Electrical & Electronics Engineering / DC Shunt Motor Speed Control
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LABORATORY 28 · ELECTRICAL & ELECTRONICS ENGINEERING

DC Shunt Motor Speed Control: Armature Voltage vs Field Flux Weakening Characteristics

Investigate speed-torque and speed-voltage characteristics of a DC shunt motor below rated speed via armature voltage control and above rated speed via field flux weakening. Explore interactive circuit analysis, electronics simulation, and electrical engineering telemetry.

CIRCUIT ANALYSIS · ANALOG · DIGITAL · MACHINES · POWER SYSTEMS · CONTROL & INSTRUMENTATION

Your virtual electrical & electronics engineering laboratory.

MEASURED ROTATIONAL SPEED N—
INSTRUMENTATION TELEMETRY

Ready to sample with Armature Voltage V_a = 120.0 V.

120.0 V
Calibrated 3-HP DC Shunt Motor-Generator Test Set & Digital Tachometer baseline operating point stabilized at 25.0 °C

Adjust Armature Voltage V_a, then execute electrical instrumentation acquisition.

Electrical telemetry is sampled with calibrated high-precision instruments using 64-bit IEEE 754 precision buffers. Residuals reflect ordinary least-squares regression across successive observations. Continuous data structures support high-fidelity circuit and power system modeling.

Electrical engineering assumptions and boundary limits

Assumes ideal linear operating conditions without thermal breakdown or non-linear core saturation Calibrated using the 3-HP DC Shunt Motor-Generator Test Set & Digital Tachometer under controlled temperature and 64-bit IEEE 754 precision instrumentation buffers. Ordinary least-squares regression yields R² > 0.99999.

Laboratory apparatus & testing equipment.

DC Shunt Motor Speed Control Precision Workstation

Provides regulated excitation, calibrated terminal access, and low-parasitic interconnects for back-emf formulation, field resistance rheostat & ward-leonard speed regulation.

True-RMS Digital Multimeter (6.5-digit Keysight / Fluke)

Measures terminal voltages, branch currents, and precision DC/AC parameters with ±0.0035% baseline accuracy.

Dual-Channel Digital Storage Oscilloscope (100 MHz, 1 GSa/s)

Captures time-domain waveforms, phase shifts, transient dynamics, and harmonic spectra for dc shunt motor speed control.

Regulated Linear DC / AC Variable Power Source

Supplies low-noise, ripple-free voltage and current excitation with adjustable current limiting.

Calibrated Decade Resistance & Component Substitution Box

Provides precision 0.1% tolerance standard passive values to establish calibrated armature voltage v_a conditions.

Four-Terminal Kelvin Lead Wire & BNC Coaxial Cable Set

Minimizes lead resistance, inductive pickup, and ambient EMI interference across all test ports.

FOLLOW THE METHOD

A reason behind every step.

Investigate speed-torque and speed-voltage characteristics of a DC shunt motor below rated speed via armature voltage control and above rated speed via field flux weakening. Standardized parameter settings: 60.0, 90.0, 120.0, 150.0, 180.0, 210.0 V.

  1. Visual Inspection & Pre-Flight Zero Tare: Inspect all circuit connections, breadboard jumpers, and terminal blocks. Verify that instrument ground planes are tied to earth and execute zero tare on all digital meters.
  2. Excitation Source & Baseline Calibration: Energize the regulated supply, set baseline operating thresholds, and calibrate the armature voltage v_a using the precision standard reference meter.
  3. Systematic Parameter Variation & Settling: Increment the armature voltage v_a systematically across the designated experimental range (60.0 to 210.0 V), permitting thermal settling at each setpoint.
  4. Multi-Meter & Oscilloscope Waveform Acquisition: Record the primary output metric (Measured Rotational Speed N) alongside auxiliary telemetry. Verify waveform symmetry, DC offset, and harmonic integrity on the oscilloscope.
  5. Cross-Validation & Redundant Trial Verification: Execute repeated forward and reverse sweeps to detect hysteresis, thermal drift, or non-linear saturation effects across the device under test (DUT).
  6. Shutdown, De-energization & Data Archival: Reduce source excitation smoothly to zero, de-energize all primary supplies, discharge residual capacitive elements, and export raw telemetry to the data buffer.
YOUR NOTEBOOK · 0 OBSERVATIONS

Turn measurements into electrical engineering insight.

See a complete example report ↗

Points are your recorded observations. The solid regression line validates DC Shunt Motor Speed Control mathematical scaling.

LINEAR REGRESSION FIT · y = mx + b
N = 6.8000 · V_a
#Armature Applied Voltage V_a (V)Measured Rotational Speed N (RPM)Armature applied voltage V_a (V)Rotational speed N (RPM)

No readings yet. Execute an electrical trial and record it.

CHECK YOUR UNDERSTANDING

Explain what the circuit metrics mean.

Question 1: In the study of DC Shunt Motor Speed Control, the primary dependent variable measured is:

Question 2: The mathematical relationship governing DC Shunt Motor Speed Control is modeled as:

Question 3: The target benchmark parameter derived from regression analysis is:

Question 4: Which instrumentation technique effectively eliminates lead wire resistance error?

THEORY AND ELECTROMAGNETIC CONTEXT

Electrical engineering background & physical principles.

The experimental analysis of dc shunt motor speed control: armature voltage vs field flux weakening characteristics investigates the electrotechnical behavior of 3-hp dc shunt motor-generator test set & digital tachometer. This university laboratory module focuses on back-emf formulation, field resistance rheostat & ward-leonard speed regulation, establishing accurate mathematical transfer characteristics across standard operational domains.

N = 6.8000 · V_a

Calibrated using the 3-HP DC Shunt Motor-Generator Test Set & Digital Tachometer under controlled temperature and 64-bit IEEE 754 precision instrumentation buffers. Ordinary least-squares regression yields R² > 0.99999.