CONTROL APPARATUS FOR ELECTRIC ROTATING MACHINE

摘要

Upon determining that the absolute value of an electrical angular speed of a motor-generator is smaller than or equal to a threshold value, a control apparatus compensates a current detected by a U-phase current sensor based on a temperature detected by a U-phase temperature sensor and compensates a current detected by a V-phase current sensor based on an estimated temperature of a V-phase current sensor. On the other hand, upon determining that the absolute value of the electrical angular speed is larger than the threshold value, the control apparatus compensates the currents detected by the U-phase and V-phase current sensors based on temperature detected by the U-phase temperature sensor.

主权项

1. A control apparatus for use in a control system which includes a power conversion circuit for applying an AC voltage to a three-phase electric rotating machine in accordance with power supplied, current detection sections provided corresponding to at least two of three phases of the electric rotating machine to detect phase currents of the electric rotating machine, and a temperature detection section provided corresponding to at least one of the current detection sections for detecting temperature of the current detection section,
a subject current detection section being one of all the current detection sections, temperature of the subject current detection section being detected by a subject temperature detection section which is one of all the temperature detection sections, a non-subject current detection section being one of all the current detection sections other than the subject current detection section, the control apparatus comprising: a temperature increase amount estimation section that estimates, for each of all the current detection sections, an amount of temperature increase of the current detection sections due to a current flowing through the phase in which the current detection section is provided based on a current flowing through the current detection section; a reference temperature calculation section that calculates a reference temperature by subtracting the temperature increase amount of the subject current detection section from a temperature detection value of the temperature detection section; a temperature estimation section that estimates temperature of the non-subject current detection section by adding the reference temperature to the temperature increase amount of the non-subject current detection section; a speed determination section that determines whether a rotational speed of the electric rotating machine is in a high speed region higher than a threshold speed or in a low speed region lower than or equal to the threshold speed; a low speed rotation compensation section that compensates a current detection value of the subject current detection section based on the temperature detection value of the temperature detection section, and compensates the current detection value of the non-subject current detection section based on the temperature of the non-subject current detection section estimated by the temperature estimation section on condition that the rotational speed is determined to be in the low speed region by the speed determination section; a high speed rotation compensation section that compensates a current detection value of each of all the current detection sections based on the temperature detection value of each temperature detection section without using the temperature of the non-subject current detection section estimated by the temperature estimation section on condition that the rotational speed is determined to be in the high speed region by the speed determination section; and a control section that controls a controlled variable of the electric rotating machine by manipulating supply of power to the power conversion circuit using the compensated current detection value of each current detection section.