BRUSHLESS MOTORS - Elinco

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Actions for VibrationReduction of SteppingMotorsThe biggest problem in the use of stepping motors is“Vibration.” In this section, kinds of vibration and actionsfor the improvement are explained.Vibration caused by resonanceThis is the vibration generated when the naturalfrequency of motor coincides with the input pulsefrequency. The range of 100 to 200 pps is where it isgenerated, and, in some cases, the motor will pull out ofthe synchronous speed.Vibration at low speed operationStepping motors rotate by repeating start and stop inevery step angle. Motor behavior is the repetition ofattenuation vibration, which generates large vibrationnaturally at low speed.4) To provide mechanical damperThis is a method of absorbing vibration by applyingmechanical braking force from outside. Mechanicaldampers include friction damper, flywheel damper,viscous damper and magnet damper.5) To provide electrical damperThis is a method to absorb vibration energy bychanging the condition of the surge absorbing circuitin the output stage of driver. A typical example iscapacitor damper.Capacitor damperIn this method, a capacitor is inserted between everyphase. Using the electro-motive force at ON/OFF oftransistors, a certain amount of current is applied tothe windings, which were released from excitation, forbraking. In this method it must be noted that torque isdecreased at high speed.Vibration at medium and high speedsThe attenuation vibration of stepping motor is shown inFig. 26. The over shoot in Fig. 26 affects the vibration atmedium and high speed.Actions for improving vibrationThe following actions are taken for the improvement ofvibration.1) To operate at a frequency out of resonance frequencyIn driving stepping motors, the frequency must beset basically out of resonance frequency range of100 to 200 pps.2) To change excitation modeBy changing the excitation mode to 1-2 phase excitation,the step angle is halved, resulting in smallervibration at low speed.3) To change load torqueBy increasing load torque, especially frictionaltorque, vibration energy is absorbed to reduce vibration24Elinco International Inc. 1525 Kings Highway East, Fairfield, Ct 06824Ph. (203) 275-8885 Fax (203) 334-7792 sales@elincoinc.com www.elincoinc.com
APPLICATION NOTICESTemperature riseHeat radiation of the motor must be considered whenthe motors are driven. Heat generation of the steppingmotors is generally higher than others depending on thevarious conditions. Please do not allow the temperatureof the motor housing to exceed 212° F (100 ° C).Direction of rotationThe direction of rotation is defined in the catalogue asviewed from the front of the mounting fac`e.Measuring the temperature of the motor:Thermometer methodThe temperature of the motor is measured by using athermometer or thermocouple attached to the center ofthe motor housing, after the temperature rise becomessaturated.Calculation methodThe temperature of the motor winding can be calculatedby the following formula.Temperaturet [°C] : Ambient temperatureΔ t [°C] : Temperature riseR 1[°C] : Winding resistance of the motor at theambient temperatureR 2[°C] : Winding resistance of the motor afterthetemperature risebecomes saturated.In case of this method, the winding temperature T °Cmust not exceed the allowable temperature of the motorinsulation class.Installation of the motorsMounting directionAny direction is not restricted in the installation of themotor, but usually mounting motors sideways is recommended.Regardless of the mounting direction, pleasetake care with the overhung load and thrust load on theshaft, and also free it from any shocks on the shaft.Heat dissipationThe temperature rise of stepping motors is relativelyhigh; please mount the motors tightly on the metalsurface with good thermal conductivity such as steel oraluminum by the screw and nut with a spring washer forthe heat dissipationNoise reductionA stepping motor itself easily generates vibration due tothe oscillatory step operation of the rotor even when themotor is driven at a high pulse rate, and when this vibrationis harmonized with the mounting plate, vibrationnoise is amplified and causes high acoustic noise. Inthis case, please reconsider the drive frequency and/orthe thickness and material of the mounting plate or drivingmethod. When the temperature of the motor seemslow, a rubber plate can be used effectively between themotor mounting face and mounting plate for the vibrationabsorption.Alignment of the loadWhen the motor drives a load by coupling directlyboth axes of the motor and load, please use a flexiblecoupling ring or other suitable items to make sure it getsaligned properly. Otherwise, vibration will be caused andthe life of bearings will be shortened.BLDC MOTORS SLOTLESS BLDCSTEPPING MOTORSElinco International Inc. 1525 Kings Highway East, Fairfield, Ct 06824Ph. (203) 275-8885 Fax (203) 334-7792 sales@elincoinc.com www.elincoinc.com25
Page 2 and 3: This catalog provides complete elec
Page 4 and 5: Elinco International OrganizationMo
Page 6 and 7: PART NUMBERING SYSTEMBrushless DC M
Page 8 and 9: SMALL BRUSHLESS DC MOTORSPrinciples
Page 10 and 11: Brushless DC Motor22mmELECTRICAL SP
Page 14 and 15: Brushless DC Motor42mm x 42mmELECTR
Page 18 and 19: SLOTLESS BRUSHLESS DC MOTORSWhat is
Page 20 and 21: STEPPING MOTORSFeatures of Stepping
Page 22 and 23: Basic Characteristics ofStepping Mo
Page 26: High Torque Hybrid Stepping Motor 2
Page 29: SPEED/TORQUE CURVESKM2832L3-G095A P
Page 32 and 33: Hybrid Stepping Motor 39mm 1.8°•
Page 34 and 35: High Torque Hybrid Stepping Motor 4
Page 48 and 49: Round Hybrid Stepping Motor 86mm 1.
Page 54 and 55: Hybrid Stepping Motor110mm• NEMA
Page 56 and 57: Hybrid Stepping Motor 86mm 1.2°3 P
Page 58 and 59: Hybrid Stepping Motor 110mm 1.2°3
Page 60: ELINCO ENGINEERING AVAILABLEElinco

BRUSHLESS MOTORS - Elinco

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