IMT motor Germany IMT model IMT price

IMT 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.

IMT motor speed control

Motor speed control: For wound-rotor asynchronous motors, additional resistance is inserted in series into the rotor circuit, increasing the motor's slip and causing the motor to operate at a lower speed. The greater the inserted resistance, the lower the motor speed. This method features simple equipment and convenient control, but the slip power is consumed as heat in the resistors. It belongs to stepped speed control, and the mechanical characteristics are relatively soft. Voltage regulation speed control: When changing the stator voltage of the motor, 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 small speed control range, making 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, when speed control is above 2:1, feedback control should be adopted to achieve automatic speed regulation. The main device for voltage regulation speed control is a power supply capable of providing voltage variation. Common voltage regulation methods include series-connected saturated reactors, autotransformers, and thyristor voltage regulation, among others. Thyristor voltage regulation is the best. Characteristics of voltage regulation speed control: 1. The voltage regulation speed control 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 has low power, typically 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 circumference of the air gap surface, and their magnetic flux passes through the armature. When the armature rotates with the driving motor, due to the relative motion between the armature and the magnetic poles, eddy currents are induced 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. Speed control characteristics of electromagnetic speed control motors: 1. Simple device structure and control circuit, reliable operation, and convenient maintenance; 2. Smooth speed control, stepless speed control; 3. No harmonic impact on the power grid; 4. Large speed loss, low efficiency. 5. This method is suitable for production machinery with medium and small power, requiring smooth operation and short-term low-speed operation.

IMT motor precautions

Motor precautions: 1. Before disassembly, use compressed air to blow off dust from the motor surface and wipe the surface dirt clean. 2. Select a work location for motor disassembly and clean the site environment. 3. Familiarize yourself with the structural features of the motor and maintenance technical requirements. 4. Prepare the tools (including special tools) and equipment required for disassembly. 5. To further understand defects during motor operation, if conditions permit, perform an inspection test before disassembly. For this purpose, run the motor with load, carefully check the temperature, sound, vibration, and other conditions of each part of the motor, and test voltage, current, speed, etc. Then disconnect the load and perform a no-load inspection test separately, measure the no-load current and no-load loss, and keep records. 6. Cut off the power supply, remove the external wiring of the motor, and keep records. 7. Use a megohmmeter with appropriate voltage to test the motor insulation resistance. To compare with the insulation resistance value measured during the previous maintenance to judge the trend of motor insulation changes and insulation status, the insulation resistance values measured at different temperatures should be converted to the same temperature, generally converted to 75℃. 8. Test the absorption ratio K. When the absorption ratio is greater than 1.33, it indicates that the motor insulation has not been dampened or the dampness is not severe. To compare with previous data, the absorption ratio measured at any temperature must also be converted to the same temperature.

IMT motor phase angle and torque

The motor phase difference angle (torque angle) is the phase difference δ between the no-load induced electromotive force generated by the magnetic field and the armature voltage. The torque of a synchronous motor is proportional to sin (δ) and reaches the theoretical xxx torque at δ = 90 degrees (for cylindrical motors; it differs for salient-pole motors). In addition, since the motor rotates synchronously with the frequency of the armature voltage, the output is proportional to the torque. If the load torque is too large, it will stop due to "out of sync (pull-out)". The torque at this time is called "pull-out torque", and it serves as the phase difference angle within the range of 50-70 degrees.

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