Study on the Generating Mechanism of a Parametric Oscillation in the Laminated Core Parametric Motor

自1979年以来，作者一直致力于开发和研究正交型铁心参数电机的实际应用，这种电机具有许多常规电机所没有的吸引人的特性。1995年，作者成功地制造了一种叠层铁心参数电机，可以使用传统的生产设备进行大规模生产。这种电机在输出和效率方面都与传统的单相感应电机相当。但在低速时，参数振荡在某些情况下变得不稳定，扭矩降至零。本研究对参数振荡的产生机理进行了研究，旨在找到稳定参数振荡的方法，解决低速运行时存在的问题。研究结果表明：(1)将叠层铁心参数电机定子成形成非对称形状，对稳定参数振荡，提高电机的输出和效率等特性是非常有效的。(2)定子内环的不对称性对电机的输出和效率等特性有影响。定子外环的不对称性对参数振荡的稳定性有影响。(3)当相邻磁极之间的夹角比基本的90度角偏移10~15度时，参数振荡趋于稳定，正反转区域消失，电机的输出功率和效率大大提高。(4)基于电机磁路模型得到的非线性微分方程式，对电机进行定性分析。参数振荡稳定的主要原因是一次磁通的一部分流入二次磁路。

Since 1979, the authors have been engaged in the development and research of practical applications for an orthogonal core parametric motor that offers numerous attractive features not found in conventional motors. In 1995, the authors succeeded in manufacturing a laminated core parametric motor that can be mass-produced using conventional production facilities. This motor is comparable to conventional single-phase induction motors with respect to both output and efficiency.However, at low speeds, a parametric oscillation has become unstable in some cases and the torque has dropped to zero. This is a serious problem for the practical use of the motor.In this research, the author has studied the generating mechanism of a parametric oscillation in order to find the method of stabilizing the parametric oscillation and solve the problems noted at low speeds.The following results were obtained :(1) Forming the stator of a laminated core parametric motor in an asymmetric shape is highly effective in stabilizing the parametric oscillation and in improving the motor characteristics like output and efficiency.(2) The asymmetry of the inner ring of a stator influences on the characteristics of the motor such as output and efficiency. The asymmetry of the outer ring of the stator influences on the stability of the parametric oscillation.(3) When the angle between adjacent magnetic poles is shifted by 10 to 15 degrees from the basic angle 90 degrees, the parametric oscillation is stabilized, the "normal-reverse rotation" region disappears, and the output and efficiency of the motor are largely improved.(4) The qualitative analysis of the motor was carried out based on the nonlinear differential equation obtained from the magnetic circuit model of the motor. The main reason of stabilization of the parametric oscillation is that a portion of the primary flux flows into the secondary magnetic circuit.