Simple Model of DC Motor using LTspice

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Simple Model of DC Motor using LTspice by Bee Technologies

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Simple Model of DC Motor using LTspice

  1. 1. D.C. MotorSimplified SPICE Model All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 1
  2. 2. Contents 1. Benefit of the Model 2. Model Feature 3. Parameter Settings 4. D.C. Motor Specification (Example) 5. Motor Start Up Simulation at Normal Load 6. Motor Start Up Simulation at Half of Normal Load 7. Lj of the Motor Model (1/2) 8. Application Example 9. Winding Characteristic Parameters: Lm 10.Winding Characteristic Parameters: Rm Simulation Index All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 2
  3. 3. 1. Benefit of the Model• The model enables circuit designer to use D.C. Motor as load in their design which include: Back EMF, Torque(Nm) and Speed (rpm) characteristics.• The model can be easily adjusted to your own D.C. Motor specifications by editing a few parameters that are provided in the spec-sheet. All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 3
  4. 4. 2. Model Feature 1 H1 TRQ + - 1 H RM L1 {Rm} 100m 0 LM 2 E_EMF {Lm} N4 EMF IN+ OUT+ OUT+ IN+ IN- OUT- H2 Rdmy OUT- IN- EVALUE + - GRB 2 H GVALUE 0 0 Equivalent circuit of the D.C. Motor model• This D.C. Motor Simplified SPICE Model is for users who require the model of D.C. Motor as a part of their system.• Perform electrical (voltage and current) and mechanical (speed and torque) characteristics at current load (Ampere) conditions. All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 4
  5. 5. 3. Parameter SettingsD.C. Motor model and Parameters with Default Value Model Parameters: If there is no measurement data, the default value will be used: Rm: motor winding resistance [] Lm: motor winding inductance [H] Data is given by D.C. motor spec-sheet: V_norm: normal voltage [V] mNm: normal load [mNm] kRPM_norm: speed at normal load [kr/min] I_norm: current at normal load [A] Load Condition: IL: load current [A] All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 5
  6. 6. 4. D.C. Motor Specification (Example) D.C. Motor Specification Parameters are input All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 6
  7. 7. 5. Motor Start Up Simulation at Normal Load (1/2)Simulation Circuit and Setting Input the Supply No Load Voltage* and Series Resistance Simplified D.C. Motor with RS-540SH Spec. Current Sensing Load Condition IL=I_norm*No Load Voltage is adjusted until the D.C. motor voltage (VM) equals to the normal voltage (7.2V).*Analysis directives:.TRAN 0 400m 0 0.1m.PROBE V(*) I(*) W(alias(*)) D(alias(*)) NOISE(alias(*)) All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 7
  8. 8. 5. Motor Start Up Simulation at Normal Load (2/2) Torque Load= 19.6mNm D.C. Motor Speed = 14.4krpm D.C. Motor Voltage = 7.2V D.C. Motor Current = 6.1A All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 8
  9. 9. 6. Motor Start Up Simulation at Half of Normal Load (1/2)Simulation Circuit and Setting Input the Supply No Load Voltage* and Series Resistance Simplified D.C. Motor with RS-540SH Spec. Current Sensing Load Condition IL=I_norm *No Load Voltage is adjusted until the D.C. motor voltage (VM) equals to the normal voltage (7.2V).*Analysis directives:.TRAN 0 400m 0 0.1m.PROBE V(*) I(*) W(alias(*)) D(alias(*)) NOISE(alias(*)) All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 9
  10. 10. 6. Motor Start Up Simulation at Half of Normal Load (2/2) Torque Load= 9.8mNm D.C. Motor Speed = 18.4krpm D.C. Motor Voltage = 8.725V D.C. Motor Current = 3.05A All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 10
  11. 11. 7. Lj of the Motor Model (1/2)Simulation Circuit and Setting Input the Lj value or input “{Lj}” for parametric sweep*Analysis directives:.TRAN 0 400m 0 0.1m.STEP PARAM Lj LIST 100m, 200m All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 11
  12. 12. 7. Lj of the Motor Model (2/2) The Motor Start-up Waveform is changed by the Lj values. Lj=200m Torque Load= 19.6mNm Lj=100m D.C. Motor Speed = 14.4krpm Lj=100m Lj=200m Lj=100m D.C. Motor Voltage = 7.2V Lj=200m Lj=200m D.C. Motor Current = 6.1A Lj=100m All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 12
  13. 13. 8. Application Example (1/3)Simulation Circuit and Setting VDD VCC VCC Simplified D.C. Motor with RS-380PH Spec at No load. Vdd Vcc 15V 15V U2 SMPL_DC_MOTOR Rm = 0.576 0 0 D2 + Lm = 165u D4001 - V_norm = 7.2 mNm = 9.8 kRPM_norm = 14.2 I_norm = 2.9 U1 IL = 0.6 R1 NC VCC VDD 1u A NC RG No load IL=0.6 120 D3 V1 = 0 V1 K VO DGT10J321_s V2 = 1.8 U3 TD = 0 NC GND GT10J321 TR = 10n TF = 10n PW = 199.99u TLP350 PER = 400u 0 0 0 0 All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 13
  14. 14. 8. Application Example (2/3) Measurement Simulation 14A 20V 1 2 12A 10V 10A 0V Motor Voltage (10V/Div) 8A -10V 6A -20V Motor Current (2A/Div) 4A -30V 2A -40V 0A -50V >> -2A -60V -100ms 0s 100ms 300ms 500ms 700ms 900ms 1 I(U2:1) 2 V(U2:1,U2:2) Time All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 14
  15. 15. 8. Application Example (3/3) Measurement Simulation 14A 50V 20V 1 2 3 12A 40V 10V 10A 30V 0V IGBT: VGE IGBT: VGE (10V/Div) 8A 20V -10V 6A 10V -20V 4A 0V -30V IGBT: VCE IGBT: VCE (10V/Div) 2A -10V -40V 0A -20V -50V IGBT: IC >> IGBT: IC (2A/Div) -2A -30V -60V 898.0ms 898.4ms 898.8ms 899.2ms 899.6ms 1 I(U3:C) 2 V(U3:C) 3 V(U3:G) Time All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 15
  16. 16. 9. Winding Characteristic Parameters: Lm Winding Characteristic:2 Lm 1 14A 50V 3 20V U2 SMPL_DC_MOTOR 12A 40V 10V Rm = 0.576 + Lm = 165u - V_norm = 7.2 Motor Spec. 10A 30V 0V mNm = 9.8 kRPM_norm = 14.2 Lm=100u 8A 20V -10V I_norm = 2.9 Lm=165u IL = 0.6 6A 10V -20V Load Condition 4A 0V -30V Lm=100u The Motor Current Waveform is 2A -10V -40V changed by the Lm values. Lm=165u 0A -20V -50V >> -2A -30V -60V 898.0ms 898.4ms 898.8ms 899.2ms 899.6ms 1 I(U3:C) 2 V(U3:C) 3 V(U3:G) Time All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 16
  17. 17. 10. Winding Characteristic Parameters: Rm Winding Characteristic: Rm U2 SMPL_DC_MOTOR Rm = 0.576 + Lm = 165u - V_norm = 7.2 Motor Spec. Rm=0.1 mNm = 9.8 kRPM_norm = 14.2 I_norm = 2.9 IL = 0.6 Load Condition Rm=0.576 The Motor Start-up is Current changed by the Rm values. All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 17
  18. 18. Simulation IndexSimulations Folder name1. Motor Start Up Simulation at Normal Load................... Normal2. Motor Start Up Simulation at Haft of Normal Load........ Half3. Lj of the Motor Model.................................................... Lj All Rights Reserved Copyright (C) Bee Technologies Corporation 2013 18

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