The same is the fromwinch electric towing winch, the power part (ie motor) there are two, namely, permanent magnet motor and series motor. The former has a fast action, power, suitable for a long time and cost of high volume pull characteristics, while the latter is a small current, classical, simple structure and low cost of traditional forms. The early RAMSEY winch used a permanent magnet motor. Now the vehicle's storage capacity is large, so the current mainstream off-road vehicle winch of high-power electric motors use more series motor. Judge a fromwinch 12500lbs winch with a permanent magnet motor or a series motor, just look at the control box output to the motor part of the number of lines can understand that the two lines are permanent magnet motor and the three lines is the series excitation motor.