Zhufeng ACI Frequency Converter Application in Mine Hoist

Energy saving rate: 15% ~ 30%

The existing problems of most of companies:

1.    The traditional inclined shaft hoist commonly used AC winding motor series resistance speed control system. Resistor switches with the relay - AC contactor control. This control system due to the speed of AC contactor in the process of frequent action, the equipment runs for a long time. AC contactor main contact easily oxidized, triggering equipment failure.

2.    The traditional inclined shaft hoist in the deceleration and crawling phase of the speed control performance is poor. Often resulting in inaccurate parking location. Hoisting machine frequent start ©p speed and braking, the external resistance of the circuit in the rotor on a considerable power consumption.

3.    The traditional inclined shaft hoist using AC winding motor series resistance speed. This kind of speed governing system belongs to the step speed regulation, the smoothness of speed regulation is bad; low speed mechanical characteristic is softer, the static slip rate is bigger; The power consumption of the slip is large, energy saving is poor; Starting process and speed shift The impact of large current in the process; high-speed operation of vibration, security is poor.

Inverter energy-saving transformation principle:

In order to overcome the shortcomings of the conventional AC winding motor series resistance speed control system. Using frequency conversion technology to improve the elevator, can achieve the full frequency (0 ~ 50Hz) within the constant torque control. The treatment of renewable energy can be used in low-cost energy-saving braking scheme or energy-saving more significant feedback braking scheme. For safety considerations, the hydraulic mechanical brake needs to be retained and the hydraulic mechanical brake and frequency converter braking integrated during the design process.

Advantages:

1.    Saving energy

Frequency control, is a non-energy-efficient and efficient way. Lifter most of the time in the electric state, energy saving is very significant. Energy saving more than 30%, and achieves good economic benefits.

2.    Security greatly improved

Hoist frequency control, the stability of the system is running high, so the whole production operations in the security risks greatly reduced and improved security.

3.    Reduce costs

After the adoption of inverter technology transformation, in the whole system to reduce the operation failure and downtime, saving manpower and material resources, improve coal transport capacity, indirect economic benefits are also very impressive.