The travel motor drive transmission system finally provides driving torque to the wheels of the electric pallet stacking forklift. The motor that drives the travel mechanism on the electric stacker forklift is called a traction motor, and a DC series motor is often used. This is because the series motor has soft mechanical characteristics, which can adapt to the operation requirements of the electric stacker, and is more economical. The excitation winding of this motor is connected in series with the armature winding. When the armature current increases, the magnetic flux of the magnetic pole also increases. The torque of the motor is not only increased due to the increase of the motor armature current, but also due to the increase of the magnetic flux. In the case that the magnetic pole flux is not saturated, the torque of the motor is almost proportional to the square of the armature current. Therefore, a larger torque can be obtained with a smaller armature current. This is also beneficial for reducing the discharge current of the battery and making full use of the capacity of the battery. The advantages of DC series motor for electric stacker traction are: it can be started with load, and the transmission system does not need a clutch; it can be forward and reversed without reverse gear, and it has the tendency to automatically adapt to the change of resistance; the torque change multiple is greater than the current change multiple , it is beneficial to protect the battery and prolong its service life; compared with the hydraulic transmission, the high-efficiency area is wide at different speeds.
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