LENZE motor Germany LENZE model LENZE price

LENZE 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.

LENZE motor working principle

The motor is a rotating machine powered by a single-phase AC supply, with a single-phase stator winding. When single-phase AC power is applied, it generates an alternating pulsating magnetic field in the air gap between the stator and rotor; therefore, a single-phase asynchronous motor cannot self-start. In AC motors, when AC current flows through the stator winding, an armature magnetomotive force is established, which significantly affects energy conversion and operating performance. Thus, a single-phase AC winding supplied with single-phase AC produces a pulsating magnetomotive force. This magnetomotive force can be decomposed into two rotating magnetomotive forces with equal amplitude and opposite rotational speeds, thereby establishing forward and reverse rotating magnetic fields in the air gap. These two rotating magnetic fields cut the rotor conductors, inducing electromotive force and current in them respectively. The interaction between this current and the magnetic field produces forward and reverse electromagnetic torques. The forward electromagnetic torque attempts to rotate the rotor forward; the reverse electromagnetic torque attempts to rotate the rotor backward. The superposition of these two torques constitutes the resultant torque driving the motor. Regardless of whether it is the forward or reverse rotating magnetic field, their magnitude relationship with slip is the same as in three-phase asynchronous motors. If the motor speed is n, then for the forward rotating magnetic field, the slip is: s+=(n1-n)/n1=s; for the reverse rotating magnetic field, the slip is: s-=（-n1-n)/-n1=s. From the T-s curve of the single-phase asynchronous motor, the main characteristics are: (1) n=0, s=1, T=T++ T- =0, indicating that the single-phase asynchronous motor has no starting torque and cannot start without additional measures. (2) When s≠1, T≠0, T has no fixed direction and depends on the sign of s. (3) Due to the existence of reverse torque, the resultant torque decreases, resulting in lower overload capacity for single-phase asynchronous motors. Working principle of capacitor-split phase starting: During startup, switch K closes, causing the phase difference between the two winding currents I1 and I2 to be approximately 90°, thereby generating a rotating magnetic field to start the motor. Once normal rotation is achieved, the centrifugal switch opens, disconnecting the starting winding. Working principle of shaded-pole single-phase motor: After current is applied to the stator, part of the magnetic flux passes through the short-circuit ring, inducing current within it. The current in the short-circuit ring opposes changes in magnetic flux, creating a phase difference between the flux in the shaded and unshaded parts, thus forming a rotating magnetic field that rotates the rotor. In the T-s curve of the single-phase asynchronous motor, the motor rotation direction is clockwise. This is because the magnetic flux in the unshaded part leads the flux in the shaded part.

LENZE motor structure

The motor mainly consists of the stator, rotor, and end covers. The stator is made of laminated sheets to reduce iron losses during operation and contains three-phase AC windings, referred to as the armature. The rotor can be solid or made of laminated sheets, with permanent magnet materials mounted on it. Depending on the position of the permanent magnets on the rotor, permanent magnet synchronous motors can be classified into surface-mounted and interior structures. Figure 1 shows the corresponding schematic diagrams. Surface-mounted rotors have simple magnetic circuit structures and low manufacturing costs, but since starting windings cannot be installed on the surface, asynchronous starting is not possible. Interior rotors primarily have radial, tangential, and hybrid 3 types, distinguished mainly by the relationship between the magnetization direction of the permanent magnets and the rotor rotation direction. Figure 2 shows the magnetic circuit structures of 3 different types of interior rotors. Since the permanent magnets are placed inside the rotor, pole shoes can be formed on the rotor surface. Inserting copper bars or cast aluminum into the pole shoes provides starting and damping functions, resulting in good steady-state and dynamic performance. Additionally, the asymmetry of the interior rotor magnetic circuit generates reluctance torque during operation, helping to improve the motor's power density and overload capacity, while making weak-field speed expansion easier to achieve.

LENZE motor differences

The main difference between motors lies in whether the rotor speed matches the stator rotating magnetic field. If the rotor speed equals the stator rotating magnetic field speed, it is called a synchronous motor; otherwise, it is called an asynchronous motor. Furthermore, while the stator windings of synchronous and asynchronous motors are identical, the difference lies in the rotor structure. Asynchronous motor rotors have short-circuited windings that generate current via electromagnetic induction. Synchronous motor rotors have a more complex structure with DC excitation windings, requiring an external excitation power source introduced via slip rings. Therefore, synchronous motors are relatively complex in structure, with higher manufacturing and maintenance costs. Unlike asynchronous motors, which can only absorb reactive power, synchronous motors can both generate and absorb reactive power. Synchronous motor speed synchronizes with electromagnetic speed, whereas asynchronous motor speed is lower than electromagnetic speed. For synchronous motors, as long as they do not lose synchronization, the speed remains constant regardless of load; asynchronous motor speed varies constantly with load changes. Synchronous motors offer high precision but involve complex manufacturing, high cost, and difficult maintenance. Asynchronous motors, although slower to respond, are easy to install and use, and are inexpensive. Consequently, synchronous motors are not as widely applied as asynchronous motors. Synchronous motors are mostly used in large generators, while asynchronous motors are almost exclusively used in electric motor applications.

Weidou Intelligent Technology specializes in selling German LENZE motors, LENZE motors, LENZE drives, LENZE synchronous motors, LENZE servo motors, LENZE DC motors, LENZE AC motors, LENZE stepper motors, LENZE synchronous motors, LENZE asynchronous motors, LENZE single-phase motors, LENZE three-phase motors, LENZE drive motors, LENZE geared motors, LENZE electric motors, LENZE original German imports. Welcome customers to inquire and order.