X-ray tube anode speed reducer
US5090041A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1990 |
| Grant date | Feb 18, 1992 |
| Priority date | — |
| Expiry date | Sep 20, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05G1/66
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A rotor speed adjustment circuit (60) reduces the rotational speed of an anode (32) of an x-ray tube (14) in a diagnostic apparatus (10). An AC current (64) from an AC current source (54) is applied to one stator winding (52). A parallel connected diode (70) and resistor (72) are connected between the current source and a second stator winding (50) to cause an effective DC magnetic braking component (66b) which reduces the rotational speed of the anode and an associated rotor (42). By selectively adjusting the resistor (72), the size of the DC magnetic braking component, hence the amount of effective drag is selectively adjustable to adjust the anode rotation speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.