Buehler motor Germany Buehler model Buehler price

Buehler motors refer to motors that can operate on both DC and AC power supplies. These electric motors are widely used in daily household appliances, manual devices, computing tools, and precision machinery. In addition, they are frequently used in medical equipment, communication technology, measurement technology, the film industry, and many other fields.

Buehler motor mechanical characteristics

The motor has the following features: Class B temperature rise design, Class F insulation manufacturing. It uses polymer insulating materials and vacuum pressure impregnation manufacturing processes, as well as a special insulation structure, which greatly improves the insulation voltage resistance and mechanical strength of the electrical windings. This is sufficient to handle high-speed motor operation and resist the impact of high-frequency currents from inverters and voltage damage to insulation. High balancing quality, vibration level is Class R (vibration reduction level). Mechanical components are processed with high precision, and specialized high-precision bearings are used, allowing for high-speed operation. The forced ventilation cooling system uses imported axial flow fans that are ultra-quiet, long-life, and provide strong airflow. This ensures effective heat dissipation at any speed, enabling long-term operation at high or low speeds. The YP series motors, designed using AMCAD software, have a wider speed regulation range and higher design quality compared to traditional variable frequency motors. Special magnetic field design further suppresses high-order harmonic magnetic fields to meet design indicators for wide frequency, energy saving, and low noise. It features wide-range constant torque and power speed regulation characteristics, with smooth speed regulation and no torque pulsation. It has good parameter matching with various inverters. Combined with vector control, it can achieve full torque at zero speed, high torque at low frequency, high-precision speed control, position control, and fast dynamic response control. The YP series variable frequency dedicated motors can be equipped with brakes and encoders, enabling precise stopping and high-precision speed control through closed-loop speed control. Using a "gearbox + variable frequency dedicated motor + encoder + inverter" configuration achieves precise control of ultra-low speed stepless speed regulation. The YP series variable frequency dedicated motors have good universality; their installation dimensions comply with IEC standards and are interchangeable with general standard motors.

Buehler motor working principle

When the motor is operating, three-phase symmetrical current flows through the stator's three-phase windings, and DC current flows through the rotor's excitation winding. When three-phase alternating current flows through the stator's three-phase symmetrical windings, a rotating magnetic field is generated in the air gap. When DC current flows through the rotor excitation winding, a stationary magnetic field with constant polarity is generated. If the number of pole pairs in the rotor magnetic field equals the number of pole pairs in the stator magnetic field, the rotor magnetic field rotates synchronously with the stator's rotating magnetic field due to the magnetic pull of the stator field. That is, the rotor rotates at the same speed and direction as the rotating magnetic field. This is the basic working principle of a synchronous motor. There are three main operating modes for synchronous motors: as a generator, as a motor, and as a compensator. Operating as a generator is the primary mode for synchronous motors. Operating as a motor is another important mode. The power factor of synchronous motors can be adjusted. In applications where speed regulation is not required, using large synchronous motors can improve operating efficiency. Small synchronous motors are increasingly used in variable frequency speed regulation systems. Synchronous motors can also be connected to the grid as synchronous compensators. In this case, the motor carries no mechanical load; by adjusting the excitation current in the rotor, it supplies the required inductive or capacitive reactive power to the grid to improve the grid power factor or regulate grid voltage. Like other types of rotating machines, synchronous generators consist of two main parts: a stationary stator and a rotatable rotor. They are generally divided into rotating-field synchronous motors and rotating-armature synchronous motors. The most common type is the rotating-field synchronous generator. Its stator core has slots evenly distributed on the inner circle, with three-phase symmetrical windings arranged according to a specific pattern embedded in the slots. The stator of this synchronous motor is also called the armature, and the stator core and windings are called the armature core and armature windings. The rotor core is equipped with paired magnetic poles of a specific shape. Excitation windings are wound around the magnetic poles. When DC current is applied, a distributed magnetic field with alternating polarities is formed in the motor's air gap, known as the excitation magnetic field (also called the main magnetic field or rotor magnetic field). The prime mover drives the rotor to rotate (inputting mechanical energy into the motor). The excitation magnetic field with alternating polarities rotates with the shaft and sequentially cuts across the stator phase windings (equivalent to the conductors of the windings cutting the excitation magnetic field in reverse).

Buehler motor common questions

Why do motors generate shaft currents? The current in the loop consisting of the motor shaft, bearing housing, and base is called shaft current. Causes of shaft current: (1) Asymmetric magnetic field; (2) Harmonics in the supply current; (3) Poor manufacturing or installation, causing uneven air gaps due to rotor eccentricity; (4) Gaps between the two halves of a detachable stator core; (5) Improper selection of the number of segments in a fan-shaped stacked stator core. Hazards: Erosion of the motor bearing surface or balls, forming pinpoint micro-pores, deteriorating bearing performance, increasing friction loss and heat generation, and ultimately causing bearing burnout. Prevention: (1) Eliminate pulsating magnetic flux and power supply harmonics (e.g., by installing AC reactors on the inverter output side); (2) During motor design, insulate the bearing housing and base of sliding bearings, and insulate the outer ring and end cap of rolling bearings. Two Why can't general motors be used in high-altitude areas? Altitude has adverse effects on motor temperature rise, motor corona (for high-voltage motors), and commutation in DC motors. Attention should be paid to the following three aspects: (1) At high altitudes, motor temperature rise increases, and output power decreases. However, if the temperature drop with increasing altitude is sufficient to compensate for the effect on temperature rise, the motor's rated output power can remain unchanged; (2) Anti-corona measures must be taken when using high-voltage motors at high altitudes; (3) Altitude adversely affects DC motor commutation, so attention must be paid to the selection of carbon brush materials. Three Why should motors not operate under light load? Light load operation of motors causes: (1) Low motor power factor; (2) Low motor efficiency. This results in equipment waste and uneconomical operation. (1) Excessive load; (2) Phase loss; (3) Blocked air ducts; (4) Prolonged low-speed operation; (5) Excessive power supply harmonics. Four Why shouldn't motors in cold environments be started arbitrarily? Prolonged exposure to low temperatures can cause: (1) Cracking of motor insulation; (2) Freezing of bearing grease; (3) Pulverization of solder at wire joints. Therefore, motors should be stored with heating in cold environments, and windings and bearings should be inspected before operation. Five What are the causes of three-phase current imbalance in motors? (1) Three-phase voltage imbalance; (2) Poor welding or contact in a certain phase branch inside the motor; (3) Inter-turn short circuit in motor windings, or ground/phase-to-phase short circuits; (4) Wiring errors.

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