IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0547364
(2012-07-12)
|
등록번호 |
US-8836256
(2014-09-16)
|
발명자
/ 주소 |
- Vilar, Zimin W.
- Tremel, Chris J.
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
8 |
초록
A drive system has a switched reluctance motor (SR motor) and a control system configured to determine an estimated total torque of SR motor as a function of the phase voltages and phase currents of the phases of the SR motor.
대표청구항
▼
1. A drive system, comprising: a DC bus,a switched reluctance motor (SR motor),a power inverter coupled electrically between the DC bus and the SR motor, the SR motor comprising phases each of which is operable in operational modes,a voltage sensor coupled electrically to the DC bus to sense a DC bu
1. A drive system, comprising: a DC bus,a switched reluctance motor (SR motor),a power inverter coupled electrically between the DC bus and the SR motor, the SR motor comprising phases each of which is operable in operational modes,a voltage sensor coupled electrically to the DC bus to sense a DC bus voltage of the DC bus and output a DC bus voltage signal indicative thereof,current sensors, each current sensor coupled electrically to a respective phase of the phases of the SR motor to sense a phase current of that phase and output a phase current signal indicative of that phase current, anda control system coupled electrically to the voltage sensor and the current sensors, the control system configured to control the power inverter so as to activate the phases sequentially in electrical cycles and so as to operate each phase selectively in the operational modes, the control system configured to: receive the DC bus voltage signal and the phase current signals,determine for each of the phases which one of the operational modes is active,with respect to each of the phases, determine a phase voltage of that phase according to a function that is dependent on which one of the operational modes is active for that phase so as to differ between the operational modes and that is dependent on the DC bus voltage and the phase current for that phase, anddetermine an estimated total torque of the SR motor with respect to an electrical cycle of the electrical cycles as a function of an estimated total energy outputted to a rotor of the SR motor by the phases during the electrical cycle by calculating a phase power for each phase as a product of the phase current for that phase and the phase voltage for that phase, integrating the phase powers with respect to time for the electrical cycle, and dividing by an electrical angle of the electrical cycle. 2. The drive system of claim 1, wherein, with respect to each phase: the power inverter comprises two switches associated with that phase, and the control system is configured to determine for that phase which one of the operational modes is active based on an opened-or-closed status of the two switches associated with that phase. 3. The drive system of claim 1, wherein, with respect to each phase: the power inverter comprises two switches and two diodes, the two switches and the two diodes are coupled electrically to a winding of the respective phase in an asymmetric half-bridge configuration, the operational modes comprise a first operational mode in which the first and second switches are closed, a second operational mode in which the first and second switches are opened, and a third operational mode in which only one of the two switches is closed, and the control system is configured to determine for that phase which one of the operational modes is active based on an opened-or-closed status of the two switches associated with that phase. 4. The drive system of claim 1, wherein: the operational modes comprise a first operational mode, a second operational mode, and a third operational mode, andwith respect to each phase, the control system is configured to calculate the phase voltage of that phase according to the following function:Vph=Vdc−IphRph when that phase is in the first operational mode,Vph=−Vdc−IphRph when that phase is in the second operational mode, andVph=−IphRph when that phase is in the third operational mode, where Vdc is the DC bus voltage, Vph is the phase voltage of that phase, Iph is the phase current of that phase, and Rph is a phase resistance of that phase. 5. The drive system of claim 4, wherein the control system is configured to calculate the estimated total torque with respect to the electrical cycle according to the following function: τ=12π∫(∑i=1nVph,iIph,i)ⅆt, where τ is the estimated total torque, n is the number of phases, i represents a phase among the n phases, Vph,i is the phase voltage of the phase i, Iph,i is the phase current of the phase i, and the integral term is the estimated total energy. 6. The drive system of claim 1, wherein the control system is configured to calculate the estimated total torque with respect to the electrical cycle according to the following function: τ=12π∫(∑i=1nVph,iIph,i)ⅆt, where τ is the estimated total torque, n is the number of phases, i represents a phase among the n phases, Vph,i is the phase voltage of the phase i, Iph,i is the phase current of the phase i, and the integral term is the estimated total energy. 7. The drive system of claim 6, wherein n=3. 8. The drive system of claim 1, further comprising a position sensor arranged to sense an angular position of the rotor relative to a rotation axis of the rotor and output a position signal indicative of the angular position, and the control system is coupled electrically to the position sensor and is configured to receive the position signal. 9. The drive system of claim 1, wherein the control system comprises a field programmable gate array (FPGA). 10. The drive system of claim 9, wherein the FPGA is configured to calculate the phase voltage of each phase. 11. The drive system of claim 9, wherein the FPGA is configured to calculate the estimated total torque with respect to the electrical cycle. 12. The drive system of claim 1 in combination with a traction element to which the SR motor is coupled. 13. The drive system of claim 5, wherein n=3.
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