Brushless DC Motors

Performance Considerations

Most toothed motors have large copper areas available and large air gap flux densities to achieve a high torque to power ratio. The constant reluctance motor, in order to achieve the zero cog advantage, must necessarily have a large magnet air gap into which the windings can be set. This drops the available gap flux density and hence the constant reluctance motors tend to be physically a bit larger than their toothed counterparts. Their weight, however, is comparable due to the thin construction techniques of the rotor and stator.

The motors have typically low drag torque (hysteresis of the lamination steel) and low inductance, which keeps the electrical time constant low so that the motor will respond rapidly to move requirements. The motors are highly linear (torque/current) from zero through continuous to peak torque levels. The motors run very quietly and smoothly, particularly at slow speeds high accuracy of positioning is required.

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