Patent ID: 9698714
Date: 2017-07-04
CPC Classifications: E21B,H02K,H02P,Y10T

Claim:
1. A method comprising: detecting an asynchronous operation of a permanent magnet motor, having a rotor and a stator, within a downhole tool, wherein the downhole tool has experienced a failure of the rotor's ability to rotate resulting in the asynchronous operation, the asynchronous operation occurring when rotor and stator magnetic fields of the permanent magnet motor rotate at different speeds; interrupting the asynchronous motor operation for the permanent magnet motor, wherein the motor operation is associated with at least a drive frequency and a drive amplitude of the permanent magnet motor; and creating controlled cyclic variations in the permanent magnet motor output using controlled asynchronous operation of the permanent magnet motor, wherein the controlled cyclic variations are applied until the rotor's ability to rotate is restored.