DRIVE SYSTEMS s.r.l. Motor Germany DRIVE SYSTEMS s.r.l. Model DRIVE SYSTEMS s.r.l. Price

DRIVE SYSTEMS s.r.l. A motor is a type of motor that changes its speed by altering the number of pole pairs, voltage, current, frequency, etc., to achieve higher performance. Due to their excellent performance, variable-speed motors are widely used in industrial sectors such as steel, power stations, cables, chemicals, petroleum, cement, textiles, printing and dyeing, papermaking, and machinery for stepless speed control of loads with constant torque or decreasing torque. They are particularly suitable for driving pumps and fans with significant flow variations, achieving good energy saving effects.

DRIVE SYSTEMS s.r.l. Motor structure

A motor can be regarded as a DC motor where electronic commutation replaces mechanical commutation. It mainly consists of a synchronous motor body, a power electronic inverter, a rotor position detector, and a controller. The rotor of the synchronous motor is primarily composed of permanent magnets and magnetic conductors. A permanent magnet brushless DC motor mainly consists of a permanent magnet motor body, a rotor position sensor, and an electronic commutation circuit. In terms of both structure and control method, permanent magnet brushless DC motors share many similarities with traditional DC motors: the rotor with permanent magnets replaces the stator poles of a brushed DC motor; the stator with multi-phase windings replaces the armature; and an electronic commutator composed of a solid-state inverter and a shaft position detector replaces the mechanical commutator and brushes.

DRIVE SYSTEMS s.r.l. Motor applications

Motors are primarily used as electric motors. They are the most widely used and highest-demand type of motor in industrial and agricultural production and various sectors of the national economy. Metal cutting machine tools, steel rolling equipment, blowers, crushers, water pumps, oil pumps, light industry machinery, textile machinery, mining machinery, etc., mostly use asynchronous motors for drive. In daily life, the application of asynchronous motors is also increasingly widespread; single-phase asynchronous motors are used in household appliances such as electric fans, washing machines, refrigerators, and air conditioners. In electric drive systems, the vast majority of drive motors are asynchronous motors, accounting for approximately 60% of the total grid load. Asynchronous motors are widely used because they offer advantages such as simple structure, ease of use, reliable operation, high efficiency, easy manufacturing, and low cost. The speed regulation performance of asynchronous motors themselves is relatively poor; therefore, DC motors are generally used in applications requiring a wide and smooth speed regulation range. Over the past one or two decades, AC speed control systems for asynchronous motors, developed based on power electronic devices and microcomputers, have improved their speed regulation performance, leading to even broader applications. During operation, asynchronous motors must absorb reactive power from the grid, which deteriorates the grid's power factor. However, since the grid's power factor can be compensated by other means, this does not hinder the widespread use of asynchronous motors.

DRIVE SYSTEMS s.r.l. Motor mechanical characteristics

Structurally, the motor's rotor is equipped with permanent magnets to provide the operating point for soft magnetic materials, while the stator excitation only needs to provide a changing magnetic field without consuming energy for the magnetic material's operating point. Therefore, this motor has high efficiency, low current, and low heat generation. Due to the presence of permanent magnets, the motor has strong back electromotive force (EMF) and good inherent damping, resulting in smooth operation, low noise, and low-frequency vibration. An induction subtype can be somewhat regarded as a low-speed synchronous motor. A four-phase motor can operate in four-phase mode or two-phase mode (bipolar voltage drive is required), whereas a reactive motor cannot do so. For example, four-phase and eight-phase operation (A-AB-B-BC-C-CD-D-DA-A) can fully adopt a two-phase eight-step operation mode. It is not difficult to find that the conditions are C=, D=. The internal winding of a two-phase motor is completely consistent with that of a four-phase motor. Low-power motors are generally directly connected as two-phase, while higher-power motors often have eight external leads (four-phase) for flexible use and to dynamically change the motor's characteristics. In this way, they can be used as four-phase motors, or the two-phase motor windings can be used in series or parallel.

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