| 摘要 |
<p>A brushless electric motor comprising a rotor (1) and a stator (3) with n separate sections (3a, 3b), each carrying n serially connected polyphase windings (6), each stator section (3a) being pivotally connected to the motor frame and to an adjacent stator section, allowing their displacement from a collapsed configuration preventing the rotor rotation to an expanded configuration allowing for the rotation of said rotor (1), and with resilient means (8) provided between adjacent stator sections for urging them towards said expanded configuration with a force lower than the collapsing force of the permanent magnets (1a, 1b, ..) when said motor is energized. There are further disclosed a method for controlling the current component (1d) of the motor current vector for releasing the breaking action of the stator (3) against the rotor (1), and a gearless machinery for an elevator system using the field generated by the said motor permanent magnets to brake the rotor shaft by deforming a stator (3) comprising a plurality of hinged sections (3a, 3b), and releasing the brake by modulating the direct motor current Id while the quadrature current Iq is controlled to obtain the required motor torque.</p> |
