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    • 2. 发明专利
    • Electric machine with variable number of poles
    • CH618295A5
    • 1980-07-15
    • CH1154176
    • 1976-09-10
    • CHATELAIN JEANTU XUAN MAI
    • CHATELAIN JEAN PROFXUAN MAI TU
    • H02K17/14H02K19/12H02K19/32
    • The changing of the number of poles of this three-phase machine makes it possible to obtain different speeds of rotation at constant supply frequency or different frequencies (for example 50/60 Hz) at constant or virtually constant speed of rotation. The winding includes 9 coiling elements connected together so as to obtain by choice the combinations of polarities m(3k-1)/m(3k+1) for 2 different polarities and m(3k-2)/m(3k)/m(3k+2) for 2 or 3 different polarities, with k and m being positive integers. The polarity term denotes the number of poles when there is an even number thereof and the number of pairs of poles when there is an odd number thereof. The coiling arrangement is obtained from a basic coiling designed for the medium polarity 3k and including 9k groups of coils. Each phase winding of the machine is formed of 3 elements belonging to the three phases respectively of this basic coiling and joined together differently for each polarity. For example, the elements [E1], [E5], [E9], respectively [E2], [E6], [E7] and [E3], [E4], [E8] are joined to obtain the polarity m(3k-1). The elements [E1], [E8], [E6], respectively [E2], [E9], [E4] and [E3], [E7], [E5] are joined to obtain the polarity m(3k+1). The switchable three-phase machine, whose stator or rotor winding (or both) is produced in this manner, exhibits, for the various polarities, high coiling factors comparable with those of a single-polarity machine, perfect symmetry of the induced voltage and magnetomotive force system, at the price of an economically acceptable complication to the connections.