Course "EEM 2 DC Machines" Photo: Siemens AG SH5007-1A Version 1.0 Author: M.Germeroth Lucas-Nülle GmbH · Siemensstraße 2 · D-50170 Kerpen (Sindorf) Tel.: +49 2273 567-0 www.lucas -nuelle.de Some animations require that a Flash player is installed. Should your system not have a Flash player installed, you can download the latest version at any time from Macromedia. Copyright © 2005 LUCAS-NÜLLE GmbH. All rights reserved. LUCAS-NÜLLE Lehr- und Messgeräte GmbH Siemensstraße 2 D-50170 Kerpen EEM2 DC machines Training objectives 1 Equipment for 300 W Industrial Series 2 Information page "Alternative Equipment" 3 Safety 5 DC shunt-wound motors 7 Connection and starting 9 Rotation reversal 15 Speed control 19 Load characteristic 27 DC shunt-wound generators, separately excited 31 Voltage control (field control range) 33 Voltage polarity 37 Load characteristic 41 DC shunt-wound generators, self-excited 47 Rotation direction and polarity 49 Load characteristic 53 DC series-wound motors 57 Connection and starting 59 Rotation reversal 63 Load characteristic 67 DC compound-wound motors 73 Load characteristics for various compound ratios 75 Copyright 85 EEM2 DC machines EEM2 DC machines Training objectives In this course you will acquire practical knowledge regarding the topic of DC machines. Experiment-based investigations of series-wound, shunt-wound and compound- wound machines are at the focal point of this course and explore such aspects as how the machines function, respond and operate. Training contents z Motors, generators z Series-wound, shunt-wound and compound-wound windings z Measurement of armature current, exciter current and voltage z Nominal data, rating plate z Speed adjustment z Rotation reversal z Magnetic field weakening z Armature and field resistors z Power measurement with and without load Prerequisites z Fundamentals of electrical machines z Fundamentals of electrical engineering z How to handle measuring instruments Welcome to the DC machines course. The team from LUCAS-NÜLLE wishes you lots of fun and success in completing the course topics and conducting the experiments. The following pages provide you with an overview of the course contents and the materials and equipment required. 1 EEM2 DC machines Equipment for 300 W Industrial Series *Alternative equipment to the universal load SO3212-6W SO3636-6U Active machine testing stand 300 W 1 SE2662-2A Coupling sleeve 300 W 1 SE2662-7B Coupling guard 300 W 1 SE2672-3D DC multi-function machine 300 W 1 SO3212-6W Universal load for 300 W machines 1 SO3212-6B Starter for DC machines* 1 SO3212-5F Field regulator for DC machines* 1 SO3212-6M Load resistor for generator experiments* 1 SO3212-5H Field regulator for generator experiments* 1 SO3212-5U Power supply for electrical machines 1 SO5127-1Z Analog/digital multimeter, wattmeter and power factor meter 2 SO5148-1F Set of 47 safety connecting leads 4mm 1 SO5126-9X Set of safety connection plugs, 19/4 mm 15 SO5126-9Z Set of safety connection plugs, 19/4 mm, with tap 5 2 EEM2 DC machines Information page "Alternative Equipment" Universal load (SO3212-6W) for DC motors (connection example: "DC shunt-wound motor") Starter (SO3212-6B) and field regulator (SO3212-5F) for DC motors (connection example: "DC shunt-wound motor") 3 EEM2 DC machines Information page "Alternative Equipment" Starter (SO3212-6M) and field regulator (SO3212-5H) for DC motors (connection example: "DC shunt-wound motor") 4 EEM2 DC machines Safety Basic safety instructions In all experiments using mains voltages high, life-threatening voltages arise. For that reason use only safety measurement leads and make sure that there are no short- circuits. It is imperative that all of the devices, which are provided with an earth or where earthing is possible, must be earthed. This is particularly the case for the frequency converter being used. Always be very careful to check the wiring of the application modules and only switch on the mains voltage after a check has been completed. Whenever possible use a robust current monitoring instrument in the circuit. Always use shaft-end guards and coupling guards as protection against contact with rotating motor parts All locally applicable stipulations and standards governing how electrical equipment is handled must be complied with. 5 EEM2 DC machines Safety General instructions on handling the equipment { Check that the knurled screws at the base of the motor and the coupling sleeves (power grip) on the motor shaft are all securely fastened. { Use shaft and coupling guards. { Any prolonged running of the machines when operating under high loads can subject the machines to excessive heating. { The extreme case of the machine being prevented from rotating entirely may only arise briefly. { All of the machines are equipped with a thermal circuit-breaker, which triggers when the maximum permissible operating temperature is exceeded. These switching contacts are accessible on the terminal board and must always be connected to the corresponding connection sockets of the mains supply and control unit. { All measurements have been recorded using conventional measuring instruments (primarily class 1.5) at the standard mains voltage (230/400V +5% -10% 50Hz) using standard production machines. Experience suggests that measurements will lie within the tolerance range of +/-15% with respect to the specified measurement. For more information on this please refer to VDE0530. 6 [...]... for DC shunt-wound motor "Connection and starting" 10 EEM2 DC machines DC shunt-wound motors Set-up for DC shunt-wound motor "Connection and starting" Put the shunt-wound motor into operation Required settings: Starter: minimum value (0 Ω) DC power supply unit: 220V Experiment procedure: Put the motor into operation and observe its operating response 11 EEM2 DC machines DC shunt-wound motors The motor. ..EEM2 DC machines DC shunt-wound motors DC shunt-wound motors Over the next few pages you will perform the following exercises pertaining to "DC shunt-wound motors": Connection and starting Reversing rotation direction Speed control Load characteristics 7 EEM2 DC machines DC shunt-wound motors 8 EEM2 DC machines DC shunt-wound motors Training content: "Connection and... subject the motor to any load Note: setting of the DC power supply unit can only be performed when the motor is connected More detailed information on the brake can be found in the corresponding online documentation Circuit diagram for DC shunt-wound motor "Speed control" 19 EEM2 DC machines DC shunt-wound motors Set-up for DC shunt-wound motor "Speed control" 20 EEM2 DC machines DC shunt-wound motors Record... motor to any load Note: setting of the DC power supply can only be carried out when the motor is connected More detailed information on the brake and the software used can be found in the appropriate online documentation Circuit diagram for DC shunt-wound motor "Load characteristic" 27 EEM2 DC machines DC shunt-wound motors Set-up for DC shunt-wound motor "Load characteristic" 28 EEM2 DC machines DC. .. motors Set-up for DC shunt-wound motor "Rotation Reversal" Rotation reversal Required settings: Starter: minimum value (0 Ω) DC power supply: 220V Experiment procedure: Switch on the motor and observe how it responds Note: setting of the DC power supply can only be performed when the motor is connected 17 EEM2 DC machines DC shunt-wound motors What is the motor' s direction of rotation? The motor rotates... EEM2 DC machines DC shunt-wound motors Assembly instructions: "Rotation Reversal" Assemble the circuit as specified in the following circuit diagram and setup instructions Include an ammeter and voltmeter in the the armature circuit Switch on the brake This does not yet subject the motor to any load Circuit diagram for DC shunt-wound motor "Rotation Reversal" 16 EEM2 DC machines DC shunt-wound motors... starting" Identify the terminal connections of the motor and operate the motor as a shunt-wound motor Read the nominal data of the motor based on the rating plate Connect the motor to the starter Be familiar with how the starter works Operate the motor with the brake Subject the motor to a load Measure armature voltage and current Enter the nominal data for the DC machine UA= V IA= A UE= V IE= mA... torque of the motor as given by the following equation: 22 EEM2 DC machines DC shunt-wound motors Placeholder for characteristics n(M), Ua=220/190/160V Record the characteristics of "If" and "n" as a function of Rf Required settings: Brake mode: "Torque Control" Field regulator: minimum value (0 Ω) DC power supply unit: (armature & exciter circuit) 220V 23 EEM2 DC machines DC shunt-wound motors Experiment... clockwise j k l m n The motor rotates anti-clockwise j k l m n Switch the motor off and modify the circuit as shown by changing the polarity of the exciter coil Turn the motor back on and observe its response Circuit diagram for DC shunt-wound motor "Rotation reversal" (reversed rotation direction) What is the motor' s direction of rotation now? The motor rotates clockwise j k l m n The motor rotates anti-clockwise... diagram the highest degree of efficiency obtainable 29 EEM2 DC machines DC shunt-wound motors What is the nominal torque? MN= Nm Placeholder for graph η(M) (η => „Eta“), IA(M), P2(M), n(M) What is the maximum efficiency "η" for the shunt-wound motor? η= % approx 30 EEM2 DC machines DC shunt-wound generators, separately excited Separately excited DC shunt-wound generator Over the next few pages you will . VDE0530. 6 EEM2 DC machines DC shunt-wound motors DC shunt-wound motors Over the next few pages you will perform the following exercises pertaining to " ;DC shunt-wound motors": z. control z Load characteristics 7 EEM2 DC machines DC shunt-wound motors 8 EEM2 DC machines DC shunt-wound motors Enter the nominal data for the DC machine Match the winding designations. not yet subject the motor to any load 10 EEM2 DC machines DC shunt-wound motors Set-up for DC shunt-wound motor "Connection and starting" Put the shunt -wound motor into operation