Molly Ayala
There are a variety of ways to measure physical rotation electrically. One of the most common methods is to use a sensor to detect the rotation. The two most common types of sensors used for this purpose are optical and magnetic. Optical sensors rely on either reflection or interruption, while magnetic sensors use a magnet attached to the rotating member. Other types of sensors used to measure rotation include gyros, capacitive encoders, synchros, inductive sensors, resistors, magnetometers, and accelerometers. In addition to sensors, rotary position sensors such as the PHS series can also be used to track mechanical changes. Torque sensors are another option, which measure the force that causes an object to rotate or twist.
| Characteristics | Values |
|---|---|
| Sensors | Hall-effect, VR, ECKO, optical, rotary encoder, gyros, capacitive encoders, synchros, inductive sensors, resistors, magnetometers, accelerometers, absolute rotary encoder, potentiometer, contactless encoder |
| Sensor functions | Magnet detection, vane sensing, geartooth sensing, reflective sensing, rotary sensing |
| Sensor features | Low cost, resistant to electromagnetic interference, reliable, inexpensive, simple, flexibility, accuracy, speed |
| Other tools | Mechanical methods, pendulum, rotary shaft, pointer, scale, disk, stepper motor, accelerometer chip, digital interface, power supply, physical switch, jumper |
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What You'll Learn
- Hall-effect sensors: Low-cost sensors that can measure rotation speed and are resistant to electromagnetic interference
- Optical encoders: Sensors that can measure rotation angle and angular velocity
- Torque transducers: Convert torque into an electrical signal
- Strain gauges: Used to measure physical phenomena like pressure, temperature, and vibration
- Pendulum pivot point: Using a gear on the pivot point, coupled with a linear gear, to measure the rotation
Hall-effect sensors: Low-cost sensors that can measure rotation speed and are resistant to electromagnetic interference
Hall-effect sensors are an effective and low-cost solution for measuring rotation speed. They are also highly resistant to electromagnetic interference.
The Hall-effect sensor is named after physicist Edwin Hall and is based on the Hall effect, which involves the production of voltage proportional to the axial component of the magnetic field vector B. When a magnetic field is produced by electrons flowing through a conductor, a voltage is created, which can be measured without making contact. This is particularly useful for current sensing applications.
Hall-effect sensors are used for proximity sensing, positioning, speed detection, and current sensing. They are commonly used in industrial and consumer applications, with hundreds of millions of Hall sensor integrated circuits (ICs) sold each year. They are often used in automotive applications, such as fuel-level indicators, ignition timing, and speed sensing.
Hall-effect sensors are also used in some computer printers to detect missing paper and open covers, and in 3D printers to measure filament thickness. They are well-suited for use in electronic devices due to their small size and ability to measure rotation speed. For example, they are used in smartphones to detect whether a cover is closed and in video game controllers for enhanced precision and a longer lifespan.
The TLE4966V is a dual-Hall sensor that can detect both the rotation direction and speed of a magnetic pole wheel. This sensor is especially useful for space-constrained applications due to its vertical Hall plates, which allow for sensing in-plane magnetic fields.
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Optical encoders: Sensors that can measure rotation angle and angular velocity
There are various methods and sensors to measure physical rotation electrically. Optical encoders are one such sensor that can measure rotation angle and angular velocity.
Optical encoders are classified into two types depending on the format of the output electrical signal: incremental and absolute. The incremental method outputs the angle change (movement amount) of the rotating disc, while the absolute method outputs the absolute angle of the rotating disc.
The optical encoder is composed of a light-emitting device (LED), photo sensors, and a disc called a code wheel with slits (holes) in the radial direction. When the code wheel attached to a rotating shaft rotates, an optical pulse is generated depending on whether light passes through a slit in the code wheel or not. The photo sensor detects the optical pulse, converts it into an electrical signal, and outputs it.
The resolution of an optical encoder is determined by the number of slits in the code wheel. To achieve high resolution, the number of slits must be increased, but this requires reducing the area of each slit to miniaturize the encoder. As a result, high precision is needed for assembling the components, and physical limits are eventually reached.
Optical encoders have the advantage of being easy to improve in accuracy and resolution by devising the shape of the slit. They are also used in applications where a strong magnetic field is generated, as they are unaffected by the surrounding magnetic field.
In summary, optical encoders are a type of sensor that can measure rotation angle and angular velocity. They are composed of LEDs, photo sensors, and a code wheel with slits, and they output electrical signals corresponding to the rotation of the shaft. To improve resolution, the number of slits in the code wheel can be increased, but this also increases the complexity of the assembly process. Optical encoders are advantageous due to their accuracy, resolution, and ability to operate in strong magnetic fields.
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Torque transducers: Convert torque into an electrical signal
Torque transducers are instruments that can measure the torsional force (force to rotate and force to stop) applied to a shaft. They are used in quality control, experiments, and research. Torque meters come in two shapes: flange type and shaft type. Flange types are thin and can be installed in a space-saving manner. Shaft types have low capacity but allow for high-precision and high-speed rotation.
Torque transducers can be static or dynamic. Static torque transducers use reaction torque sensors, while dynamic torque transducers use rotary sensors. There are also rotary transformer systems, which are electromagnetic induction torque meters with two sets of transformers, one for power supply and the other for signal transmission. Optical transmission torque transducers are also available, which convert measured strain into an electrical signal, which is then converted into an optical signal that emits an LED and is received by an optical receiving element.
Himmelstein offers a range of torque transducers that use highly accurate strain gauges to measure torque. The signals from rotating types are digitized on the rotor and transmitted to the stator, where they are processed into usable analog, frequency, and digital outputs. Himmelstein offers both rotating and non-rotating types of torque transducers, which are digitally based. The signal from rotating types is transmitted as digital data to the stator, where analog and frequency signals are created along with digital data.
There are a variety of other sensors that can be used to measure rotation. Optical methods rely on either reflection or interruption. A reflective sensor shines a beam of light against the target and measures the reflected beam. This method can be used to measure the speed of passing features as they change the amount of light reflected, and can also measure the distance to the target. Another method is to use a Hall-effect sensor, which measures a magnet passing by as an electrical spike. This can be accomplished by embedding a small magnet into the rotating shaft.
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Strain gauges: Used to measure physical phenomena like pressure, temperature, and vibration
There are various methods and sensors available to measure physical rotation electrically. Some of the most commonly used sensors are optical and magnetic. Optical methods rely on reflection or interruption. A reflective sensor shines a beam of light at the target and measures the reflected beam. This method can be used to measure the speed of passing objects and the distance to the target. Another simple and inexpensive method is to attach a small magnet to the rotating shaft, which is then measured by a Hall Effect Sensor as an electrical spike.
Strain gauges are used to measure physical phenomena such as pressure, temperature, and vibration. They are sensors that convert force, pressure, tension, weight, etc., into a change in electrical resistance which can then be measured. The most common type of strain gauge consists of an insulating flexible backing that supports a metallic foil pattern. The gauge is attached to the object with an adhesive, and as the object is deformed, the foil is deformed, causing its electrical resistance to change. This change in resistance is proportional to the applied strain, allowing for strain measurement. Strain gauges are commonly used in engineering and structural analysis to measure stress and strain in materials such as load cells, pressure sensors, and force transducers. They offer advantages such as high accuracy, sensitivity, and reliability.
There are different types of strain gauges available, such as electrical resistance strain gauges, vibrating wire strain gauges, fiber optic strain gauges, and piezoelectric strain gauges. Electrical resistance strain gauges are the most widely used type and offer high sensitivity, accuracy, and stability, making them suitable for measuring small strains in structures. Vibrating wire strain gauges are used in geotechnical and civil engineering applications and consist of a vibrating, tensioned wire. The strain is calculated by measuring the resonant frequency of the wire. Fiber optic strain gauges utilize optical fibers to measure strain by detecting changes in light intensity or wavelength propagating through the fiber. Piezoelectric strain gauges employ the piezoelectric effect to measure strain.
Strain gauges are susceptible to environmental factors such as temperature, humidity, and vibration, which can interfere with the accuracy of measurements. Proper environmental controls and shielding techniques are necessary to mitigate these influences. Additionally, each strain gauge has a specific measurement range beyond which accurate readings may not be possible. They are also delicate and can be easily damaged during construction or accidental impacts, so protecting them is crucial for reliable measurements.
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Pendulum pivot point: Using a gear on the pivot point, coupled with a linear gear, to measure the rotation
There are various methods to measure physical rotation electrically. One such method is using a pendulum pivot point. This involves placing a gear on the pivot point of the pendulum and coupling it with a linear gear, often referred to as a rack and pinion system.
The gear on the pivot point interacts with the linear gear, converting rotational motion into linear motion. The size of the gear on the pivot point is crucial; a larger diameter gear results in higher linear displacement, providing greater resolution in measuring the rotation. This setup allows for the measurement of the linear position, which can be determined using potentiometers or other suitable tools.
The use of a pendulum pivot point system offers a creative approach to measuring physical rotation electrically. It showcases how gears and simple machines can be utilised to transform motion and facilitate measurements. This method can be adapted for specific requirements, such as the need for higher precision or unique constraints.
Additionally, it is important to consider the entire system when choosing a sensor to measure rotation. This includes understanding the properties of the intended sensing target and its environment. Various sensors can be employed, such as gyros, optical encoders, capacitive encoders, synchros, and other inductive sensors. Each sensor has unique characteristics and applications, catering to different resolution and accuracy needs.
Another method to measure rotation is by using a Hall-effect sensor. This involves embedding a small magnet into the rotating shaft, creating an oscillating magnetic field that generates an electrical field. Hall-effect sensors are highly resistant to electromagnetic interference and can be designed for very low cost. They are commonly used for magnet detection, vane sensing, and geartooth sensing, with magnet detection being the simplest scheme to implement.
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Frequently asked questions
You can use a small magnet embedded in the rotating shaft. A Hall Effect Sensor in the housing measures the magnet's passing by as an electrical spike. Alternatively, you can use a rotary encoder, a potentiometer, or a simple pointer attached to the shaft.
There are various sensors that can be used, such as gyros, optical encoders, capacitive encoders, synchros, inductive sensors, resistors, magnetometers, and accelerometers. The choice of sensor depends on the specific requirements of your project, such as resolution and accuracy.
Hall Effect Sensors are inexpensive, immune to dirt and contamination, and provide consistent performance over a wide range of speeds. They are also highly resistant to electromagnetic interference.
