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High Performance Low Cost Low Lost Wireless DC Motor Speed Control. Jing Guo & Yu Qiao TA: Jim Kolodziej Professor: Paul Carney. Powerpoint Templates. Product Features. Wirelessly controlled Five basic operations: start, stop, accelerate, decelerate, reset 90% efficiency with normal load

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Powerpoint Templates

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  1. High Performance Low Cost Low Lost Wireless DC Motor Speed Control Jing Guo & Yu Qiao TA: Jim Kolodziej Professor: Paul Carney Powerpoint Templates

  2. Product Features • Wirelessly controlled • Five basic operations: start, stop, accelerate, decelerate, reset • 90% efficiency with normal load • High tolerance in overload conditions • Low cost (under $12)

  3. Main Components • Control signal generating logic • Wireless transceiver with encoder and decoder • Microcontroller for PWM generation and overload detection • Low side gate driver • Buck converter

  4. Operation of the Product

  5. Control Signal Generator • Five push buttons for five commands with a 3-input NAND gate • A 3-LED array is used to test the output of the circuit.

  6. Encoder & Decoder • Forward and backward parallel to serial transformation • Testing: Connect the signal generator, encoder and decoder in cascade and test if the output from LED is consistent.

  7. Wireless Transmitter & Receiver • Operating frequency: 315 MHz • Serial data output from decoder directly feed into TX module • Digital modulate and send to antenna • RX module demodulates and amplifies the signal picked up by antenna • Serial data output to decoder

  8. Testing • Test with 1kHz square wave from function generator (waveform got duplicated at RX end) • Test with the designed circuit (the LED array at RX gives correct combination)

  9. Micro-controller Unit • MSP430G2152 • PWM Generation • Feedback Unit

  10. PWM Generation MSP430G2152

  11. Testing Connect the Control Signal Generator to the selected input and the generated waveform has the correct the frequency and changes according to the command signals

  12. Low Side Gate Driver The low side gate driver take the PWM signal as its input and then boost the voltage to 10V Testing: Connect the 3V PWM signal to the input and check if the output waveform has the same shape but swings between 0 and 10V

  13. Buck Converter

  14. Testing Connect the PWM signal from the function generator to the gate of the MOSFET. Changing the duty ratio of the PWM will change the speed of the motor correspondingly.

  15. Feedback Unit • Voltage Detector • Numerical Integral Approximation • Overload Signal Generation (detect signal and shut down signal)

  16. Control Unit Structure

  17. Numerical Integral Approximation • The average detect voltage over 100 time periods is over V_normal, then overload is detected. • If overload for 192000 time periods, output an OFF signal to PWM generator until the RESET signal is sent by the user

  18. Overload Circuit Protection Function • Two frequency modes • High (160 kHz): for normal operation • Low (1.6 kHz): for overload protection • Note: Switching from Low to High requires RESET command from the user

  19. Normal Load Setup

  20. Normal Load Efficiency Temperature Around 34 Input Power = 12.1V *12.41A = 150.04 W Output Power = 10.4V * 14.0A = 145.6 W Efficiency = 145.6W /150.04W = 97%

  21. 250W Overloading Setup

  22. 250W Overloading without Protection Temperature Around 91 Input Power = 11.97V *21.3A = 254.96W Output Power = 10.1V * 22.9A = 231.29 W Efficiency = 231.29W /254.96W = 90.7%

  23. 250W Overloading with Protection Temperature Around 31 Input Power = 11.97V *21.5A = 257.35 W Output Power = 12.8V * 16.8A = 215.04 W Efficiency = 215.04W /257.35W = 83.5%

  24. Cost • Total cost for the motor speed control parts = $10.602 • Total cost for the wireless connection parts = $55.44 • Total cost for the entire project = $66.442

  25. Challenge • Properly detect and respond to overloading • Handle high current test cases (up to 50 A) • Cost limitation ($12 per unit)

  26. Success • Transmitting and receiving control signals wirelessly • Successfully protecting the circuit by lowering frequency • Properly setup shut down point to protect the motor • Keeping the cost low

  27. Future • Applications • - Shopping cart • - Golf bag carrier • Solid competitiveness on markets

  28. Credits Professor Philip T. Krein Power lab administrator: Kevin James Colravy TA: James Kolodziej

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