Regarding the speed adjustment of the electric hoist, many people think that using the frequency converter is the best method, but some electric hoists are not suitable for using the frequency converter. Here are some practical electric hoist speed control methods to save you time, and create more production value.
Method 1. Motor rotor resistance speed regulation has the advantages of simple structure, low price and general quality.
The disadvantage is that the speed changes are relatively large and unstable.
Method 2: Adjusting the speed through the hydraulic push rod, can obtain a relatively stable speed, but the speed is low, the middle speed is soft, and the electric hoist mechanical parts must be partially modified during use.
Method 3: Speed adjusting by dynamic braking, the character is that the speed gear can be adjusted, and the energy saving is high, and the use is safe and reliable.
The disadvantage is that the low speed can not be good controlled.
Method 4: Through frequency conversion to adjust the speed, this is an ideal frequency conversion speed regulation method, which can realize stepless speed regulation, and also has high control precision, is easy to use and maintain, and can also be operated remotely.
However, it should be noted that the electric hoist of the conical motor is generally not suitable for this, because all the inverters need acceleration time to start up, and the voltage is slowly rising during acceleration, and the cone rotor can not be displaced and released. It is easy to cause inverter overload protection.
Method 5: The thyristor stator voltage adjustment and speed adjustment, the speed regulation ratio reaches 1:10, the speed change rate is small, and both the rise and the fall can be adjusted, which has certain development prospects; the shortcomings are complicated in structure and difficult to use.
Wire rope electric hoist
