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Motor types Overview Motor type End equipment Advantages Disadvantages 直流馬達 Universal/DCBrush Low cost appliances Fans, hand tools Automotive Low cost Easy to control Unreliable (maintenance cost) Poor performance (low efficiency, heavier) 交流感應馬達 AC Induction(ACI) White goods Pumps Industrial automation (almost everywhere) Easy to manufacture Efficient Reliable Low cost Difficult to control Thermal management (heat) Larger size White goods Pumps Blowers (HVAC) Automotive Very efficient Highest toque/amp Smaller, lighter Higher cost Difficult to mfg. (magnets glued on) Susceptibility to demagnetization in field weakening regions Automotive Emerging in white goods Industrial automation Safe (no sparks) Easy to manufacture Low mfg. cost Very high speed operation Very difficult to control High torque ripple (discontinuity due to discrete steps) Possibility of reverse start-up rotation 直流無刷馬達 Brushless DC(BLDC) 切換式磁阻馬達 Switched Reluctance(SR) Benefits of DSP Based Control Motor Strengths Easy to control Motor Type Stepper DSP Benefits Less torque ripple than microstepping, easy upgrade to higher performance motor types Easy to control DC Brush Low Maintenance, lightweight DC Brushless More accurate positioning and velocity control, less power dissipation, multi-axis control, advanced adaptive algorithms Precision current control, real-time rotor position sensing, speed calculation and torque command (adaptive), advanced control algorithms, reduction in number of sensors and memory High torque generation, low cost AC Induction Executes complex control algorithms for field oriented control & vector modulation, supports short sampling period for high dynamic performance, estimates current offset and rotor resistance for temperature compensation Simple construction, low system cost Switched Reluctance Current control, torque ripple compensation, active noise cancellation BLDC/DC Motor Control Scheme BLDC/DC Motor Control Scheme Benefits of DSP Benefits of DSP PMSM Control Scheme PMSM Control Scheme -Benefits of DSP Benefits of DSP ACI Control Scheme