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Machine/drive circuit interactions in small variable-reluctance stepping and brushless DC motor systems

机译:小型可变磁阻步进和无刷直流电机系统中的机械/驱动电路相互作用

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摘要

The authors investigate the torque, losses, and efficiency of small brushless DC and stepping-motor systems, and explain how performance is influenced by excitation mode, drive circuit, and machine parameters. Quantitative deductions are made for a three-phase reluctance-type machine based on computed steady-state results. For a given machine and drive circuit, maximum torque is obtained with an excitation mode that allows each phase to be turned on for half of the complete excitation cycle. However, if maximum efficiency is the aim, phase excitation must occur for a shorter period, e.g. by exciting only one phase at a time. When making comparisons between drive circuits, the most important measure of drive-circuit capability is the circuit power available at low speeds. Drive circuits producing rapid current decay at phase turn-off benefit torque production in the two-phase-on excitation mode, but are detrimental with the one-phase-on mode. At high speed the pull-out torque depends on the unsaturated inductance parameters of the machine. For maximum torque these parameters must be correctly proportioned, their values being dependent on the excitation mode.
机译:作者研究了小型无刷直流和步进电动机系统的转矩,损耗和效率,并解释了励磁模式,驱动电路和机器参数如何影响性能。基于计算得出的稳态结果,对三相磁阻型电机进行了定量推导。对于给定的机器和驱动电路,在激励模式下可获得最大扭矩,该模式允许在整个励磁周期的一半时间内打开每个相。但是,如果以最大效率为目标,则相位激励必须在较短的时间内发生,例如在一次仅激励一个阶段。在比较驱动电路时,驱动电路能力的最重要衡量指标是低速时可用的电路功率。在相断开时产生快速电流衰减的驱动电路在两相接通励磁模式下有利于转矩产生,但对一相接通模式不利。在高速情况下,拉出扭矩取决于电机的不饱和电感参数。为了获得最大扭矩,这些参数必须正确地成比例,其值取决于励磁模式。

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