10 the system 10 includes an electrical motor 12 which supplies energy to a winch or drum 11 to which is attached to or spooled upon for example a wireline logging cable 13 not shown as will be appreciated by those skilled in the art the electric motor 12 receives electric power from a power supply 14 for example an alternating current ac power supply through a variable speed drive 16 the cable 13 is spooled on and or unspooled from the drum into a wellbore not shown due to gravity drill pipe action or the like in accordance with a wellbore operation sequence the wellbore operation may comprise for example a logging operation performed an operation with a wireline tool 15 or the like after having unspooled a specific length of cable 13 during the wellbore operation the electrical motor 12 becomes an electrical generator as will be appreciated by those skilled in the art during this phase the electrical motor generator 12 needs to be controlled indeed in order to have a counter torque on the drum to maintain the load which may include the weight of the cable 13 the weight of the tool 15 to tool string and extra.