Bruce A Roth

US Patent:

60152702, Jan 18, 2000

Filed:

Apr 16, 1997

Appl. No.:

8/834371

Inventors:

Bruce A. Roth - Chandler AZ

Assignee:

Air Conditioning Technologies - Mesa AZ

International Classification:

F04B 300

US Classification:

417259

Abstract:

A two stage compressor or pump with integral electronically controlled multiphase linear motor incorporates a cup shaped moving piston as a stator. The linear motor body has an intake head with valve fitted at the end adjacent to the closed end of the cup shaped piston. A discharge head with a central discharge tube extending into the hollow center of the cup shaped moving piston is fitted to the opposite end of the motor body. As the piston reciprocates it draws the working fluid in through the intake valve, compresses and transfers it through an interstage valve in the closed end of the moving piston into a second variable volume chamber formed by the inside of the cup shaped piston and the discharge tube which acts as a fixed piston, and then further compresses and transfers it out through a valve in the discharge tube. While the design is particularly well suited for use as a compressor in air conditioning and refrigeration systems, it can also be used as a pump.

US Patent:

49658646, Oct 23, 1990

Filed:

Dec 7, 1987

Appl. No.:

7/129541

Inventors:

Paul E. Roth - Phoenix AZ
Bruce A. Roth - Glendale AZ

International Classification:

H02K 4100

US Classification:

318135

Abstract:

An electromechanical linear motor incorporating a number of electrically conductive drive coils arranged axially and embedded in a composite matrix so as to form a hollow cylinder within which a piston or pistons are placed. Permanent magnets or conductive coils arranged around the circumference of the pistons interact through magnetic coupling with the drive coils so as to cause the piston to move in accordance with the currents applied to the drive coils. These currents are supplied through logic control circuitry which receives inputs from a number of sensors including piston position sensors, thermostats, pressure transducers and timers. Based on the information received from these sensors, a microprocessor controlled power circuit provides electrical pulses of a frequency, amplitude and duration designed to produce piston motion appropriate to the specific application.