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Motors as Dynamo's
| Author | Message | ||
| Michael Woodhouse Unregistered guest |
DC Motor as a dynamo: I am looking for the most cost-effective way of converting 40Nm at 10 RPM (42W of shaft power), from a small water wheel, into DC power, at any voltage in the range 12V to 110V. I am looking for a PM DC Motor that I can drive backwards, to act as a dynamo, via a suitable gearbox* that matches the water wheel shaft speed (which is fixed) to the speed needed by the motor, acting as a dynamo, to output 42W (less losses) into a resistive electrical load. *NB: "Gearbox" means any arrangement for stepping up the speed to the required value. This could be by toothed gearwheel, sprocket & chain or pulley & belt, whichever is the most practical/economic. The water wheel shaft is aluminium, 40mm OD. The motor (dynamo) and gearbox need to be continuously rated and be suitable for operation in the temperature range zero to 40deg C (exposure to minus 20deg C in winter but not operating!) Unit will be protected from rain, dust etc but could be splashed with water on occasions. Shape/size/weight is not a constraint within reason -- just money! Please provide cost and details for a motor/gearbox combination that will do this duty. Thanks Michael Woodhouse |
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| Admin (Admin) Board Administrator Username: Admin Post Number: 985 Registered: 10-2004 |
Michael, The only motor I can spot in our range that may work for you is 1450-322. This motor has an integral planetary type gearbox but I have no information as to how it would survive being driven backwards. We do have other non-geared motors but you would need to make up your own step up gearing, again we have a wide range of suitable products. My gut feeling is that your application is probably not cost effective using new parts. |
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| kenchan Unregistered guest |
hi there, looking for a DC motor that produce approx 10W with about 1000 rpm, any suggestion? don't matter with size, is to run a wind turbine for uni project! asap! thank you Ken |
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| Admin (Admin) Board Administrator Username: Admin Post Number: 991 Registered: 10-2004 |
Ken, Our motors tend to run with nominal speeds of 3-15,000 rpm. You are better running a motor as close as possible to its nominal rating rather than having an over sized motor and running is slowly. This means gearing the motor to give its nominal speed with your turbine speed of 1000 rpm. We do have geared motors that may work for you, such as the 1450-052 that gives out about 9V at 1077 rpm and should achieve just over 10W power. No promises as to how well it will work as they were not designed to be used in this way. |
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