Both drive concepts (AC and DC) take reactive power from the mains. Its size is negligible in the case of AC drives, and is RPMdependent below the rated speed with DC drives. The AC drive is the more favourable option here.
Values obtained from empirical feedback:
For AC drives, the value for cos ϕ
1
is in
1-quadrant applications
with diode bridge cos ϕ
1
≈ 0.99
4-quadrant applications
with thyristor bridge and
with energy recovery into the mains cos ϕ
1
≈ 0.9
Values obtained from empirical feedback:
For DC drives, the value for cos ϕ
1
is in
1-quadrant applications cos ϕ
1
≈ 0...0.9
4-quadrant applications cos ϕ
1
≈ 0...0.85
Values obtained from empirical feedback:
For AC drives, the value for cos ϕ
1
is in
1-quadrant applications
with diode bridge cos ϕ
1
≈ 0.99
4-quadrant applications
with thyristor bridge and
with energy recovery into the mains cos ϕ
1
≈ 0.9
Values obtained from empirical feedback:
For DC drives, the value for cos ϕ
1
is in
1-quadrant applications cos ϕ
1
≈ 0...0.9
4-quadrant applications cos ϕ
1
≈ 0...0.85
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