公开(公告)号：US11171580B2

公开(公告)日：2021-11-09

申请号：US15538455

申请日：2015-12-22

申请人： GENERAL MAGNETIC INTERNATIONAL INC.

发明人： Al Duerr ,  Aaron Brassard ,  John Doyle ,  Wray Sparling

IPC分类号： H02P3/22 ,  H02H5/04 ,  H02H7/20 ,  H02P3/02 ,  H02H3/08 ,  H02P27/04 ,  F04C2/107 ,  F04C14/28 ,  F04C15/00

摘要： The invention relates to fluid drive systems used in fluid wells and brake systems for permanent magnet wellhead direct drives. The braking controller connects or disconnects a brake resistor from a back EMF. A variable frequency drive (VFD) drives the motor and communicates with the control circuitry of the brake controller. The control circuitry monitors the brake resistor and depending on the rotational speed and direction of the motor and operating state of the VFD, disconnects or connects the brake resistor. If the direction of the motor is in reverse and above a threshold speed, it connects the brake resistor. If the direction of the motor is in reverse and below the threshold speed, the control circuitry dissipates stored back EMF through the brake controller. The amount of stored back EMF corresponds to the time to empty a pump.

公开(公告)号：US20170373613A1

公开(公告)日：2017-12-28

申请号：US15538455

申请日：2015-12-22

申请人： GENERAL MAGNETIC INTERNATIONAL INC.

发明人： Al Duerr ,  Aaron Brassard ,  John Doyle ,  Wray Sparling

IPC分类号： H02P3/22 ,  H02P3/02 ,  H02H7/20 ,  H02H3/08 ,  H02P27/04 ,  H02H5/04 ,  F04C2/107 ,  F04C15/00 ,  F04C14/28

CPC分类号： H02P3/22 ,  F04C2/107 ,  F04C14/28 ,  F04C15/008 ,  H02H3/083 ,  H02H5/043 ,  H02H7/20 ,  H02P3/02 ,  H02P27/045

摘要： The invention relates to fluid drive systems used in fluid wells and brake systems for permanent magnet wellhead direct drives. The braking controller connects or disconnects a brake resistor from a back EMF. A variable frequency drive (VFD) drives the motor and communicates with the control circuitry of the brake controller. The control circuitry monitors the brake resistor and depending on the rotational speed and direction of the motor and operating state of the VFD, disconnects or connects the brake resistor. If the direction of the motor is in reverse and above a threshold speed, it connects the brake resistor. If the direction of the motor is in reverse and below the threshold speed, the control circuitry dissipates stored back EMF through the brake controller. The amount of stored back EMF corresponds to the time to empty a pump.