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Motors and Drives
Published in Muhammad E. Fayed, Thomas S. Skocir, Mechanical Conveyors, 2018
Muhammad E. Fayed, Thomas S. Skocir
Three-phase motors require three-phase current and are used in applications where large horspowers are required. High-voltage, three-phase current is commonly supplied to industrial sites. Each phase is carried on a separate conductor. All three phases carry alternating current of the same frequency and voltage. The frequency of the three phases are time displaced 120° apart.
Screening of Constructional Parts
Published in Janusz Turowski, Marek Turowski, Engineering Electrodynamics, 2017
Janusz Turowski, Marek Turowski
Utilizing the method presented above, Zarebski [4.33] calculated eddy currents induced inside all three screens, when the current +I flows in the bar of phase L1 and the current −I flows in the bar of phase L2. A three-phase current can therefore be simulated by two such pairs of currents, shifted in time by 120°.
Fan, Pump, Drive, Motor, and Electrical Terminology
Published in Samuel C. Sugarman, Testing and Balancing HVAC Air and Water Systems, 2020
A motor supplied with three-phase current. For the same size, three-phase motors have a capacity of about 150% greater, are lower in first cost, require less maintenance and generally do better than single-phase motors.
Fault-tolerant operation of the cascaded H-bridge three-level inverter for electric vehicle application
Published in International Journal of Ambient Energy, 2023
Paramjeet Singh Jamwal, Sanjeev Singh, Shailendra Jain
Switching signals for the S1 switch of H-bridges (HB-A, HB-B, HB-C and HB-R) during phase-a H-bridge fault, are shown in Figure 16(a), for switches S1a, S1b, S1c and S1r, respectively. As the fault occurred in the phase-a H-bridge, the switching signal transferred from the S1a switch to the S1r switch. The status of H-bridges (HB-A, HB-B and HB-C) is shown in Figure 16(b), with SHB-A, SHB-B and SHB-C, respectively. The high value of SHB-A reflects the faulty condition of the phase-a H-bridge. The current supplied by H-bridges (HB-A, HB-B, HB-C and HB-R) is shown in Figure 16(c), with IHB-A, IHB-B, IHB-C and IHB-R, respectively. As the fault occurred in phase-a H-bridge, the phase-a current is supplied by an additional H-bridge. The three-phase voltage supplied by the cascaded H-bridge three-level inverter and the speed of the induction motor is shown in Figure 16(d), with Vabc and W, respectively. The three-phase current and torque of the induction motor are shown in Figure 16(e), with Iabc and T, respectively. Due to the effectiveness of phase fault-detection and fault-removal technique, the three-phase voltage and current supplied to the induction motor remain uninterrupted and the motor can maintain its speed and torque even during a fault in the phase-a H-bridge.
Multi-objective optimization of milling process: exploring trade-off among energy consumption, time consumption and surface roughness
Published in International Journal of Computer Integrated Manufacturing, 2023
Jiahao Yang, Yingfeng Zhang, Yun Huang, Jingxiang Lv, Kai Wang
Generally, frequency converters are installed in the spindle system and the feed system of CNC machine tools to adjust the speed of the two systems by changing the voltage and current frequency (Abele, Altintas, and Brecher 2010). The input current frequency range of the inverter is very wide, which is beyond the power frequency measurement range. And the three-phase current is often unbalanced and contains many harmonic components. However, the ordinary simple power meter is merely suitable for measuring the electric power close to the power frequency and difficult to accurately measure the electric power of the CNC machine tool with frequency conversion (Blaabjerg et al. 1997). In order to collect the energy consumed by CNC machine tool in the milling process, the authors designed a kind of energy consumption data acquisition device composed of a high-precision, high-frequency response current and voltage sensor and a high-precision, high-frequency data acquisition card, to accurately collect energy consumption data of CNC machine tool.
Implementation of Space Vector Modulated Single-phase to Three-phase Indirect Matrix Converter for Induction Motor Drive Control
Published in IETE Journal of Research, 2022
Manoj A. Waghmare, B. S. Umre, M. V. Aware, Anup Kumar
All the experiment-based results of the developed 1 × 3 IMC prototype are shown in Figure 9. By proper switching of power semiconductor switches 1 × 3 IMC is able to maintain UPF at the supply side, as shown in Figure 9(a). Percentage THD of supply current is shown in Figure 9(b). The nature of voltage across virtual DC-link is shown in Figure 9(c). Three-phase output line voltage and its FFT analysis are shown in Figure 9(d) and 9(e), respectively. Three-phase current drawn by the induction motor is shown in Figure 9(f). The THD analysis of the current drawn by stator of three-phase induction motor is shown in Figure 9(g). From the presented laboratory prototype results, it is observed that by the proper selection of source side filters and with proper switching algorithm UPF can be maintained between source voltage and source current. The FFT spectrum of output line voltage with the operating frequency of 50 Hz shows that at the multiples of the converter switching frequency there are large harmonic components that appear as sidebands. Output load current is perfectly sinusoidal and confirms three-phase balance operation of single-phase to three-phase IMC. Experimental results for 1 × 3 IMC, (a) Source Voltage Vs and Source current is (CH1 = 50 V/Div., CH2 = 2A/Div.), (b) FFT analysis of source current (c) Virtual DC-link voltage (Vdc), (d) Three-phase output line voltage (e) FFT analysis of output line voltage, (f) Three-phase output line current, (g) FFT analysis of output line current