DRV10983ZPWPR datasheet(33/58 Pages) TI1

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= 0

MIN

= BEMF + I

Rm = BEMF

MIN

BEMF

DRV10983

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SLVSCP6C – JULY 2014 – REVISED MAY 2016

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9.4.7.4 Lock3 (Fault3): No Motor Fault

The phase U current is checked after transitioning from open loop to closed loop. If phase U current is not

greater than 140 mA then the motor is not connected as shown in Figure 32. This condition is treated and

reported as a fault.

Figure 32. No Motor Error

9.4.7.5 Lock4: Open Loop Motor Stuck Lock

Lock4 is used to detect locked motor conditions while the motor start sequence is in open loop.

For a successful startup, motor speed should equal to open to closed loop handoff threshold when the motor is

transitioning into closed loop. However, if the motor is locked, the motor speed is not able to match the open loop

drive rate.

If the motor BEMF is not detected for one electrical cycle after the open loop drive rate exceeds the threshold,

then the open loop was unsuccessful as a result of a locked rotor condition.

9.4.7.6 Lock5: Closed Loop Motor Stuck Lock

If the motor suddenly becomes locked, motor speed and Ktc are not able to be refreshed because motor BEMF

zero cross may not appear after the lock. In this condition, lock can also be detected by the following scheme: if

the current commutation period is 2× longer than the previous period.

9.4.8 AVS Function

When a motor is driven, energy is transferred from the power supply into it. Some of this energy is stored in the

form of inductive energy or as mechanical energy. The DRV10983 includes circuits to prevent this energy from

being returned to the power supply which could result in pumping up the VCC voltage. This function is referred to

as the AVS and acts to protect the DRV10983 as well as other circuits that share the same VCC connection.

Two forms of AVS protection are used to prevent both the mechanical energy or the inductive energy from being

returned to the supply. Each of these modes can be independently disabled through the register configuration

bits AVSMEn and AVSIndEn.

9.4.8.1 Mechanical AVS Function

If the speed command suddenly drops such that the BEMF voltage generated by the motor is greater than the

voltage that is applied to the motor, then the motor’s mechanical energy is returned to the power supply and the

VCC voltage surges. The mechanical AVS function works to prevent this from happening. The DRV10983 buffers

the speed command value and limits the resulting output voltage, UMIN, so that it will not be less than the motor’s

BEMF voltage. The BEMF voltage in the mechanical AVS function is determined using the programmed value for

the motor’s Kt (Kt[6:0]) along with the speed. Figure 33 shows the criteria used by the mechanical AVS function.

Figure 33. Mechanical AVS

The mechanical AVS function can operate in one of two modes, which can be configured by the register bit

AVSMMd:

AVSMMd = 0 – AVS mode is always active to prevent the applied voltage from being less than the BEMF

voltage.

DRV10983ZPWPR 数据表(PDF) 33 Page - Texas Instruments

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