Below is a list of 3 Phase Motor manufacturers from Chesterfield, Missouri. 3 phase motors are a type of electric motor that operates based upon a three-phase electrical load, which is a common form of electric power transmission. 3 phase motors are often both more compact and less expensive than single-phase electric motors. Also offering higher efficiency as well as inherently higher starting torque than single phase motors, three-phase motors are an incredibly popular type of electrical motor.