The ZFQZ series DC motors are a product line developed based on the Z4 series DC motors, incorporating the main technology of the ZZJ-800 series DC motors. The rotational inertia of the motors is 45% and 65% respectively for the ZZJ-800 and ZZJ-900 series. They are suitable for harsh conditions with frequent forward and reverse operations, as well as frequent starting and stopping. The motors feature excellent overload characteristics. Their torque and starting torque are 112% and 117% respectively compared to the ZZJ-800 and ZZJ-900 series, while weighing only 65% of the ZZJ-800 series.