Rotating or static torque sensor
Rotating or static torque sensor
(OP)
Hello,
I am specifying a sensor for measuring torque on an electric motor system, and have come across both static (reaction) sensors and rotational sensors which spin with the shaft.
What would be the relative advantages of choosing one type of sensor over another ?
My application has max torque requirement of 3kNm and speed of 6000rpm.
Thanks
Dave Roseman
I am specifying a sensor for measuring torque on an electric motor system, and have come across both static (reaction) sensors and rotational sensors which spin with the shaft.
What would be the relative advantages of choosing one type of sensor over another ?
My application has max torque requirement of 3kNm and speed of 6000rpm.
Thanks
Dave Roseman





RE: Rotating or static torque sensor
How do you get power to each?
How do you calibrate each?
How many of each sensor are required, and how much real estate do they take up?
RE: Rotating or static torque sensor
A sensor attached to your shaft is battery operated and communicates wirelessly, or it is electrically connected through slip-rings.
A reaction sensor is part of your motor mount, and your motor is attached such that it can rotate against the sensor.
I suggest that you select a couple of likely sensors, and crudely design them into a functioning motor and shaft. Having done this, you can do rough cost estimates. You have a picture you can examine, and you can visualize how the thing(s) will work. The picture may show off some obvious problems that were not obvious to a forum discussion. The pictures may be helpful to your co-workers.
RE: Rotating or static torque sensor
Typically, a reaction sensor would be your first choice for price and accuracy. You would then move to a more expensive rotary system when the application requires.
If you can provide more details on the application, maybe we can provide some guidance.
RE: Rotating or static torque sensor
Dave
RE: Rotating or static torque sensor
Drawback of the RF variety - be careful about interfering the antenna with ferrous material (steel) such as a shaft guard. Follow the manual carefully!
Drawback of the IR variety - heat can screw up your torque signal...calibrate and operate at the same temperature.
Since you have limited space, the rotary transformer suggestion is no good.
Good luck!