ステップモータにおける中周波共振現象の解析 (<小特集>電磁力関連のダイナミックスと制御)

概要

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A new method is presented for analysing so-called mid-frequency resonance in a step motor, which is an unstable vibration arising from the interaction between rotor motion and coil current. Firstly, state equation in the time invariant form is derived using the rotating coodinate which is synchronous with the rotor. Secondly, a reduced-order model of 2nd order is obtained from the 4th-order state equation through modeling of a rotor fluctuation mode, in which a particular emphasis is placed on the low-frequency band of the torque transfer function. As a result, mid-frequenty instability can be analytically predicted from an approximated algebraic expression in closed form. Capability of the above approximated algebraic expression is demonstrated with an explanation for the difference of mid-frequency resonance between the hybrid-type motor and claw-type motor.
1992-12-25