Variable speed electric hoist

In the field of industrial lifting, the demand for precise positioning, smooth operation, safety and reliability of variable speed electric hoists is increasing day by day. As the world’s leading crane manufacturer, Weihua Group’s variable speed electric hoist series are carefully designed to meet these stringent requirements. They are not just simple lifting tools, but also precision equipment integrating advanced drive technology and intelligent control.

Core advantages of variable speed hoist

The core of Weihua variable speed electric hoist lies in its excellent stepless speed regulation performance:

1. Variable frequency drive technology (core):

   • Using a high-performance frequency converter (VVVF), by changing the power frequency and voltage of the input motor, continuous, smooth and precise control of the motor speed is achieved.

   • The variable-speed electric hoist starts/stops extremely smoothly: It completely eliminates the “sudden pull” phenomenon when starting and the “slipping hook” phenomenon when stopping traditional hoists, effectively protecting the hoisted objects and equipment structure, and improving operation safety.

   • Wide speed range: It can be continuously adjusted within the range of 10%-100% of the rated speed (such as conventional 8m/min or 20m/min) (the specific range depends on the model). For example, during precise alignment, equipment installation or fragile goods handling, the speed can be reduced to a very low speed (such as 0.8m/min) for fine-tuning; while in open areas or light loads, operating efficiency can be improved.

   • Precise positioning: Millimeter-level control capabilities meet the requirements of harsh working conditions such as high-precision assembly and mold closing.

2. Vector control (optional/high-end configuration):

   • In higher-end models, vector control technology may be used. It not only accurately controls the motor speed, but also accurately controls the motor’s output torque.

   • Even when running at extremely low speeds, it can provide ample and stable torque to ensure that heavy objects hover stably without “crawling”.

   • Response to load changes is faster and more precise.

In addition to the core advantage of continuously variable speed, Weihua variable speed electric hoist embodies high quality in all aspects:

• Excellent lifting capacity and reliability:

  • Covering a wide tonnage range (usually from 1 ton to 80 tons or even higher to meet diverse needs).

  • Weihua variable speed electric hoists are made of high-strength alloy steel for key components (wire ropes, hooks, drums, gears). They undergo strict heat treatment and flaw detection to ensure long-term durability.

  • Optimized gear transmission system design, low operating noise, high efficiency and long life.

  • IP54/IP55 protection level, effectively dustproof and waterproof, suitable for various indoor and outdoor environments such as workshops, warehouses, ports, etc.

• Multiple security guarantees:

  • Dual braking system: Standard electric disk brake (quick response, smooth braking) + mechanical backup brake (automatically effective in case of power outage or emergency), double insurance to ensure safety.

  • Overload protection device: Electronic or mechanical overload limiter, which automatically cuts off the power supply when the load exceeds the set value to protect equipment and personnel safety.

  • Limit switch: Precise upper/lower limit switch (mechanical or non-contact) to prevent overshooting or excessive lowering.

  • Emergency stop button: The operating handle or control box is equipped with an emergency stop switch.

  • Phase loss/wrong phase protection: Prevent equipment damage caused by abnormal power supply.

  • Overheating protection: Monitor the motor temperature to prevent overheating operation.

  • Low voltage protection: Prevent voltage fluctuations from affecting equipment safety.

• Intelligent control and human-computer interaction:

  • Humanized handle/electric hoist with remote control: Ergonomic design, comfortable operation; clear speed gear indication (such as low speed/medium speed/high speed button), intuitive operation.

  • Integrated control box: The frequency converter, protection devices, etc. are integrated into a solid box with reasonable layout and easy maintenance.

  • Status indication and diagnosis: Some models provide operating status indicators or output fault codes through the interface to facilitate quick diagnosis and maintenance.

  • Intelligent options: CAN bus, Profibus, Modbus and other communication interfaces can be provided to easily connect to the factory automation system (PLC/DCS) to achieve remote monitoring, data collection and centralized management.

• High efficiency and energy saving:

  • Frequency conversion technology itself is energy-saving (compared to direct-start motors).

  • Motors usually adopt high-efficiency designs (such as IE3/IE4 levels).

  • Smooth start and stop reduces impact losses.

• Flexible application and low maintenance:

  • Modular design: Easy to install, maintain and replace parts.

  • High working level: usually reaches M5, M6 level, suitable for frequent, medium or heavy load conditions.

  • Convenient maintenance: The design considers maintenance convenience, such as easily accessible refueling points, inspection ports, etc.

Variable speed electric hoist technical parameters

Characteristic	Parameters/Description
Rated lifting capacity	1t, 2t, 3t, 5t, 10t, 16t, 20t, 32t, 50t, 80t…
Lifting speed	Conventional two-speed (e.g. 8/0.8 m/min, 20/5 m/min) Frequency conversion stepless speed regulation (such as 0.8 – 8 m/min, 0.8 – 20 m/min)
Running speed	Normal (e.g. 20 m/min) Frequency conversion stepless speed regulation (such as 2 – 20 m/min)
Job level	M5, M6
Motor	Three-phase asynchronous squirrel cage motor (High efficiency level such as IE3) Frequency conversion special motor
Control method	Variable frequency vector control (VVVF) (optional advanced vector control)
Braking method	Electromagnetic disc brake + mechanical backup brake
Protection level	IP54, IP55 (lifting motor/control box)
Insulation level	Class F or H
International standards	GB, FEM, DIN, ISO, CMAA, AS, etc.
Optional features	Intelligent limit, weighing, anti-sway, remote monitoring, communication interface (CAN, Profibus, Modbus)

Variable speed electric hoist application scenarios

Weihua variable speed electric hoist is widely used in occasions with high requirements on the lifting process due to its characteristics of precision, stability, safety and reliability:

• 1. Precision manufacturing and assembly: automobile production line (engine, gearbox installation), aircraft manufacturing, precision instrument assembly, semiconductor equipment handling.

• 2. Equipment installation and maintenance: Installation, positioning and maintenance of large machine tools, generator sets, and chemical reactors.

• 3. Mold industry: Mold closing, mold opening and handling of large and heavy molds.

• 4. Iron and Steel Metallurgy: Maintenance and spare parts replacement of continuous casting machines and rolling mill equipment.

• 5. Electric power industry: Installation and maintenance of transformers and generator stators/rotors.

• 6. Ports and yards: Loading and unloading of large equipment or special cargo (such as wind turbine blades) that require delicate operations.

• 7. Labs and Clean Rooms: Sensitive equipment or samples that require vibration-free, smooth handling.

• 8. Stage performance: precise lifting and positioning of lighting, sound, and curtains.

Reasons to choose Weihua variable speed electric hoist

• Precise control: Stepless speed regulation meets the most stringent positioning requirements.

• Safe and reliable: Multiple safety protection mechanisms and sturdy and durable design ensure the safety of humans and machines.

• Smooth operation: Completely eliminate start-stop shock and protect goods and equipment.

• High efficiency and energy saving: Frequency conversion technology combined with high-efficiency motor reduces operating costs.

• Widely applicable: Powerful lifting capacity and high working level, adaptable to diverse working conditions.

• Intelligent and advanced: Optional intelligent functions help factory automation upgrades.

• Brand Guarantee: As an industry leader, Weihua provides complete technical support, after-sales service and spare parts supply.

Weihua variable speed electric hoist represents the high technical level of modern industrial lifting equipment. It perfectly combines variable frequency drive technology with the reliability of lifting machinery, providing users with unprecedented precise control capabilities, smooth operation experience and excellent safety guarantee. Whether facing the challenge of precision assembly, handling the handling of heavy equipment, or pursuing higher production efficiency and automation integration, Weihua variable speed electric hoists are a trustworthy high-performance, high-value solution. Choosing Weihua electric hoist means choosing the unremitting pursuit of efficiency, precision and safety.