Brushless DC Electric Motor
First Claim
1. A brushless AC electric motor that is connected to a power source and comprises an electromechanical converter with a three-section winding and a permanent-magnet inductor, an inverter, a control unit and three comparators (1st, 2nd and 3rd), wherein the terminals of the winding sections of said electromechanical converter are connected to the 1st, 2nd and 3rd outputs of the inverter, respectively, and to the 1st inputs of the 1st, 2nd and 3rd comparators, respectively, characterized in that said motor additionally comprises an electric motor start-up unit, wherein said control unit comprises six optron transmitters with optical outputs, while the inverter comprises six optron receivers, the optical inputs of said receivers being connected by means of optical coupling to corresponding optical outputs of said optron transmitters of the control unit, and wherein the outputs of the 1st, 2nd and 3rd comparators are connected to the 1st, 2nd and 3rd inputs of the control unit, respectively, while the 7th power input of the inverter is connected to the power supply source and to the input of the electric motor start-up unit, the 1st output of said start-up unit being connected to the 3rd input of the 2nd comparator, its 2nd output being connected to the 3rd input of the 3rd comparator, and wherein the 2nd inputs of all comparators are interconnected with each other.
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Accused Products
Abstract
The invention relates to electrical engineering and can be used, in particular, in electric drives of mechanisms used in dental equipment. A brushless DC 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 (1st (8), 2nd (9) and 3rd (10)), wherein the terminals of the winding sections of said electromechanical converter are connected to the 1st, 2nd and 3rd outputs of the inverter (6), respectively, and to the 1st inputs of the 1st (8), 2nd (9) and 3rd (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 1st (8), the 2nd (9) and the 3rd (10) comparators are connected to the 1st, 2nd and 3rd inputs of the control unit (7), respectively, while the 7th 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 1st output of said start-up unit (11) being connected to the 3rd input of the 2nd (9) comparator, its 2nd output being connected to the 3rd input of the 3rd (10) comparator, and wherein the 2nd inputs of all comparators are interconnected with each other. The present invention provides an increase of operational reliability and stability of the brushless DC electric motor, as well as reduction of the torque pulsations.
7 Citations
4 Claims
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1. A brushless AC electric motor that is connected to a power source and comprises an electromechanical converter with a three-section winding and a permanent-magnet inductor, an inverter, a control unit and three comparators (1st, 2nd and 3rd), wherein the terminals of the winding sections of said electromechanical converter are connected to the 1st, 2nd and 3rd outputs of the inverter, respectively, and to the 1st inputs of the 1st, 2nd and 3rd comparators, respectively, characterized in that said motor additionally comprises an electric motor start-up unit, wherein said control unit comprises six optron transmitters with optical outputs, while the inverter comprises six optron receivers, the optical inputs of said receivers being connected by means of optical coupling to corresponding optical outputs of said optron transmitters of the control unit, and wherein the outputs of the 1st, 2nd and 3rd comparators are connected to the 1st, 2nd and 3rd inputs of the control unit, respectively, while the 7th power input of the inverter is connected to the power supply source and to the input of the electric motor start-up unit, the 1st output of said start-up unit being connected to the 3rd input of the 2nd comparator, its 2nd output being connected to the 3rd input of the 3rd comparator, and wherein the 2nd inputs of all comparators are interconnected with each other.
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2. In a brushless AC electric motor having a power source forming an electromechanical converter hand having a three-section winding and a permanent-magnet inductor, an inverter, a control unit and three comparators (1st, 2nd and 3rd ), wherein the terminals of the winding sections of said electromechanical converter are connected to the 1st, 2nd and 3rd outputs of the inverter, respectively, and to the inputs of the 1st, 2nd and 3rd comparators, respectively, wherein the improvement comprises:
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an electric motor start-up unit; said control unit comprising six optron transmitters with optical outputs; said inverter comprising six optron receivers, wherein optical inputs of said receivers are operatively optically coupled to corresponding optical outputs of said option transmitters of said control unit; wherein the outputs of the 1st, 2nd and 3rd comparators are operatively connected to the 1st, 2nd and 3rd inputs of the control unit, respectively, and wherein a 7th power input of said inverter is connected to said power supply source and to the input of said electric motor start-up unit, and wherein said 1st output of said start-up unit is operatively connected to the 3rd input of the 2nd comparator, and wherein said 2nd output is operatively connected to the 3rd input of the 3rd comparator, and wherein the 2nd inputs of all comparators are interconnected with each other. - View Dependent Claims (3, 4)
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Specification