Applied-motion STM23R-2ND Bedienungsanleitung PDF herunterladen (Seite 24)

STM23R Hardware Manual

920-0056C

5/5/2015

Heating

Step motors convert electrical power from the driver into mechanical power to move a load. Because step mo-

tors are not perfectly ecient, some of the electrical power turns into heat on its way through the motor. is

heating is not so much dependent on the load being driven but rather the motor speed and power supply volt-

age. ere are certain combinations of speed and voltage at which a motor cannot be continuously operated

without damage.

e drive electronics of the STM23R also disspate power. e heat produced by the electronics is dependent

on power supply voltage and motor speed.

We have characterized the STM23R in our lab and provided curves showing the maximum duty cycle versus

speed for each motor at commonly used power supply voltages. Please refer to these curves when planning

your application. Charts depicting typical power disspation are also provided for use in planning the thermal

design of your application.

Please also keep in mind that a step motor typically reaches maximum temperature aer 30 to 45 minutes of

operation. If you run the motor for one minute then let it sit idle for one minute, that is a 50% duty cycle. Five

minutes on and ve minutes o is also 50% duty. However, one hour on and one hour o has the eect of

100% duty because during the rst hour the motor will reach full (and possibly excessive) temperature.

e actual temperature of the motor depends on how much heat is conducted, convected or radiated out of

it. Our measurements were made in a 40°C (104°F) environment with the motor mounted to an aluminum plate

sized to provide a surface area consistent with the motor power dissipation. Your results may vary.

Maximum Duty Cycle

STM23R-2 Max Duty cycle vs Speed

5 Amps @Ambient of 40°C

Mounted to a 6.4" x 6.4" x .25" Aluminum Plate

2 0

4 0

6 0

8 0

1 0 0

0 1 0 2 0 3 0 4 0 5 0

Speed (RPS)

% Duty Cycle

12 V

24 V

48 V

65 V

1 2 ... 19 20 21 22 23 24

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Applied-motion STM23R-2ND Bedienungsanleitung Seite 24