| 摘要 |
The invention relates to electrical engineering and can be used, in particular, in electric drives of mechanisms used in dental equipment. A brushless AC electric motor comprises an electromechanical converter (1) with a three-section (2, 3, 4) winding and a permanent-magnet inductor (5), an inverter (6), a control unit (7) and three comparators (1 st (8), 2 nd (9) and 3 rd (10)), wherein the terminals of the winding sections of said electromechanical converter are connected to the 1 st , 2 nd and 3 rd outputs of the inverter (6), respectively, and to the 1 st inputs of the 1 st (8), 2 nd (9) and 3 rd (10) comparators, respectively, said motor additionally comprising an electric motor start-up unit (11); and wherein said control unit (7) is a decoder and comprises six optron transmitters (12, 13, 14, 15, 16 and 17) with optical outputs, while the inverter comprises six optron receivers (18, 19, 20, 21, 22 and 23), the optical inputs of said receivers being connected by means of optical coupling to corresponding optical outputs of said optron transmitters (12, 13, 14, 15, 16 and 17) of the control unit (7), and wherein the outputs of the 1 st (8), the 2 nd (9) and the 3 rd (10) comparators are connected to the 1 st , 2 nd and 3 rd inputs of the control unit (7), respectively, while the 7 th power input of the inverter (6) is connected to the power source and to the input of the electric motor start-up unit (11), the 1 st output of said start-up unit (11) being connected to the 3 rd input of the 2 nd (9) comparator, its 2 nd output being connected to the 3 rd input of the 3 rd (10) comparator, and wherein the 2 nd inputs of all comparators are interconnected with each other. The present invention provides an increase of operational reliability and stability of the brushless AC electric motor, as well as reduction of the torque pulsations. |
