This　article　reviews　and　compares　several　aspects　of　permanent　magnet　synchronous　motor　speed　control　method　of　the　anti-windup.　In　generally,　motor　control　aspects　of　the　state　equation　is　modeled　as　linear　systems　in　real-time　control　systems,　at　the　same　time　the　system　will　generate　much　higher　than　normal　current　and　voltage　values.　Therefore,　PI　control　is　likely　to　have　links　to　over-amplification　of　the　control　value,　This　phenomenon　is　called　over-saturation　of　the　motor,　The　existence　of　this　phenomenon　will　cause　the　system　to　non-normal　operation,　causing　system　instability.　So　we　will　see　in　the　article,　several　anti-saturation　control　algorithms,　they　will　be　in　permanent　magnet　synchronous　motor　sensorless　vector　control　algorithm　and　control　algorithm　for　anti-saturation　control　and　the　speed　controller　in　its　use,　to　reduce　saturated　part　of　the　motor　speed,　and　the　comparison　of　each　other.　©　2012　IEEE.