# What kind of electronics are inside of Thruster motor?

**URL:** <https://discuss.bluerobotics.com/t/what-kind-of-electronics-are-inside-of-thruster-motor/4019>\
**Category:** Thrusters and Motors\
**Created:** [January 4, 2019, 6:59pm UTC](https://discuss.bluerobotics.com/t/what-kind-of-electronics-are-inside-of-thruster-motor/4019 "2019-01-04T18:59:27Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![acjacques](https://avatars.discourse-cdn.com/v4/letter/a/ecccb3/32.png) [@acjacques](https://discuss.bluerobotics.com/u/acjacques)\
**Post date:** [January 4, 2019, 6:59pm UTC](https://discuss.bluerobotics.com/t/what-kind-of-electronics-are-inside-of-thruster-motor/4019/1 "2019-01-04T18:59:27Z")

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There are some beeps when we turn on the motor. What kind of electronics are inside. ? I dont see any reference about. If it stay powered in neutral about 20 minutes the beeps starts in 1 Hz.

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**Author:** ![adam](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/adam/32/9438_2.png) [@adam](https://discuss.bluerobotics.com/u/adam)\
**Post date:** [January 4, 2019, 7:07pm UTC](https://discuss.bluerobotics.com/t/what-kind-of-electronics-are-inside-of-thruster-motor/4019/2 "2019-01-04T19:07:23Z")

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Hi @acjacques,

There are no electronics at all inside the thrusters besides the BLDC motor itself. The beeps are coming from the motor, but they are actually generated by the ESC, its using the motor as a speaker.

-Adam

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**Author:** ![acjacques](https://avatars.discourse-cdn.com/v4/letter/a/ecccb3/32.png) [@acjacques](https://discuss.bluerobotics.com/u/acjacques)\
**Post date:** [January 4, 2019, 7:20pm UTC](https://discuss.bluerobotics.com/t/what-kind-of-electronics-are-inside-of-thruster-motor/4019/3 "2019-01-04T19:20:34Z")

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Ok. Now make sense.

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**Author:** ![JimOates](https://avatars.discourse-cdn.com/v4/letter/j/58f4c7/32.png) [@JimOates](https://discuss.bluerobotics.com/u/JimOates)\
**Post date:** [April 12, 2020, 12:25pm UTC](https://discuss.bluerobotics.com/t/what-kind-of-electronics-are-inside-of-thruster-motor/4019/4 "2020-04-12T12:25:47Z")

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What kind of thruster should I buy

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**Author:** ![leaf](https://avatars.discourse-cdn.com/v4/letter/l/ec9cab/32.png) [@leaf](https://discuss.bluerobotics.com/u/leaf)\
**Post date:** [April 13, 2022, 3:36pm UTC](https://discuss.bluerobotics.com/t/what-kind-of-electronics-are-inside-of-thruster-motor/4019/5 "2022-04-13T15:36:44Z")

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Hi，I am confused about the beeps inside the thruster module.Sometimes it beeps twice when it is powered on then it works well,but when it beeps only once, the motors won’t respond. what is wrong with the motors when it only beeps once?I have detected the voltages, it seems fine,

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**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\
**Post date:** [April 13, 2022, 8:15pm UTC](https://discuss.bluerobotics.com/t/what-kind-of-electronics-are-inside-of-thruster-motor/4019/6 "2022-04-13T20:15:18Z")

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Hi @leaf,

If you’re using our [Basic ESC](https://bluerobotics.com/store/thrusters/speed-controllers/besc30-r3/):

> [@Basic esc does not initialize](https://discuss.bluerobotics.com/t/basic-esc-does-not-initialize/11835/4):
>
> The initial three beeps (rising in pitch) are the ESC detecting each phase of the connected motor. Once the phases are detected, the ESC initialises to arm itself, producing a low sound (when it detects a valid (1100-1900us pulse-duration) signal), followed by a high sound (when it detects a valid “stopped” (1500us pulse-duration) signal). Once all five beeps have occurred, the ESC is armed and ready to be controlled. There’s a visual display of this and the other possible beep sequences in the firmware manual in [Technical Details / Documents](https://bluerobotics.com/store/thrusters/speed-controllers/besc30-r3/#tab-technical-details) on the Basic ESC product page.