{"id":977,"date":"2025-07-06T01:16:59","date_gmt":"2025-07-05T23:16:59","guid":{"rendered":"https:\/\/wp.stromer-tech.info\/?post_type=ht_kb&p=977"},"modified":"2026-05-05T14:22:22","modified_gmt":"2026-05-05T12:22:22","slug":"engine-general","status":"publish","type":"ht_kb","link":"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/motor-allgemeines\/","title":{"rendered":"Motor - General"},"content":{"rendered":"

Drive concepts<\/h3>\n\n\n\n

There are basically three different drive concepts with different advantages and disadvantages: Front-wheel, mid-wheel and rear-wheel motors. An overview of the different drive concepts can be found on the page Special-E.de.<\/a><\/p>\n\n\n\n

If you would also like to take a look at the mid-engines, you can read the article \u201a<\/em>The big e-bike motor comparison - 13 e-MTB motors in the test<\/a><\/em>\u201a<\/em> from September 2023.<\/p>\n\n\n\n

Stromer<\/h3>\n\n\n\n

Stromer uses Brushless DC motors (BLDC). BLDC is a marketing term for\u00a0Three-phase machines<\/a>which draw the AC voltage required for their operation from an electronic circuit that is connected to\u00a0DC voltage<\/a>\u00a0is supplied. In contrast to a simple\u00a0Direct current machine<\/a>\u00a0with carbon brushes is a\u00a0Three-phase synchronous machine<\/a>\u00a0with excitement through\u00a0Permanent magnets<\/a>. The three-phase winding is controlled by a suitable circuit in such a way that it generates a traveling magnetic field which pulls the permanently excited rotor along. The control behavior is largely similar to a DC shunt-wound machine.<\/p>\n\n\n

\n
\"\"
A BLDC motor is a synchronous motor that is driven by a direct current source via an inverter or a switching network supply that generates an electrical alternating current signal for motor control. <\/figcaption><\/figure>\n<\/div>\n\n\n

The circuit below uses six MOSFETs (SW1 to SW6) that act as electronic switches, grouped in pairs for each of the three phases (U, V, W). Control is achieved through Pulse Width Modulation (PWM 1 to PWM 6), which varies the width of the voltage pulses to activate the motor windings in a specific sequence. This electronic commutation generates a rotating magnetic field in the stator, which attracts and repels the permanent magnet rotor, thereby creating rotational motion. <\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

Sensors<\/h3>\n\n\n\n

Hall sensors:<\/strong> As shown in the diagram above, position sensors, so-called Hall sensors, are required to control the BLCD motor. There are three of them with the following tasks:<\/p>\n\n\n\n