Purpose

The purpose of this paper is to investigate the transient performance of an induction machine coupled with a magnetic gear for industrial applications with low speed and high torque requirements. This new solution increases mechanical reliability and does not require maintenance and lubrication. The main objective is to study the direct-on-line starting ability of the electrical machine and its stability regarding a sudden change for the load torque.

Design/methodology/approach

A nonlinear analytical model for the induction machine and the magnetic gear is first developed. The model is then linearized around an operating point to obtain the transfer function between the load angle and the electromagnetic torque from which an analytical expression for the mechanical resonant frequency is obtained.

Findings

It is shown that the direct on-line starting is possible, if the moment of inertia of the load is not greater than a maximum value. Moreover, it is demonstrated that this new system present inherent overload protection.

Originality/value

A new high-performance direct-on-line starting electrical machine is proposed to achieve high torque at low speed without mechanical gear to improve reliability and reduce maintenance.

中文翻译：

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电磁齿轮感应电机的瞬态性能

目的

本文的目的是研究用于低速和高转矩要求的工业应用的感应电机与电磁齿轮的瞬态性能。这种新的解决方案提高了机械可靠性，并且不需要维护和润滑。主要目的是研究电机的直接在线启动能力及其在负载转矩突然变化方面的稳定性。

设计/方法/方法

首先建立了感应电机和电磁齿轮的非线性分析模型。然后将模型在工作点周围线性化，以获取负载角和电磁转矩之间的传递函数，从中可以得出机械共振频率的解析表达式。

发现

已经表明，如果负载的惯性矩不大于最大值，则可以直接在线启动。而且，证明了该新系统具有固有的过载保护功能。

创意/价值

提出了一种新型高性能直接在线起动电机，该电机在低速下无需机械齿轮即可获得高扭矩，从而提高了可靠性并减少了维护。