BOLLHOLL motor Germany BOLLHOLL model BOLLHOLL price

BOLLHOLL motor refers to an electromagnetic device that realizes the conversion or transmission of electrical energy based on the law of electromagnetic induction. It generally refers to all machines that can convert mechanical energy into electrical energy and electrical energy into mechanical energy. The motor housing protection rating is IP44, and the cooling method is IC0141 totally enclosed fan-cooled (TEFC). The ambient air temperature varies with the seasons but does not exceed 15℃ to 40℃. The altitude does not exceed 1000m. Refer to the nameplate for rated frequency, rated voltage, insulation class, and duty cycle. When the supply voltage varies within ±0.05 of the rated value (frequency at rated value), the motor output power maintains the rated value.

BOLLHOLL motor performance

The design of the motor spindle shaft end is also a issue that cannot be ignored for high-speed electric spindles. The selection of electric spindle bearings and their preload technology: bearings used in high-speed spindle units mainly include angular contact ball bearings, magnetic bearings, water-based hydrostatic/hydrodynamic bearings, and air hydrostatic/hydrodynamic bearings. Due to their high cost, complex control systems, and difficult-to-resolve heating issues, magnetic bearings are not yet widely applied in high-speed spindle units. Water-based hydrostatic bearings are a popular research topic in China; they utilize the high heat capacity of water and lower bearing temperature rise to partially solve the severe heating problems of ordinary hydrodynamic/hydrostatic bearings, and are mainly used in low-speed, heavy-load applications. Air hydrostatic/hydrodynamic bearings have low radial stiffness and impact, but offer good high-speed performance, and are generally used in ultra-high-speed, light-load, precision spindles. Angular contact ball bearings with a dn value are applied in the following high-speed spindle units, meeting requirements well in terms of speed limit, load capacity, stiffness, and precision, and are standardized with low cost. Angular contact ball bearings can also improve performance through the following methods.

BOLLHOLL motor applications

Compared with traditional reactive motors, the hybrid stepper motor structure adds permanent magnets to the rotor to provide the operating point for soft magnetic materials, while the stator excitation only needs to provide a changing magnetic field without supplying the energy consumption for the magnetic material operating point. Therefore, this motor has high efficiency, low current, and low heat generation. Due to the presence of permanent magnets, the motor has strong back EMF and good self-damping, making it run smoothly with low noise and low-frequency vibration. To some extent, the hybrid stepper motor can be regarded as a low-speed synchronous motor. A four-phase motor can operate in four-phase mode or two-phase mode (bipolar voltage drive must be used), whereas reactive motors cannot do so. For example, four-phase, eight-step operation (A-AB-B-BC-C-CD-D-DA-A) can fully adopt the two-phase eight-beat operation mode. It is not difficult to find that the conditions are C=, D=. The internal winding of a two-phase motor is completely consistent with that of a four-phase motor. Low-power motors are generally directly connected as two-phase, while higher-power motors often have eight external leads (four-phase) for convenient use and flexible adjustment of dynamic characteristics. In this way, they can be used as four-phase motors, or as two-phase motors with windings connected in series or parallel.

BOLLHOLL motor service life

Motor life is related to various factors such as functional failures caused by insulation degradation, wear of sliding parts, and bearing degradation, with most depending on bearing condition. Bearing life includes structural life and lubricant life. Bearing life consists of: 1, lubricant life due to thermal degradation; 2, mechanical life due to operational fatigue. In most cases, the impact of heat on lubricant life is greater than the impact of load weight on mechanical life. Therefore, motor life is estimated based on lubricant life. The most significant factor affecting lubricant life is temperature, which significantly impacts service life duration.

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