THORLABS DRV225 User manual

HA0397T

DRV225 and DRV250

Stepper Motor Actuators

User Guide

Original Instructions

Page 0 ETN043212-D02

DRV225 and DRV250 Stepper Motor Actuators

Contents

Chaper 1 Overview ................................................................................................................................. 1

1.1 Description ........................................................................................................................ 1

Chaper 2 Safety ...................................................................................................................................... 2

2.1 Safety Information ............................................................................................................. 2

2.2 General Warnings ............................................................................................................. 2

Chaper 3 Operation and Maintenance .................................................................................................. 4

3.1 Environmental Conditions ............................................................................................... 4

3.2 Fitting the Motor Actuator ................................................................................................ 4

3.3 Selecting the Stage Type ................................................................................................. 5

3.4 Maintenance ...................................................................................................................... 6

3.5 Pin Assignments ............................................................................................................... 7

3.6 Extension Cables .............................................................................................................. 7

Chaper 4 Specifications ......................................................................................................................... 8

4.1 Specifications .................................................................................................................... 8

4.2 How to Calculate the Linear Displacement ..................................................................... 8

Chaper 5 Regulatory .............................................................................................................................. 9

5.1 Declarations Of Conformity ............................................................................................. 9

5.1.1 For Customers in Europe .........................................................................................................9

5.1.2 For Customers In The USA ......................................................................................................9

Chaper 6 Thorlabs Worldwide Contacts ............................................................................................ 10

Rev B Jan 2020 Page 1

Chapter 1 Overview

1.1 Description

These motor actuators offer 1" (25 mm) and 2” (50 mm) of travel, and when used with one of our stepper motor controllers, such

as the BSC201, can achieve a default maximum speed of 50 mm/s. They

provide sufficient torque for large loads up to 180 N.

The hybrid stepper motor, with its rotor consisting of 50 individual magnetic teeth, is ideally suited for micro-stepping

applications. Aside from the obvious increase in resolution resulting from increasing the steps per revolution from 200 to

409,600, micro-stepping also ensures smoother low-speed motion by allowing the discrete 1.8º step size, which produces

mechanical noise, to be reduced to much smaller steps with inherently lower resultant vibrational noise, achieving a theoretical

minimum step size of 2.4 X 10-6 mm.

The Stepper Motor drive has been equipped with a trapezoidal screw thread for more efficient, high load operation than is

available from a standard threading.

The actuators are compatible with our 2" LNR50M and LNR50DD manual stages. To use the actuator with these stages,

remove the existing manual drive and mount the motor to the side of the stage using two M4 x 40 cap screws (included) - see

Section 3.2.

The knob on the rear shaft of the motor is an inertial damper. When the actuator is powered down, It can also be used to

position the actuator manually.

Note

Manually adjusting the actuator will cause the position to no longer be synchronized to the position display in the control

software - this can lead to overrunning travel limits unexpectedly. If the actuator is powered down and moved by hand, ensure

that it is homed immediately after power up.

Page 2 ETN043212-D02

DRV225 and DRV250 Stepper Motor Actuators

Chapter 2 Safety

2.1 Safety Information

For the continuing safety of the operators of this equipment, and the protection of the equipment itself, the operator should

take note of the Warnings, Cautions and Notes throughout this handbook and, where visible, on the product itself.

The following safety symbols may be used throughout the handbook and on the equipment itself.

2.2 General Warnings

Warning: Risk of Electrical Shock

Given when there is a risk of injury from electrical shock.

Warning

Given when there is a risk of injury to users.

Caution

Given when there is a risk of damage to the product.

Note

Clarification of an instruction or additional information.

Warning

These Motorized Actuators can generate high forces. If handled improperly, they may cause injury. Be aware that failure

of the motor controller may drive the unit into a hard stop and cause damage to the unit.

To avoid injury never put anything in the gap between the Actuator and any rigid structure.

Because it can be software controlled it should be noted that this device could begin to move unexpectedly for a person

within its envelope of operation, who had not programmed the move.

Warning

The actuator may heat up when operated, and this is indicated by the warning hot surface symbol on the product

engraving.

Increased speeds, high duty cycles, and ambient temperature will all affect the temperature of the actuator. Special care

should be taken when handling the product under these conditions, in particular when touching the damping knob and

motor body.

Warning

If this equipment is used in a manner not specified in the handbook, the protection provided by the equipment may be

impaired. In particular, excessive moisture may impair operation.

Spillage of fluid, such as sample solutions, should be avoided. If spillage does occur, clean up immediately using

absorbant tissue. Do not allow spilled fluid to enter the internal mechanism.

The equipment is for indoor use only.

Caution

If the actuator encounters a hard stop while still in the middle of its range (i.e. a translation stage at the end of its travel

range), the motor should be stopped as soon as possible to prevent damage and to keep the unit from overheating

Rev B Jan 2020 Page 3

Chapter 2 Safety

Caution

When storing these units, be sure to fully retract the lead screw to protect the threads from damage. Improper connection

of the motor will result in permanent damage. All power supplied to the motor should be turned off before altering any

connections to the motor. Check all connections before supplying power to the motor.

Caution

The control PC used to operate the driver for the DRV225 and DRV250 actuators must be running Kinesis Software

version 1.14.20 or higher.

Earlier versions of software do not support this product.

Page 4 ETN043212-D02

DRV225 and DRV250 Stepper Motor Actuators

Chapter 3 Operation and Maintenance

3.1 Environmental Conditions

Location Indoor use only

Maximum altitude 2000 m

Temperature range 5 to 40°C (41 to 104°F)

Maximum Humidity Less than 80% RH (non-condensing) at 31°C

To ensure reliable operation the unit should not be exposed to corrosive agents or excessive moisture, heat or dust.

If the unit has been stored at a low temperature or in an environment of high humidity, it must be allowed to reach ambient

conditions before being powered up.

The unit must not be used in an explosive environment.

3.2 Fitting the Motor Actuator

The actuator is designed for fitting to an LNR50 series stage.

Referring to Fig. 3.1...

1) Loosen the mounting block actuator pinch bolts.

2) Remove the existing drive.

3) Loosen the actuator mounting block fixing bolts, and remove the mounting block together with its bolts.

4) Using the screws supplied with the motor, fit the motor actuator to the stage.

5) Adjust the actuator to its center position.

6) Loosen the push block pinch bolts and position the push block such that the stage is in its center of travel.

7) Tighten the push block pinch bolts.

Fig. 3.1 Fitting a motor drive

Caution

This unit is design for operation within normal operating conditions. It is not recommended to use this equipment outside

the following limits.

Caution

When a DRV225 or DRV250 motor actuator is fitted, the stage must be fitted with an LNR50P4(/M) baseplate before it

is fitted to the work surface - see www.thorlabs.com for more information. The legacy LNR50P1 baseplates are not

compatible with these motors.

Rev B Jan 2020 Page 5

Chapter 3 Operation and Maintenance

3.3 Selecting the Stage Type

To ensure that a particular stage is driven properly by the system, a number of parameters must first be set. These parameters relate

to the physical characteristics of the stage being driven (e.g. min and max positions, leadscrew pitch, homing direction etc.).

To assist in setting these parameters correctly, it is possible to associate a specific stage type and axis with the motor controller

channel. Once this association has been made, the server applies automatically, suitable default parameter values on boot up of the

software.

Using Kinesis Software

1) Install the electronic hardware and connect the modules to the relevant axes of the associated stages (see the handbooks

for the associated controller).

2) Ensure that the device is connected to the PC and powered up.

3) Run the Kinesis software - Start/All Programs/Thorlabs/Kinesis/Kinesis.

4) On start-up, the 'Actuator/Startup Settings’ window is displayed This window allows the correct actuator to be selected.

Fig. 3.2 Select Actuator Stage Settings Window - 1

Note

To ensure correct operation, it is important to select the correct stage and axis type as described above. Selecting an

incompatible stage/axis type could result in reduced velocity and/or resolution, and in the worst case could cause the motor

to run into the end stops or home incorrectly.

Page 6 ETN043212-D02

DRV225 and DRV250 Stepper Motor Actuators

5) Click the arrow to the right of the window, and select the actuator type (i.e. DRV225 or DRV250) from the list displayed.

Fig. 3.3 Select Actuator Stage Settings Window - 2

6) Click OK.

7) The server reads in the stage and controller information automatically and loads default parameters set at the factory, i.e.

Max speed 20 mm/sec

Max acceleration 20 mm/sec/sec

Home switch Forward.

Refer to the handbook for the associated controller for more information on driving the actuator.

3.4 Maintenance

After prolonged use, and particularly in applications where small movements are continually repeated, the grease on the drive

shaft may build up. This may cause rough or noisy movement, vibration and excessive heating.

It is good practice to run the motor periodically from one end of travel to the other several times in order to redistribute the

grease.

Note

No customer serviceable parts. Return to manufacturer for service.

Rev B Jan 2020 Page 7

Chapter 3 Operation and Maintenance

3.5 Pin Assignments

Pin assignments for the male D-Type connector on the motor flying lead are described below..

Note a. The limit switch ground wire is connected to the motor body.

Fig. 3.4 Output Connector

3.6 Extension Cables

The motor is supplied with a 0.5 m flying lead and a 3 m (PAA613) extension cable. Additional extension cables are available

separately - see www.thorlabs.com for more details.

Pin Description Pin Description

1Limit Ground a9Ident (for Future Use)

2CCW Limit Switch 10 +5 V

3CW Limit Switch 11 Reserved for Future Use

4Motor Phase B - 12 Reserved for Future Use

5Motor Phase B + 13 + 5 V

6Motor Phase A - 14 Reserved for Future Use

7Motor Phase A + 15 Ground

8Reserved for Future Use

11 15

Page 8 ETN043212-D02

DRV225 and DRV250 Stepper Motor Actuators

Chapter 4 Specifications

4.1 Specifications

a. The unit requires a pre-load in order to function properly and should be used only for pushing loads, do not use for pulling.

b. Although feedback is not provided within the actuator, closed loop control can be achieved by using the LNR50SE stage -

see www.thorlabs.com for further details.

4.2 How to Calculate the Linear Displacement

The DRV series motors have 200 full steps per revolution and when driven by the BSC20x or MST602 drivers there are 2048

microsteps per full step, giving 409,600 microsteps per revolution of the motor lead screw. The lead screw pitch is 1.0 mm

The linear displacement of the lead screw per microstep:

1 / 409600 = 2.4 x 10-6 mm

Specification DRV225 DRV250

Travel Range 25 mm 50 mm

Unidirectional Repeatability ±1.6 µm

Bidirectional Repeatability ±3.9 µm

Maximum Pushing Force a180 N

Max Velocity 50 mm/s

Max Acceleration 50 mm/s2

Limit Switches Hall Effect

Homing Repeatability ±3.6 µm

Feedback None b

Motor Type 2-Phase Stepper Motor

Full Step Angle 1.8°

Lead Screw Pitch 1.0 mm

Microsteps per Revolution 409,600

Motor Phase 2

Rated Voltage 4.6 V

Rated Current per Phase 0.85 A

Resistance per Phase 3.6 Ohms

Inductance / Phase 4.6 mH

Holding Torque 0.2 N•m

Rotor Inertia 24 x 10-7 kg•m2

Insulation Class B

Operating Temperature Range 5 to 40 °C

Humidity Range Less than 80% RH (non-condensing) at 31°C

Actuator Mass 0.58 kg 0.66 kg

Cable Length 0.5 m

Connector Type D-sub DE 15 Pin Male

Compatible Controllers BSC201, BSC202, BSC203, MST602

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