For motors having a journal with one or more groove regions and a shaft for relative rotation in the journal, aspects include providing a dual tapered shaft. The method according to the present invention may be implemented as a method for configuring a voltage controller once and for all, or it may be implemented as a method for adaptively adjusting a gain of a voltage controller. In particular embodiments, the glove is in a sleep mode in a substantially horizontal position and the light is illuminated in a substantially vertical position. Furthermore, the vocabulary dictionary may be implemented as an optimized dictionary to accurately recognize either Northern Mandarin Chinese speech or Southern Mandarin Chinese speech during the speech recognition procedure. The latching portion is detachably latched with the positioning portion via the deformation and returning to original shape of the resilient portion.