| 摘要 |
A constant voltage DC power source for operating a methane monitoring system for mining equipment and the like. A hydraulic motor teed from the main hydraulic system of the mining equipment is connected in series with a flow control element. In this way, the hydraulic motor turns fast enough to cause a generator to charge a storage battery during only periods of high pressure. The field of the generator is controlled by a voltage regulator which limits the voltage in the storage battery to a preset level. The storage battery supplies constant DC current to the monitoring system.
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