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- What equipment is a rotary sensor used for?
See "Features/Applications" and "Selection Guide (Field-proven Applications)." Rotary sensors are suited to rotation, linear motion and proximity sensing at high speed. Products with custom specifications are available. Contact us for details.
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- What is the detecting distance?
When the target is a gear, the detecting distance varies depending on the gear module and sensor sensitivity. For 8-bit detection, the detecting distance is 0.2 mm when the module is 0.4, and 1.5 mm when the module is 2.
Output voltage is attenuated in inverse proportion to the square of the distance between the sensor and target. Refer to "Output Voltage/Gap Characteristic."
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- Can the sensor be used in a very dirty environment?
This rotary sensor is resistant to very dirty environments except those containing magnetic substances such as iron powders. Therefore, this sensor is used for applications different from encoders incorporating an optical sensor.
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- What precautions should be followed when mounting this rotary sensor?
Set the sensor on the centerline of the gear. The sensor is directional. Referring to the Terminal Connection Diagram, set the sensor so that the sensor's direction of detection is parallel to the gear's direction of rotation. Use a thickness gauge or the like to mount it the specified distance from the gear. Although the sensor's detecting surface is protected with a metallic enclosure, the sensor may be damaged if it is subject to an impact hard enough to cause visible damage to the enclosure. Contact us if special adjustments are required. See "Combination of Pulser and Sensor." For the sensor tightening force, contact us.
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- What gear material is best suited to detection with the sensor?
Although the best material is a ferrous metal attracted by a magnet, especially pure iron, ordinary low carbon steel (S45C, SS21) is recommended. As the target, a gear is ideal for obtaining the best performance from the sensor, but a magnetic drum whose magnetization is applied in segments to the circumference of a drum made of a material with a high holding capacity can be detected effectively. Magnetic gears are suitable for pulsers of Murata's sensors.
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- What is the "module"?
The "module" is related to the tooth-to-tooth pitch of gears. The module is the value obtained by dividing the pitch diameter of a gear by the number of the teeth; the value obtained by multiplying the module by pi (3.14) is the tooth-to-tooth pitch. The sensor's element-to-element pitch should be one-half of the tooth-to-tooth pitch.
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- What is the magnitude of detectable modules?
The larger the module, the larger the sensor to be used. Considering value, the maximum module is approximately 3. However, we offer products applicable to a variety of modules. Contact us for details.
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- What is the distortion rate of the output waveform?
The distortion rate varies with the setting conditions. See "Waveform Distortion Rate."
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- Can standstill (0Hz) be detected?
Because this rotary sensor is a resistance change type, it can detect a standstill position.
A passive-type coil sensor, however, provides output characteristics proportional to the speed; therefore, it is difficult to detect standstill with this type of sensor.
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- What is the response frequency?
Although the response frequency varies slightly depending on the pulser's material, it is generally 0 to 100kHz. The cut-off frequency is at the megahertz (MHz) level.
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- Are current output or 2-wire output possible?
Both are possible.
Detection is performed by inserting a pull-up resistor and using 2-wire power supply and current signal lines.
<2-wire output block diagram>
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- To what extent can the rotary sensor be made more compact?
The sensor size is determined by the area of the built-in elements. This area is determined by the operating temperature range, the module and the number of output phases when the pulser is a gear. When the number of phases is two, the operating temperature is 80°C, and the module is 0.4, the enclosure measures approximately 17 mm in outside diameter and 18 mm in height.
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- Can the rotary sensor be used in a vacuum or corrosive atmosphere?
Products with custom specifications are in use in such environments. Contact us for details.
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