DRV10987: the output voltage of the motor driver

Part Number:DRV10987

hi,

i am using the drv10987 for driving my motor.

and i have 2 questions:

1)

the driver gets 24v input and the voltage to my motor is also 24v.

i see that when the driver goes in to the steady state the voltage that goes to the motor is decreased from 24v to 3.5 v.

i want to limit this voltage decreased to 7v.

how can i limit the minimum value of the voltage the drv gives to the motor?

2) 

my drv is running first at  speed 447.

i am trying to understand the velocity in hz.

so, by the datasheet i see that the velocity is

447/10=47 hz

my motor has 10 poles.

and the RPM IS 47/5*60=564 rpm

am i right? cause this sound very little for rpm.

this is my drv configuration:

{DRV10987Q_CONFIG1_Reg , 0x04 , 0x4A}; 

{DRV10987Q_CONFIG2_Reg , 0x0F , 0x3B};

{DRV10987Q_CONFIG3_Reg , 0xCB , 0x86};

{DRV10987Q_CONFIG4_Reg , 0x23 , 0x8F};

{DRV10987Q_CONFIG5_Reg , 0x3B , 0x0D};

{DRV10987Q_CONFIG6_Reg , 0x79 , 0x63};

{DRV10987Q_CONFIG7_Reg , 0x27 , 0x6A};

thank you,

liraz