Hoyer Motors motor Germany Hoyer Motors model Hoyer Motors price

Hoyer Motors motors refer to motors with speeds exceeding 10000r/min. Due to their high speed, their volume is much smaller than that of ordinary motors of the same power. Connected directly to the prime mover, they eliminate traditional reduction gears. With low rotational inertia, high-speed motors offer advantages such as high power density, effective material savings, high transmission efficiency, low noise, and fast dynamic response.

Hoyer Motors motor service life

Motor life is related to various factors causing functional failures, such as insulation deterioration, wear of sliding parts, and bearing degradation; it largely depends on the bearing condition. Bearing life includes mechanical 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 effect of heat on lubricant life is more significant than the effect 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 greatly influences service life.

Hoyer Motors motor structure

The motor mainly consists of the stator, rotor, and end covers. The stator is made of laminated sheets to reduce iron losses during operation and contains three-phase AC windings, known as the armature. The rotor can be solid or made of laminated sheets, with permanent magnet materials mounted on it. Depending on the position of the permanent magnets on the rotor, permanent magnet synchronous motors can be classified into surface-mounted and interior types. Figure 1 shows the corresponding schematic diagrams. Surface-mounted rotors have a simple magnetic circuit structure and low manufacturing costs, but since start windings cannot be installed on the surface, asynchronous starting is not possible. Interior rotors have three main magnetic circuit structures: radial, tangential, and hybrid 3 types. The main difference lies in the relationship between the magnetization direction of the permanent magnets and the rotor rotation direction. Figure 2 shows the magnetic circuit structures of 3 different types of interior rotors. Since the permanent magnets are placed inside the rotor, pole shoes can be formed on the rotor surface. Inserting copper bars or cast aluminum into the pole shoes provides starting and damping functions, resulting in good steady-state and dynamic performance. Additionally, the asymmetry of the interior rotor magnetic circuit generates reluctance torque during operation, which helps improve the motor's power density and overload capacity. This structure also facilitates field weakening for speed expansion.

Hoyer Motors motor applications

The motor requires only a single-phase power supply, so it is widely used in small equipment for production and daily life. However, due to relatively poor economic performance indicators, it is only manufactured in low power ratings. Single-phase resistance-start asynchronous motor. Power ranges from 60 to 370W. Characteristics: No external phase-splitting components are added; it starts using the resistance of the auxiliary winding itself and uses a centrifugal switch to disconnect the auxiliary winding at the end of starting. The structure is relatively simple. It has medium starting torque and overload capacity, making it suitable for small machine tools, blowers, and medical machinery. Single-phase capacitor-start asynchronous motor. Power ranges from 120 to 750W. This is a single-phase motor that uses an external capacitor to increase starting torque. An external capacitor is connected in series with the auxiliary winding, and both the auxiliary winding and the capacitor are disconnected from the power supply by a centrifugal switch at the end of starting. Like the BO2 type, it operates with only the main winding, leaving the auxiliary winding idle. Capacitor-start motors have higher starting torque but medium overload capacity. They are suitable for air compressors, refrigerators, washing machines, grinding mills, threshers, and water pumps. Single-phase capacitor motor. This is a single-phase motor that uses one capacitor for both starting and running. The auxiliary winding, capacitor, and main winding all participate in operation. Therefore, no centrifugal switch is needed. Proper design creates an ideal rotating magnetic field during operation, resulting in good motor performance, high efficiency and power factor, and low noise. Its power range is 4 to 250W. Since one capacitor serves both starting and running, and considering the pros and cons, the starting time is very short. When selecting the capacitor value, priority is given to meeting the needs of long-term operation, so inexpensive, small-value capacitors are chosen. Consequently, this motor has lower starting torque and can only be used in machinery that starts under no-load or light-load conditions, such as electric fans, ventilation fans, and tape recorders. Dual-value capacitor motors have higher power, and the required capacitors are much more expensive. These motors have good starting and running performance. Suitable for household appliances and small machine tools.

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