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Use of Synchronous Modulation to Recover Energy Gained 
From Matching Long Cable in Inverter-Fed Motor Drives 
Abstract: 
As inverter-fed motor drives generate fast- voltage pulses, the 
transmission-line effects on long motor cable and motor stator windings lead to 
overvoltage on the cable and motor terminals, as well as inside motor stator 
windings, and also an increase in the common-mode current. Such phenomenon 
would cause premature failure of the motor and cable insulation. A general 
protective measure is the use of a passive filter, such as RC and RLC filter, to 
reduce the voltage surges by matching the cable impedance and/or altering the rise 
time of the voltage pulses. However, passive filter are bulky and lossy. This paper 
presents an active motor terminal filter with an energy recovery function that can 
achieve the same functions as the passive filter, but consumes much less power. 
The proposed filter recovers energy gained from suppressing motor terminal 
voltage surges and regenerating the recovered energy back to the whole system. An 
experimental filter has been built and evaluated on a 1-HP three-phase motor drive 
system. A comparative study into the performance among commonly used RC 
filter and RLC filter and the proposed filter will be given.
Block diagram: 
DC SUPPLY 
TOOLS AND SOFTWARE USED: 
 MP LAB 
 ORCAD/PSPICE 
 MATLAB/SIMULINK 
OUTPUT: 
 HARDWARE 
 SIMULATION 
ELECTRIC 
MOTOR 
ENERY RECOVERY 
MODULE 
FILTER CIRCUIT 
DRIVE CIRCUIT 
MICROCONTROLLER

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JPEEE1456 Use of Synchronous Modulation to Recover Energy Gained From Matching Long Cable in Inverter-Fed Motor Drives

  • 1. Use of Synchronous Modulation to Recover Energy Gained From Matching Long Cable in Inverter-Fed Motor Drives Abstract: As inverter-fed motor drives generate fast- voltage pulses, the transmission-line effects on long motor cable and motor stator windings lead to overvoltage on the cable and motor terminals, as well as inside motor stator windings, and also an increase in the common-mode current. Such phenomenon would cause premature failure of the motor and cable insulation. A general protective measure is the use of a passive filter, such as RC and RLC filter, to reduce the voltage surges by matching the cable impedance and/or altering the rise time of the voltage pulses. However, passive filter are bulky and lossy. This paper presents an active motor terminal filter with an energy recovery function that can achieve the same functions as the passive filter, but consumes much less power. The proposed filter recovers energy gained from suppressing motor terminal voltage surges and regenerating the recovered energy back to the whole system. An experimental filter has been built and evaluated on a 1-HP three-phase motor drive system. A comparative study into the performance among commonly used RC filter and RLC filter and the proposed filter will be given.
  • 2. Block diagram: DC SUPPLY TOOLS AND SOFTWARE USED:  MP LAB  ORCAD/PSPICE  MATLAB/SIMULINK OUTPUT:  HARDWARE  SIMULATION ELECTRIC MOTOR ENERY RECOVERY MODULE FILTER CIRCUIT DRIVE CIRCUIT MICROCONTROLLER