| 摘要 |
PURPOSE:To obtain a current vector phase irrespective of the amplitude of a current by substituting for a current vector phase command value when a motor phase current is small so that a bit pattern cannot be formed. CONSTITUTION:A memory for storing the relationship between a bit pattern and a current vector phase corresponding to the pattern in a table format is preset in a processor 4, thereby obtaining its current vector phase epsilon from the bit pattern detected through a comparator 1. On the other hand, when the motor phase current is excessively small so that the bit pattern cannot be formed, it is substituted for the current vector phase command value provided in an inverter controller, thereby presuming to decide it even if the current vector phase cannot be immediately detected from the phase current. |
