开环强拖，D轴电压为负，角度需要朝减小的反向

Signed-off-by: kevin <huhui@sharkgulf.com>

Applications/foc/motor/motor.c

@@ -1528,7 +1528,11 @@ static bool mc_process_force_running(void) {
 			if (motor.force_open_wait > 0) {
 				--motor.force_open_wait;
 			}else {
-				motor.force_open_angle += 1.5f;
+				float positive = 1.0f;
+				if (line_ramp_get_target(&motor.controller.ramp_target_vd) < 0) {
+					positive = -1.0f;
+				}
+				motor.force_open_angle += 1.5f * positive;
 				norm_angle_deg(motor.force_open_angle);
 				mot_contrl_set_angle(&motor.controller, motor.force_open_angle);
 			}