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Pneumatic Stepper Motor

IP.com Disclosure Number: IPCOM000040605D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Gardell, DL: AUTHOR [+2]

Abstract

A pneumatic stepper motor driven by compressed air, and capable of replacing an electric motor to obtain linear or rotary indexing in hazardous environments, is described in this article. The basic principle of operation involves a series of pneumatic rams and a linear rack or circular, rack-shaped face cam. Figs. 1A and 1B show three air cylinder rams 1, 2 and 3 and a rack 4. Beginning in Fig. 1A, pressure is released from ram 2 and applied to ram 1, forcing the rack 4 to move to the right as shown in Fig. 1B. Alternatively, the rack will move to the left if pressure is applied to ram 2 in Fig. 1B, and air is released from ram 1. Sequencing ram (Image Omitted) pressure from the rams in the order 132132132... will thus move the rack continuously to the right while in the order 123123123... will move it to the left.

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Pneumatic Stepper Motor

A pneumatic stepper motor driven by compressed air, and capable of replacing an electric motor to obtain linear or rotary indexing in hazardous environments, is described in this article. The basic principle of operation involves a series of pneumatic rams and a linear rack or circular, rack-shaped face cam. Figs. 1A and 1B show three air cylinder rams 1, 2 and 3 and a rack 4. Beginning in Fig. 1A, pressure is released from ram 2 and applied to ram 1, forcing the rack 4 to move to the right as shown in Fig. 1B. Alternatively, the rack will move to the left if pressure is applied to ram 2 in Fig. 1B, and air is released from ram 1. Sequencing ram

(Image Omitted)

pressure from the rams in the order 132132132... will thus move the rack continuously to the right while in the order 123123123... will move it to the left. It should be noted that each step in the sequence moves the rack the same distance regardless of direction. By cutting a rack-shaped face cam on the outer surface of a cylinder, as demonstrated in Figs. 2A and 2B, the stepping motion of the rack in Figs. 1A and 1B can be converted to a stepped rotary motion. Figs. 2A and 2B are not to scale, and do not depict proper positioning of the air rams, but serve to illustrate the side and top view, respectively, of the face cam 5 and air rams 1, 2 and 3 in this application. Desired motor characteristics may be obtained from this application by use of appropriate gearing, as illustrated...