Datasheet TMC2226 (TRINAMIC) - 7
| Hersteller | TRINAMIC |
| Beschreibung | Step/Dir Drivers for Two-Phase Bipolar Stepper Motors up to 2.8A peak – StealthChop for Quiet Movement – UART Interface Option – Sensorless Stall Detection StallGuard4 |
| Seiten / Seite | 83 / 7 — Benefits of using StealthChop2:. 1.5 StallGuard4 – Mechanical Load … |
| Dateiformat / Größe | PDF / 1.9 Mb |
| Dokumentensprache | Englisch |
Benefits of using StealthChop2:. 1.5 StallGuard4 – Mechanical Load Sensing. 1.6 CoolStep – Load Adaptive Current Control
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link to page 7 TMC2226 DATASHEET (Rev. 1.06 / 2020-MAY-18) 7 For highest velocity applications, SpreadCycle is an option to StealthChop2. It can be enabled via input pin or via UART and OTP. StealthChop2 and SpreadCycle may even be used in a combined configuration for the best of both worlds: StealthChop2 for no-noise stand still, silent and smooth performance, SpreadCycle at higher velocity for high dynamics and highest peak velocity at low vibration. SpreadCycle is an advanced cycle-by-cycle chopper mode. It offers smooth operation and good resonance dampening over a wide range of speed and load. The SpreadCycle chopper scheme automatically integrates and tunes fast decay cycles to guarantee smooth zero crossing performance.
Benefits of using StealthChop2:
- Significantly improved microstepping with low cost motors - Motor runs smooth and quiet - Absolutely no standby noise - Reduced mechanical resonance yields improved torque
1.5 StallGuard4 – Mechanical Load Sensing
StallGuard4 provides an accurate measurement of the load on the motor. It can be used for stall detection as well as other uses at loads below those which stall the motor, such as CoolStep load- adaptive current reduction. This gives more information on the drive allowing functions like sensorless homing and diagnostics of the drive mechanics.
1.6 CoolStep – Load Adaptive Current Control
coolStep drives the motor at the optimum current. It uses the stallGuard4 load measurement information to adjust the motor current to the minimum amount required in the actual load situation. This saves energy and keeps the components cool.
Benefits are:
- Energy efficiency power consumption decreased up to 75% - Motor generates less heat improved mechanical precision - Less or no cooling improved reliability - Use of smaller motor less torque reserve required → cheaper motor does the job - Less motor noise Due to less energy exciting motor resonances Figure 1.3 shows the efficiency gain of a 42mm stepper motor when using coolStep compared to standard operation with 50% of torque reserve. coolStep is enabled above 60RPM in the example. 0,9 Efficiency with coolStep 0,8 Efficiency with 50% torque reserve 0,7 0,6 0,5 Efficiency 0,4 0,3 0,2 0,1 0 0 50 100 150 200 250 300 350 Velocity [RPM]
Figure 1.3 Energy efficiency with coolStep (example) 1.7 Automatic Standstill Power Down
An automatic current reduction drastically reduces application power dissipation and cooling requirements. Per default, the stand still current reduction is enabled by pulling PDN_UART input to www.trinamic.com
Benefits of using StealthChop2:
- Significantly improved microstepping with low cost motors - Motor runs smooth and quiet - Absolutely no standby noise - Reduced mechanical resonance yields improved torque
1.5 StallGuard4 – Mechanical Load Sensing
StallGuard4 provides an accurate measurement of the load on the motor. It can be used for stall detection as well as other uses at loads below those which stall the motor, such as CoolStep load- adaptive current reduction. This gives more information on the drive allowing functions like sensorless homing and diagnostics of the drive mechanics.
1.6 CoolStep – Load Adaptive Current Control
coolStep drives the motor at the optimum current. It uses the stallGuard4 load measurement information to adjust the motor current to the minimum amount required in the actual load situation. This saves energy and keeps the components cool.
Benefits are:
- Energy efficiency power consumption decreased up to 75% - Motor generates less heat improved mechanical precision - Less or no cooling improved reliability - Use of smaller motor less torque reserve required → cheaper motor does the job - Less motor noise Due to less energy exciting motor resonances Figure 1.3 shows the efficiency gain of a 42mm stepper motor when using coolStep compared to standard operation with 50% of torque reserve. coolStep is enabled above 60RPM in the example. 0,9 Efficiency with coolStep 0,8 Efficiency with 50% torque reserve 0,7 0,6 0,5 Efficiency 0,4 0,3 0,2 0,1 0 0 50 100 150 200 250 300 350 Velocity [RPM]
Figure 1.3 Energy efficiency with coolStep (example) 1.7 Automatic Standstill Power Down
An automatic current reduction drastically reduces application power dissipation and cooling requirements. Per default, the stand still current reduction is enabled by pulling PDN_UART input to www.trinamic.com