DEVICE FOR MEASURING coercive force of magnetic materials

摘要

The present utility model relates to the field of nondestructive testing of physical and mechanical properties of materials, namely the magnetic structuroscopy products of ferromagnetic materials by measuring their coercive forces, and can be widely used in machine building and metallurgy, the technical oversight, and other areas of technology. The main drawback of all devices for measuring the coercive force of magnetic materials is the presence of large measurement error due to considerable fluctuations nonmagnetic gap between the poles of the electromagnet and controlled object control surface. The claimed device solves the problem of significantly improved precision with large changes nonmagnetic gap between the poles of the electromagnet and controlled object control surface. Said technical result in the implementation of the utility model is achieved in that the device for measuring the coercivity of the magnetic material comprising two sensor magnetic field parallel to each other sensitivity axes disposed on the working surface of the device, the magnetic field sensors are connected to the transducer and the indicator that is graduated in units coercivity, further comprises a cylindrical magnet, located under the pole of the electromagnet, third magnetic field sensor with an axis parallel to the solenoid axis sensitivity, a logarithmic amplifier and a correction unit, the logarithmic amplifier input connected to the output of the magnetic field of the third sensor, and an output connected to one of the inputs of the correction unit, the other input of the correction unit is connected to the output of the transmitter, and the output - indicator. In a device both electromagnets may be combined into a single unit, wherein the cylindrical magnet is located in the center between the poles of a bipolar electromagnet.