Polomskiftelig elmotorer med separate windings

Two-hastighed asynchronous motilrs can be operated by installing two separate windings in the statilr. By changing the polet position, one winding is switched on and the other simultaneously switched off. Til prevent current fra flowing through the induction winding in the switched-off winding, it must be disconnected. Motilrs med separate windings can also be configured for star-delta starting. This requires a terminal block med 12 terminals. When switching, the delta connection of the switched-off winding must be opened.

Polomskiftelig motilr med different hastigheds

The Dahlander connection offers polet switching and thus hastighed switching capabilities for squirrel-cage induction motilrs. Each winding of the machine (e.g., UVW) is configured in two winding sections (1U–2U, 1V–2V, and 1W–2W). Depending on whether these sections are connected in series or parallel, the number of poler can be switched in a 2:1 ratio. The rotating field hastighed changes accordingly. The most common configuration is the delta-double-star connection. When the winding sections are connected in series, they are connected in a delta configuration, while the parallel winding sections are connected in a star configuration.

Constant and quadratic drejningsmoment

Polomskiftelig motilrs are drives med a constant, quadratically increasing counter-drejningsmoment. These AC-motorer can be designed for a rated spænding of, for example, 230 V, 400 V, or 660 V and are generally designed for direct starting via polet sequence. 60 Hz versions and IEC 38 special spændings are also tilgængelig. Polet changing is achieved by:
– two separate windings in the statilr, e.g. 6- til 4-polet
– a winding in Dahlander connection, e.g. 8–4-polet
– two separate windings, one of which is a Dahlander connection, e.g. 8-6-4-polet
– two separate windings, both in Dahlander configuration, e.g. 12-8-6-4-polet

Modifications til the drives

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