STEVAL-SPMD250V2 STMicroelectronics, STEVAL-SPMD250V2 Datasheet - Page 8

• Manufacturer Part Number: STEVAL-SPMD250V2
• Description: BOARD EVAL SPMD250
• Manufacturer: STMicroelectronics
• Series: EASY POWER™r
• Type: Motor / Motion Controllers & Driversr

Specifications of STEVAL-SPMD250V2

• Main Purpose: Power Management, Motor Control
• Embedded: No
• Utilized Ic / Part: SPMD250
• Primary Attributes: 2-Ph Bipolar Stepper Motors
• Secondary Attributes: Remote Shutdown
• Input Voltage: 12 V to 40 V
• Board Size: 140 mm x 90 mm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 24 V
• Product: Power Management Modules
• Supply Current: 2 A
• Dimensions: 140 mm x 90 mm
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• For Use With/related Products: SPMD250STP
• Other names: 497-10050

Note:
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Stepper motor driver
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Holding current is turned off (bridge completely disabled) whenever the disable button is
clicked.
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After the basic operation of the system has been verified, the acceleration rates, top speed,
and current settings can be adjusted to see how the motor responds.
Running speed: set running speed to about 100 steps/sec
Deceleration rate: set deceleration rate to about 1000 steps/sec
Acceleration current: set acceleration current to about 25%. This is an initial guess as
to the required setting and may need further adjustment. Generally higher acceleration
rate settings require higher acceleration current settings so that the stepper motor does
not start to "slip poles" and fall behind the desired position. Since we have initially set
the acceleration rate setting quite low, 25% is probably adequate.
Running current: set the running current to 25%. In practice the running current can
often be set to a lower value than the acceleration current since the torque requirement
is generally less during the constant speed part of the move. A lower running current
setting can help to keep the device and the motor running cooler.
Deceleration current: set the deceleration current to 25%. Since friction aids in
decelerating the motor it may also be possible to set the deceleration current lower.
Holding current: set the holding current to 25%. Whenever the motor is stopped (after a
run,) this level of current circulates in the motor so that it holds position against any
mechanical disturbance. In the case of a strong static load (perhaps a gravity load of
some sort) it may be necessary to increase this setting. If not much holding torque is
required, then the setting can be reduced so that operating temperatures can be held to
a minimum.
Run: make sure that the motor is free to turn in either direction and click the run button.
The motor should quickly come up to speed ((100 steps/sec)/(1000 steps/sec
sec.). To change the motor direction, click the direction toggle switch. If the motor does
not run click the stop button, increase all four current settings to 50%, and click run
button. If the motor still does not run an oscilloscope and current probe should be used
to observe the motor current.
Stop: click stop to stop the motor
Doc ID 15599 Rev 2
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UM0696