초록 ▼

A start-up control technique is disclosed for an AC motor. At least one H-switch connects a motor winding to a pair of AC-supplied power lines and is switched between designated states to yield a fundamental frequency component voltage waveform in the winding phase shifted from the voltage waveform

A start-up control technique is disclosed for an AC motor. At least one H-switch connects a motor winding to a pair of AC-supplied power lines and is switched between designated states to yield a fundamental frequency component voltage waveform in the winding phase shifted from the voltage waveform in another winding. A rotating field is provided for start-up, without energy-storage phasing capacitors or inductors.

대표청구항 ▼

A start-up control method for an AC motor control circuit having a first winding W1 connected to a pair of power lines L1 and L2 supplied by an AC source, and having a second motor winding W2 connected by an H-switch to L1 and L2, said H-switch having one ON state connecting L1 to the left end of W2

A start-up control method for an AC motor control circuit having a first winding W1 connected to a pair of power lines L1 and L2 supplied by an AC source, and having a second motor winding W2 connected by an H-switch to L1 and L2, said H-switch having one ON state connecting L1 to the left end of W2 and connecting L2 to the right end of W2, said H-switch having another ON state connecting L2 to the left end of W2 and connecting L1 to said right end of W2, said start-up control method comprising switching said H-switch between said one and said other ON states, without energy-storage phasing capacitors or inductors, to yield a fundamental frequency component voltage waveform in W2 phase shifted from the voltage waveform in W1, and comprising switching said H-switch to said other ON state at a zero crossing of the AC signal from said source, then switching said H-switch to said one ON state after a given delay and before the first successive next zero crossing of said AC signal, then switching said H-switch to said other ON state at said first successive zero crossing of said AC signal, then switching said H-switch to said one ON state after said given delay, then switching said H-switch to said other ON state at the second successive zero crossing of said AC signal, then switching said H-switch to said one ON state after said given delay, then switching said H-switch to said other ON state at the third successive zero crossing of said AC signal, and so on.