Induction-motor speed-changing by pole-amplitude modulation

Rawcliffe, G.H.; Burbidge, R.F.; Fong, W.

doi:10.1049/pi-a.1958.0076

Cited by 53 publications

(4 citation statements)

References 1 publication

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“…So we started experiments to see whether the circuitry of the Dahlander winding, which as I have shown you is very simple, could be used to switch from one pole-number to another, for various other pole-combinations. After some time a satisfactory winding was evolved, but only for 8/10 poles (Rawcliffe, Burbidge & Fong 1958) and a few other pole-combinations, such as 14/16 poles, where neither pole-number was a multiple of 3. Around this mainly ad hoc development, the general equations for pole-amplitude modulation were later form ulated.f (See appendix 2.)…”

Section: (A) General Requirementsmentioning

confidence: 99%

The Clifford Paterson Lecture, 1977 Induction motors: old and new

Rawcliffe

1978

Proc. R. Soc. Lond. A

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On the delivery of a recently founded named lecture, it is the duty and the pleasure of the lecturer to say something of the man whom it commemorates. Clifford Paterson was born in 1879 and died in 1948. He was thus over thirty years my senior, but I do remember clearly his Faraday Lecture for the Institution of Electrical Engineers on ‘The free electron’. He was well known as an excellent lecturer, particularly when the lecture was accompanied by demonstrations. He was a pioneer of industrial research, and his major work was done from 1919 onwards, when he created, virtually from scratch, the Research Laboratories of the General Electric Company at Wembley. His personal scientific interests were in gas discharges, photometry and illumination. Around these, the Laboratories were established; but, in the war years, they turned to radar and other projects in radio and electronics, which could be handled because of the staff and facilities which Paterson had built up. He was elected F.R.S. in 1942. My own special interests lie in rotating electrical machinery, and are a long way from Paterson’s fields of activity. Nevertheless I have one claim to kinship with him, and I share certain opinions which he expressed in his own account of the G. E. C. Laboratories. Like Paterson, I also was trained as an electrical engineer, rather than as a scientific research worker, and I agree with his opinion that early industrial experience often proves beneficial to those who in later years engage in engineering research. Further, Paterson attached great importance to character, as well as to intellect, in leading to effective research work. I was once invited to tell a committee what teaching methods I used. I replied that I taught by influence and example, which are not expressible as a method, and left it at that. Those who have followed him have told me that Paterson was, above all, an influence and an example and, in this way, I try to follow the same kind of path as Paterson... So now to my theme.

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Section: (A) General Requirementsmentioning

confidence: 99%

The Clifford Paterson Lecture, 1977 Induction motors: old and new

Rawcliffe

1978

Proc. R. Soc. Lond. A

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“…The stator poles cannot change at running, but the pole amplitude modulation technique can change speed ratios. The speed control of the wound rotor motor is improved to use the slip power by the Scherbius system [6].…”

Section: Introductionmentioning

confidence: 99%

FPGA‐based control strategy of five‐phase induction motor drives

Kulandaivel¹,

Sundaram²,

Padmanaban

et al. 2022

The Journal of Engineering

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Here, a novel control technique for Five‐Phase Induction Motor (FPIM) drives using a field‐programmable gate array (FPGA) controller is proposed. Open‐loop control is analysed in terms of the performance and measurement of various power quality factors, such as voltage harmonics, current harmonics, total harmonic distortion, crest factor, unbalanced, short and long‐term flickering, K‐factor, real power, reactive power, apparent power, and power factor. This study experimentally demonstrated a closed‐loop system with both PID and DTC controls for the FPIM. Diminished torque pulsation is obtained by efficiently utilizing the voltage vectors from the total states of 25 = 32. A novel EG voltage vector sequence was proposed for DTC techniques and compared with small, medium, and large voltage vector sequences. Proposed innovative control programming techniques in spartan‐6 XC6SLX25 series FPGA for switching the five‐phase two‐level inverter to reduce the total harmonics distortion by less than 2%.

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“…The three speed-changing methods achieve high torques at low speeds, and the speed range also increased [19][20][21][22][23]. In all three methods, stator winding resistances were improved after changing the speeds by changing the stator winding structure to change the speed [24][25][26][27]. Copper loss accounts for the largest proportion of motor losses, and an improvement of resistance improves the efficiency characteristics and broadens the high efficiency area.…”

mentioning

confidence: 97%

A Study on The Electromagnetic Multi-Step Transmission Characteristics of Interior Permanent Magnet Synchronous Motors

et al. 2022

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In this paper, electromagnetic multi-step transmissions are introduced as a method for increasing the torque and efficiency of electric vehicle driving motors. Motors using permanent magnets have a limited ability in increasing the speed as the back electromotive force increases as the speed increases. The electric vehicle driving motor performs field-weakening controls to increase the speed after the rated point. Field-weakening control increases the rotor’s speed by weakening the magnetic flux of the field. At this time, the output is constant as the speed increases. Motors have voltage limits, which also affect the maximum speed of the motor. In order to improve these constraints, there is a case study of electromagnetic shifting phenomena. Examples of the research include the wye-delta method and the method of changing the number of equivalent serial turns. As in the case of previous studies, the problem of increasing back electromotive forces as the speed increases is solved. In this paper, we propose a method to increase the maximum speed by changing the number of parallel paths. In order to lower the back electromotive force at high speeds, the number of parallel paths of the stator windings changed via the thyristor. As the number of stator parallel paths increases, the back electromotive force decreases. When the back electromotive force is lowered, the torque that can be output is reduced, but the maximum speed can increase as the voltage is also lowered. Before shifting, the number of parallel paths is set to two to satisfy high torque at low speeds. After shifting, the maximum speed can be increased to 4 with the number of parallel paths, which can broaden the operating range of the motor. In addition, the resistance of the stator windings is reduced by increasing the number of parallel paths in the high-speed region. The loss that accounts for the largest proportion of the electromagnetic loss of the motor is copper loss, and by reducing it, the efficiency increased. As a result, it increases the operating area and simultaneously increases the high-efficiency area. In order to analyze the electromagnetic characteristic, a finite-element-method-based simulation was used.

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Induction-motor speed-changing by pole-amplitude modulation

Cited by 53 publications

References 1 publication

The Clifford Paterson Lecture, 1977 Induction motors: old and new

The Clifford Paterson Lecture, 1977 Induction motors: old and new

FPGA‐based control strategy of five‐phase induction motor drives

A Study on The Electromagnetic Multi-Step Transmission Characteristics of Interior Permanent Magnet Synchronous Motors

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