| 摘要 |
PURPOSE:To enable precise torque control by inputting four types of detection signals representing the operating states of a motor to a computer and generating a signal of torque data stored in advance in a memory by a retrieval signal. CONSTITUTION:When an induction motor 2 is operared by a VVVF inverter 1, four types of detection signals such as a current I1 from a detector 4, frequencies fi from detectors 4, 5, a voltage VM, a frequency from a speed detector 3 and a slip S obtained from the frequency fi are applied to the address retrieving unit 8a of a computer 8. The analyzed torque is stored in advance in a memory 8b, which is retrieved to obtain torque data obtained from the input, thereby generating the torque signal. Accordingly, analyzing function is not provided in the component, thereby simplifying it, and the error due to the temperature change of a secondary resistor can be remove, thereby controlling precisely the torque. |
