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Servo Feedback Devices and Motor Sensors
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
The Hall effect provides information regarding the type of magnetic pole and magnitude of the magnetic field. Sensors based on the Hall effect principle are called Hall effect sensors. A Hall effect sensor employs a magnetic phased array sensor passing through a magnetic field to produce a signal that is then interpolated to resolution. Though Hall effect sensors essentially are magnetic field sensors, they can be applied in many other types of applications for measuring position, velocity, force, current, pressure, temperature, etc. Among the various sensing technologies, Hall effect sensors have long been used in numerous industrial segments for their small sizes, ruggedness, ease-of-use, and relatively low cost [8.31]. They can operate at high frequencies and are not affected by environmental contaminants. Compared with other motion feedback devices, however, Hall effect sensors feature low sensitivity, low breakdown voltage, and susceptibility to temperature; all limit sensors to use in high voltage power systems. In addition, Hall effect sensors are less precise. Therefore, Hall effect sensors provide the simplest and least expensive solution for applications that do not require precise speed or position controls.
DC machines
Published in William Bolton, Engineering Science, 2020
Note: a Hall effect sensor is essentially one where a magnetic field causes the current in a piece of material to be deflected from its straight path through the sensor material and so gives a potential difference between the sides at right angles to the initial path of the current. The size of the potential difference is then a measure of the size of the magnetic field.
Power Converters Used in Body Systems
Published in Dorin O. Neacşu, Automotive Power Systems, 2020
The Hall effect was first noted by Dr. E. H. Hall, hence the name. If a certain type of crystal is carrying a current in a transverse magnetic field, then a voltage will be produced at right angles to the supply current (Figure 5.20). The magnitude of the voltage is proportional to the supply current and to the magnetic field strength. The Hall based position sensor is typically made from semiconductors such as silicon and germanium. The Hall-effect sensors work by measuring the Hall voltage across two of their faces when you place them in a magnetic field. Some Hall sensors are packaged into convenient integrated circuit chips with control circuitry and can be plugged directly into bigger electronic circuits.
Effects of Hall current and nonlocality in a magneto-thermoelastic solid with fractional order heat transfer due to normal load
Published in Journal of Thermal Stresses, 2022
The combined effect of electric and magnetic field causes Hall current in a conductor. Hall effect is produced in a conductive material when a magnetic field is introduced perpendicular to the direction of flow of current in the material. Magneto-thermoelastic materials are very important due to their wide range of applications in the fields of engineering, geomagnetism, geophysics, nuclear fields, seismology and various other related fields. The concept of nonlocality states that the properties of a material are dependent upon the state of material at different points of the body. It considers the state of stress at a point of a body as a function of state of strains due to all the points of the body. The use of fractional derivatives is highly useful in the various fields of science and engineering. It helps in the formulation of more economical physical problems.
Solar PV Combined Efficient Torque Control of BLDC Motor Using Salp Swarm Optimization
Published in Electric Power Components and Systems, 2023
G. Jayabaskaran, S. Suresh, B. Gopinath, M. Geetha
Additionally, the need for sensors to identify the rotor position with Back EMF estimation. To use Hall Effect sensors for this purpose. Hall Effect sensors are contactless sensors that use a magnetic field to detect the position of the rotor and generate an electrical signal proportional to the magnetic field. This signal can then be used to estimate the Back EMF of the rotor, allowing us to accurately identify its position. It is believed that using Hall Effect sensors will be the most reliable and efficient way to identify the rotor position.