Velocidade do motor passo a passo

Apresente uma curva Torque x Velocidade de um motor de passo (de catalogo) e escreva texto discutindo qualitativamente essa relação Variable Reluctance Versus Permanent

Magnet or Hybrid

Variable Reluctance Motors (VRM) benefit from the

simplicity of their design. These motors do not require

complex permanent magnet rotors, so are generally

more robust than permanent magnet motors.

With all motors, torque falls with increased motor

speed, but the drop in torque with speed is less

pronounced with variable reluctance motors. With

appropriate motor design, speeds in excess of 10,000

steps per second are feasible with variable reluctance

motors, while few permanent magnet and hybrid

motors offer useful torque at 5000 steps per second

and most are confined to speeds below 1000 steps per

second.

The low torque drop-off with speed of variable

reluctance motors allows use of these motors, without

gearboxes, in applications where other motors require

gearing. For example, some newer washing machines

use variable reluctance motors to drive the drum, thus

allowing direct drive for both the slow oscillating wash

cycle and the fast spin cycle.

Variable reluctance motors do have a drawback. With

sinusoidal exciting currents, permanent magnet and

hybrid motors are very quiet. In contrast, variable

reluctance motors are generally noisy, no matter what

drive waveform is used. As a result, permanent magnet

or hybrid motors are generally preferred where noise or

vibration are issues.

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