MQ1 based Redesign of Battery Blower Fan Motor. March, 2018
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1 MQ1 based Redesign of Battery Blower Fan Motor March, 2018
2 Benchmarking Process A battery cooling blower fan motor is procured from the market. The motor is benchmarked Physical dimension benchmarking by measuring the following, Weight of active material Key stator and rotor dimensions Winding pattern and conductor details Magnet composition and magnetic characteristics of magnet Performance benchmarking by measuring the following, Closed circuit mid-airgap flux density Cogging torque No-load and load performance 2
3 Benchmarked Motor End user: Toyota automotive Motor manufacturer: Shinano Kenshi Part number: G Motor model number: DR Motor type: Brushless (BL) DC motor 3
4 Benchmarked Motor Specifications (Published by Shinano Kenshi) Reference: 4
5 Motor Assembly and Key Weights Motor controller Rotor assembly ( with magnet and pole housing) Stator Magnet No. of turns/coil: 23 turns Conductor diameter: 0.45 mm (AWG 25) Weight of copper = g Material: Injection molded ferrite Number of poles: 10 poles Magnet weight: 32.8 g Density: 3.65 g/cm 3 5
6 Stator and Rotor Dimensions and Winding Diagram Rotor Stator Winding Diagram 6
7 Magnet Analysis: B-H Characteristics Magnet Type: Sr-Ferrite B-H curve Magnetics Br 0.29 T Hci 210 ka/m Hc 170 ka/m (BH)max 15.9 kj/m 3 Magnet Characteristics 7
8 Connections to Control Circuit, Closed Circuit Flux Density and Cogging Torque Measurment Supply voltage = 14 V SI Control signal and has to be set to high. Vm Output voltage signal corresponding to motor speed T pk-pk_cogging = 16.7 N-mm Closed circuit mid-airgap flux density measurement Cogging torque measurement 8
9 No-Load and Load Performance Measurement No-load current (A) No-load speed (rpm) No-load Measurement No-load performance of motor Load Measurement Motor s load performance 9
10 MQ1 based Redesign 10
11 Approach to arrive at MQ1 Based Redesigned Motor Using the commercially available motor design software Motor-CAD, a motor is designed with compression molded MQ1 magnet. The motor is designed for an optimal active material cost. During the design following additional constrains are imposed, The airgap for the redesigned motor is same as benchmarked motor The conductor current density is similar or lower from the one in benchmarked motor The slot fill is similar or lower from the one in benchmarked motor 11
12 MQ1 Based Redesigned Motor: Performance T pk-pk_cogging = 2.78 N-mm Phase and line 3000 rpm Cogging torque Motor current at T= rpm Developed 3000 rpm 12
13 Comparison of Benchmarked and Redesigned Motors Performance Comparison of benchmarked and redesigned motor performance MQ1 based redesign offers the enhanced motor efficiency, 77.6% compared to 64.1% for benchmarked motor 13
14 Comparison of Benchmarked and Redesigned Motors Key Physical Dimensions MQ1 based redesign offers the following advantages, Comparison of key physical dimensions for benchmarked and redesigned motors Substantial weight and volume reduction 49% Weight and 60% Volume reduction compared to benchmarked motor For the same overall fan envelop a smaller motor dimeter offers an opportunity to increase the blade size and hence the possibility of increase in overall air flow. 14
15 Comparison of Key Physical Parameters for Benchmarked and Redesigned Motors Parameter Benchmarked Redesigned Magnet Ferrite MQ1 No. of pole No. of slots Skew angle ( ) 0 6 Outer diameter (mm) Length (mm) Length of airgap (mm) Weight of magnet (g) Weight of copper (g) Weight of motor (g) No. of turns/coil Coil Wire diameter (mm) 0.45 (AWG 25) (AWG 26) Current & efficiency (T= rpm) 1.40 A / 64.13% 1.20 A / 77.59% 15
16 Observations MQ1 based redesign offers the following advantages, Enhanced efficiency of motor 77.6% compared to 64.1% for benchmarked motor Substantial weight and volume reduction 49% Weight and 60% Volume reduction compared to benchmarked motor For the same overall fan envelop a smaller motor dimeter offers an opportunity to increase the blade size and hence the possibility of increase in overall air flow. Negligible cogging torque when the magnetization with optimal skew is used 16
17 Questions? Want to know more? Collaborate with us? Contact us, Visit our Technical Website 17
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