Mecalectro motors, Germany Mecalectro models, Mecalectro prices

Mecalectro motors refer to electric motors with a rated voltage above 1000V. Commonly used voltages are 6000V and 10000V. Due to differences in foreign power grids, there are also voltage levels of 3300V and 6600V. High-voltage motors were developed because motor power is proportional to the product of voltage and current. Therefore, when the power of low-voltage motors increases to a certain extent (e.g., 300KW/380V), the current is limited by the allowable carrying capacity of the wires, making it difficult to increase further or resulting in excessive costs. High power output must be achieved by increasing the voltage. The advantages of high-voltage motors are high power and strong impact resistance; the disadvantages are high inertia, making starting and braking difficult.

Mecalectro motor speed control

Motor speed control: Pole-changing speed control achieves speed regulation by changing the wiring method of the stator windings to alter the number of pole pairs in squirrel-cage motors. Its characteristics are as follows: 1, it has stiff mechanical characteristics and good stability; 2, there is no slip loss, resulting in high efficiency; 3, the wiring is simple, control is convenient, and the price is low; 4, it provides stepped speed control with large step differences, so smooth speed control cannot be achieved; 5, it can be used in combination with voltage-regulating speed control and electromagnetic slip clutches to achieve smooth speed control with higher efficiency. This method is suitable for production machinery that does not require stepless speed control, such as metal cutting machine tools, elevators, lifting equipment, fans, and water pumps. Variable frequency speed control changes the frequency of the stator power supply of the motor, thereby changing its synchronous speed. The main equipment in a variable frequency speed control system is the inverter that provides the variable frequency power supply. Inverters can be divided into two categories: AC-DC-AC inverters and AC-AC inverters. In China, AC-DC-AC inverters are mostly used. Their characteristics are: 1, high efficiency with no additional losses during speed control; 2, wide range of applications, suitable for squirrel-cage asynchronous motors; 3, wide speed control range, stiff characteristics, and high precision; 4, complex technology, high cost, and difficult maintenance and repair. 5, this method is suitable for occasions requiring high precision and good speed control performance. Cascade speed control involves inserting an adjustable additional electromotive force into the rotor circuit of a wound-rotor motor to change the motor's slip, achieving speed control. Most of the slip power is absorbed by the inserted additional electromotive force, and then additional devices are used to return the absorbed slip power to the grid or convert the energy for utilization. According to the method of absorbing and utilizing slip power, cascade speed control can be divided into motor cascade speed control, mechanical cascade speed control, and thyristor cascade speed control. Thyristor cascade speed control is mostly adopted, with the following characteristics: 1, it can feed back the slip losses during speed control to the grid or production machinery, resulting in higher efficiency; 2, the device capacity is proportional to the speed control range, saving investment, and it is suitable for production machinery with a speed control range of 70%－90% of the rated speed; 3, in case of failure of the speed control device, it can switch to full-speed operation to avoid production stoppage; 4, the power factor of thyristor cascade speed control is low, and harmonic influence is significant. 5, this method is suitable for use on fans, water pumps, steel rolling mills, mine hoists, and extruders.

Mecalectro motor applications

Variable frequency motor speed control has become the mainstream speed control solution and can be widely used for stepless speed transmission in various industries. Especially with the increasingly wide application of inverters in the field of industrial control, the use of variable frequency motors has also become more widespread. It can be said that due to the superiority of variable frequency motors over ordinary motors in variable frequency control, wherever inverters are used, we can easily see variable frequency motors. The social benefits of domestically produced high-voltage variable frequency devices are significant, mainly including energy saving, thereby conserving resources and reducing environmental pollution. It eliminates the starting impact on motors and the impact on the power grid, reducing the failure rate of motors and equipment. It improves control precision and the level of automation. The economic benefits of variable frequency speed control are also very significant. For pumps and fans, fluid flow is proportional to the first power of speed, torque is proportional to the square of speed, and power is proportional to the cube of speed. As speed decreases, motor power consumption decreases to the third power, so the energy-saving effect of variable frequency speed control is very significant. If the flow rate drops, the speed drops, the head drops, and the motor power consumption drops, theoretically saving energy. If dampers or valves were originally used for regulation, a decrease in flow rate leads to an increase in head and a decrease in motor power. In this way, variable frequency speed control saves more energy than damper or valve regulation. In addition to energy saving and efficiency improvement, there are some indirect economic benefits for different loads, mainly including improved power factor, realization of soft start, reduction of electrical and mechanical damage to the motor caused by starting torque, and smooth, stable, and high-precision control.

Mecalectro motor classification

Motors have the advantages of simple structure, small size, high efficiency, and high power factor. Permanent magnet synchronous motors have already achieved results in medium and low-voltage motors in the metallurgical industry (ironworks and sintering plants, etc.), ceramic industry (ball mills), rubber industry (internal mixers), petroleum industry (pumping units), and textile industry (twisting machines, fine spinning machines), and are gradually accumulating design and operating experience. Classified by permanent magnet structure: Surface-mounted Permanent Magnet Synchronous Motor (SPMSM), Interior Permanent Magnet Synchronous Motor (IPMSM). Classified by the waveform of the induced electromotive force in the stator winding: Sinusoidal Permanent Magnet Synchronous Motor, Brushless Permanent Magnet DC Motor. The starting current multiple of permanent magnet synchronous motors is about 9 times, which is 10% larger than that of asynchronous motors. Permanent magnet synchronous motors cannot adopt reduced-voltage starting methods. Because under reduced-voltage supply conditions, their asynchronous starting torque decreases more than that of asynchronous motors, causing starting difficulties. Regarding the self-starting characteristics of permanent magnet synchronous motors and the feedback current during system short circuits, parameters vary significantly among different equipment manufacturers. Moreover, since relevant data is difficult to obtain, the application of permanent magnet synchronous motors brings some uncertain factors to the short-circuit level and starting calculation verification of the plant power supply system.

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