refer to specification sheet for the Johnson HC68G PMDC motor. Plot the Speed (y-axis) vs Toque (x-axis) curve for the rated voltage.Calculate Ra, Ke, and Kr in SI units.The motor is driving a load that remains at 60 milli Nm independent of speed. Calculate the voltage required to drive the load at 20,000 pm in steady state.In a detailed motor test, the torque constant measures 5% below the calculated value. Explain this deficiency and suggest a method to remedy the problem. HC685G-302Characteristics:High torque DC motorSpecifications:DimensionsShaft DiameterInput VoltageNo Load SpeedNo Load CurrentNominal SpeedNominal TorqueNominal CurrentStall TorqueStall CurrentMaximum Output PowerMaximum EfficiencyTorque at Maximum EfficiencySpeed at Maximum EfficiencyLife (Typical)WeightOperating Temperature RangeStorage Temperature RangeElectrical ConnectionPerformance Data:Current (A)Efficiency (%)Output Power (W)Speed (rpm)Torque (mNm)No Load1.0926700Application Examples:Hand-held Vacuum Cleaners:Ø 35.8 X 50.0 mm: Ø 3.175 mm: 18.0 V DC: 26700 rpm: 1.09 A: 20500 rpm: 67.70 mNm: 12.40 A: 367.80 mNm: 55.00 A: 242.00 W: 63%: 67.70 mNm: 20500 rpm: 100 hr: 150 g: -10 to 55 °C: -20 to 80 °C: TerminalsStall Maximum Efficiency55.00367.8012.4063145.402050067.70Maximum Power28.9646242.0012500183.90Low Voltage DC Motors

For a Johnson HC685G-302 motor, we need to answer the following questions:plot the speed vs torque…

Answered: refer to specification sheet for the…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

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refer to specification sheet for the Johnson HC68G PMDC motor.

Plot the Speed (y-axis) vs Toque (x-axis) curve for the rated voltage.
Calculate Ra, Ke, and Kr in SI units.
The motor is driving a load that remains at 60 milli Nm independent of speed. Calculate the voltage required to drive the load at 20,000 pm in steady state.
In a detailed motor test, the torque constant measures 5% below the calculated value. Explain this deficiency and suggest a method to remedy the problem.

HC685G-302
Characteristics:
High torque DC motor
Specifications:
Dimensions
Shaft Diameter
Input Voltage
No Load Speed
No Load Current
Nominal Speed
Nominal Torque
Nominal Current
Stall Torque
Stall Current
Maximum Output Power
Maximum Efficiency
Torque at Maximum Efficiency
Speed at Maximum Efficiency
Life (Typical)
Weight
Operating Temperature Range
Storage Temperature Range
Electrical Connection
Performance Data:
Current (A)
Efficiency (%)
Output Power (W)
Speed (rpm)
Torque (mNm)
No Load
1.09
26700
Application Examples:
Hand-held Vacuum Cleaners
:Ø 35.8 X 50.0 mm
: Ø 3.175 mm
: 18.0 V DC
: 26700 rpm
: 1.09 A
: 20500 rpm
: 67.70 mNm
: 12.40 A
: 367.80 mNm
: 55.00 A
: 242.00 W
: 63%
: 67.70 mNm
: 20500 rpm
: 100 hr
: 150 g
: -10 to 55 °C
: -20 to 80 °C
: Terminals
Stall Maximum Efficiency
55.00
367.80
12.40
63
145.40
20500
67.70
Maximum Power
28.96
46
242.00
12500
183.90
Low Voltage DC Motors

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