What is the difference between electric hoist CD and MD?

The following will analyze the differences between CD electric hoists and MD electric hoists from five aspects.

• 1. Velocidad de carrera:

  • CD type electric hoist: It is a single-speed polipasto eléctrico. It only operates at one speed (usually the regular raise/lower speed).

  • MD type electric hoist: It is a two-speed electric hoist. It offers two operating speeds:

    • Normal speed (main speed): The same normal lifting/lowering speed as CD type, used for general handling.

    • Slow speed (micro speed): A slower, more precise lifting/lowering speed, used when precise positioning, fine operation or close to the load is required.

• 2. Working mode/operation:

  • CD type: The operation is relatively simple, usually only one lifting/lowering gear (single speed).

  • MD type: More flexible operation. By operating the handle or button, the operator can switch between normal speed and slow speed to adapt to different operating needs.

• 3. Internal structure (motor):

  • Type CD: Usually uses a single-speed conical rotor brake motor.

  • MD type: Usually a double-winding (o dos velocidades) conical rotor brake motor is used, or the two-speed function is achieved through a mechanical transmission mechanism (such as a planetary gear reducer). There are two independent sets of coils inside the double-winding motor, corresponding to normal speed and slow speed respectively.

• 4. Escenarios de aplicación:

  • Type CD: Suitable for general hoisting, loading and unloading operations that do not require high positioning accuracy, relatively stable loads, and do not require precise operations. Por ejemplo: loading and unloading goods in the warehouse, simple lifting of equipment in the workshop, etc.. The price/performance ratio is usually better.

  • MD type: Suitable for occasions that require precise positioning, fine adjustment, safe access to the load or the operation of precise, fragile, and valuable items. Por ejemplo:

    • Installation and positioning of machine tool workpieces.

    • Mold clamping and alignment.

    • Precision adjustment during equipment maintenance.

    • Install glass, precision instruments and other fragile items.

    • In situations where space is limited or smooth start/stop is required. Stronger functions and wider applicability.

• 5. Price:

  • Since the MD type has a more complex structure (two-speed motor or variable speed mechanism) and more functions, its price is usually higher than that of the CD-type electric hoist of the same specification.

The difference between CD and MD electric hoists

Característica	CD type electric hoist	MD electric hoist
Speed	Velocidad única (normal speed only)	Velocidad dual (normal speed + slow/micro speed)
Modo de funcionamiento	Simple (single speed operation)	Flexible (can switch between normal speed and slow speed)
Core motor	Single speed conical rotor brake motor	Double-winding conical rotor brake motor or single-speed motor + mechanical transmission mechanism
Main advantages	Simple structure, low price, relatively easy to maintain	Posicionamiento preciso, fine operation, higher safety (slow approach)
Typical applications	General lifting, loading and unloading, and occasions where precision is not required	Precision installation, mold clamping, mantenimiento del equipo, fragile product lifting, narrow space operations
Price	Lower	Higher

Nota:

If you only need basic lifting and lowering functions, do not have high requirements for positioning accuracy, and are pursuing economy, choose the CD type.

If you often need to perform precise positioning, fine-tuning, or operate delicate and fragile items, and need a safer slow-speed approach function, then the MD type is a more suitable choice, although the price will be higher.

When choosing, be sure to make a decision based on your specific working conditions, accuracy requirements, budget, and needs for operational safety and precision.