Voltage, frequency, and phase-difference angle control of PWM inverters-fed two-phase induction motors

1994 ◽  
Vol 9 (4) ◽  
pp. 377-383 ◽  
Author(s):  
Do-Hyun Jang
Keyword(s):  
Phase Difference ◽  
Induction Motors ◽  
Two Phase ◽  
Voltage Frequency

scholarly journals Complex Electronic Protection for Low-voltage Three-phase Induction Motors

2020 ◽  
Vol 11 ◽  
pp. 11-17
Author(s):  
Gabriel Nicolae Popa ◽  
Corina Maria Diniș
Keyword(s):  
Induction Motors ◽  
Low Voltage ◽  
Short Circuit ◽  
Electronic Devices ◽  
General Purpose ◽  
Two Phase ◽  
Dc Voltage ◽  
Electric Drives ◽  
Normal Limits ◽  
Three Phase

Low-voltage three-phase induction motors are most often used in industrial electric drives. Electric motors must be protected by electric and/or electronic devices against: short-circuit, overloads, asymmetrical currents, two-phase voltage operation, under-voltage, and over-temperature. To design the electronic protection currents, voltages and temperature must be measured to determine whether they fall within normal limits. The electronic protection was design into low capacity PLC. The paper presents the designs and analysis of complex electronic protection for general purpose low-voltage three-phase induction motors. The electronic protection has Hall transducers and conversion electronic devices for AC currents to DC voltages, AC voltages to DC voltage, temperature to DC voltage, a low capacity PLC, switches, motor’s power contactors, and signalling lamps has been developed. Experiments with complex electronic protection, for different faults are presented. The proposed protection has the advantages of incorporating all usual protections future for the low-voltage three-phase induction motors.

Harmonic torques in two-phase induction motors using six-step drives

1984 ◽  
Vol 54 (10) ◽  
pp. 411
Author(s):  
P. Atkinson ◽  
P.R. Savage
Keyword(s):  
Induction Motors ◽  
Two Phase

The Self-Synchronization Theory of a Vibrating System by Two-Motor Driven with Isolation Frame

2014 ◽  
Vol 602-605 ◽  
pp. 1490-1494 ◽  
Author(s):  
Duo Yang
Keyword(s):  
Small Parameter ◽  
Phase Difference ◽  
Induction Motors ◽  
The Self ◽  
Structure Parameters ◽  
Rotating Speed ◽  
Vibrating System ◽  
The 1960S ◽  
Synchronization Theory

The idea of self-synchronization vibrating system comes from the phenomenon of synchronization. In the 1960s, Blekhman[1,2] proposed the self-synchronization theory of vibrating system driven by two induction motors. When the structure parameters of the two motors met the requirements, the system could operate synchronously. Blekhman[3] also found that even if the rotating speed and the angular phase difference of the two eccentric rotors were being disturbed or one of the motors was powered off, the system could still operate synchronously. The small parameter methods were applied to a number of problems by R.F. Nagaev[4]. It can lead to better understanding of the self-synchronization theory. Wen Bang-chun[5] applied self-synchronization theory to engineering and established a branch of the vibration utilization engineering, and numerous self-synchronous vibrating machines were invented.

scholarly journals 5G Millimeter-Wave Beamforming System using Substrate Integrated Waveguide

F1000Research ◽  
2021 ◽  
Vol 10 ◽  
pp. 1311
Author(s):  
Noorlindawaty Md Jizat ◽  
Zubaida Yusoff ◽  
Arevinthran A/L Nallasamy ◽  
Yoshihide Yamada
Keyword(s):  
Phase Difference ◽  
Return Loss ◽  
Phase Shifter ◽  
Transmission Efficiency ◽  
Phase Shifters ◽  
Substrate Integrated Waveguide ◽  
Two Phase ◽  
Transmission Amplitude ◽  
Wireless Signal ◽  
Hybrid Coupler

Beamforming is a key element of 5G that uses advanced antenna technologies to focus a wireless signal to a defined direction. Butler Matrix (BM) as a beamforming network is used to control the beam direction by utilizing the amplitude and the output phase. A particular technique for designing BM is through substrate integrated waveguide (SIW), which is used to realize the bilateral edge wall vias where the waveguide mode propagates through to support the current flow and reduce the loss of surface wave. Unlike conventional BM, the proposed design requires only hybrid couplers and phase shifter without any crossover. In this BM structure, the SIW hybrid coupler is designed, with two phase shifters of -90°, and one phase shifter of -180° to control the amplitude and phase shifting. This results in an optimized transmission amplitude and output phase difference. The BM also circumvents any crossover, to provide minimal losses. The hybrid coupler exhibits Sii and Sij characteristics at 28 GHz, with values of -27.35 dB for return loss, -3.9 dB for insertion loss, -3.2 dB for coupling, and -26.54 dB for the isolation. In the BM design, high transmission efficiency is observed where the return loss is less than -10 dB, while minimal transmission amplitudes are obtained within the values of ‒6 ± 3 dB. The three-port BM is designed using SIW with minimal loss and the phase difference at each respective output port of the BM shows values of 0°, -120°, and 120°. The three consecutive beams with the gains of 11.1 dBi for port 1 excitation, 9.06 dBi for port 2 excitation and 10.4 dBi for port 3 excitation is achieved when the antenna array is fed to the BM, and each of the radiated beams has beam angles of 0, -27 and 27 degrees.

scholarly journals A Method to Calculate Performance and Circuit Parameters of Linear Induction Motors Using Simple Two-Phase Model

2015 ◽  
Vol 4 (4) ◽  
pp. 409-417
Author(s):  
Hideaki Hirahara ◽  
Shu Yamamoto ◽  
Takahiro Ara ◽  
Toshihisa Shimizu
Keyword(s):  
Induction Motors ◽  
Phase Model ◽  
Two Phase ◽  
Linear Induction ◽  
Linear Induction Motors
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