Air core gauge with expanded pointer range
AssigneeStewart-Warner Corporation
InventorsJohn D. Baker, Bryce W. Carus
Life of this patent
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Abstract
An air core gauge is provided with a plurality of angularly oriented coils. Switching means are connected to the coils in order to control the flow of current therethrough. Pulse generators responsive to variations in frequency of electrical signals representative of a condition, such as vehicle speed or engine RPM, control the switching means so as to cause excitation of the coils to produce a resultant mmf vector, the angular position of which is related to the frequency of the signals. The resultant mmf vector causes a magnet and associated pointer to rotate to thereby provide an indication of the value of the condition.
Claims31
In condition monitoring apparatus, a plurality of coils angularly positioned with respect to each other, means for supplying electrical energy to each of said coils, switching means connected to each coil to control the flow of current in the coil to which it is connected, means for receiving repetitive input pulses, the frequency of which represent a condition to be monitored, pulse generation means having a plurality of outputs connected to said pulse receiving means for producing different control pulses on each of said outputs in response to the receipt of a single input pulse and means connecting each of said switching means to a separate one of said outputs to enable said switching means in response to a control pulse to cause a current flow in the coil to which it is connected so as to produce a resultant magnetic field.
Dependencies are inferred from the claim text.