NEWS

Three-phase motors are 10% to 15% more efficient compared to single-phase motors. The starting torque for three-phase motors is in the range of 150% to 200% of rated torque. Further, they provide smooth power with negligible vibration and noise levels that are 5 to 10 decibels lower. They are applicable when the power requirement is above 10,000 watts. The mean time to failure is over 40,000 hours for three-phase induction motors, and maintenance costs are lower. Higher Operating Efficiency Efficiency in three-phase motor operation is usually 10% to 15% better compared to single-phase motors because the three voltage phases of a three-phase power supply are out of phase from each other by 120 electrical degrees, hence they can create a constant and continuous rotating magnetic field that enables energy conversion

Three-phase motors are commonly used in industrial equipment (like pumps and compressors) and agricultural machinery to increase production efficiency due to their 95% energy utilization rate. When applied to irrigation pumps, they can save more than 30% on electricity costs and require only 60% of the maintenance costs compared to traditional motors. Application in Automated Production Lines In modern industry, three-phase motors have become the main power source in automated production lines. These motors can provide up to 95% energy utilization, saving about 20% in electricity costs compared to single-phase motors, and are widely used in various kinds of production equipment. For example, in car manufacturing plants, three-phase motors drive robotic arms that perform up to 150 precision welding operations per minute, whereas conventional equipment typically achieves no more than

High temperatures affect three-phase motors by aging the insulation, increasing the resistance, and reducing the efficiency. For instance, research has determined that for every 10°C rise in temperature, the life expectancy of the insulation material is reduced by half. If the ambient temperature increases to 50°C, the efficiency may fall by 5% to 10%, which will increase energy consumption. For example, a 100 kW rated motor may require more input power in high temperatures. In order to avoid overheating, it should be regularly monitored for motor temperature, and good cooling systems provided, insulation materials that bear high temperature used, and lubricant replaced regularly. Insulation Aging The three-phase motor insulation system consists mainly of a variety of materials, including paper insulation, varnish insulation, and layers of polymer insulation. The selection of

Shielded cable, optimization of wiring, use of filters, and good grounding hold the key to the reduction in EMI in three-phase motors. Double-shielded cables can reduce high-frequency interference by 50-70%, the grounding resistance should be controlled below 1 ohm, and the grounding wire length should not be more than 1 meter. On the power side, install a three-phase power filter with an attenuation rate of 60dB, add a sine wave filter at the inverter output, and it can reduce more than 40% of the radiated noise. In wiring, the power lines and signal lines should be at least 30 centimeters apart and in a 90-degree crossing pattern to reduce electromagnetic coupling area and suppress 30-50% of induced interference. Use Shielded Cables and Proper Grounding The shielding and grounding of cables

When installing a three-phase motor, the motor’s power must match the load it will be driving. Running a 15kW-rated motor at 50-70% load will avoid overloading that may eventually lead to failures. Wiring, power supply voltage, and good ventilation must also be considered to prolong the motor’s lifespan. The power supply should be sufficient and stable First of all, to ensure sufficient and stable power for a three-phase motor, check whether the supply voltage and current meet the motor’s requirements. Normally, a voltage of 380V or higher is needed for three-phase motors. If the voltage is too low, this would lead to insufficient motor power and lower production efficiency. Even if a 15kW-rated motor is used, if the supply voltage remains under 350V for an extended period, the motor’s actual

One can use a multimeter to check the winding resistance of a three-phase motor where the normal value should fall between 0.5-10 ohms, and insulation resistance should be checked with a megohmmeter; a value below 1MΩ indicates an insulation problem. Current balance should be monitored: a difference of more than 15% is unacceptable. Measuring Winding Resistance with a Multimeter One of the most common ways to check if a motor is short-circuited is by measuring the winding resistance using a multimeter. First, the motor should be completely powered off and isolated from the power supply to avoid any misoperation that could result in electric shock or damage to the equipment. When using a multimeter to measure the resistance between the three-phase windings of the motor, measure the U, V, and

Wear insulated gloves and protective goggles, and check the wiring for tightness. A multimeter can be used to measure the resistance, which should be less than 0.5 ohms. Cut off the power supply for at least 5 minutes before performing maintenance to avoid the risk of electric shock. Proper Wearing of Personal Protective Equipment Proper wearing of personal protective equipment is a necessity when operating a three-phase motor. It minimizes the chances of accidents and ensures the operator’s safety in critical situations. Insulated gloves should always be worn. OSHA requires that operators use insulated gloves while operating in any place with a voltage greater than 50 volts. Generally, the voltage of three-phase motors is higher than 380 volts, so wearing insulated gloves can prevent electric shock. High-quality insulated gloves on

Generally speaking, three-phase motors are used for applications that require high power and efficiency. These applications include heavy machinery, HVAC systems, automated production lines, and water pump systems. Efficiency in three-phase motors reaches as high as 95% compared to single-phase motors, resulting in a reduction of energy consumption by about 15%. In industrial production, the use of three-phase motors ensures that equipment operates for long periods while failure rates are reduced. Lower startup current minimizes impact on the power grid. This makes the use of three-phase motors in long-term applications more economically viable, hence they are widely applied in major equipment found in factories and buildings. Power Transmission in Industrial Equipment Power transmission lies at the very center of the operation of any production line in industry. All these devices—large

The sizing of a three-phase motor should be determined according to the required power, speed, and voltage for the actual load of the equipment. For example, if the rated power of the equipment is 10 kW, the power of the motor should fall between 11 and 12 kW to avoid being underpowered or overloaded, which may result in malfunction. Key Points for Selecting Three-Phase Motor Specifications The most important factor in choosing the specifications of a three-phase motor is to ensure that the motor’s power meets the actual needs of the equipment. If the motor is too weak, it may overheat during long-term operation, shortening its life or burning the coil. According to industry statistics, about 30% of motor failures are caused by improper selection, so the following aspects should be considered

The formula for calculating the output power of a three-phase motor is P = √3 × U × I × cosφ. As seen from the above formula, for a voltage of 400 volts, a current of 10 amps, and a power factor of 0.85, the output power is around 5.9 kW. Needless to say, precise measurement of voltage and current is important. The relationship between current, voltage, and power The relationship between current and voltage is the major factor affecting the power output in a three-phase motor. In general, the formula for calculating power in motors is: P = √3 × U × I × cosφ, where P is the active power of the motor in kilowatts; U is the line voltage of the motor in volts; I is the