Determine number of motor poles - Revision history

OlliW at 06:11, 8 October 2020

2020-10-08T06:11:59Z

← Older revision		Revision as of 08:11, 8 October 2020
Line 5:		Line 5:
	Fortunately, it is quite simple to determine this number. Two methods are:		Fortunately, it is quite simple to determine this number. Two methods are:

	* The simplest method is visual inspection: Count the number of the magnets which are glued to the inner side of the rotor bell, and ~~that~~ is the number of motor poles.		* The simplest method is visual inspection: Count the number of the magnets which are glued to the inner side of the rotor bell, and this is the number of motor poles.

	* Sometimes visual inspection is not possible. In this case you have this simple option: Apply a small voltage to two phases of the motor (it does not matter which two out of the three phases you choose). Importantly: USE A SMALL VOLTAGE! It is sufficient to have a low current flowing, so try 1 V or 1.5 V, but not more (for a typical motor phase resistance of 10 Ohms a voltage of 1 V already implies a current of 100 mA). Now grab the rotor bell and turn it around by hand. You will feel that it snaps into certain positions. Count the number of positions it snaps into for a rotation by 360°. That is the number of motor pole pairs. Multiply by two and you get the number of motor poles.		* Sometimes visual inspection is not possible, e.g., for motors with ferrite rings. In this case you have this simple option: Apply a small voltage to two phases of the motor (it does not matter which two out of the three phases you choose). Importantly: USE A SMALL VOLTAGE! It is sufficient to have a low current flowing, so try 1 V or 1.5 V, but not more (for a typical motor phase resistance of 10 Ohms a voltage of 1 V already implies a current of 100 mA). Now grab the rotor bell and turn it around by hand. You will feel that it snaps into certain positions. Count the number of positions it snaps into for a rotation by 360°. That is the number of motor pole pairs. Multiply by two and you get the number of motor poles.

OlliW at 06:11, 8 October 2020

2020-10-08T06:11:09Z

← Older revision		Revision as of 08:11, 8 October 2020
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	Often there is confusion about it, because manufacturer/vendor information is unclear or not even available.		Often there is confusion about it, because manufacturer/vendor information is unclear or not even available.

	Fortunately, it is quite simple to determine this number~~, two~~ methods are:		Fortunately, it is quite simple to determine this number. Two methods are:

	* The simplest method is visual inspection: Count the number of the magnets which are glued to the inner side of the rotor bell, and that is the number of motor poles.		* The simplest method is visual inspection: Count the number of the magnets which are glued to the inner side of the rotor bell, and that is the number of motor poles.

	* Sometimes visual inspection is not possible. In this case you have this simple option: Apply a small voltage to two phases of the motor (it does not matter which two out of the three phases you choose). Importantly: USE A SMALL VOLTAGE! It is sufficient to have a low current flowing, so try 1 V or 1.5 V, but not more (for a typical motor phase resistance of 10 Ohms a voltage of 1 V already implies a current of 100 mA). Now grab the rotor bell and turn it around by hand. You will feel that it snaps into certain positions. Count the number of positions it snaps into for a rotation by 360°. That is the number of motor pole pairs. Multiply by two and you get the number of motor poles.		* Sometimes visual inspection is not possible. In this case you have this simple option: Apply a small voltage to two phases of the motor (it does not matter which two out of the three phases you choose). Importantly: USE A SMALL VOLTAGE! It is sufficient to have a low current flowing, so try 1 V or 1.5 V, but not more (for a typical motor phase resistance of 10 Ohms a voltage of 1 V already implies a current of 100 mA). Now grab the rotor bell and turn it around by hand. You will feel that it snaps into certain positions. Count the number of positions it snaps into for a rotation by 360°. That is the number of motor pole pairs. Multiply by two and you get the number of motor poles.

OlliW at 06:10, 8 October 2020

2020-10-08T06:10:54Z

← Older revision		Revision as of 08:10, 8 October 2020
Line 1:		Line 1:
	The number of motor poles is an important ~~characteristics~~ of a gimbal motor, and needs to be known to setup the STorM32 gimbal controller correctly.		The number of motor poles is an important characteristic of a gimbal motor, and frequently needs to be known to setup the STorM32 gimbal controller correctly.

	Often there is confusion about it, because manufacturer/vendor information is unclear or not even available.		Often there is confusion about it, because manufacturer/vendor information is unclear or not even available.

	Fortunately, it is quite simple to determine this number.		Fortunately, it is quite simple to determine this number, two methods are:

	The simplest ~~one~~ is visual inspection: Count the number of the magnets which are glued to the inner side of the rotor bell, and that's the number.		* The simplest method is visual inspection: Count the number of the magnets which are glued to the inner side of the rotor bell, and that is the number of motor poles.

	Sometimes ~~that's~~ not possible. In ~~that~~ case you have this simple option: Apply a small voltage to two phases of the motor (it ~~doesn't~~ matter which two out of the three you choose). Importantly: USE A SMALL VOLTAGE! It is ~~way~~ sufficient to have ~~only ca 50 mA~~ of current ~~flowing~~. Now ~~take~~ the rotor bell and turn it around. You will feel that it snaps into certain positions. Count the number of positions it snaps into for a rotation by 360°. That's the number of motor pole pairs. Multiply by two and you ~~have~~ the number of motor poles.		* Sometimes visual inspection is not possible. In this case you have this simple option: Apply a small voltage to two phases of the motor (it does not matter which two out of the three phases you choose). Importantly: USE A SMALL VOLTAGE! It is sufficient to have a low current flowing, so try 1 V or 1.5 V, but not more (for a typical motor phase resistance of 10 Ohms a voltage of 1 V already implies a current of 100 mA). Now grab the rotor bell and turn it around by hand. You will feel that it snaps into certain positions. Count the number of positions it snaps into for a rotation by 360°. That is the number of motor pole pairs. Multiply by two and you get the number of motor poles.

OlliW: Created page with "The number of motor poles is an important characteristics of a gimbal motor, and needs to be known to setup the STorM32 gimbal controller correctly. Often there is confusion..."

2020-10-07T18:02:07Z

Created page with "The number of motor poles is an important characteristics of a gimbal motor, and needs to be known to setup the STorM32 gimbal controller correctly. Often there is confusion..."

New page

The number of motor poles is an important characteristics of a gimbal motor, and needs to be known to setup the STorM32 gimbal controller correctly.

Often there is confusion about it, because manufacturer/vendor information is unclear or not even available.

Fortunately, it is quite simple to determine this number.

The simplest one is visual inspection: Count the number of the magnets which are glued to the inner side of the rotor bell, and that's the number.

Sometimes that's not possible. In that case you have this simple option: Apply a small voltage to two phases of the motor (it doesn't matter which two out of the three you choose). Importantly: USE A SMALL VOLTAGE! It is way sufficient to have only ca 50 mA of current flowing. Now take the rotor bell and turn it around. You will feel that it snaps into certain positions. Count the number of positions it snaps into for a rotation by 360°. That's the number of motor pole pairs. Multiply by two and you have the number of motor poles.