| 摘要 |
PURPOSE:To permit measurement of instantaneous torque in a mechanically non-contact manner and over a total speed range by measuring an instantaneous torque from an instantaneous value of primary current and an rotation angle of a rotor. CONSTITUTION:If a three-phase squirrel-cage induction motor 2 is driven by a power source 1, a pulse of frequency proportional to a rotational speed from an incremental type rotary encoder 3 is sent to a counter 4. ROMs 5a, 5b are read out by an output power of the counter 4, which output power becomes an input of multiplying D/A converters 6a-6d The detection output of a primary current instantaneous value from halls CT7a, 7b is also given to these converters 6a-6d. The output power of converters 6a-6d are successively given to operational amplifier 9a, 9b, active filters 10a, 10b, multipliers 11a, 11b and an operational amplifier 12 so that an output power indicating an instantaneous torque will be derived. |
