pulsator

noun5

1. •
   A component that beats or throbs while working.

   • Model washing-machines containing a large tank with a realistic pulsator, and a wringer with independently sprung rubber rollers. — 1971
2. •
   (old-fashioned) A beater; a striker.
3. •
   Any pulsating astronomical object
4. •
   A pulsometer.
5. •
   A jigging machine used in the South African diamond industry.