초록 ▼

An apparatus for a pole change induction motor and control method for the same which are applicable to, for example, a driving source of an electric vehicle without power transmission are disclosed. In the control apparatus and method for the pole change motor is electrically changed between an n nu

An apparatus for a pole change induction motor and control method for the same which are applicable to, for example, a driving source of an electric vehicle without power transmission are disclosed. In the control apparatus and method for the pole change motor is electrically changed between an n number of poles and a 2n number of the poles (n=2, 4, - - - ) so as to secure an output torque of the pole change induction motor in a constant driving mode with a high rotation speed of the induction motor without increase in a dimension of either of the induction motor or an inverter associated with the pole change induction motor and without occurrence in a torque variation. In a preferred embodiment, two channels of exciting and torque instructions and slip frequency generators (current instruction calculating blocks and current control systems) are provided for the n number of pole driving and 2n number of pole driving.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus comprising:(a) a pole change induction motor adapted to change its number of poles between an n number of poles and a 2n number of poles, wherein n is equal to one of 2 and 4, and having stator windings, the stator windings including six lead terminals;(b) in

[ What is claimed is:] [1.] An apparatus comprising:(a) a pole change induction motor adapted to change its number of poles between an n number of poles and a 2n number of poles, wherein n is equal to one of 2 and 4, and having stator windings, the stator windings including six lead terminals;(b) inverter means for providing frequency controlled three-phase powers for two groups of said stator windings, each of the two groups comprising one of two groups of lead terminals, each group of lead terminals having three lead terminals;(c) measuring means for measuring a rotation speed of the pole change induction motor; and(d) controlling means for receiving the measured rotation speed (.omega.r) of said pole change induction motor and a speed instruction (.omega.r*), and controlling output phases derived from said inverter means to the stator windings via each of the two groups of lead terminals to provide one of(i) the same phases for the outputs of said inverter means; and(ii) phases of the output of the inverter means such that each phase of the outputs at respective phases of said inverter means is shifted sequentially by 2 .pi./3 for the two groups of lead terminals when said induction motor is driven in a constant power operation range and the rotation speed of the motor falls in a low speed range below a predetermined rotation speed, whereby the induction motor is driven with the number of poles being changed to the 2n number of poles.