Understanding the Panel

When starting the demo, the panel in figure 9 appears first with the default settings.

Figure 9: Start-Up Panel of the DC Motor Drive Laboratory

The panel is to be operated as follows:

In the upper left corner, under DC Machine (DCM) the student can set the field voltage of the DC machine and can change the value of the resistive load which can be connected or not.
In the middle left corner, under DC Motor Under Test (MUT), the student can set the field voltage of the MUT and can block the rotor.
Under Voltage Source, the student can control the voltage magnitude to be applied.
In the down-left corner, under Estimation & Command, the student can access the parameter identification tab, as well as speed and current controls.
Once an estimation procedure or a control is selected and run, the student can observe the related waveforms and/or displayed values under Oscilloscopes.
More details about the displayed waveforms and values are discussed later.

Table 1 summarizes the control parameters, while table 2 is dedicated to the control buttons.

Control Parameters	Tab	Default Value	Interval of Variation
DCM Field Voltage (V)	DC Machine	0	[0; 460]
DCM Load Resistance (Ω)	DC Machine	20	[5; 45]
MUT Filed Voltage (V)	DC MUT	0	[0; 460]
Reference Current (A)	Current Control	0	[-30; 30]
Reference speed (rpm)	Speed Control	0	[-1800; 1800]

Table 1: Control Parameters of the DCM Drive

Control Buttons	Associated functions
Apply Trigger for Acquisition		Automatic triggering is disabled.
		Automatic triggering is enabled.
	This button is accessible only in Parameters Identification of inertia under Oscilloscopes.
Reset		The reset push button is disabled.
		The reset push button is activated and simulates replacement of fuses after a fault.
	This button is accessible and enabled in all scenarios.
K1		DCM armature is not connected to the single-phase two-level inverter.
		DCM armature is connected to the single-phase two-level inverter.
	This button is accessible in all scenarios.
K2		MUT armature is not connected to the single-phase two-level inverter.
		MUT armature is connected to the single-phase two-level inverter.
	This button is accessible in all scenarios
K3		DCM load resistance is disconnected.
		DCM load resistance is connected.
	This button is accessible in all scenarios.
Speed Control		Speed control is disabled.
		Speed control is enabled.
	This button is accessible in Speed Control only.
Current Control		Current control is disabled.
		Current control is enabled.
	This button is accessible in Current Control only.
Block Rotor		The rotor of the DC motor under test is not blocked.
		The rotor of the DC motor under test is blocked.
	This button is accessible in all scenarios.
F_Ia		The DC machine’s armature fuse is blown.
F_Ia		The DC machine’s armature fuse is intact.
F_If		The DC machine’s field fuse is blown.
F_If		The DC machine’s field fuse is intact.
F_ia		The MUT armature fuse is blown.
F_ia		The MUT armature fuse is intact.
F_if		The MUT field fuse is blown.
F_if		The MUT field fuse is intact.

Table 2: Control Buttons and LED Fuse Status Indicators

Several displays can be seen in figure 9 above. The content of these displays is summarized in table 3.

Tab	Display	Content of Displays
DCM	Va	Voltage at machine armature terminals.
DCM	Ia	DCM armature current.
DCM	Vf	Voltage at field terminals.
DCM	If	Field current.
Shaft	N	Drive rotation speed.
Shaft	Tem	DC machine resistive torque.
MUT	Va	Voltage at MUT armature terminals.
MUT	Ia	MUT armature current.
MUT	Vf	Voltage at field terminals.
MUT	If	Field current.
Parameters Identification K_e	Va	Voltage at MUT armature terminals.
Parameters Identification K_e	N	MUT speed.
Parameters Identification R_a	Va	Voltage at MUT armature terminals.
Parameters Identification R_a	N	MUT speed.
Parameters Identification R_a	Ia	MUT armature current.
Parameters Identification T_f& B	N	MUT speed.
Parameters Identification T_f& B	Tem	Electromagnetic torque of the MUT.
Parameters Identification T_f& B	Ia	MUT armature current.
Parameters Identification J	Ia	MUT armature current.

Table 3: Content of Displays of the DCM Drive

Table 4 presents the content of scopes for different tabs under “Oscilloscopes”.
It should be noted that the “Parameters Identification L_a and J” tabs have only one scope, and their scope is referred to as Scope₁.
For the “Current Control” tab, there are two scopes. The top one is referred as Scope₁₁ and the bottom one as Scope₂₁.

Oscilloscopes	Scope	Content of Scopes & Displayed Waveforms
Parameters Identification L_a	Scope₁	MUT armature current.
Parameters Identification J	Scope₁	MUT speed.
Current Control	Scope₁₁	Reference and measured currents (triggered).
Current Control	Scope₂₁	Reference and measured currents.

Table 4: Content of Scopes and Displayed Waveforms

Regarding the scopes under “Speed Control” tab, the two scopes at the top are referred to as Scope₁ and Scope₂, while the bottom one as Scope₃.
Table 5 summarizes the content of scopes for the “Speed Control” tab.

Oscilloscopes	Scope	Content of Scopes & Displayed Waveforms
Speed Control	Scope₁	Reference and measured currents (triggered).
	Scope₂	Reference and measured speeds (triggered).
	Scope₃	Reference and measured speeds.

Table 5: Content of Scopes and Displayed Waveforms of the DCM Drive

Note

The scopes that are automatically triggered allow students to see step change in current and speed.
Also, zoom-in capability options are enabled for these scopes.

Armature windings Resistance	1.5 Ω
Armature Inductance	0.04 H
Field windings Resistance	414.41 Ω
Field Inductance	2.44 H
Back-emf Constant	2.7088 V.s/rad
Base Speed	1800 rpm

Table 6: Parameters of the DC Motor Under Test

Nominal Power	16 HP
Armature Nominal Voltage	460 V
Field Nominal Voltage	460 V
Field Nominal Current	1.11 A
Nominal Speed	1746 rpm

Table 7: DCM and MUT Nameplate Ratings

DC Input
Voltage DC	460 V
Maximum Current	31.5 A
AC Output	1-phase
Maximum Voltage	460 V
Maximum Current	31.5 A
Power	14.5 kW

Table 8: Single-phase Two-level Inverter Nameplate Ratings

Total Inertia	0.31 kg.m²
Total Friction	0.0135 N.m

Table 9: Test Bench Mechanical Parameters

Courseware

DCM - Panels

Understanding the Panel