Leantechnik motor Germany Leantechnik model Leantechnik price

Leantechnik motor is a single-phase AC commutator motor, suitable for single-phase power supply applications requiring speed regulation and reversal of rotation direction. The stator winding is powered by a single-phase source, and the rotor is an armature winding with a commutator short-circuited via brushes. The brushes can be moved to any position relative to the stator winding as needed. By shifting this position, the rotor's direction of rotation, mechanical characteristics, and operating speed can be changed. When the brushes deviate counterclockwise from the geometric neutral axis, the rotor rotates clockwise; when the brushes deviate clockwise from the geometric neutral axis, the rotor rotates counterclockwise.

Leantechnik motor speed control

Motor speed control: Principle of wound-rotor induction motor speed control using a current-source PWM converter: The rotor electrical energy of the induction motor is converted from AC to DC by an uncontrolled rectifier consisting of a diode bridge. The current-source PWM converter then converts the DC electrical energy into AC electrical energy with grid frequency, adjustable current amplitude, and adjustable phase. The converted energy is fed back to the grid for reuse via an autotransformer. This speed control scheme has the following features while achieving speed regulation: (1) The transformer input/output requires only a fixed ratio, and electrical isolation between input and output is not necessary; therefore, this scheme uses an autotransformer, significantly reducing transformer costs. (2) The AC side output current of the current-source PWM converter is a pulse current containing several harmonics. To ensure normal operation of the power system and ensure that the energy fed back to the grid meets international harmonic standards, it is essential to take appropriate filtering measures at the connection point between the PWM converter and the grid. (3) The AC side output current of the current-source PWM converter is sinusoidal after filtering, and the phase angle is controllable. Therefore, an appropriate control scheme can address harmonic and power factor issues in the speed control system while achieving motor speed regulation. This offers clear advantages over thyristor cascade speed control. ① AC voltage regulation speed control; ② Rotor series resistance AC speed control; ③ AC cascade speed control. A wound-rotor induction motor has its primary winding on the stator connected to the power supply, and the rotor has a polyphase winding connected to slip rings. The three-phase symmetrical windings of the rotor can be connected in Y configuration or delta configuration. A characteristic of this rotor is that external resistors can be connected to the rotor winding to improve the motor's starting performance or to regulate speed.

Leantechnik motor starting methods

Motor starting methods: First, split-phase starting, assisted by an auxiliary starting winding. Its starting torque is low. The operating speed remains roughly constant. It is mainly used in motors for electric fans, air conditioner fans, washing machines, etc. Second, when the motor is stationary, the centrifugal switch is closed. Upon powering up, the starting capacitor participates in the starting process. When the rotor speed reaches 70% to 80% of the rated value, the centrifugal switch automatically opens, the starting capacitor completes its task and is disconnected. The starting winding does not participate in operation, and the motor continues to operate via the running winding coil. Third, when the motor is stationary, the centrifugal switch is closed. Upon powering up, the starting capacitor participates in the starting process. When the rotor speed reaches 70% to 80% of the rated value, the centrifugal switch automatically opens, the starting capacitor completes its task and is disconnected. The running capacitor is connected in series with the starting winding to participate in operation. This connection is generally used in places with heavy and unstable loads, such as air compressors, cutting machines, and woodworking machine tools, as shown in Figure C. For motors with a centrifugal switch, if the motor fails to start successfully within a very short time, the winding coils will burn out quickly. Capacitance values: Dual-value capacitor motors have a large starting capacitance and a small running capacitance, with a voltage rating generally greater than 400 V. Forward and reverse control: Typically, the resistance of the starting winding and the running winding of such motors is the same, meaning the wire diameter and number of turns are identical. This type of motor is commonly used in washing machines. This forward and reverse control method is simple and does not require complex changeover switches. Forward and reverse control can be achieved simply by swapping lines 1–2 or swapping lines 3–4. Identification of starting and running windings: Typically, the DC resistance of the starting winding is much higher than that of the running winding, which can be measured with a multimeter. Generally, the DC resistance of the running winding is a few ohms, while the DC resistance of the starting winding is tens to hundreds of ohms.

Leantechnik motor classification

The vibration of the vibrating body is generated by two excitation systems, and its vibration form is called composite vibration. There are generally two forms: dual-frequency composite and dual-amplitude composite. Certain special-performance vibrating screening equipment uses two vibration motors of different models and speeds, installed at the feed end and discharge end of the screening machinery, respectively. This causes large-amplitude, low-frequency vibration at the feed end and small-amplitude, high-frequency vibration at the discharge end. The two vibrations overlap in the middle of the screening machinery, making the screening process more effective. If the projection of the vibration trajectory of the vibrating body on the horizontal plane is a circle or an ellipse, its vibration form is called rotary vibration. Rotary vibration can be divided into three forms: planar rotary vibration, vortex rotary vibration, and complex rotary vibration. When the projection of the vibration trajectory of the vibrating body on the vertical plane is a horizontal straight line, its vibration form is called planar rotary vibration; when the projection is an inclined straight line, its vibration form is called vortex rotary vibration; when the projection is a circle or an ellipse, its vibration form is called complex rotary vibration. Vibrating machinery excited by vertical vibration motors usually produces rotary vibration, the specific form of which depends on the angle between the excitation blocks at both ends of the vertical vibration motor. Alternatively, two horizontal vibration motors can be installed on both sides of the vibrating equipment with their shafts set at a specified angle, causing the vibrating machinery to produce rotary vibration.

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