Torque Control Algorithms

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Inverter Torque Control Algorithms

The inverter generates the motor output according to the V/f algorithm selected. Parameter A044 selects the inverter algorithm for generating the frequency output, as shown in the diagram to the right (A244 for 2nd motor). The factory default is 00 (constant torque).

Variable freq. control, 00 constant torque

Variable freq. control, 01 reduced torque

Variable freq. control, 06 reduced torque1

A044

Output

Review the following description to help you choose the best torque control algorithm for your application.

The built-in V/f curves are oriented toward developing constant torque or variable torque characteristics (see graphs below). You can select either constant torque or reduced torque V/f control.

&RQ¿JXULQJ'ULYH	Parameters	Parameters
	Drive
	Configuring

Constant and Variable (Reduced) Torque – The graph at right shows the constant torque characteristic from 0Hz to the base frequency A003. The voltage remains constant for output frequencies higher than the base frequency. The graph below (left) shows the general variable (reduced) torque curve. The range from 0Hz to the base frequency is the variable characteristic.

VA044 = 01 Variable torque

100%

V	A044 = 00	Constant torque
100%
0			Hz
0	Base		Max.
	Base		Max.
	freq.		freq.
V	A044 = 06	Variable torque
100%

0	Hz	0		Hz

	Max.		Base	Max.
Base		10% Base
freq.	freq.	freq.	freq.	freq.

The graph above (right) shows the variable (reduced) torque curve, which has a constant torque characteristic from 0Hz to 10% of the base frequency. This helps to achieve higher torque at low speed with reduced torque curve at higher speeds.


Manual Torque Boost – The Constant						A042 = 5 (%) V
and	Variable		Torque	algorithms		A042 = 5 (%) V
feature an adjustable torque boost						100%
curve. When the motor load has a lot of
inertia	or	starting friction, you			may	A
need to increase the low frequency						5% voltage
need to increase the low frequency						boost
starting		torque	characteristics		by	(100%=A082)		Hz
boosting the voltage above the normal						0		Hz
boosting the voltage above the normal						0
V/f ratio (shown at right). The function						1.8Hz	30Hz	fbase = 60Hz
attempts		to compensate		for voltage		A043 = 3 (%)
drop in the motor primary winding in						A043 = 3 (%)
drop in the motor primary winding in

the low speed range.

The boost is applied from zero to the base frequency. You set the breakpoint of the boost (point A on the graph) by using parameters A042 and A043. The manual boost is calculated as an addition to the standard V/f curve.

CP-X200 specifications

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Hitachi CP-X200 instruction manual Torque Control Algorithms, Manual Torque Boost The Constant

Models: CP-X200

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