Knowing Features of China Crane Motors Can Help Your Selection

China’s crane specifically used in DC and AC motors. The main advantage of the DC motor is speed range, strong overload capacity, smooth characteristics and larger starting, braking torque. Working voltage is 220 v and 440 v. 

But there are several problems in crane motor such as a high cost of equipment, bulky and requiring a dedicated power supply, and other shortcomings. Minority metallurgical crane and which requirements smooth speed transmission mechanism in a wide range use the DC motor. AC motor, its main advantage is simple structure and convenient power supply. 

Generally we use three-phase AC induction motor and conical rotor motor as the crane motor, the working voltage of 220 v/380 v and 500V. The three-phase AC induction motor is divided into JzR2, JZ2, Yz, YZR, ~ ZR2 and YZ aeries JZ2. Wound rotor induction motor was used the most frequently. Because this motor rotor can be circumscribed starting resistance to speed governing, smooth starting, starting current is usually no more than 2-2.5 times beyond the rated current, with high overload capacity. General crane machinery, especially its hoisting mechanism, commonly used in this motor. The advantages of Cage induction motor is simple structure, manipulating structure mostly use wound rotor induction motor, or disc brake motor.

The crane motor selection of the hoisting mechanism

Lifting machinery is the main and the most basic institutions. The motor is characterized by: Crane lifting the inertial load is small, the acceleration torque required is very small, only need the running torque of 10% to 20% full stabilize, while the average starting torque of the motor is usually rated torque 1.6 to 1.8 times, so the start time is short. 

Crane Motor is intermittent periodic duty - s3 working operation. In lifting machinery design, the motor choice is an important content, choice of motor refers to the motor insulation class, rated power, rated voltage, rated speed, type and type, protection class, the working system, the governor, electrical connection sustained rate of project selection, one of the most important is motor insulation class, work systems, protection class selection and motor power.

The insulation grade motor is running, the loss of heat is generated will elevate temperature of the motor. The motor allowed the maximum temperature is determined by the degree of heat insulating material used by the motor. The degree of heat insulating material is known as insulation class. Different insulating material, the maximum ambient temperature is added ℃ calculated. 

At present, China's production of motor E-Class and B-grade insulation, the development trend is the use of the class F and H allow the temperature is different, the motor insulation material is divided into 5 Grade insulation, so you can reduce the levels of motor output power, maximum allowable temperature rise ring Weight, reduce the volume of the motor.