three-hinged
three-indication
three-input
three-jawed
three-lane
three-layer
three-lens
three-level
three-neck
three-pass
  three-phase
three-plate
three-play
three-point
three-pointer
three-product
three-quarter
three-quarter-wave
three-resonator
three-roller
three-section

    three-phase motor

     трехфазный двигатель

     трехфазный электродвигатель