SAT motor Germany SAT model SAT price

SAT motors refer to electric motors with a rated voltage above 1000V. Commonly used voltages are 6000V and 10000V; due to differences in foreign power grids, there are also voltage levels of 3300V and 6600V. High-voltage motors emerged because motor power is proportional to the product of voltage and current. Therefore, when the power of low-voltage motors increases to a certain extent (e.g., 300KW/380V), the current is limited by the allowable carrying capacity of the wires, making it difficult to increase further or resulting in excessive costs. It is necessary to increase the voltage to achieve high-power output. The advantages of high-voltage motors are high power and strong shock resistance; the disadvantages are high inertia, making starting and braking difficult.

SAT motor speed control

Motor speed control: In wound-rotor asynchronous motors, additional resistance is connected in series with the rotor to increase the slip rate, causing the motor to operate at a lower speed. The greater the series resistance, the lower the motor speed. This method features simple equipment and convenient control, but the slip power is consumed as heat in the resistor. It belongs to stepped speed control with relatively soft mechanical characteristics. Voltage regulation speed control: When the stator voltage of the motor is changed, a set of different mechanical characteristic curves can be obtained, thereby achieving different speeds. Since the motor torque is proportional to the square of the voltage, the maximum torque drops significantly, resulting in a narrow speed control range, which makes it difficult to apply to general squirrel-cage motors. To expand the speed control range, voltage regulation speed control should use squirrel-cage motors with high rotor resistance, such as torque motors specifically designed for voltage regulation speed control, or connect frequency-sensitive resistors in series with wound-rotor motors. To expand the stable operating range, feedback control should be adopted for speed control ratios above 2:1 to achieve automatic speed regulation. The main device for voltage regulation speed control is a power supply capable of providing variable voltage. Common voltage regulation methods include series saturable reactors, autotransformers, and thyristor voltage regulation, with thyristor voltage regulation being the optimal method. Characteristics of voltage regulation speed control: 1, the voltage regulation circuit is simple and easy to implement automatic control; 2, during voltage regulation, slip power is consumed as heat in the rotor resistance, resulting in low efficiency. 3, voltage regulation speed control is generally suitable for production machinery below 100KW. Electromagnetic speed control: An electromagnetic speed control motor consists of three parts: a squirrel-cage motor, an electromagnetic slip clutch, and a DC excitation power supply (controller). The DC excitation power supply has low power and is usually composed of a single-phase half-wave or full-wave thyristor rectifier. Changing the conduction angle of the thyristor can change the magnitude of the excitation current. The electromagnetic slip clutch consists of three parts: an armature, magnetic poles, and an excitation winding. The armature and the latter have no mechanical connection and can rotate freely. The armature is coaxially connected to the motor rotor, called the driving part, driven by the motor; the magnetic poles are coupled to the load shaft via a coupling, called the driven part. When both the armature and magnetic poles are stationary, if DC current is applied to the excitation winding, several pairs of alternating N and S poles will form along the circumferential surface of the air gap, with magnetic flux passing through the armature. When the armature rotates with the driving motor, relative motion between the armature and magnetic poles induces eddy currents in the armature. These eddy currents interact with the magnetic flux to produce torque, driving the rotor with magnetic poles to rotate in the same direction, but its speed is always lower than the armature speed N1. This is a slip speed control method. By varying the DC excitation current of the slip clutch, the output torque and speed of the clutch can be changed. Characteristics of electromagnetic speed control motors: 1, simple device structure and control circuit, reliable operation, and convenient maintenance; 2, smooth speed control, stepless speed regulation; 3, no harmonic impact on the power grid; 4, large speed loss and low efficiency. 5, this method is suitable for medium and small power production machinery requiring smooth operation and short-term low-speed operation.

SAT motor maintenance

Motor maintenance: 1, before use, confirm whether the appearance of the low-speed motor is damaged and whether there is any oil leakage. 2, please first confirm whether the purchased low-speed motor specifications match the design. 3, if using accessories such as sprockets, pulleys, or speed reducers, install them according to relevant standards. 4, lubricating grease is already filled in the low-speed motor body, and lubricating oil does not need to be replaced for 16000 hours. 5, during the transmission operation of the low-speed motor, ensure that the current does not exceed the value indicated on the motor nameplate. 6, please pay attention to ambient temperature, humidity, acidity, and alkalinity. 7, the applicable environment is -5℃ to 40℃, humidity below 85%, and indoor altitude below 1000 meters. 8, incorrect installation, maintenance, or operation may cause serious damage to the low-speed motor. 9, when repairing or disassembling, strictly confirm that the external power supply to the motor is completely disconnected. 10, safety protection devices must be properly installed to ensure absolute operational safety. 11, the motor must be grounded; please refer to relevant power distribution regulations. 12, confirm that the motor is installed correctly before starting the low-speed motor. 13, if the low-speed motor is used with a frequency converter for low-speed transmission, an independent auxiliary cooling fan must be added. 14, after a single-phase low-speed motor is powered off, some charge remains in its capacitor; please discharge it first or ground the terminals. 15, for vertical motor installation, please specify in advance when ordering or contact our company.

SAT motor starting methods

Motor starting methods: First, split-phase starting, which uses an auxiliary starting winding to assist starting. Its starting torque is not high. The operating speed remains roughly constant. It is mainly applied to motors for electric fans, air conditioner fans, washing machines, etc. Second, when the motor is stationary, the centrifugal switch is closed. Upon powering on, the starting capacitor participates in the starting process. When the rotor speed reaches 70% to 80% of the rated value, the centrifugal switch automatically opens, the starting capacitor completes its task and is disconnected. The starting winding does not participate in operation, and the motor continues to operate via the running winding coil. Third, when the motor is stationary, the centrifugal switch is closed. Upon powering on, the starting capacitor participates in the starting process. When the rotor speed reaches 70% to 80% of the rated value, the centrifugal switch automatically opens, the starting capacitor completes its task and is disconnected. The running capacitor is connected in series with the starting winding to participate in operation. This connection is generally used in places with heavy and unstable loads, such as air compressors, cutting machines, and woodworking machine tools, as shown in Figure C. For motors with centrifugal switches, if the motor cannot start successfully within a very short time, the winding coils will burn out quickly. Capacitance values: Dual-value capacitor motors have large starting capacitance and small running capacitance, with a voltage rating generally greater than 400 V. Forward and reverse control: Usually, the resistance values of the starting winding and running winding of this type of motor are the same, meaning the wire diameter and number of turns are identical. This type of motor is generally used in washing machines. This forward and reverse control method is simple and does not require complex changeover switches. For forward and reverse control, simply swap lines 1 to 2 or swap lines 3 to 4 to achieve reversal. Identification of starting and running windings: Usually, the DC resistance of the starting winding is much larger than that of the running winding, which can be measured with a multimeter. Generally, the DC resistance of the running winding is a few ohms, while the DC resistance of the starting winding is tens to hundreds of ohms.

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