US 12,278,574 B2
System and process for controlling electric machines using a measuring circuit of the voltage of the electric machine
Denny Chiono, Saint Nicolas (IT)
Assigned to MAVEL EDT S.P.A, Pont Saint Martin (IT)
Appl. No. 17/801,288
Filed by MAVEL EDT S.P.A., Pont Saint Martin (IT)
PCT Filed Feb. 25, 2020, PCT No. PCT/IT2020/000025
§ 371(c)(1), (2) Date Aug. 22, 2022,
PCT Pub. No. WO2021/171324, PCT Pub. Date Sep. 2, 2021.
Prior Publication US 2023/0353073 A1, Nov. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/157 (2006.01); G01R 31/34 (2020.01); H02P 21/13 (2006.01); H02P 21/18 (2016.01); H02P 21/20 (2016.01)
CPC H02P 21/13 (2013.01) [G01R 31/343 (2013.01); H02P 21/18 (2016.02); H02P 21/20 (2016.02)] 8 Claims
OG exemplary drawing
 
1. A control system of an electric machine comprising:
a position sensor configured to detect an angular position of a rotor of the electric machine;
at least two alternate current sensors, each one of the alternate current sensors being configured to detect a value of an alternate current to an input phase to the electric machine, and being electrically connected to a phase of the supply circuit of the electric machine, the electric machine being electrically connected to an inverter configured to transform a continuous voltage supplied by the supply circuit into an alternate voltage for a power supply of the electric machine; and
a measuring circuit of a voltage of an electric machine comprising a first operational amplifier having its non-inverting input connected to a non-inverting input of at least one second operational amplifier, and the first operational amplifier further having its output feedback connected, through a resistance, to the inverting input, the inverting input of the first operational amplifier being further connected through a resistance to a first phase of the input current to an electric machine, the output of the first operational amplifier being connected, through a resistance, to the inverting input of a third operational amplifier which has its non-inverting input connected to a reference voltage, the output of the first operational amplifier being further connected to a first output of the circuit, which is at a voltage value equal to the voltage of a first phase of the electric machine to be measured, the third operational amplifier having its output feedback connected, through a capacitance, to its inverting input, the output of the third operational amplifier being further connected through a resistance to the non-inverting input of the first operational amplifier and to the non-inverting input of the second operational amplifier, the second operational amplifier comprising an output of the second operational amplifier feedback connected, through a resistance, to the inverting input, the inverting input being further connected through a resistance to a second phase of the input current to the electric machine, the output of the second operational amplifier being connected, through a resistance, to the inverting input of the third operational amplifier and being further connected to a second output of the circuit, which is at a voltage value equal to the voltage of a second phase of the electric machine to be measured.