Controlling method of calibrating the air-core pointer assembly and device thereof
OwnerLing-Jue Lininventor
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Abstract
A controlling method and a device are disclosed to calibrate a pointer assembly of an air-core meter. The pointer assembly of the instrument includes a calibrating magnet, a cosine coil, a sine coil and a pointer. According to the polarity of the return-to-zero magnetic field established by the calibrating magnet, a compensating voltage is imposed on the cosine coil or the sine coil or both under either a voltage driving mode or a current driving mode. The compensating voltage establishes a compensating magnetic field to cancel the return-to-zero magnetic field. Therefore, without modifying the structure of the pointer set, the pointer has good linearity and is not affected by the calibrating magnet.
Claims18
A controlling device for calibrating a pointer assembly, the controlling device comprising:
- a pointer assembly having a rotor, a pointer mounted on the rotor, a cosine coil and a sine coil wound orthogonally on the rotor, and a calibrating magnet that establishes a return-to-zero magnetic field;
- a first input voltage imposed on the cosine coil;
- a second input voltage imposed on the sine coil;
- and
- a summing circuit adding the first input voltage with a compensating voltage, the first input voltage together with the compensating voltage being output to one end of the cosine coil so that the compensating voltage establishes a compensating magnetic field to cancel the return-to-zero magnetic field.
A controlling device for calibrating a pointer assembly, the controlling device comprising:
- a pointer assembly having a rotor, a pointer mounted on the rotor, a cosine coil and a sine coil wound orthogonally on the rotor, and a calibrating magnet that establishes a return-to-zero magnetic field;
- a first input voltage imposed on the cosine coil;
- a second input voltage imposed on the sine coil;
- and
- a summing circuit adding the second input voltage with a compensating voltage, the second input voltage together with the compensating voltage being output to one end of the sine coil so that the compensating voltage establishes a compensating magnetic field to cancel the return-to-zero magnetic field.
A controlling device for calibrating a pointer assembly, the controlling device comprising:
- a pointer assembly having a rotor, a pointer mounted on the rotor, a cosine coil and a sine coil wound orthogonally on the rotor, and a calibrating magnet that establishes a return-to-zero magnetic field;
- a first input voltage imposed on the cosine coil;
- a second input voltage imposed on the sine coil;
- a first summing circuit adding the first input voltage with a compensating voltage, the first input voltage together with the compensating voltage being output to one end of the cosine coil;
- a second summing circuit adding the second input voltage with the compensating voltage, the second input voltage together with the compensating voltage being output to one end of the sine coil;
- and
- the compensating voltage establishing a compensating magnetic field to cancel the return-to-zero magnetic field.
A controlling device for calibrating a pointer assembly, the controlling device comprising:
- a pointer assembly having a rotor, a pointer mounted on the rotor, a cosine coil and a sine coil wound orthogonally on the rotor, and a calibrating magnet that establishes a return-to-zero magnetic field;
- a first input voltage imposed on the cosine coil;
- a second input voltage imposed on the sine coil;
- a first summing circuit adding the first input voltage with a compensating voltage, the first input voltage together with the compensating voltage being output to a first end of the cosine coil;
- a second summing circuit adding the first input voltage with the compensating voltage, the first input voltage together with the compensating voltage being output to a second end of the cosine coil;
- and
- the compensating voltage establishing a compensating magnetic field to cancel the return-to-zero magnetic field.
A controlling device for calibrating a pointer assembly, the controlling device comprising:
- a pointer assembly having a rotor, a pointer mounted on the rotor, a cosine coil and a sine coil wound orthogonally on the rotor, and a calibrating magnet that establishes a return-to-zero magnetic field;
- a first input voltage imposed on the cosine coil;
- a second input voltage imposed on the sine coil;
- a first summing circuit adding the second input voltage with a compensating voltage, the second input voltage together with the compensating voltage being output to a first end of the sine coil;
- a second summing circuit adding the second input voltage with the compensating voltage, the second input voltage together with the compensating voltage being output to a second end of the sine coil;
- and
- the compensating voltage establishing a compensating magnetic field to cancel the return-to-zero magnetic field.
A controlling device for calibrating a pointer assembly, the controlling device comprising:
- a pointer assembly having a rotor, a pointer mounted on the rotor, a cosine coil and a sine coil wound orthogonally on the rotor, and a calibrating magnet that establishes a return-to-zero magnetic field;
- a first input voltage imposed on the cosine coil;
- a second input voltage imposed on the sine coil;
- a first summing circuit adding the first input voltage with a compensating voltage, the first input voltage together with the compensating voltage being output to a first end of the cosine coil;
- a second summing circuit adding the first input voltage with the compensating voltage, the first input voltage together with the compensating voltage being output to a second end of the cosine coil;
- a third summing circuit adding the second input voltage with the compensating voltage, the second input voltage together with the compensating voltage being output to a first end of the sine coil;
- a fourth summing circuit adding the second input voltage with the compensating voltage, the second input voltage together with the compensating voltage being output to a second end of the sine coil;
- and
- the compensating voltage establishing a compensating magnetic field to cancel the return-to-zero magnetic field.
Dependencies are inferred from the claim text.