公开(公告)号：US3560834A

公开(公告)日：1971-02-02

申请号：US3560834D

申请日：1968-12-26

Applicant: BORG WARNER

Inventor： STUDTMANN GEORGE H

IPC: G05F1/12 ,  H02M1/08 ,  H02P25/04 ,  H02P27/06 ,  H02P27/08 ,  H02P5/40

CPC classification number: H02P27/06 ,  H02M1/08 ,  H02P27/047 ,  H02P27/08 ,  H02P2201/03

Abstract: AN OSCILLATOR APPLIES TIMING SIGNALS TO AN INVERTER LOGIC ARRANGEMENT FOR GOVERNING THE FREQUENCY OF THE INVERTER OUTPUT A-C VOLTAGE SUPPLIED TO A MOTOR. THE AMPLITUDE OF THE A-C VOLTAGE APPLIED TO THE MOTOR IS ADJUSTED BY SUITABLE CONTROL MEANS WHICH RECEIVES A REGULATING SIGNAL FROM A COMPARATOR. A FIRST SIGNAL CHANNEL INCLUDES A FEEDBACK NETWORK, AND APPLIES TO THE COMPARATOR A FIRST CONTROL SIGNAL WHICH INDICATES THE EFFECTIVE AMPLITUDE OF THE INVERTER VOLTAGE. A SECOND SIGNAL CHANNEL IS CONNECTED BETWEEN THE OSCILLATOR AND THE COMPARATOR TO PROVIDE A SECOND CONTROL SIGNAL RELATED TO THE FREQUENCY OF THE OSCILLATOR OUTPUT. THE COMPARATOR OUTPUT SIGNAL IS A FUNCTION OF BOTH AMPLITUDE AND FREQUENCY, AND DRIVES THE CONTROL MEANS TO MAIN A PRESET RATIO BETWEEN AMPLITUDE AND FREQUENCY OF THE A-C VOLTAGE PASSED TO THE MOTOR.

公开(公告)号：US3317805A

公开(公告)日：1967-05-02

申请号：US31804963

申请日：1963-10-22

Applicant: AMERICAN MACH & FOUNDRY

Inventor： MARTIN KAY ,  THOMAS MCCALLUM

IPC: G06F7/68 ,  H02M1/084 ,  H02P27/06

CPC classification number: H02P27/06 ,  G06F7/68 ,  H02M1/0845 ,  H02P27/047 ,  H02P2201/03

公开(公告)号：US20230231504A1

公开(公告)日：2023-07-20

申请号：US17994688

申请日：2022-11-28

Applicant: Hamilton Sundstrand Corporation

Inventor： Pravinsharma Kaliyannan Eswaran ,  Nageswara Rao Kalluri ,  David Frederick Brookes ,  Sridhar Katakam ,  Surendra Somasekhar Valleru

IPC: H02P27/08

CPC classification number: H02P27/08 ,  H02P2201/03

Abstract: A motor drive system includes a direct current (DC) bus that provides a DC link voltage across a DC link capacitor, and a split DC link mid-point circuit connected in parallel with the DC link capacitor. The split DC link mid-point circuit establishes a mid-point reference based on the DC link voltage. A power inverter is in signal communication with the DC bus. The power inverter includes one or more gate driver units configured to drive one or more corresponding switches. Each gate driver unit includes a mid-point ground connection that is connected to the mid-point reference. The split DC link mid-point circuit can define a voltage divide that establishes the mid-point reference and can be used to monitor the DC link voltage.

公开(公告)号：US11658594B2

公开(公告)日：2023-05-23

申请号：US16658772

申请日：2019-10-21

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Boris Henry Rocha Mercado ,  Jorge Fabian Soria Ortiz ,  Hector Javier Herrera ,  John Thanh Nguyen ,  Nam Thanh Tran ,  Joel Keith Trombley ,  Randall John Kleen

IPC: H02P9/08 ,  F01D15/10 ,  F01D17/06 ,  F02D31/00 ,  F03D7/04 ,  G05B13/04 ,  H02P101/25

CPC classification number: H02P9/08 ,  F01D15/10 ,  F01D17/06 ,  F02D31/001 ,  F03D7/045 ,  G05B13/04 ,  F05D2220/76 ,  G05B2219/2619 ,  H02P2101/25 ,  H02P2201/03

Abstract: A control system for a power generation system includes a generator coupled to a turbine via a shaft. The control system includes a memory storing instructions. The control system also includes a processor coupled to the memory and configured to execute the instructions. When the instructions are executed it causes the processor to receive a direct current (DC)-link voltage from an automatic voltage regulator (AVR), wherein the AVR is configured to control voltage characteristics of the generator, and to determine a speed of the generator based on the DC-link voltage.

公开(公告)号：US20230143105A1

公开(公告)日：2023-05-11

申请号：US17918611

申请日：2021-06-29

Applicant: FANUC CORPORATION

Inventor： Youichirou Ooi ,  Koujirou Sakai

IPC: G01R31/12 ,  G01R31/34 ,  H02P23/14 ,  H02P27/08

CPC classification number: G01R31/12 ,  G01R31/34 ,  H02P23/14 ,  H02P27/08 ,  H02P2201/03

Abstract: A motor drive device 1 is provided with: a converter unit 11 which converts input alternating-current power into direct-current power and outputs the same to a DC link; a DC link capacitor 4; voltage dividing resistors 13-1, 13-2 which are connected in series with one another and which are provided between a positive potential line and a negative potential line of the DC link; a measurement resistor 14 connected between the connecting point of the voltage dividing resistors 13-1 and 13-2 and the positive potential line or the negative potential line of the DC link; a resistance voltage measuring unit 15 for measuring the resistance voltage across the measurement resistor 14; a direct current component extracting unit 16 for extracting the direct current component of the resistance voltage; an alternating current component extracting unit 17 for extracting the alternating current component of the resistance voltage; a DC link potential measuring unit 18 for measuring the positive potential and the negative potential of the DC link; and an insulation resistance value calculating unit 19 for calculating the insulation resistance value of a motor 3 on the basis of the direct current component and the alternating current component of the resistance voltage, and the positive potential and the negative potential of the DC link.

公开(公告)号：US20190068097A1

公开(公告)日：2019-02-28

申请号：US15692898

申请日：2017-08-31

Applicant: Eaton Corporation ,  Zhejiang University

Inventor： Huaqiang Li ,  Wenxi Yao ,  Zhentian Qian

IPC: H02P21/05 ,  H02P21/16 ,  H02P25/024 ,  H02P27/12 ,  G05B19/416

CPC classification number: H02P21/05 ,  G05B19/416 ,  G05B2219/49048 ,  G06F17/13 ,  H02P21/00 ,  H02P21/16 ,  H02P25/024 ,  H02P27/06 ,  H02P27/12 ,  H02P2201/03 ,  H02P2205/07

Abstract: A control system for actively damping an output of an adjustable speed drive (ASD) having a DC link thin film capacitor is programmed to calculate a d-axis damping coefficient and a q-axis damping coefficient for stabilizing an output of the ASD based at least on a voltage across the DC link thin film capacitor at a steady operating point. The control system is further programmed to extract d-axis and q-axis perturbations in d-axis and q-axis output currents of the ASD using a high pass filter, damp the d-axis perturbation and the q-axis perturbation with the d-axis damping coefficient and the q-axis damping coefficient, respectively, and calculate a damping frequency based on the damped d-axis perturbation and the damped q-axis perturbation. The control system is also programmed to damp an angle of rotation of a reference motor speed command for controlling the ASD using the damping frequency.

公开(公告)号：US20180287539A1

公开(公告)日：2018-10-04

申请号：US15938420

申请日：2018-03-28

Applicant: GRUNDFOS HOLDING A/S

Inventor： Klaus VESTERGAARD KRAGELUND ,  Jan PLOUGMANN ,  Jan CARØE AARESTRUP

IPC: H02P23/00 ,  H02P25/024 ,  H02P25/16 ,  H02P27/08 ,  H02P29/40 ,  F04D15/00 ,  F04D13/06

CPC classification number: H02P23/009 ,  F04D13/06 ,  F04D15/0066 ,  F04D15/0088 ,  H02P21/0089 ,  H02P25/024 ,  H02P25/16 ,  H02P27/085 ,  H02P29/40 ,  H02P2201/03 ,  H02P2207/05

Abstract: A pump assembly (1) includes a pump unit (2) capable of providing a desired head (H0) at zero flow rate, a brushless speed-controlled permanent-magnet AC drive motor (205) for driving the pump unit (2), and a control unit for controlling the drive motor (205). The control unit includes a frequency converter configured to receive an input voltage (Uin). The drive motor (205) is operable in a field-weakening mode and non-field-weakening mode. The drive motor (205) is undersized for driving the pump unit (2) at a design input voltage (U0) to provide a lower head (H) than the desired head (H0) at zero flow rate in the non-field-weakening mode and for driving the pump unit (2) to provide the desired head (H0) at zero flow rate in the field-weakening mode.

公开(公告)号：US20180241316A1

公开(公告)日：2018-08-23

申请号：US15896317

申请日：2018-02-14

Applicant: FANUC CORPORATION

Inventor： Shinichi HORIKOSHI ,  Yuuya NAKAGAWA

IPC: H02M5/458 ,  H02P27/08 ,  H02M1/42

CPC classification number: H02M5/4585 ,  H02M1/4233 ,  H02M2001/007 ,  H02P27/08 ,  H02P27/085 ,  H02P2201/03 ,  H02P2201/07 ,  Y02B70/126

Abstract: A motor drive device that inputs AC power from a power supply to drive a motor includes: a converter that converts the AC power from the power supply into DC power; a DC/DC converter that generates DC power produced by stepping-up, stepping-down, or stepping-up and stepping-down the DC power from the converter; an inverter that converts the DC power from the DC/DC converter into AC power and supplies to the motor; and an electrical storage capacitor that is provided between the DC/DC converter and the inverter.

公开(公告)号：US09954426B2

公开(公告)日：2018-04-24

申请号：US15196287

申请日：2016-06-29

Applicant: FANUC CORPORATION

Inventor： Wataru Kuroki

IPC: H02P27/00 ,  H01H31/12 ,  H02M1/00 ,  H02M1/32 ,  H02M5/458 ,  G01R31/34

CPC classification number: H02M1/00 ,  G01R31/343 ,  H02M1/32 ,  H02M5/4585 ,  H02P2201/03

Abstract: A motor driving device includes, a PWM converter that performs power conversion between AC power and DC power in a DC link, an inverter that converts the DC power in the DC link to AC power for a motor and that converts the AC power from the motor to DC power for returning to the DC link, a power storage unit that stores the DC power, a switch that connects or disconnects between an AC power supply and the PWM converter in response to a command, and a command unit that continues outputting a connection command to the switch while a DC voltage in the DC link is boosted up to a prescribed voltage by the DC power, and that initiates outputting a disconnection command to the switch after the DC voltage in the DC link reaches the prescribed voltage and before the inverter initiates powering operation.

公开(公告)号：US20180062557A1

公开(公告)日：2018-03-01

申请号：US15248544

申请日：2016-08-26

Applicant: Eaton Corporation

Inventor： Tony Tao ,  Xiaoling Li ,  Huaqiang Li

IPC: H02P29/024 ,  H02P27/08 ,  H02K17/30

CPC classification number: H02P29/024 ,  H02H1/00 ,  H02K17/30 ,  H02M1/00 ,  H02M1/32 ,  H02M5/458 ,  H02M2001/007 ,  H02M2001/322 ,  H02P3/22 ,  H02P27/08 ,  H02P2201/03

Abstract: An adjustable speed drive (ASD) circuit includes a rectifier bridge to convert an AC power input to a DC power, a DC link coupled to the rectifier bridge to receive the DC power, a DC link capacitor bank comprising at least first and second capacitors connected to the DC link, each capacitor having a capacitor voltage thereacross, and a protection circuit including a detection circuit configured to detect a short circuit on one or more of the first and second capacitors of the DC link capacitor bank and generate an action signal upon detection of a short circuit on one or more of the first and second capacitors of the DC link capacitor bank. The ASD circuit also includes an action circuit in operable communication with the detection circuit and configured to cause a short circuit across the DC link upon receiving the action signal from the detection circuit.