Q.I would like to use a torque motor as a brake. Regarding the braking methods, what is the difference between "reverse-phase brake" and "eddy-current brake"?
Both braking methods can be used for applications such as back-tension in winding equipment. The features of each method are as follows.
Reverse-Phase Brake
When an AC voltage is applied to a torque motor, a rotating magnetic field is generated inside the motor, and torque is generated in that direction, causing the motor shaft to rotate. Reverse-phase brake is a method that uses the torque obtained when the motor shaft is rotated in the opposite direction of the rotating magnetic field as the braking force. Reverse-phase brakes have a weaker braking force compared to eddy-current brakes, but they provide braking even at a rotation speed of 0 r/min, the magnitude of which depends on the applied voltage.
- *In addition to torque motors, products that can be used as reverse-phase brakes (back-tension) are introduced here.
Eddy-Current Brake
When a DC voltage is applied to a torque motor, the magnetic field generated inside the motor does not rotate and is stopped. Therefore, the motor does not generate any torque and the motor shaft will stop. However, when external force is applied to the motor shaft and it is rotated in this state, braking force is applied in the opposite direction of the external force. This braking force is called eddy-current brake.
The eddy-current brake has a braking force of 0 mN·m at a rotation speed of 0 r/min, but it increases as the speed of the number of rotations increases,
and the value is almost stable above 1,500 r/min. Also, the braking force varies with the DC voltage.
Product Category: AC Motors
Model and Series: Torque Motors
Description: How to Use/Setting Method, Functions, Characteristics, Specifications, Dimensions
FAQ No.: 71
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