The Volvo S70 Starter converts the stored battery electricity into the immediate rotational power that brings the five-cylinder engine alive whenever you turn the key, spinning the mechanical crankshaft and operating the car engine. The battery is connected to a heavy cable to which an external Starter solenoid is attached, and as the ignition switch is activated, the solenoid pops a small pinion into the flywheel ring gear and simultaneously activates the Starter motor in its compact housing. In the casing, there is an armature that rotates around the field coils or permanent magnets, and brushes ride on the commutator to ensure the current flows as it rotates. A later Volvo design embraced the gear-reduction design in which an internal reduction gear allowed a smaller and lighter motor to deliver more torque, but early direct-drive designs applied a one-to-one connection. Both designs have an overrunning clutch in common so that the drive pinion disengages when the engine fires to avoid overspeeding the mechanism. Safety circuits are still necessary; the neutral or clutch switch on an automatic or manual cannot engage when the car is in gear, and a relay can be applied to ensure that only the necessary high current is sent to the motor. In the industrial world, there are designs available as alternative Starters that use pneumatic or hydraulic force but have never been installed in the S70 line. Combining established electric Starter technology with careful features, Volvo ensures good cold-weather starts and requires less effort on the part of the driver in the wider Volvo family.
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