| 摘要 |
PURPOSE:To make uniform the angular speed over a single rotational period of the common rotary shaft of a motor compressor through a simple constitution by a constitution wherein a position detecting means detects angular rotational position of the common shaft at two points and produces two detection pulses during single rotational period thus producing an electromagnetic torque similar to the compression torque of a compressor based on these two detection pulses. CONSTITUTION:At first, an electromagnetic sensor 18 detects pulses P1, P2 which are fed through a speed detector 25 to a speed controller 27. A difference from 225 deg. time point crank angle is then detected with respect to the detected pulse P2 and an amplitude correction signal S1 for torque pulsation is produced based on thus detected difference. The amplitude correction signal S1 is fed to a phase shifter 28 where the phase is advanced and then it is fed, as an amplitude information signal, to a multiplier where it is multiplied by a pulsation command signal SC to produce a pulsation pattern correction signal S2. The pulsation pattern correction signal S2 is then fed, based on information fed from the speed detector 25, to a controller 23 and subjected to V/F modulation. Consequently, an applying electromagnetic torque pattern similar to an actual compression torque pattern is obtained. |
