Rotating Field Drives Flashcards
1
Q
What are the results of center tapped power source arrangement for DC machine?
A
- Maximum power output halved
- Direction dependent load distribution
- Two separate supply circuits
2
Q
What are the results of switched tap power source arrangement for DC machine?
A
- V_out ranges for positive to negative V_dc
- Additional degree of freedom
- With filters also suitable
as a single phase
inverter
3
Q
What are the results of single phase inverter arrangement for DC machine?
A
- Complementary drive signals that range from 0 to V_DC
- V_out {-V_DC, +v_DC}
- Degrees of freedom with pulse width modulation da, db (duty cycles)
- V_out = V_A - V_B
- V_cm = (V_a + V_b) / 2 which is average voltage wrt ground
4
Q
What are the properties of DC / AC converters for multiphase systems?
A
- 3 line to line voltages
- V_AB + V_BC + V_CA = 0
- Uniquely described by two degrees of freedom
5
Q
What are the properties of supply for excitation (DC/DC) for Inverters for multiphase systems?
A
- Only required for externally excited machines
- Unidirectional operation
- Half-bridge topology is suitable
6
Q
What are results of three phase inverter?
A
- Complementary drive signals
- Voltage output is [-V_DC/2, V_DC/2]
-2^3 switching states - V_cm = (VA + VB + VC)/3
7
Q
What are results of B6 Bridge?
A
- DOFs at inputs using PWM
- V_x avg = V_DC (d_x-1/2)
- V_{CM} avg = V_DC ((da+db+dc)/3 -1/2)
8
Q
What are setups for bidirectional operation of DC machine?
A
- Center tapped power source
- Switched tap power source
9
Q
What are the kinds of inverters?
A
- Single phase inverter
- Three phase inverter
- B6 bridge
