Design Kit - cybernet.co.jp

1 Design KitDC Motor Speed Control CircuitAll Rights Reserved Copyright (C) Bee Technologies Inc. 20101 ContentsSlide # Simulation of DC Motor Control Motor Manufacturer Torque Constant and Back EMF The Armature Inductance and The DC Motor Equivalent Transient Response at No Transient Response at No Load (Model).. Speed at No Load (Model).. The Motor Steady-State Current Condition Transient Response at Load (Measurement vs. Simulation).. DC Motor Speed Control Circuit (No Load).. Rectified dc voltage with IC 555 Output Pulse Transistor Q2: Transistor Q1: VCE, Motor Voltage and DC Motor Speed Control Circuit (Fan Load).

2 Rectified dc voltage with IC 555 Output Pulse Transistor Q2: Transistor Q1: VCE, Motor Voltage and Rights Reserved Copyright (C) Bee Technologies Inc. 20101. The Simulation of DC Motor Control CircuitAll Rights Reserved Copyright (C) Bee Technologies Inc. 20103DC Motor Model The model features on transient characteristics of the timer IC Model The model features on functions of the simulation modelsMABUCHI MOTOR RS-380PH Voltage V Normal V Normal mN m Speed at No ,400 rpm At Normal Load ,200 rpm Manufacturer SpecificationAll Rights Reserved Copyright (C) Bee Technologies Inc.

3 20104 The Torque Constant KTis obtained as:RS-380PH at Normal Load:Torque= mN mINormal Load= AKT= = mN m/A The Back EMF Constant KEis obtained as:RS-380PH at No Load:Speed= 16,400 rpmVEMF= VNormal -RM INo Load= = V ,RM= and INo Load= (measurement data).KE= ,400 = Torque Constant and Back EMF ConstantAll Rights Reserved Copyright (C) Bee Technologies Inc. 201051 IKTorqueT =(1)SpeedKVEEMF =(2) The Armature Inductance and Resistance The Armature Inductance and Resistance are obtained with a Precision Impedance Anayzer (Agilent 4294A) LS= 165 uH and RS= m All Rights Reserved Copyright (C) Bee Technologies Inc.

4 20106 CalculatedMeasuredPrecision Impedance Analyzer |Z| vs. Frequency measured The DC Motor Equivalent Circuit This figure shows the equivalent circuit of DC motor model that includes the |Z|-frequency part ,Back EMF Voltage part ,and Mechanical Rights Reserved Copyright (C) Bee Technologies Inc. 20107|Z| - Frequency Back EMF VoltageMechanical Part(torque and speed) The Back EMF Voltage is the voltage generated across the motor's terminals as the windings move through the motor's magnetic field. The Back EMF voltage is linearly proportional to the motor's velocity in the Mechanical Part.

5 Equivalent Transient Response at No Load The test setup include 12 Vdc source ,series resistor and the motor. The result is used to obtain the start-up current and the steady state current. The time constant of the current response will be used to determine the parameters that model the motor shaft s Rights Reserved Copyright (C) Bee Technologies Inc. 20108 This figure is the motor current and voltage at start-up transient (oscilloscope screen captured).Start-up currentSteady-state currentTime Transient Response at No Load (Model)All Rights Reserved Copyright (C) Bee Technologies Inc.

6 20109 Start-up currentSteady-state currentTime constantSimulation This figure shows the result of the start-up transient simulation with RS-380PH motor model at condition 12V ,no +U1RS-380 PHKE = = constant and back EMF Speed at No Load (Model) This figure shows the simulated speed at no load (16,400rpm). To monitor the speed ,trace I( ) inside the model .SUBCKT. Note: for set "All" for the Currents of the Data Collection Options of the Simulation Rights Reserved Copyright (C) Bee Technologies Inc. 201010 Speed at No Load=16,400 Voltage= The Motor Steady-State Current Condition Setting (1/2)All Rights Reserved Copyright (C) Bee Technologies Inc.

7 201011 Steady-state current= (no load)Simulation This figure shows the current waveforms of the motor with the different rated torque load ,that result as the different steady-state current. Since the simulations are focusedon the electrical world ,the RS-380PH spice model is directly conditioned by input the steady-state current= (motor with fan)-+U1RS-380 PHIL = {IL}Input the Steady-State Current load condition.(ex. IL= for the No Load or IL= for the motor with fan). The Motor Steady-State Current Condition Setting (2/2)All Rights Reserved Copyright (C) Bee Technologies Inc.

8 201012 Steady-state current= the value of IL = for the steady-state current condition (the value is not matched).-+U1RS-380 PHIL = This figure shows the unmatched value of the steady-state current condition when Vcc condition is (not a 12 Vdc). Steady-state current simulated result will match the model input value IL only when the condition Vcc is 12 Vdc . In the other case , IL value is changed until the desired steady-state current condition is Transient Response at Load (Measurement vs. Simulation) This figure shows the result of the start-up transient simulation with RS-380PH motor model at condition 12V , load.

9 The result is compared to the voltage and current waveformsobtained by the Rights Reserved Copyright (C) Bee Technologies Inc. 201013 SimulationMeasurementIM(t) ,2A/DIVVM(t) ,5V/DIVThe test setup include 12 Vdc source , series resistor and the RS-380PH motor with = 00D3D4001D1D1N4148R330kR25kD2D1N4148RV1{ v r1}RV2{500k-v r1}PARAMETERS:v r1 = 250 KOUTGNDINU3uPC7812A-+U2RS-380 PHIL = = 50 VAMPL = 15 VOFF = 0D5D4001D6D4001D7D4001D4D4001C21nFIC = 00 RegU1LM5551234567803. lm555 DC Motor Speed Control Circuit (No Load)Analysis directives: .TRAN 0 0 4u SKIPBP.

10 OPTIONS ABSTOL= GMIN= ITL4= RELTOL= VNTOL= Rights Reserved Copyright (C) Bee Technologies Inc. 201014 The circuit is simulated and compared with the measured waveforms from oscilloscope (Tektronix: TDS3054B) to verify the simulation using the RS-380PH model. C11nFIC = 00D3D4001D1D1N4148R330kR25kD2D1N4148RV1{ v r1}RV2{500k-v r1}PARAMETERS:v r1 = 250 KOUTGNDINU3uPC7812A-+U2RS-380 PHIL = = 50 VAMPL = 15 VOFF = 0D5D4001D6D4001D7D4001D4D4001C21nFIC = Rectified dc voltage with rippleAll Rights Reserved Copyright (C) Bee Technologies Inc.