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TMS320F28027F: motor suddenly slowed down

Part Number: TMS320F28027F
Other Parts Discussed in Thread: MOTORWARE

Hello, using
D:\ti\motorware\motorware_1_01_00_18\sw\solutions\instaspin_foc\boards\boostxldrv8305_revA\f28x\f2802xF\projects\ccs\proj_lab10a
The company's hardware discovered that the motor suddenly slowed down when approaching the speed, and then increased again without special protection. 1. Ask if this is caused by the phase current reaching the maximum set value or the phase voltage exceeding 2/3 of the bus voltage,
2. Does phase voltage sampling require a bias voltage?