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 |
| 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. |
| The DC machine’s armature fuse is intact. | |
F_If |
| The DC machine’s field fuse is blown. |
| The DC machine’s field fuse is intact. | |
F_ia |
| The MUT armature fuse is blown. |
| The MUT armature fuse is intact. | |
F_if |
| The MUT field fuse is blown. |
| 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 Ke | Va | Voltage at MUT armature terminals. |
Parameters Identification Ke | N | MUT speed. |
Parameters Identification Ra | Va | Voltage at MUT armature terminals. |
Parameters Identification Ra | N | MUT speed. |
Parameters Identification Ra | Ia | MUT armature current. |
Parameters Identification Tf & B | N | MUT speed. |
Parameters Identification Tf & B | Tem | Electromagnetic torque of the MUT. |
Parameters Identification Tf & 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 La 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 La | Scope1 | MUT armature current. |
Parameters Identification J | Scope1 | MUT speed. |
Current Control | Scope11 | Reference and measured currents (triggered). |
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