| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a torque control apparatus for induction motors that realize accurate torque control by correcting secondary resistance. <P>SOLUTION: The torque controller is configured to separate the primary current of an induction motor 4 into a flux component, linked to a secondary conductor and a torque component orthogonal thereto, and control torque in accordance with a torque command value. The torque control apparatus includes torque effective value computing means 101 for computing the effective value of a torque command value from a torque standard; thermal constant setting means 102 for setting the heat loss coefficient of the motor; temperature computing means 103 for computing a secondary conductor temperature, under heat equilibrium condition from the heat loss coefficient, the effective value of torque, and the ambient temperature; primary lag computing means 104 for computing a transient temperature in thermal transpiration from the computed secondary conductor temperature under thermal equilibrium condition; and resistance value computing means 105 for computing the resistance value of the secondary conductor from the transient temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT |
