Most coal mine hoists use a series resistor on the stator coil of the motor to achieve speed regulation By releasing electrical energy during operation, a portion of the energy is released onto the resistor, thereby reducing the speed of the motor, which inevitably leads to the loss and waste of some electrical energy Moreover, the resistance heating causes an increase in indoor temperature. As the motor runs for a long time, the motor casing heats up severely and needs to be shut down for cooling, greatly reducing the lifespan of the motor and also affecting production efficiency. Society is advancing, technology is developing, and this confusion has attracted the attention of device users. Installing energy feedback has become widely used, and energy feedback should naturally replace the outdated control method of resistance heating.
Several goals that can be achieved through energy feedback:
1、 Stronger braking ability
Due to the use of PSG energy feedback braking method, the braking capacity of the equipment has been enhanced, resulting in more obvious and reliable braking effect, and safer operation.
2、 Renewable energy utilization
Installing PSG energy feedback has a better energy-saving effect. The electrical energy originally consumed on the braking resistor is fully recovered and utilized. When the equipment is in a downward operating state, the regenerated electrical energy generated returns to the grid According to the law of conservation of energy, during braking of a frequency converter, the motor speed decreases with frequency due to the downward load. At this time, the energy (potential energy) generated by braking is fed back to the same level power grid of the frequency converter through the installation of a PSG energy feedback device for reuse. When the elevator brakes and stops, the electrical energy generated by the inertia of the motor can also be converted into renewable energy. The use of PSG energy feedback device can save more than 25% electricity.
3、 Energy saving calculation method
Calculate the annual energy-saving degree and amount based on the operating condition of the coal mine hoist motor of a certain unit. Motor power: 155KW, rated current: 300A, using powered PSG-04-160H energy feedback to operate for 12 hours a day, the annual electricity consumption is 155KW × 12 (hours) × 360 (days)=669600 (degrees). Calculated based on a 25% energy-saving rate: 669600 degrees) × 25%=167400 (degrees). Energy saving amount: calculated at 0.75 yuan per kilowatt hour, 167400 × 0.75 yuan=125550 yuan.
4、 Return on investment
The estimated price of an energy feedback device is 40000 yuan. A 155KW motor can save 167400 kWh per year, and if the electricity cost is calculated at 0.75 yuan (higher than 0.75 yuan/kWh in first tier cities), it can save 125550 yuan per year. 40000 ÷ 125550 ≈ 0.4 years to recover costs. Even if we recover the cost within six months, the benefits of installing PSG energy feedback devices can be seen: it can recover investment costs and extend equipment life. Improve the stability of the system. Do you still want to hesitate? Do you still need to wait? Time flies, installing PSG energy feedback device early will benefit you!
Remarks (PSG application instructions):
PSG is suitable for frequency conversion speed regulation or servo control of equipment such as centrifuges, lathes, textile machines, printing machines, sugar mill honey separators, industrial dewatering machines, packaging machines, kowtowing machines, oil pumping machines, rewinding machines, paper machines, spindles, gantry planers, cranes, hoists, tower cranes, winches, cable cars, port gantry cranes, wire drawing machines, coal mining machines, downward belt conveyors, ship unloaders, winches, steel rolling machines, cranes, overhead cranes, uncoiling and coiling machines, wire drawing machines, wire drawing machines, monkey carts, stackers, uncoiling machines, coiling machines, cable cars, ship unloaders, etc., to generate regenerative energy feedback;
2. PSG is not suitable for elevator energy feedback applications;
3. PSG is compatible with motors with a power range of 2.2KW to 90KW, which can be divided into standard, heavy-duty, and continuous feedback types;
4. PSG 45-90KW energy feedback device supports multiple parallel connections.
