New single chip hall sensor for three phase brushless motor control

For the detection of the rotor position two fundamental principles exist: Position sensors, often Hall sensor based, track the rotor position and provide this information to the electronic control circuit.In the domain of permanent running applications as blowers, pumps and compressors, so called sensor less principles can be applied.This impacts classic, belt driven mechanical domains, moving them into electrically controlled ones.Additional to that we have also new electric systems coming in, for instance battery cooling applications, which are needed in HEVs and EVs.

New single chip hall sensor for three phase brushless motor control

In comparison to a DC motor, a BLDC motor has no mechanical brushes to do the motor commutation.Moreover, the ratio of torque delivered relative to the motor’s size is higher, making it a good choice for applications such as washing machines and EVs, where high power is needed but compactness and lightness are critical factors. kostenlose sexdating Kassel (However, it should be noted that brush-type DC motors do have a higher starting torque.) A BLDC motor is known as a “synchronous” type because the magnetic field generated by the stator and the rotor revolve at the same frequency.The stator of a BLDC motor comprises steel laminations, slotted axially to accommodate an even number of windings along the inner periphery (Figure 1).While the BLDC motor stator resembles that of an induction motor, the windings are distributed differently.

New single chip hall sensor for three phase brushless motor control

The rotor is constructed from permanent magnets with two-to-eight N-S pole pairs.More magnet pairs increase torque and smooth out so-called torque ripple, evening the power delivery from the motor.The article also considers some of the integrated modules – that the designer can select to ease the circuit design – which are specifically designed for BLDC motor control. New single chip hall sensor for three phase brushless motor control-24New single chip hall sensor for three phase brushless motor control-43New single chip hall sensor for three phase brushless motor control-47 The advantages of brushless operation The brushes of a conventional motor transmit power to the rotor windings which, when energized, turn in a fixed magnetic field.The brushless DC (BLDC) motor is becoming increasingly popular in sectors such as automotive (particularly electric vehicles (EV)), HVAC, white goods and industrial because it does away with the mechanical commutator used in traditional motors, replacing it with an electronic device that improves the reliability and durability of the unit.

Another advantage of a BLDC motor is that it can be made smaller and lighter than a brush type with the same power output, making the former suitable for applications where space is tight.Examples are fuel pumps, main and auxiliary water coolant pumps, oil pumps, engine cooling fans and HVAC blowers.Especially these applications require energy efficient electric motor driving, so that the classic DC motors will be more and more replaced by BLDC (Brush less DC) motors.MLX81200 and MLX81201 are the 1st members of a 3 phase BLDC single chip controller family, that are consequently using Melexis Tru Sense.A single IC connected to a LIN or PWM interface with only a few external components is able to control a BLDC motor of the mentioned applications in the range from 10W…1500W.


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