Unitec motor Germany Unitec model Unitec price

Unitec motor refers to an electromagnetic device that realizes the conversion or transmission of electrical energy based on the law of electromagnetic induction. It generally refers to all machines that can convert mechanical energy into electrical energy and electrical energy into mechanical energy. The motor housing protection rating is IP44, and the cooling method is IC0141 totally enclosed fan-cooled (TEFC). The ambient air temperature varies with the seasons but does not exceed 15℃ to 40℃. The altitude does not exceed 1000m. Refer to the nameplate for rated frequency, rated voltage, insulation class, and duty cycle. When the power supply voltage varies within ±0.05 of the rated value (frequency at rated value), the motor output power maintains the rated value.

Unitec motor hot topics

Motor torque characteristics: To improve the torque characteristics of motors, many scholars and research institutions have made bold attempts and innovations in the structural design of permanent magnet synchronous motors (PMSMs), achieving many new advances. To resolve the conflict between slot width and tooth width, transverse flux machine technology was developed, where the armature coils and slot structure are spatially perpendicular, and the main magnetic flux flows along the axial direction of the motor, thereby increasing the power density of the motor; a double-layer permanent magnet arrangement is adopted to increase the quadrature-axis conductance of the motor, thus increasing the output torque and maximum power of the motor; the stator tooth shape and pole shape are changed to reduce torque ripple of the motor, etc. Field-weakening speed expansion capability: After adopting field-weakening control, the operating characteristics of permanent magnet synchronous motors are more suitable for the drive requirements of electric vehicles. Under the same power requirements, the inverter capacity is reduced, and the efficiency of the drive system is improved. Therefore, field-weakening speed expansion is commonly used in permanent magnet synchronous motors for electric vehicle drives. For this purpose, research institutions at home and abroad have proposed various solutions, such as adopting a double stator structure, using different windings at different speeds to maximize the utilization of the permanent magnet field; adopting a composite rotor structure, adding reluctance sections to the rotor to control the direct-axis and quadrature-axis reactance parameters of the motor, thereby increasing the speed expansion capability of the motor; and using deep slots in the stator to increase direct-axis leakage reactance to expand the speed range of the motor. Motor control theory: Due to the nonlinearity and multivariable nature of permanent magnet synchronous motors, control is difficult and control algorithms are complex; traditional vector control methods often fail to meet the requirements. Therefore, some advanced control methods have been applied in PMSM speed regulation systems, including adaptive observers, model reference adaptive control, high-frequency signal injection, and intelligent control methods such as fuzzy control and genetic algorithms. These control methods do not rely on the mathematical model of the controlled object, offer good adaptability and robustness, and have unique advantages for highly nonlinear systems such as permanent magnet synchronous motors.

Unitec motor maintenance methods

Motor armature disassembly: Observe whether sparks are generated between the carbon brushes and the commutator during motor operation, and the degree of sparking. (1) indicates no sparks at all, meaning the carbon brushes and commutator are normal and no repair is needed; (2) indicates only 2 to 4 very small sparks. At this time, carefully observe if the commutator surface is flat. In most cases, repair is not necessary; (3) indicates that besides r having 4 or more very small sparks with F, there are also 1 to 3 large sparks. In this case, it is not necessary to disassemble the armature; simply sand the carbon brushes and commutator with sandpaper; (4) If 4 or more large sparks appear, the commutator needs to be sanded with sandpaper, or even carefully turned on a lathe. At this time, the carbon brushes and armature must be disassembled. Of course, once the commutator is machined, the carbon brushes must be replaced and bedded in. Disassembly method: Because vibration can damage the carbon brushes when disassembling the end covers and armature, the carbon brushes should first be removed from the brush holders. Also, since the angles of the two brush holders relative to the commutator may not be the same, to ensure restoration to the original state during installation and prevent left and right carbon brushes from being installed incorrectly, marks must be made on the left and right carbon brushes before removal. Additionally, take care not to damage the contact surfaces between the carbon brushes and the commutator. One end of a high-speed motor generally has a cooling fan, and the other end may have a magnet or tachometer ring for speed measurement. When disassembling the cooling fan blades, magnet, or tachometer ring, exercise extreme caution to avoid damaging the fan blades or the speed-measuring magnet. Next, make a mark between the fan hub or magnet hub and the shaft so that they can be installed at the original marked positions after repair. Since the dynamic balance test of high-speed motors is performed with the fan blades or tachometer ring (speed-measuring magnet) attached, assembly must follow the marks made during disassembly. This is a minor matter in general motor repair, but I it is critical in high-speed motor repair. Because once the tachometer ring or fan blades are damaged, or if they are not assembled according to the marks, even if other parts are repaired well, imbalance vibration of the entire machine may occur during high-speed operation after assembly. Do not use hammers, punches, or other hard striking or prying tools when disassembling high-speed motors; use a puller. When using a puller, note that the tip of the puller should press directly against the center hole, and a protective pad should be placed between the puller tip and the center hole to protect the center hole on the armature shaft from damage. Make marks on the upper and lower end covers before disassembly to facilitate reassembly in the original configuration after repair. Clean the bearings on the armature with care during disassembly. Use clean aviation gasoline for cleaning. After the gasoline dries, fill the bearing housing with 7014 (or 7018) bearing grease (ordinary butter or molybdenum disulfide cannot be used for high-speed motor bearings). Place in a clean area for later use. If the commutator surface is flat and has a purple luster, this oxide layer protects the commutator surface; simply remove the surface powder with a soft brush.

Unitec motor classification

A single-layer winding in a motor is a winding where only one effective side of a coil is placed in each stator slot, so the total number of coils is only half the total number of slots in the motor. The advantages of single-layer windings are fewer winding coils, simpler craftsmanship; higher slot utilization due to the absence of inter-layer insulation; and no phase-to-phase breakdown faults in the single-layer structure. The disadvantages are that the electromagnetic waveform generated by the winding is not ideal, resulting in higher iron losses and noise in the motor, and slightly poorer starting performance; therefore, single-layer windings are generally only used in small-capacity asynchronous motors. Single-layer windings can be divided into several forms such as chain windings, cross-chain windings, concentric windings, and cross-concentric windings, depending on the shape of the coils and the arrangement of the end connections. Chain windings are composed of single-layer coil elements with identical shapes and widths, named because the end parts of the winding coils resemble linked chains. Special attention should be paid to single-layer chain windings: the coil pitch must be an odd number, otherwise the winding cannot be arranged. Cross-chain windings: When the number of slots per pole per phase 9 is an odd number greater than 2, chain windings cannot be arranged, and cross windings with single and double coils must be used. In concentric windings, all coils within the same pole-phase group surround the same center. When the number of slots per pole per phase Q is an even number greater than 2, concentric windings can be adopted. The advantages of single-layer concentric and cross-concentric windings are simpler winding and embedding processes, while the disadvantage is excessively long coil ends, consuming too much wire. Apart from occasional use in small-capacity 2-pole and 4-pole motors, this winding form is rarely used today.

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