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Kollmorgen
Operation Information
The value of (23) is given on the Y-axis while the percentage of available torque is given on the X-axis.
The value of (23) should not be less than shown on the chart or the torque to the motor is asymmetrical.
Horse Power Contour
The horse power contour circuit exists to protect the system. Brush motors have a limit of how much
power can be transferred from the brushes to the commutator before an arc occurs from brush-to-brush
(known as flashover). Drive and motor damage can occur if flashover happens. The horsepower contour
circuit limits the current to the motor as a function of speed, effectively creating a simulated constant
horsepower curve. The circuit is established as a one- or two-line approximation (P1-P3 and P1-P2-P3,
respectively), as shown in the following diagram. The circuit uses zener diodes, which are inherently
inaccurate and non-linear yet the tolerance of the flashover conditions make this circuit design adequate.
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SERVOSTAR
S/CD Product Family
35
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