公开(公告)号：EP0193708A3

公开(公告)日：1987-04-08

申请号：EP86100354

申请日：1986-01-13

Applicant: KOLLMORGEN TECHNOLOGIES CORPORATION

Inventor： Byrne, John V. ,  O'Dwyer, Jeremiah B.

IPC: H02K01/06 ,  H02K19/06

CPC classification number: H02K1/246 ,  H02K19/103 ,  H02P1/163

Abstract: in a two-phase salient pole variable reluctance motor in which the number of stator poles (24-27) is four or a multiple of four, alternate stator poles carry windings (31-34) of different phases and each stator pole (24-27) has an elongated pole shoe (53), so that the pole tips (28, 29) of each adjacent pair of stator poles are at a relatively short circumferential spacing. Each rotor pole (35, 36) has an iron depletion layer (37) in the vicinity of its poleface surface (38) which defines a saturating zone, across which the greater part of the magnetomotive force produced by energisation of the stator windings is developed due to the uniform build-up of flux with rotor angle throughout almost the entire duration of pole overlap. A working stroke approximating to stator pole pitch is achieved. The circumferential extent of each rotor pole (35, 36) is matched to that of the stator poles (24-27) so that when the rotor poles are fully aligned with a pair of stator poles, each rotor poletip (41, 42) is located in the vicinity of a pair of spaced apart stator pole tips (28, 29), the relative disposition of the pole tips being such that when both phases of the motor are then simultaneously excited, fringing flux passes through the rotor poletips (41, 42), this flux being relatively strong for one poletip of each rotor pole and relatively weak for the other poletip. When the rotor poles are initially positioned so that there is partial overlap between rotor and stator poles, the motor is started by a conventional reluctance motor phase energisation sequence, but when the rotor poles are initially fully aligned with a pair of stator poles, in which position neither phase acting alone is capable of producing torque, both phases are excited simultaneously, so that torque is applied to the rotor by the flux asymmetry prevailing in these circumstances to move the rotor into a disposition from which a normal phase energisation may be followed. The motor is bi-directional and self-starting in both senses from any rotor posi- tinn

公开(公告)号：EP0188239A3

公开(公告)日：1987-10-07

申请号：EP86100257

申请日：1986-01-10

Applicant: KOLLMORGEN TECHNOLOGIES CORPORATION

Inventor： Byrne, John V. ,  O'Dwyer, Jeremiah B.

IPC: H02P07/00 ,  H02M07/515

CPC classification number: H02M7/521 ,  H02P25/0925

Abstract: In a power supply system for a variable reluctance motor, each phase winding (a, b) of the motor is connectible across a pair of supply rails by first (GTO a , GTO b ) and second (T a T e ) switch means located respectively between the first supply rail and the winding and between the winding and the second supply rail. The first switch means (GTO., GTO b ) is a fast switch-off device such as a gate tum-off thyristor or a transistor, while the second switch means (T a , T b ) is a slow turn-off device, such as a thyristor suitable for application to a line-commutation situation. In a two-phase configuration, where the second switch means is a thyristor, force- commutation of the second switch means may be achieved by means of a suitable capacitor (C c ) interconnection between the thyristors switching the respective phases.

公开(公告)号：EP0182085A3

公开(公告)日：1988-07-27

申请号：EP85112999

申请日：1985-10-14

Applicant: KOLLMORGEN TECHNOLOGIES CORPORATION

Inventor： McMullin, Francis, Dr. ,  Byrne, John V. ,  Murray, Aengus

IPC: G01D05/243 ,  G01D05/22 ,  G01D05/20

CPC classification number: G01P3/42 ,  G01D5/2053

Abstract: In a sensor having a drive winding (121) for establishing a forward field, an electrically conductive screen (123) is displaceable relative to a sense winding (122). In the presence of the drive field, eddy currents are generated in the screen to establish a counter-field opposing the forward field, so that the sense winding is shaded by the screen to a varying extent during relative displacement of screen and sense winding and the voltage induced in the sense winding is accordingly correspondingly varied. Application of a high frequency input to the drive winding (121) results in a modulated output from the sense winding (122) which may be demodulated to provide a signal indicative of screen position relative to sense winding. The position signal may be further processed to provide a speed signal. The sensor may assume a multiplicity of linear or planar, rotational and axial or solenoidal configurations.

公开(公告)号：EP0178615A3

公开(公告)日：1987-08-05

申请号：EP85112998

申请日：1985-10-14

Applicant: KOLLMORGEN TECHNOLOGIES CORPORATION

Inventor： Byrne, John V. ,  McMullin, Francis, Dr. ,  Murphy, John ,  Egan, Michael ,  Kenneally, Patrick

IPC: H02M03/335 ,  H02P06/02

CPC classification number: H02P25/0925 ,  H02P25/092

Abstract: In a power supply system, an inductance L is connected between a rail at a voltage V, and a rail at earth through a switch S. When the switch is opened, a current i 1 flowing from the inductance L is directed to a third rail through a diode D, voltage on the third rail rising to V 1 . The system may function as a dc to dc converter with an output voltage between the V 1 rail and the V 2 rail equal to V 2 -V 1 . The system may alternatively be used in, for example, a reluctance motor drive, in which case a further inductance with associated switch and diode is included in the circuit in inverse configuration to prevent excessive voltage rise on the third rail.