MS-GRAESSNER motor Germany MS-GRAESSNER model MS-GRAESSNER price

MS-GRAESSNER motors are a type of electric motor powered by simultaneously connecting to 380V three-phase AC current (phase difference 120 degrees). Because the rotor of a three-phase asynchronous motor rotates in the same direction but at a different speed than the stator's rotating magnetic field, there is slip, hence the name three-phase asynchronous motor. The rotor speed of a three-phase asynchronous motor is lower than the speed of the rotating magnetic field. The rotor windings generate electromotive force and current due to relative motion with the magnetic field, and interact with the magnetic field to produce electromagnetic torque, achieving energy conversion.

MS-GRAESSNER motor advantages

Advantages of motors: Compared to asynchronous motors, permanent magnet synchronous motors have much higher efficiency values under light load, with a wide high-efficiency operating range. In the range of 25% to 120%, the efficiency is greater than 90%. The rated efficiency of permanent magnet synchronous motors can meet the Level 1 energy efficiency requirements of the current national standard, which is their biggest advantage in energy saving compared to asynchronous motors. In actual operation, motors rarely run at full power when driving loads. The reasons are: on one hand, designers generally determine motor power based on the extreme operating conditions of the load, but extreme conditions occur rarely. At the same time, to prevent motor burnout under abnormal conditions, designers also leave a power margin for the motor. On the other hand, motor manufacturers usually leave a certain power margin beyond the user's required power to ensure motor reliability. This results in most actually running motors operating below 70% of their rated power, especially when driving fan or pump loads, where motors usually operate in the light load region. For asynchronous motors, light load efficiency is very low, while permanent magnet synchronous motors can still maintain high efficiency in the light load region.

MS-GRAESSNER 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 its relatively poor economic performance indicators, it is manufactured only in low-power ratings. Single-phase resistance-start asynchronous motor. The power ranges from 60 to 370W. Its feature is that no additional phase-splitting components are added; it starts by utilizing 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. The power ranges from 120 to 750W. It is a single-phase motor that starts by increasing the starting torque through an external capacitor. 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, while the auxiliary winding remains idle. Capacitor-start motors have high 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, with the auxiliary winding operating together with the capacitor and the main winding. Therefore, no centrifugal switch is required. Through proper design, an ideal rotating magnetic field is formed during operation, resulting in good motor performance, high efficiency and power factor, and low noise. Its power range is 4 to 250W. Since a single capacitor is used for both starting and running, considering the pros and cons, because the starting time is very short, the capacitor value is selected to meet the needs of long-term operation as much as possible, so a cheaper, smaller-value capacitor is chosen. Consequently, this type of 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 significantly more expensive. These motors offer good starting and running performance. They are suitable for household appliances and small machine tools.

MS-GRAESSNER motor classification

Types of motors: 1. Classification by working power source. According to the different working power sources of motors, they can be divided into DC motors and AC motors. Among them, AC motors are further divided into single-phase motors and three-phase motors. 2. Classification by structure and working principle. Motors can be divided into DC motors, asynchronous motors, and synchronous motors according to their structure and working principle. Synchronous motors can be further divided into permanent magnet synchronous motors, reluctance synchronous motors, and hysteresis synchronous motors. Asynchronous motors can be divided into induction motors and AC commutator motors. Induction motors are further divided into three-phase asynchronous motors, single-phase asynchronous motors, and shaded-pole asynchronous motors. AC commutator motors are further divided into single-phase series-wound motors, AC/DC universal motors, and repulsion motors. DC motors can be divided into brushless DC motors and brushed DC motors according to their structure and working principle. Brushed DC motors can be divided into permanent magnet DC motors and electromagnetic DC motors. Electromagnetic DC motors are further divided into series-wound DC motors, shunt-wound DC motors, separately excited DC motors, and compound-wound DC motors. Permanent magnet DC motors are further divided into rare-earth permanent magnet DC motors, ferrite permanent magnet DC motors, and Alnico permanent magnet DC motors. 3. Classification by starting and running mode. Motors can be divided into capacitor-start single-phase asynchronous motors, capacitor-run single-phase asynchronous motors, capacitor-start-run single-phase asynchronous motors, and split-phase single-phase asynchronous motors according to their starting and running modes. 4. Classification by application. Motors can be divided into drive motors and control motors according to their application. Drive motors are further divided into motors for power tools (including drilling, polishing, grinding, slotting, cutting, reaming, and other tools), motors for home appliances (including washing machines, electric fans, refrigerators, air conditioners, tape recorders, VCRs, DVD players, vacuum cleaners, cameras, hair dryers, electric shavers, etc.), and motors for other general small mechanical equipment (including various small machine tools, small machinery, medical devices, electronic instruments, etc.). Control motors are further divided into stepper motors and servo motors. 5. Classification by rotor structure. Motors can be divided into squirrel-cage induction motors (formerly known as squirrel-cage asynchronous motors in old standards) and wound-rotor induction motors (formerly known as wound-rotor asynchronous motors in old standards) according to their rotor structure. 6. Classification by operating speed. Motors can be divided into high-speed motors, low-speed motors, constant-speed motors, and adjustable-speed motors according to their operating speed. Low-speed motors are further divided into gear reduction motors, electromagnetic reduction motors, torque motors, and claw-pole synchronous motors. Adjustable-speed motors, in addition to being divided into stepped constant-speed motors, stepless constant-speed motors, stepped variable-speed motors, and stepless variable-speed motors, can also be divided into electromagnetic adjustable-speed motors, DC adjustable-speed motors, PWM variable frequency adjustable-speed motors, and switched reluctance adjustable-speed motors. The rotor speed of an asynchronous motor is always slightly lower than the synchronous speed of the rotating magnetic field. The rotor speed of a synchronous motor remains at synchronous speed regardless of the load.

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