-circuited induction motor for driving vertical slab rolls was carried out and the expected annual saving of energy consumed by this motor in these regimes, achieved from the use of the proposed energy-saving tachograms, was determined. Figures 4, tables 5, references 19.
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