SCHORCH motor Germany SCHORCH model SCHORCH price

SCHORCH motor refers to a motor that, under standard environmental conditions, operates continuously at 100% rated load within the 10%~100% rated speed range, with temperature rise not exceeding the motor's specified allowable value. When the slip variation of an asynchronous motor is small, the speed is proportional to the frequency; thus, changing the power supply frequency changes the speed of the asynchronous motor. During variable frequency speed control, it is always desired to keep the main magnetic flux constant. If the main magnetic flux is greater than the flux during normal operation, the magnetic circuit becomes oversaturated, causing an increase in excitation current and a decrease in power factor; if the main magnetic flux is less than the flux during normal operation, the motor torque decreases.

SCHORCH motor applications

A motor refers to an asynchronous motor powered by a 220V AC single-phase power supply. Because 220V power supply is very convenient and economical, and household electricity is also 220V, single-phase motors are not only widely used in production but are also closely related to people's daily lives. Especially with the continuous improvement of living standards, the usage of single-phase motors in household appliances is increasing. Production applications include micro water pumps, grinding machines, threshers, crushers, woodworking machinery, and medical devices. In daily life, applications include electric fans, hair dryers, exhaust fans, washing machines, and refrigerators. There are many types, but the power is relatively low. This type of motor usually has two-phase windings on the stator, and the rotor is a standard squirrel-cage type. Different distributions of the two-phase windings on the stator and different power supply conditions can produce different starting and operating characteristics.

SCHORCH motor classification

The motor drive current is purely AC; brushless DC motors can be divided into brushless speed motors and brushless torque motors. Generally, there are two types of drive currents for brushless motors: one is trapezoidal wave (usually "square wave"), and the other is sine wave. Sometimes the former is called a DC brushless motor, and the latter is called an AC servo motor, which is strictly speaking a type of AC servo motor. To reduce the moment of inertia, brushless DC motors usually adopt a "slender" structure. Brushless DC motors are much smaller in weight and volume than brushed DC motors, and the corresponding moment of inertia can be reduced by about 40%—50%. Due to processing issues with permanent magnet materials, the general capacity of brushless DC motors is below 100kW. This type of motor has good linearity in mechanical and adjustment characteristics, a wide speed regulation range, long life, convenient maintenance, and low noise, without the series of problems caused by brushes, so this type of motor has great application potential in control systems. The stator windings of the motor are mostly made into a three-phase symmetrical star connection, very similar to three-phase asynchronous motors. Permanent magnets that have been magnetized are attached to the rotor of the motor. To detect the polarity of the motor rotor, position sensors are installed inside the motor. The driver consists of power electronic devices and integrated circuits, etc., with the following functions: receiving start, stop, and brake signals of the motor to control the start, stop, and braking of the motor; receiving position sensor signals and forward/reverse signals to control the on/off of each power tube in the inverter bridge to generate continuous torque; receiving speed commands and speed feedback signals to control and adjust the speed; providing protection and display, etc. Since brushless DC motors operate in a self-controlled manner, they do not require additional starting windings on the rotor like synchronous motors under heavy-load start with variable frequency speed control, nor do they produce oscillation and step-out when the load changes suddenly. For small and medium-capacity brushless DC motors, the permanent magnets mostly use high magnetic energy product rare earth Nd-Fe-B (Nd-Fe-B) materials. Therefore, the volume of rare earth permanent magnet brushless motors is reduced by one frame size compared to three-phase asynchronous motors of the same capacity. Over the past thirty years, research on variable frequency speed control of asynchronous motors has ultimately been seeking methods to control the torque of asynchronous motors. Rare earth permanent magnet brushless DC motors will surely show advantages in the field of speed regulation due to their wide speed regulation, small volume, high efficiency, and small steady-state speed error. Because brushless DC motors have the characteristics of DC brushed motors and are also frequency-changing devices, they are also known as DC variable frequency, with the international generic term being BLDC. The operating efficiency, low-speed torque, and speed precision of brushless DC motors are better than any variable frequency drive with control technology, so they deserve industry attention. This product has been produced for over 55kW, can be designed up to 400kW, and can meet the needs of the industry for energy saving and high-performance drive.

SCHORCH motor structure

Motor rotor structure: The rotor is the rotating part of a three-phase asynchronous motor, consisting of the rotor core, rotor winding, shaft, fan, and other parts. The rotor core is also part of the motor's magnetic circuit, made of laminated silicon steel sheets with uniform linear slots punched on the outer circumference, and fixed on the shaft. The rotor winding is placed in the linear slots of the rotor core. According to the different structures of the rotor winding, three-phase asynchronous motors can be divided into squirrel-cage type and wound-rotor type. The rotor winding of a squirrel-cage asynchronous motor is named for its shape resembling a squirrel cage; its structure consists of copper bars embedded in the slots as conductors, with the two ends of the copper bars welded together with short-circuit rings. Small and medium-sized squirrel-cage asynchronous motors use cheaper aluminum instead of copper, casting the rotor conductors, short-circuit rings, and fans into one unit, becoming a cast-aluminum squirrel-cage rotor. The core of a wound-rotor is the same as that of a squirrel-cage rotor. The rotor winding is similar to the stator winding, made of insulated wire wound according to a certain rule and embedded in the rotor slots to form a three-phase symmetrical winding. Usually, the ends of the three windings are connected together, and the heads are respectively connected to three mutually insulated copper slip rings fixed on the shaft, connected in a star configuration. The rotor winding is connected to an external three-phase rheostat through the slip rings and brushes on them, for motor starting and speed regulation within a small range. The working principles of squirrel-cage and wound-rotor three-phase asynchronous motors are the same; the difference lies only in the structure of the rotor winding.

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