The　design　of　a　proximate　time-optimal　set-point　servo　(PTOS)　controller　is　presented　for　typical　double-integrator　servo　systems　with　disturbances.　The　controller　exercises　the　maximum　control　authority　for　fast　targeting　whenever　possible　and　then　switches　into　linear　control　for　smooth　settling.　An　integration　action　is　introduced　within　the　linear　working　region　so　as　to　remove　the　steady-state　error　caused　by　unknown　distur-　bances.　A　state　observer　is　adopted　to　estimate　the　un-measured　speed　signal　for　feedback　control.　In　the　presence　of　speed　constraint,　a　speed　regulation　stage　is　incorporated　be-　tween　the　PTOS　acceleration　and　deceleration　stages.　The　control　scheme　is　then　applied　to　the　position　regulation　in　a　permanent　magnet　synchronous　motor　servo　system.　Ex-　perimental　verification　has　been　conducted,　based　on　the　TMS320F28335　digital　signal　controller　board.　The　results　confirm　that　the　servo　controller　can　track　a　wide　range　of　set-point　targets　fast　and　accurately,　and　has　some　robustness　against　parameter　varia-　tions.　©　2015　ICIC　International.