Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1982-12-07
1985-08-13
Shoop, Jr., William M.
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, 363 98, H02P 602
Patent
active
045352755
ABSTRACT:
To provide for reliable commutation of a single-strand or single-line winding (25) connected in the diagonal of a transistor bridge circuit (40, 40') having four transistors (70-73) which are alternately rendered conductive in accordance with a Hall-IC rotor position sensor (32) affected by the field of a permanent magnet rotor (13), time delay capacitors (64, 66; 87) are connected to charge current sources, for example high-resistance resistors (59, 63; 88, 90, 95) to delay turn-ON of respective transistors of the bridge permitting current flow through the winding in a first direction after commutation from the other transistors (71, 72) of the bridge which are being turned OFF or blocked, so that a finite time interval or gap of no current flow is provided to reliably prevent possible short-circuit currents across the power supply buses (44, 45) if the inherent switching characteristics of the transistors are longer than the commutation interval. The capacitors are connected to a rapid-discharge circuit, for example through diodes (62) or the inherent semiconductor, such as a transistor (54) in a Hall generator-integrated circuit combination. If transistors of inherent sufficient capacity, and switching delay for switching ON are used, external capacities (87) may not be needed, the internal capacity of the transistor switching providing for sufficient time delay, with the switching-OFF being assisted by the aforementioned diode or discharge circuit (54, 89).
REFERENCES:
patent: 3047789 (1962-07-01), Lowry
patent: 3898544 (1975-08-01), Tanikoshi
patent: 3986086 (1976-10-01), Muller
patent: 4030005 (1977-06-01), Doeman
patent: 4164690 (1979-08-01), Muller
patent: 4296362 (1981-10-01), Beasley
patent: 4376261 (1983-03-01), Heide et al.
patent: 4403174 (1983-09-01), Miyazaki et al.
patent: 4409526 (1983-10-01), Yamauchi et al.
Papst-Motoren GmbH & Co. KG
Ro Bentsu
Shoop Jr. William M.
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