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Application of PSG energy feedback device in mine hoist
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Application of PSG energy feedback device in mine hoist

Application of PSG energy feedback device in mine hoist

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Most of the coal mine hoists use a resistor in the stator coil of the motor to achieve the effect of speed regulation. During operation, part of the energy is released to the resistor by releasing electrical energy, thereby reducing the speed of the motor, which is bound to cause some electrical energy. Loss and waste. In addition, the resistance heating increases the indoor temperature. As the motor runs for a long time, the motor shell becomes severely heated and needs to be shut down for cooling, which greatly reduces the life of the motor and also affects the production efficiency. The society is progressing and technology is developing. This confusion has aroused the attention of equipment users. The installation of energy feedback has been widely used. Of course, energy feedback should replace the backward control method of resistance heating.

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Several goals can be achieved with energy feedback:

1. Stronger braking ability

Due to the PSG energy feedback braking method, the braking ability of the equipment is enhanced, the braking effect is more obvious and reliable, and the operation is safer.

2. Utilization of regenerative electric energy

The installation of PSG energy feedback has a better energy-saving effect. The electric energy originally consumed on the braking resistor has been fully recovered and utilized. When the equipment is in the downward running state, the generated regenerative electric energy is returned to the grid. According to the law of conservation of energy, the frequency converter is During braking, the motor speed decreases with frequency when the load is down. At this time, the energy (potential energy) generated by braking is fed back to the same-level grid of the inverter through the installation of a PSG energy feedback device for reuse. In addition, when the hoist brakes and stops, the electric energy generated by the inertia of the motor can also be turned into a renewable energy source. Using PSG energy feedback device can save more than 25% of electricity.

3. Power saving calculation method

Calculate the amount of electricity saved in a year and the amount of electricity saved according to the operating status of the coal mine hoist motor of a certain unit. Motor power: 155KW, rated current: 300A, using the energy feedback PSG-04-160H to run for 12 hours a day, the annual electricity consumption is 155KW×12 (hours) × 360 (days) = 669600 (degrees), which can save electricity by 25 % Calculation: 669600 degrees) × 25% = 167400 (degrees) of electricity saving amount: 167400 × 0.75 yuan = 125550 yuan per kilowatt-hour of electricity at 0.75 yuan.

4, the rate of return on investment

The price of an energy feedback device is estimated at 40,000 yuan, and the 155KW motor saves 167,400 kWh per year. The electricity bill is calculated at 0.75 (more than 0.75 yuan/kWh in first-tier cities). Even if we recover the cost in half a year, we can see the benefits of installing a PSG energy feedback device: it can recover the investment cost and extend the life of the equipment. Improve the stability of the system. Do you still hesitate? Still waiting? Time flies, install PSG energy feedback device early and benefit early!

Remarks (PSG application description):

1. PSG is suitable for centrifuges, lathes, textile machines, printing machines, sugar mills, industrial dehydrators, packaging machines, kowtow machines, pumping units, rewinders, paper machines, spindles, planers, cranes, Hoists, elevators, tower cranes, winches, cable cars, port cranes, wire drawing machines, coal mining machines, down belt conveyors, ship unloaders, hoists, rolling mills, cranes, cranes, cranes, uncoiling and winding, wire drawing machines, Where the frequency conversion speed regulation or servo control of wire drawing machines, monkey cars, stackers, decoilers, coilers, cable cars, ship unloaders and other equipment generates regenerative energy feedback;

2. PSG is not suitable for elevator energy feedback occasions;

3. PSG adapted motor power is 2.2KW~90KW, which can be subdivided into standard type, heavy-duty type and continuous feedback type;

4. PSG 45~90KW energy feedback device supports multiple parallel use.

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