Overview on Design of Electric Coolant Pump for Automotive Application 2019-26-0114
In today’s scenario, India has decided to leap frog introduction of stringent statutory regulations, has resulted in earlier introduction of hybridization and electrification of vehicles. This has made both Original equipment manufacturers and suppliers to align their strategies towards achieving this goal. Though there are solutions available around the globe, it will be a challenge to design and develop products, which are highly reliable at lower cost. Electric coolant and circulation pump is one of the auxiliary device that can be used to cool the power train components and other accessories such as cabin heating, battery and electronic circuits cooling. In this overview, an attempt is made to brief the different options available for the designer to design an electric coolant pump in terms of construction, design and material selection.
Design process of electric coolant pump starts with the target requirement flow input, which is used to calculate the torque, speed and power of the motor to arrive at the motor specifications. This forms the input for finalizing the controller design. Various design options are available to select and design a controller and is decided on trade-off between features and cost. Since the rotor portion of the motor is exposed to the coolant, design and material selection of sealing is critical in order to prevent the coolant exposed to the electrical components.
Selection of material of the magnet and process of fixing of magnet with rotor is critical in optimizing the size and cost of the motor. For pumping of the fluid, impeller plays a vital role of increasing the head and flow of the coolant. Various types of impellers are available like open type, close type and shrouded type. Based on the packaging, losses and manufacturing challenges, appropriate impeller type can be selected. The volute profile on the front housing will also have an impact on the head rise of the coolant. So the incorporation of the impeller and volute profile to attain the required flow and head is critical. The above overview of critical design parameters, selection of appropriate material and process will help the designers to optimize the design in terms of compactness and cost.