Siemens Loher motors, German Siemens Loher models, Siemens Loher prices

Siemens Loher 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 emerged 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 (such as 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. It is necessary to increase the voltage to achieve high-power output. The advantages of high-voltage motors are high power and strong ability to withstand shocks; the disadvantages are high inertia, making starting and braking difficult.

Siemens Loher motor principle

When symmetrical voltage is applied to the motor stator windings, a rotating air-gap magnetic field is generated. The rotor winding conductors cut this magnetic field, generating an induced electromotive force (EMF). Since the rotor windings are in a short-circuit state, a rotor current is produced. The interaction between the rotor current and the air-gap magnetic field generates electromagnetic torque, thereby driving the rotor to rotate. The motor speed must be lower than the synchronous speed of the magnetic field, because only in this way can the rotor conductors induce EMF, thereby generating rotor current and electromagnetic torque. Therefore, this motor is called an asynchronous motor, also known as an induction motor. The motor speed (rotor speed) is less than the speed of the rotating magnetic field, hence it is called an asynchronous motor. It is basically the same as an induction motor. s = (ns-n) / n, where s is the slip rate, ns is the magnetic field speed, and n is the rotor speed. There are many types of asynchronous motors, including explosion-proof three-phase asynchronous motors, ys series three-phase asynchronous motors, y, y2 series three-phase asynchronous motors, and YVP series variable frequency speed control motors, etc.

Siemens Loher motor structure

The motor is divided into two parts: the stator and the rotor. Note: Do not confuse the commutating pole with the commutator. The stator includes: main magnetic poles, frame, commutating poles, brush gear, etc. The rotor includes: armature core, armature (shu) winding, commutator, shaft, fan, etc. The rotor part of a DC motor consists of the armature core, armature, commutator, and other components. The following provides a detailed introduction to each component in the structure. 1. Armature core part: Its function is to house the armature winding and conduct magnetic flux, in order to reduce eddy current loss and hysteresis loss generated in the armature core during motor operation. 2. Armature part: Its function is to generate electromagnetic torque and induced electromotive force for energy conversion. The armature winding consists of many coils, or glass-fiber-wrapped flat copper wires, or high-strength enamel-coated wires. 3. The commutator, also known as the rectifier, serves to convert the direct current from the brushes into alternating current within the armature winding in a DC motor, ensuring that the direction of the electromagnetic torque remains stable. In a DC generator, it converts the alternating electromotive force in the armature winding into direct electromotive force output at the brush terminals. The commutator is a cylinder composed of many segments insulated from each other by mica. Each end of every coil in the armature winding is connected to two separate commutator segments. In a DC generator, the function of the commutator is to convert the alternating electromotive force in the armature winding into direct electromotive force between the brushes, allowing current to flow through the load. The DC generator outputs electrical power to the load, while current also flows through the armature coils. It interacts with the magnetic field to generate electromagnetic torque, whose direction is opposite to that of the generator. The prime mover must overcome this magnetic torque to drive the armature rotation. Therefore, while the generator outputs electrical power to the load, it also receives mechanical power from the prime mover, achieving the function of converting mechanical energy into electrical energy in a DC generator.

Siemens Loher motor speed measurement methods

A motor converts pulse signals into angular displacement or linear displacement. First, it has good overload capability. Its speed is not affected by the load size, unlike ordinary motors, where speed drops when the load increases. Stepper motors have strict requirements for speed and position during use. Second, control is convenient. Stepper motors rotate in "steps," with obvious digital characteristics. Third, the overall machine structure is simple. Traditional mechanical speed and position control structures are complex and difficult to adjust. Using stepper motors simplifies and compacts the overall machine structure. A tachometer generator converts rotational speed into voltage and transmits it to the input end as a feedback signal. A tachometer generator is an auxiliary motor. Installing a tachometer generator at the tail end of an ordinary DC motor allows the voltage generated by the tachometer generator to be fed back to the DC power supply, thereby achieving the purpose of controlling the DC motor speed.

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