Selecting the proper motor - Haydon Switch & Instrument - A Tritex Corporation Company, linear actuator, rotary motor, ac synchronous motors, stepping motors

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	Size 11 Double Stack Non Captive Linear Actuator
	Size 11 External Double Stack Linear Actuator
	Size 14 with Integrated Connector

SELECTING THE PROPER MOTOR

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In order to select the proper motor several factors must be considered. Is linear or rotary motion required? Following is a list of some of the basic requirements to consider when choosing a motor. This will help determine if a linear actuator or rotary motor should be used.

Linear Actuator

How much force is required?
What is the duty cycle?
What is desired step increment?
What is the step rate or speed of travel?
Bipolar or unipolar coils?
Coil Voltage?
Must the screw hold position with power off or must it be “backdrivable” with power off?
Are there size restrictions?
What is anticipated life requirement?
Temperature of operating environment?
Captive or non-captive shaft?

Rotary Motor

How much torque is required?
What is the duty cycle?
What is desired step angle?
What is the step rate or RPM?
Bipolar or unipolar coils?
Coil Voltage?
Detent or holding torque requirements?
Are there size restrictions?
What is anticipated life requirement?
Temperature of operating environment?
Sleeve or ball bearings?
Radial and axial load?

AC Synchronous Motors

Stepping motors can also be run on AC (Alternating Current). However, one phase must be energized through a properly selected capacitor. In this case the motor is limited to only one synchronous speed. For instance, if 60 hertz is being supplied, there are 120 reversals or alterations of the power source. The phase being energized by a capacitor is also producing the same number of alterations at an offset time sequence. The motor is really being energized at the equivalent of 240 steps per second. For a 15° rotary motor, 24 steps are required to make one revolution (24 SPR). This becomes a 600 RPM synchronous motor.

In the case of a linear actuator the linear speed produced is dependent on the resolution per step of the motor. For example if 60 hertz is supplied to a .001”/step motor the resulting speed is .240” per second (240 steps per second times .001”/step). Many of HSI’s stepping motors are available as 300 or 600 RPM AC synchronous motors.

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