Series ZYZJ DC motors, developed on the basis of Series Z4 DC motors, are a kind of serial products for special purpose, which have been made corresponding improvements in designing and manufacturing technologies in accordance with characteristics of the roll drives of sugarcane mills. Adopting multi-angular frame,the motors feature full utilization of stator space and good compactness of internal structure. Besides, CAD is used for controlling electrical parameters in a proper way, the motors are therefore characterized by smaller volume, lighter weight, lower moment of inertia, etc.
The motors employ painted lamination yoke structure and other effective measures for magnetic ciruits, capable of enduring both current ripple and rapid current changes, and improving commutative dynamic characteristic. The motors can be lastingly operated from three-phase bridge without a smoothing reactor. With noval construction of class F insulation,the motors ensure stable dielectric performance and excellent heat dissipation.By means of special insulation treatments,the motors possess fairly good moistureproof capability and mechanical strength, able to be used in tropical and humid region. As stators are added with compensating windings for whole series, the motors boast stronger overload capacities. The overload capacity at base speed is 2.5 times of rated torque and at high speed 1.8 times of rated current, lasting 1 minute. Outline and mounting dimensions of the motors comply with international IEC 72 standard, except for the axial distance between the mounting holes(dimension B).