Patent Number: 8,797,023

Title: Coercive force specifying apparatus

Abstract: Provided is a coercive-force specifying apparatus capable of creating a demagnetization curve for each divisional area of a coercive-force distributed magnet without breaking the coercive-force distributed magnet and of specifying an average coercive force for each divisional area precisely. A coercive force specifying apparatus of the present invention includes: a yoke including an insertion space into which a coercive-force distributed magnet is to be inserted; a magnetizing coil; a search coil that detects a magnetization change when the magnetic field is applied to the coercive-force distributed magnet; and a tracer that creates a demagnetization curve on a basis of a voltage value generated due to the magnetization change. The end face is provided with two or more loop-shaped thread grooves bored therein, the search coil being provided in each thread groove. The coercive-force distributed magnet includes a divisional area defined so as to correspond to each of the two or more search coils, and a voltage value due to a magnetization change detected by each search coil is transmitted to the tracer for creation of a magnetization curve at a corresponding divisional area as well as for specification of an average coercive force.

Inventors: Suzuki; Masafumi (Aichi, JP), Kogure; Tomonari (Anjo, JP), Nakanishi; Mayumi (Anjo, JP)

Assignee: Toyota Jidosha Kabushiki Kaisha

International Classification: G01R 33/16 (20060101)

Expiration Date: 8/05/12018