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Chapter 1

Chapter 1. Motor and Drive Principles. Electric Motors • Motor Torque • Electric Motor Drives. The motor power rating is located on the motor’s nameplate, which is affixed to the motor, and also includes information such as voltage and RPM ratings.

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Chapter 1

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  1. Chapter 1 Motor and Drive Principles Electric Motors • Motor Torque • Electric Motor Drives

  2. The motor power rating is located on the motor’s nameplate, which is affixed to the motor, and also includes information such as voltage and RPM ratings.

  3. A portable oscilloscope can be used to measure true power, apparent power, reactive power, or power factor.

  4. The applied voltage to a motor should be within –10% to +5% of its voltage rating for best performance.

  5. The nameplate rated current of a motor is the amount of current the motor will draw when fully loaded.

  6. When voltage and current decrease together, the problem is in the power source and distribution system.

  7. As current in the circuit increases, voltage decreases at a lesser rate.

  8. Because most motor manufacturers balance their motors at speeds 25% over nameplate rated speed, it is recommended to not operate a motor at 20% or more than its nameplate rated speed.

  9. Although motor drives can be set and programmed using switches and potentiometers, most motor drives use a keypad to program motor operating parameters.

  10. Start boost applies higher voltage initially and then follows the constant torque V/Hz pattern. Continuous boost applies higher voltage from zero to base speed.

  11. The amount of boost a motor requires is dependent upon the type of load the motor operates.

  12. Maximum operating temperatures for motor insulation are classified by the National Electrical Manufac-turer’s Association (NEMA) and the International Electrotechnical Commission (IEC).

  13. The four types of torque produced by a motor are locked rotor torque (LRT), pull-up torque (PUT), breakdown torque (BDT), and full-load torque (FLT).

  14. A motor may be fully loaded, underloaded, or overloaded.

  15. Motor loads may require constant torque (CT), variable torque (VT), or constant horsepower (CH) when operating at different speeds.

  16. If verification, documentation, or analysis is required, a portable oscilloscope can be used to capture and display measurements taken under different settings and circuit operating conditions.

  17. Basic programming parameters consist of the most commonly used programming parameters.

  18. Display parameters are used to give a visual display of operating conditions.

  19. The three main sections of an AC drive are the converter, DC bus, and inverter sections.

  20. Pulse width modulation is used to produce a pulsating DC output.

  21. When testing or troubleshooting an installed drive, a portable oscilloscope can be used to closely analyze the drive’s PWM output.

  22. As conductor length increases and an electric motor drive’s output carrier frequency increases, the transient voltages become larger.

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