Fasco Industries, Inc.

Michael D Smith

James Russel Peterson

William Arthur Ziegler

Christopher Douglas Schock

Jack D Rinehart

Parimalalagan Ramachandran

Rickey W Jennings

Thien Q Tran

A bearing system and journal which may incorporate either a sleeve or a ball bearing. The system includes a bearing journal having a sleeve bearing portion and a ball bearing portion. When a sleeve bearing is used in the system, a first end of the sleeve bearing is supported in the sleeve bearing portion of the journal, and a second end of the sleeve bearing is supported by a finger spring. The sleeve bearing and finger spring are retained within the journal by an end cap, which is press-fit into the ball bearing portion of the journal. When a ball bearing is used in the system, the ball bearing may be press-fit directly into the ball bearing portion of the bearing journal, or press-fit into a spacer, which is press-fit into the ball bearing portion of the bearing journal.

Electric motor bearing system and journal

An apparatus and method for controlling a motor/blower system to provide a constant fluid flow by iteratively loading revised stator frequency values and stator voltage values to a variable frequency drive. Target DC bus current values corresponding to constant fluid flow rates are predetermined and stored as a function of the desired fluid flow rate, the operating frequency, and system specific constants or calculated by the controller as a function thereof during system operation. Actual DC bus current is measured with a current sensor and compared with the target DC bus current. Operating frequency is estimated using a PI controller based on the difference between measured and target DC bus current values. Operating voltage values corresponding to operating frequencies and system specific constants are predetermined and stored in memory or calculated by the controller during system operation. An updated target DC bus current, operating frequency and operating voltage are determined upon each iteration. The updated operating frequency and operating voltage are loaded as control variables to the variable frequency drive upon each iteration.

System specific fluid flow control with induction motor drive

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Jefferson City, MO, United States of America

Michael D Smith