| 摘要 |
<p>PURPOSE:To easily and surely measure motor parameters automatically by applying a DC voltage from an inverter of a driving power source, detecting the transient current for the DC voltage at a standstill, and finding the secondary resistance and the secondary inductance of an induction motor based on a definite equation. CONSTITUTION:Making on and off the transistors Tr1, Tr6, etc. in an inverter 21 of a driving power source, and setting a prescribed voltage to a PWM waveform generating circuit 22 through a control circuit 11, a pulse-shaped DC voltage is impressed across windings U, W of an induction motor 1. At a standstill of the motor, from the ratio between the initial current detected by a current detector 13 and the following transient falling currents i1(t1), i1(t2), the falling time constant T is determined by the circuit 11, and based on the equation I, the secondary resistance r2 and the secondary inductance L2 as the parameters of the motor are found. Thus, parameters of an induction motor can be determined by an automatic measurement easily and surely at a standstill of the motor.</p> |
