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.

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refer to specification sheet for the Johnson HC68G PMDC motor.

 

  1. Plot the Speed (y-axis) vs Toque (x-axis) curve for the rated voltage.
  2. Calculate Ra, Ke, and Kr in SI units.
  3. 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.
  4. 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
Transcribed Image Text: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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