Abstract: A keyswitch module includes base plate, supporting mechanism movably disposed on the base plate in an up-and-down direction, and a keycap disposed on and movable with the supporting mechanism. The keycap includes a keycap body, a plurality of connecting features and at least one retaining feature. The keycap body has a top wall and a surrounding wall which extends downwardly from a periphery of the top wall. The connecting features are retainingly connected with the supporting mechanism. The retaining feature is adapted to be retainingly connected with a jig for a legend forming process.

Abstract: An open phase detection system and method for a three-phase motor is provided. The open phase detection system comprises: a signal generating unit coupled to the three-phase motor and configured to generate a driving signal for driving the three-phase motor; a detecting unit coupled to the signal generating unit, and configured to detect whether the signal generating unit generates the driving signal and to detect three-phase current values of the three-phase motor; and a determining unit coupled to the detecting unit, and configured to determine whether the three-phase motor has open phase according to the three phase current values detected by the detecting unit when the driving signal is detected.

Abstract: An open phase detection system and method for a three-phase motor is provided. The open phase detection system comprises: a signal generating unit coupled to the three-phase motor and configured to generate a driving signal for driving the three-phase motor; a detecting unit coupled to the signal generating unit, and configured to detect whether the signal generating unit generates the driving signal and to detect three-phase current values of the three-phase motor; and a determining unit coupled to the detecting unit, and configured to determine whether the three-phase motor has open phase according to the three phase current values detected by the detecting unit when the driving signal is detected.