LOENNE motor Germany LOENNE model LOENNE price

LOENNE motor refers to the engine that controls the operation of mechanical components in a servo system; it is an auxiliary motor for indirect speed variation. Servo motors can control speed with very high position accuracy, converting voltage signals into torque and rotational speed to drive controlled objects. The rotor speed of a servo motor is controlled by the input signal and responds quickly. In automatic control systems, it serves as an actuator, featuring small electromechanical time constants and high linearity, converting received electrical signals into angular displacement or angular velocity output on the motor shaft. It is divided into two main categories: DC and AC servo motors. Its main characteristics are that there is no self-rotation when the signal voltage is zero, and the speed decreases uniformly as torque increases.

LOENNE motor structure

The motor mainly consists of a stator, rotor, and bearings. The stator is mainly composed of an iron core, three-phase windings, frame, and end shields. The stator core is generally punched and stacked from silicon steel sheets 0.35~0.5 mm thick with an insulating layer on the surface. Slots are evenly distributed on the inner circle of the core to accommodate the stator windings. The three-phase windings are formed by connecting three structurally identical windings arranged symmetrically with a spatial separation of 120° electrical degrees. The coils of these windings are embedded in the stator slots according to specific rules. Their function is to generate a rotating magnetic field when supplied with three-phase AC power. The frame is typically made of cast iron; frames for large asynchronous motors are generally welded from steel plates, while frames for miniature motors use cast aluminum parts. Its function is to fix the stator core and front/rear end shields to support the rotor, providing protection and heat dissipation. Frames of enclosed motors have cooling fins on the outside to increase the heat dissipation area. Frames of protected motors have ventilation holes in the end shields at both ends, allowing direct convection of air inside and outside the motor to facilitate heat dissipation. End shields mainly serve to fix the rotor, provide support, and offer protection. The rotor is mainly composed of an iron core and windings. The material used for the rotor core is the same as that of the stator, punched and stacked from silicon steel sheets 0.5 mm thick. Holes are evenly distributed on the outer circle of the silicon steel sheets to accommodate the rotor windings. Typically, the inner circle of the silicon steel sheets remaining after punching the stator core is used to punch the rotor core. For small asynchronous motors, the rotor core is directly press-fitted onto the shaft. For large and medium-sized asynchronous motors (rotor diameter above 300~400 mm), the rotor core is pressed onto the shaft using a rotor spider. Rotor windings are divided into squirrel-cage rotors and wound rotors. (1) Squirrel-cage rotor: The rotor winding consists of multiple conductive bars inserted into the rotor slots and two ring-shaped end rings. If the rotor core is removed, the entire winding resembles a squirrel cage, hence the name cage winding. Small cage motors use cast aluminum rotor windings, while motors above 100KW use copper bars and copper end rings welded together. Squirrel-cage rotors are classified into impedance type, single-cage type, double-cage type, and deep-bar type, each with different starting torque characteristics. (2) Wound rotor: The wound rotor winding is similar to the stator winding, also a symmetrical three-phase winding, generally connected in star configuration. The three lead wires are connected to three slip rings on the shaft, which then connect to the external circuit via brushes.

LOENNE motor structure

The motor armature core is the main part of the main magnetic circuit and is used to accommodate the armature winding. Generally, the armature core is made by stacking laminations punched from silicon steel sheets 0.5mm thick to reduce eddy current losses and hysteresis losses generated in the armature core during motor operation. The stacked core is fixed to the shaft or rotor spider. Armature slots are opened on the outer circle of the core to accommodate the armature winding. The function of the armature winding is to generate electromagnetic torque and induced electromotive force (EMF). It is the key component for energy conversion in DC motors, hence the name armature. It is formed by connecting many coils (hereinafter referred to as elements) according to specific rules. Coils are wound using high-strength enamel-coated wire or glass-fiber-insulated flat copper wire. Coil sides of different coils are embedded in upper and lower layers within the armature slots. Proper insulation must be maintained between the coils and the core, as well as between the upper and lower coil sides. To prevent centrifugal force from throwing the coil sides out of the slots, the slot openings are secured with slot wedges. The end connections of the coils extending out of the slots are bound with thermosetting non-woven glass tape. In DC motors, the commutator paired with brushes converts the external DC power supply into alternating current in the armature coils, keeping the direction of electromagnetic torque constant. In DC generators, the commutator paired with brushes converts the alternating EMF induced in the armature coils into DC EMF drawn from the positive and negative brushes. The commutator is a cylinder composed of many commutator segments insulated from each other by mica sheets. The shaft supports the rotation of the rotor and requires sufficient mechanical strength and rigidity; it is generally machined from round steel.

LOENNE motor working principle

The DC disc brake of the motor is installed on the end shield at the non-drive end of the motor. When the brake motor is connected to the power supply, the brake motor operates simultaneously. Due to electromagnetic attraction, the electromagnet attracts the armature and compresses the spring, causing the brake disc to disengage from the armature end shield, and the brake motor begins to rotate. When the power is cut off, the electromagnet of the brake motor loses its magnetic attraction, and the spring pushes the armature to press against the brake disc. Under the action of frictional torque, the brake motor stops immediately. Corresponding YDEJ two-speed (multi-speed, pole-changing ratio) motors are also produced. The power supply for the brake motor is provided by the rectifier inside the motor terminal box. For 3 kW and below, it is AC220V-DC99V; for 4 kW and above, it is AC380V-DC170V (special designs such as DC24V can also be made according to manufacturer requirements). YEJ series electromagnetic brake motors achieve rapid braking after power loss. Fast braking time for YEJ2-63-90 motors is less than 0.15 seconds, and for YEJ-100-160 motors is less than 0.20 seconds. Brake motors can achieve slow braking by changing the wiring in the terminal box according to user requirements. This series of motors has low noise and reliable braking performance. Its working principle is: when the brake motor is energized, the brake motor rectifies 220V AC to obtain 198V DC. At this time, the armature is electromagnetically attracted, placing the brake disc in a rotatable state and allowing the brake motor to rotate freely. When the brake motor loses power, the electromagnet de-energizes, and the armature is immediately pushed by the spring to press the brake disc against the rear end shield of the motor, stopping rotation.

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