發明
中華民國
106118990
I 664804
無感測器之電子剎車控制系統
國立中興大學
2019/07/01
本發明提供一種無感測器之電子剎車控制系統,其主要係藉由將習知無轉子位置感測器的磁場導向控制法之電路透過以剎車開關控制剎(車)驅(動)一體控制裝置使等效轉子角度為循序變化的負值,並控制切換部使電子控制部與可調式負載部電性連接,進而能夠透過消耗可調式負載部之反電動勢以使永磁無刷同步電機停止,以達到剎車之功效,而且,剎車之轉矩與永磁無刷同步電機之轉矩成比例,因此透過控制電子控制部特定電子開關的占空比,以達到進一步調整剎車轉矩之效。 This invention proposes an adjustable electromagnetic braking technique which can be applied to the permanent-magnet synchronous motors without the need of sensors. When there is no driving current entering the motor stator and the motor is remaining inertial rotation, it becomes a power generator with current generated in the opposite direction to the driving current, according to the Fleming’s left-hand rule, which causes a retarding force against motor’s forward rotation. When the preset braking condition is satisfied, the proposed braking control system activates. The back EMF is stored back to an ultra capacitor as the energy for braking the rotating motor. The field oriented control is applied to drive the motor reversely until the stored back EMF is exhausted. This will cause a significant braking effect. The braking force is adjustable by changing duty cycle of the switching components with pulse-width modulation (PWM) technique.
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