The application advantages of three-phase asynchronous motors in the mining field are mainly reflected in cost, maintenance, environmental adaptability, reliability, energy saving, etc., especially in line with the needs of “high load, harsh environment, long cycle operation” in mining scenarios. The following are its core advantages and specific manifestations:

Low cost: economical and practical first choice

1.Simple structure and easy to manufacture

The motor does not require permanent magnets or complex commutation devices. It is mainly composed of a stator, a rotor and a housing. The manufacturing process is mature and the cost of raw materials is low (such as silicon steel, copper, cast iron, etc.). The initial purchase cost is 30%~50% lower than that of synchronous motors or DC motors.

It is suitable for a large number of equipment in the mining industry that requires motor drive (such as conveyors, water pumps, etc.), reducing the overall equipment investment cost.

2.Low cost of supporting system

No additional excitation power supply or complex control system (such as the rectifier device of the DC motor) is required, the circuit design is simple, and the installation and debugging cost is low.

Easy maintenance: Reduce downtime losses

1.No vulnerable moving parts

The rotor is a cage structure (cast aluminum or copper bars), without brushes, commutators and other easily worn parts, less mechanical contact during operation, long maintenance cycle (regular maintenance cycle can reach 6~12 months), suitable for mining sites with insufficient maintenance personnel and high downtime costs (such as mine hoist downtime may cause the entire mine to stop production).

2.Simple troubleshooting

Common faults (such as bearing wear and winding short circuit) can be quickly located through conventional detection methods (such as multimeters and vibration detectors). The maintenance technology threshold is low, and most maintenance work can be completed without a professional team.

Strong environmental adaptability: Tolerant to harsh working conditions

1.Explosion-proof and protective design

It can be customized as an explosion-proof motor (such as flameproof type, increased safety type), which complies with explosion-proof standards such as GB 3836, and is suitable for high-gas mines (such as gas extraction pumps, ventilators), avoiding the risk of explosion caused by electric sparks.

The shell has a high protection level (such as IP55, IP65), which can effectively prevent dust and water (underground water spray, tunnel water accumulation scenes), and extend the service life of the motor in humid and dusty environments.

2.Vibration and shock resistance

Rotors with strong structure (such as cast aluminum cage rotors) can withstand high-frequency vibration and impact loads during the operation of mining equipment (such as crushers and rock drills), and are not prone to loose parts or structural damage.

High reliability: ensure continuous production

1.Long-term stable operation

No commutation spark problem, suitable for equipment that runs continuously for 24 hours (such as ventilators, drainage pumps), with an average trouble-free operation time of more than 100,000 hours, reducing the risk of shutdown due to motor failure (interruption of mining operations may cause losses of hundreds of thousands of yuan per day).

2.Strong starting and overload capacity

Although the cage asynchronous motor has a large starting current, its structure can withstand short-term high current shocks; the wound asynchronous motor can increase the starting torque through the rotor series resistance (the starting torque multiple can reach 2~3 times the rated torque), which is suitable for heavy-load starting scenarios (such as ball mills and mine hoists that need to overcome the weight of wire ropes and containers when starting without load).

Great energy-saving potential: Adapt to variable load scenarios

1.Variable frequency speed regulation saves energy significantly

After matching with the frequency converter, the speed can be adjusted in real time according to the load (such as reducing the air volume of the fan during low gas periods and slowing down the conveyor when it is unloaded), which can save 20%~40% energy compared to constant speed operation. Taking a 100kW fan with an annual operation of 8,000 hours as an example, the annual power saving after the frequency conversion can reach more than 160,000 degrees.

2.Popularization of high-efficiency energy efficiency grades

The new three-phase asynchronous motor (such as IE4 and IE5 grades) uses low-loss silicon steel and optimized magnetic circuit design, and its efficiency is 3%~5% higher than that of traditional motors, which meets the mine’s “double carbon” goals (such as excavators and crushers in open-pit mines give priority to high-efficiency motors).