AXOR Motors

NEE Controls Inc offers two types of AXOR servo motor, DC Brushed and DC Brushless.

AXOR DC brushed motors are modest in size and have an excellent price performance ratio. Available motor powers range from 30 to 800watts, operating voltages range from 24 to 90 volts DC and motors have a high overload capacity.

AXOR brushless motors can be encoder commutated providing high torques and very smooth rotor operation. Brushless motors are far lighter than brushed motors of the same power and have low inertia providing high acceleration and deceleration. Available motor powers range from 250 to 3,000 watts. Four operating voltages are available.

Essentially the considerable extra cost of brushless motors and drives is justified in applications where high motor power, low motor weight, small motor size, or high machine acceleration and deceleration is required.

The advantages of AXOR DC brushed motors include:

• Low motor + drive cost - typically less than half the cost of brushless motor + drive of the same torque at modest powers levels



• High inertia - this potentially reduces inertia mismatches on machines



• Smooth motion



• Motor torque constant from 0 to rated speed



• Quiet operation



• Motor torques from 6.4 to 1100 oz.in. at speeds up to 4,600rpm



• Good reliability when used with efficient and correctly configured motor drives

The advantages of AXOR DC brushless motors include

• Very high power to weight ratio, typically twice as good as DC brushed motors, so they can be used in demanding applications



• Low rotor inertia provides very high acceleration and deceleration rates



• High reliability due to efficient transfer of motor heat and absence of brushes and commutator



• Motors torques from 50 to 2500 oz.in. at speeds up to 4000 rpm



• Smooth operation and very high torque at low control voltage input levels when used with AXOR encoder commutated drives



• Can be used in very high duty cycle applications



• Can be used in hazardous environments

Inertia considerations

For optimal machine performance the load inertia seen at the motor shaft should be similar to the motor rotor inertia. In many applications the load inertia seen at the motor far exceeds the motor rotor inertia giving an 'inertia mismatch'. Inertia mismatch can severely limit machine acceleration and impair part quality and part accuracy. The AMC servo algorithm, together with the motor drive characteristics, determines how much of an inertia mismatch is permissible. The AMC4 controller's unique servo algorithm, when used with motor drives operating in torque mode, provides smooth and extremely precise motion, even at high levels of inertia mismatch of up to 8:1.

For more information or to place an order contact our Sales Team.