User Manual

TMC5031-EVAL Manual / Firmware V1.00 (Rev. 1.00 / 2013-FEB-22) 4
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TRINAMICS UNIQUE FEATURES
stallGuard2™ stallGuard2 is a high-precision sensorless load measurement using the back EMF on the
coils. It can be used for stall detection as well as other uses at loads below those
which stall the motor. The stallGuard2 measurement value changes linearly over a wide
range of load, velocity, and current settings. At maximum motor load, the value goes to
zero or near to zero. This is the most energy-efficient point of operation for the motor.
Load
[Nm]
stallGuard2
Initial stallGuard2
(SG) value: 100%
Max. load
stallGuard2 (SG) value: 0
Maximum load reached.
Motor close to stall.
Motor stalls
Figure 1.1 stallGuard2 load measurement SG as a function of load
coolStep™ coolStep is a load-adaptive automatic current scaling based on the load measurement
via stallGuard2 adapting the required current to the load. Energy consumption can be
reduced by as much as 75%. coolStep allows substantial energy savings, especially for
motors which see varying loads or operate at a high duty cycle. Because a stepper
motor application needs to work with a torque reserve of 30% to 50%, even a constant-
load application allows significant energy savings because coolStep automatically
enables torque reserve when required. Reducing power consumption keeps the system
cooler, increases motor life, and allows reducing cost.
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
0 50 100 150 200 250 300 350
Efficiency
Velocity [RPM]
Efficiency with coolStep
Efficiency with 50% torque reserve
Figure 1.2 Energy efficiency example with coolStep
2 Order Codes
Order code
Description
Size of unit [mm
3
]
TMC5031-EVAL
Evaluation board for TMC5031 two phase motor
controller/driver
85 x 55 x 13.5
Table 2.1 Order codes