DC Motors Types: Continuous Rotation Servo (Remote Control)

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Presentation transcript:

DC Motors Types: Continuous Rotation Servo (Remote Control) Stepper (Bipolar, Unipolar, Universal) Ratings: Volts, Amps, RMP, Stall Current, Torque Torque: 1 ft lb = 192 oz in 1 oz in = 72 gm cm 1 Nm = 10,200 gm cm 1 ft lb = 1.356 Nm = 13,825 gm cm

DC Motors (Continuous) 1.5 VDC to 24 & 48 VDC 3000 - 8000 RPM <50% rated voltage (no rotation) >130% rated voltage (over heating) Speed Control - Pulse Width Modulation Direction Control - Reverse Polarity

DC Motors (Servo) Remote Control via Pulse Width Modulation Partial Rotation (180° - 210°) PMW 1.0 ms Pulse = Left Rotation 1.5 ms Pulse = Neutral 2.0 ms Pulse = Right Rotation

Servo Motors https://en.wikipedia.org/wiki/Servomotor https://en.wikipedia.org/wiki/Servo_%28radio_control%29 http://pcbheaven.com/wikipages/How_RC_Servos_Works/ Arduino and 28BYJ-48 Stepper Motor and ULN2003 Driver Intro (Bret Stateham) https://www.youtube.com/watch?v=B86nqDRskVU http://www.instructables.com/id/Arduino-Library-for-28BYJ-48-Stepper-Motor-and-ULN/

DC Motors (Stepper) Variable Reluctance (free rotation) n Phases = n Coils = 2n Poles Permanent Magnet (cog/detent resistance) Bipolar Unipolar Universal

Variable Reluctance Steppers n Coils = n Phases = 2n Poles One end of each coil connected to Common Common connected to Power Supply Each n phase lead grounded in turn i.e. grounding the phase lead applies current to the circuit

Permanent Magnet Steppers Leads Type 4 wire Bipolar (no center-tap) 5 wire Unipolar common center-tap 6 wire Unipolar individual center-tap 8 wire Universal (Bipolar / Unipolar)

Universal Stepper Motor 4 Independent Coils (8 wires) Coils wired in parallel = Unipolar Coils wired in series = Bipolar

Bipolar Stepper Motor Two phase (4 wires) Not center-tapped Each coil individually energized Reverses polarity (hence the term “bipolar”) More complex control circuits Requires H-Bridge for every coil More torque per unit size

Bipolar Stepper Motor

Unipolar Stepper Motor Center-Tapped Internal Common (5 wire) Separate Commons (6 wire) Connect Center-Tap(s) to +VDC Power supply Ground Phase Leads via Control Pulses in turn Full Stepping Half Stepping Power Stepping Requires 2 power Provides 1.44 torque

Unipolar Stepper Motor