JPS6023761U - rotation sensor - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a conventional electromagnetic induction rotation sensor, Fig. 2a is a diagram showing the detection coil output waveform of the sensor shown in Fig. 1,
Figure 2 shows a binarized waveform of the waveform shown in Figure 2a, Figure 3 is a configuration diagram of the rotation sensor according to the present invention, and Figure 4a shows two detection coils of the one shown in Figure 3. Figure 4 is a diagram showing the binarized waveform of the waveform shown in Figure 4a. Figure 5 is a configuration diagram of a circuit that measures the time difference between the detection signals of two detection coils. It is. In the drawings, 1 is a gear, 2 is a rotating shaft, 3 is a tooth, 4 is a permanent magnet, 5a, 5b are iron cores, 6a, 6b are detection coils, 7a,
7b is a binarization circuit, and 8 is a time difference measuring device.

Claims (1)

[Scope of utility model registration request] a gear formed of a magnetic material that rotates in a constant relationship with the rotation of a rotating body to be measured; a permanent magnet disposed close to the gear so as to form a magnetic path via the teeth of the gear; It consists of two magnetic paths formed between the gear image and the permanent magnet, shifted in position in the direction of the tooth arrangement of the gear, and two detection coils arranged to surround each of these magnetic paths. . A rotation sensor, characterized in that the number of revolutions is measured by the rotation of the gear from the time difference between the output signals of the two detection coils.