Method and apparatus for controlling a blower motor in an air handling system to provide constant pressure
US5019757A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1990 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Mar 19, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/70
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Apparatus and method for controlling a motor having a stationary assembly with a plurality of winding stages for carrying motor current and further having a rotatable assembly in driving relation with a blower in an air handling system. The apparatus provides control of the pressure over a range of flow restrictions to maintain air pressure in the system at a relatively constant preselected level. The apparatus receives a preselected pressure signal representing the preselected air pressure level. A microprocessor, responsive to both the preselected pressure signal and a motor speed signal, generates a desired torque signal which is a function of the preselected pressure signal, the speed signal and a previous desired torque signal. The desired torque signal is compared to a signal representing motor torque and a comparison signal representing the comparison is generated. An IC control applies a motor voltage to one or more of the winding stages at a time in accordance with the comparison signal and commutates the winding stages in a preselected sequence to rotate the rotatable assembly. As a result, the blower is driven by varying the motor speed according to motor torque (i.e., t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.