Tsawg voltage DOL (direct-pib) ultra npaum peb-theem mus tas li hlau nplaum synchronous lub cev muaj zog rau zaj duab xis tshuab tshuab hauv kev lag luam yas

Piv rau asynchronous motors, qhov nruab nrab lub zog txuag tus nqi yog 14.27%