Growing concern for environmental protection has led to renewed interest in hybrid cars. A high-efficiency DC brushless motor running on AC is commonly used in plug-in hybrid vehicles. Increasing demand for DC brushless motors in the automotive sector is expected to propel the global precision electric motors market at a CAGR of 12.7% during the period from 2014 to 2020. The overall market was worth US$22.69 billion in 2013 and was dominated by DC brushless motors.
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Why Brushless DC Motors in Electric Vehicles?
Hybrid vehicles developed by auto manufacturers across the globe are majorly powered by DC brushless motors. Brushless DC motors, also known as BLDC motors, have DC current powering magnets that move the rotor around within the stator. The step motor controller of brushless DC motors converts the electrical energy into mechanical energy. Some of the advantages of brushless DC motors are:
Less Wear and Tear: Due to lack of physical commutators and brushes, brushless DC motors have fewer parts subjected to wear and tear. As a result of this, brushless DC motors are efficient, reliable, and can last over 10,000 operational hours. This is particularly important for keeping the maintenance costs of hybrid cars low, which is one of the important USPs of hybrid cars in modern markets.
High Speed and Less Noise: Operating at speeds above 10,000 rpm, these motors operate with less noise and electromagnetic interference than a brushed motor.
Auto Manufacturers Focus on Increasing Efficiency of DC Brushless Motors Installed in Hybrid Vehicles
In the automotive industry, manufacturers are stressing on increasing the efficiency and durability of DC brushless motors for smooth running of hybrid vehicles. The incorporation of advanced brushless electric motors figures as an important aspect of recent hybrid cars launched by key auto manufacturers.
Mercedes Benz C350e: In the Detroit Motor Show 2015, Mercedes Benz unveiled its first plug-in hybrid, the C350e. The hybrid car has a 2.0-litre four-cylinder engine with a brushless electric motor. The car delivers a total of 275 horsepower, of which 80 horsepower is produced by the electric motor alone. To keep up with the rising demand for hybrid cars, the auto manufacturer aims to launch 10 such hybrids by 2017.
Lamborghini Asterion: Last year’s Paris Motor Show witnessed Italian car manufacturer Lamborghini revealing its first hybrid car – Asterion. The three brushless electric motors installed in the car generate 296 horsepower of a total figure of 898 HP.
BMW 5-Series GT Fuel Cell Electric Vehicle: German carmaker BMW has partnered with Toyota to develop the new 5-series GT fuel cell electric vehicle. The car is fuelled by hydrogen and emits only water vapor. The fuel cell of the car produces enough electricity to power a brushless electric motor located within the rear axle assembly. The brushless electric motor, also used in BMW’s i3 electric car and i8 hybrid sports car, generates 150 kW.
Audi A7 H-tron Quattro: The twin electric motors installed on the plug-in hybrid fuel cell system of Audi’s A7 H-tron (the ‘H’ standing for hydrogen) Quattro deliver a combined 170 kW and 540 Nm of torque.
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Though the brushless DC motor is more expensive to manufacture than its brushed counterpart, the rising popularity of green vehicles is expected to increase the demand for brushless DC motors in the near future.
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