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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

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Gardell, DL Thompson, ML [+details]


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.