Understanding the Panel

When starting the demo, the panel in figure 7 appears first with the default settings.

Figure 7: Start-Up Panel of the Induction 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.
In the middle left corner, under Command, the student can select the type of control to be applied to the induction motor.
Under each command tab, there are control parameters and/or control buttons that are summarized in tables 4 and 5.
Once a control is selected and applied, the student can observe the related waveforms under Oscilloscopes.
More details about the displayed waveforms are discussed later.

Table 4 summarizes the control parameters, while table 5 is dedicated for the control buttons.

Control Parameters	Tab	Interval of Variation
DCM Field Voltage (V)	DC Machine (DCM)	[0; 460]
DCM Variable Load (Ω)	DC Machine (DCM)	[0; 20]
Inverter frequency (Hz)	Command V/F	[0; 60]
Reference torque (Nm)	Torque Control	[-55; 55]
Reference speed (rpm)	Speed Control	[-2500; 2500]

Table 4: Control Parameters of the IM Drive

Control Buttons	Associated functions
TRIGGER		The waveforms are not triggered. They “move”
		The waveforms are triggered with respect to a reference signal.
	This button is accessible only for the V/F Control Oscilloscopes.
V/F control		V/F control is disabled.
		V/F control is enabled.
	This button is accessible in V/F Command only.
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
ACTIVATE		Flux control is disabled.
		Flux control is enabled.
	This button is accessible in Flux Control only.
enable		Torque control is disabled.
		Torque control is enabled.
	This button is accessible in Torque Control only.
ENABLE		Speed control is disabled.
		Speed control is enabled.
	This button is accessible in Speed Control only.
Fia		The DC machine’s armature fuse is blown.
Fia		The DC machine’s armature fuse is intact.
Fif		The DC machine’s field fuse is blown.
Fif		The DC machine’s field fuse is intact.
Fi1		The induction machine’s stator phase 1 fuse is blown.
Fi1		The induction machine’s stator phase 1 is intact.
Fi2		The induction machine’s stator phase 2 fuse is blown.
Fi2		The induction machine’s stator phase 2 is intact.
Fi3		The induction machine’s stator phase 3 fuse is blown.
Fi3		The induction machine’s stator phase 2 is intact.
Control Choice			Allow to implement the flux, torque, and speed controllers manually (User) or automatically (Predefined).

Table 5: Control Buttons and LED Fuse Status Indicators of the IM Drive

Several displays can be seen in figure 7. The content of these displays is summarized in table 6.

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.
IM	Us	RMS line-line voltage at stator terminals.
IM	Is	RMS line current in stator.
IM	Ps	Induction machine active power.
IM	Qs	Induction machine reactive power.
Oscilloscopes V/F Control	Ratio V/F	Ratio between voltage and frequency in [V/Hz].

Table 6: Content of Displays of the IM Drive

On scope localization (for V/F Control and Flux Control), the indices used will be like those of matrix elements.
Hence, the scope located in the upper left corner (first row, first column) is denoted Scope₁₁, while the scope in the upper right corner (first row, second column) is Scope₁₂.
By the same token, the scope in the lower left corner is Scope₂₁ while the scope in the lower right corner is Scope₂₂.
Table 7 summarizes the content of scopes for the “V/F Control and Flux Control” tabs.

Oscilloscopes	Scope	Content of Scopes & Displayed Waveforms
V/F Control	Scope₁₁	Stator currents at phases A, B and C.
	Scope₂₁	DC machine and induction motor speeds.
	Scope₁₂	Line-to-line stator voltages Us_AB, Us_BC, and Us_CA.
	Scope₂₂	DC machine resistive torque.
Flux Control	Scope₁₁	Rotor flux in d-axis and rotor flux in q-axis.
	Scope₂₁	Stator current d-axis and stator current in q-axis.
	Scope₁₂	Triggered rotor fluxes in dq-axes.
	Scope₂₂	Stator voltage in d-axis and stator voltage in q-axis.

Table 7: Content of Scopes and Displayed Waveforms

Regarding the scopes under “Torque Control, Speed Control, and Triggering Scopes” tabs, a column arrangement is considered, as presented in figure 8 below.
Going from top to down, the first scope of the first column is referred to as Scope₁, the second one Scope₂, and the third one Scope₃.; while the two scopes of the second column are referred to as Scope₄ and Scope₅.
Table 8 summarizes the content of scopes for the “Torque Control, Speed Control, and Triggering Scopes” tabs.

Note

The scopes under “Triggering Scopes” are automatically triggered, allowing students to see step change in toque, speed, etc.
Also, zoom-in capability options are enabled for these scopes.

Figure 8: Column Arrangement of Scopes under Torque Control Panel

Oscilloscopes	Scope	Content of Scopes & Displayed Waveforms
Torque Control	Scope₁	Reference and measured torques.
	Scope₂	Induction motor speed.
	Scope₃	Stator current d-axis and stator current in q-axis.
	Scope₄	Rotor flux in d-axis and rotor flux in q-axis.
	Scope₅	Stator voltage in d-axis and stator voltage in q-axis.
Speed Control	Scope₁	Reference and measured torques.
	Scope₂	Reference and measured speeds of the induction motor.
	Scope₃	Stator current d-axis and stator current in q-axis.
	Scope₄	Rotor flux in d-axis and rotor flux in q-axis.
	Scope₅	Stator voltage in d-axis and stator voltage in q-axis.
Triggering Scopes	Scope₁	Reference and measured torques.
	Scope₂	Reference and measured speeds of the induction motor.
	Scope₃	Stator current d-axis and stator current in q-axis.
	Scope₄	Rotor flux in d-axis and rotor flux in q-axis.
	Scope₅	Stator voltage in d-axis and stator voltage in q-axis.

Table 8: Content of Scopes and Displayed Waveforms of the IM Drive

Courseware

Squirrel-cage Induction Motor - Panels

Understanding the Panel