Comefri motor Germany Comefri model Comefri price

Comefri motor is a type of motor that can be used in flammable and explosive environments, producing no electrical sparks during operation. Explosion-proof motors are mainly used in coal mines, oil and natural gas, petrochemical, and chemical industries. In addition, they are widely used in textiles, metallurgy, urban gas, transportation, grain and oil processing, papermaking, pharmaceuticals, and other sectors. As primary power equipment, explosion-proof motors are typically used to drive pumps, fans, compressors, and other transmission machinery.

Comefri motor control method

Motor Direct Torque Control technology: Direct Torque Control (Direct Self-Control, DSC) constructs flux linkage and electromagnetic torque models on the stator stationary coordinate system, achieving control of electromagnetic torque and stator flux linkage by applying different voltage vectors. The direct torque control method has advantages such as simple algorithms and good torque response; therefore, it is widely used in applications requiring high transient torque response. Due to inherent drawbacks in control, the direct torque control method exhibits low control frequency and large torque ripple at low speeds. Therefore, reducing torque ripple at low speeds has become a research hotspot in direct torque control methods. Sun Xiaohui and others achieved good results by optimizing the action time of voltage vectors to reduce torque ripple at low speeds. D.casadei and others applied the direct torque control method to the control of AC induction motors based on discrete space vector modulation technology, reducing torque ripple.

Comefri motor starting

The armature circuit resistance and inductance of the motor are small, while the rotating body has certain mechanical inertia. Therefore, when the motor is connected to the power supply, the armature speed and corresponding back EMF are very small at the beginning of starting, resulting in a large starting current. It can reach 15 to 20 times the rated current. This current will disturb the power grid, cause mechanical shock to the unit, and produce sparks at the commutator. Therefore, direct switching starting is only suitable for motors with power not greater than 4 kilowatts (starting current is 6 to 8 times the rated current). To limit the starting current, a specially designed variable resistor is often connected in series in the armature circuit; its principle wiring is shown in Figure 1. During the starting process, as the speed continues to rise, each section of resistance is short-circuited step by step in time, keeping the starting current within a certain allowable value. This starting method is called series resistance starting. It is very simple, the equipment is lightweight, and it is widely used in various small and medium-sized DC motors. However, due to high energy consumption during the starting process, it is not suitable for motors that start frequently or for medium and large DC motors. But for certain special needs, such as urban trams which start frequently, series resistance starting is usually adopted to simplify equipment, reduce weight, and facilitate operation and maintenance. For DC motors with larger capacity, reduced voltage starting is usually adopted. That is, a separate adjustable DC power supply supplies power to the motor armature; controlling the power supply voltage allows both smooth motor starting and speed regulation. This method involves more complex power equipment.

Comefri motor classification

A machine that converts mechanical energy into DC electrical energy. It mainly serves as a DC motor required for DC motors, electrolysis, electroplating, electric smelting, charging, and excitation power sources for AC generators. Although power rectifier components are also used to convert AC to DC where DC power is needed, AC rectified power sources cannot completely replace DC generators in terms of certain operating performances. A rotating device that converts DC electrical energy into mechanical energy. The motor stator provides the magnetic field, the DC power supply provides current to the rotor windings, and the commutator keeps the direction of the torque produced by the rotor current and magnetic field unchanged. DC motors can be divided into two categories based on whether they are equipped with common brush-commutators: brushed DC motors and brushless DC motors. Brushless DC motors are a new type of DC motor developed in recent years with the development of microprocessor technology, the application of new power electronic devices with high switching frequencies and low power consumption, the optimization of control methods, and the emergence of low-cost, high magnetic energy level permanent magnet materials. Brushless DC motors maintain the good speed regulation performance of traditional DC motors and have advantages such as no sliding contact and commutation sparks, high reliability, long service life, and low noise. Therefore, they have been widely used in aerospace, CNC machine tools, robots, electric vehicles, computer peripheral equipment, and household appliances. According to different power supply methods, brushless DC motors can be divided into two categories: square wave brushless DC motors, whose back EMF waveform and supply current waveform are both rectangular waves, also known as rectangular wave permanent magnet synchronous motors; and sine wave brushless DC motors, whose back EMF waveform and supply current waveform are both sine waves.

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