C2000WARE-MOTORCONTROL-SDK: Configuring motor control PWM frequency

Mark Stanczak

Part Number: C2000WARE-MOTORCONTROL-SDK
Other Parts Discussed in Thread: LAUNCHXL-F280049C

In "user.h", I see the following:

//! \brief Defines the Pulse Width Modulation (PWM) frequency, kHz
//!
//#define USER_PWM_FREQ_kHz ((float32_t)(5.0)) //5KHz PWM frequency
//#define USER_PWM_FREQ_kHz ((float32_t)(10.0)) //10KHz PWM frequency
//#define USER_PWM_FREQ_kHz ((float32_t)(12.0)) //12KHz PWM frequency
//#define USER_PWM_FREQ_kHz ((float32_t)(15.0)) //15KHz PWM frequency
#define USER_PWM_FREQ_kHz ((float32_t)(20.0)) //20KHz PWM frequency

Can the PWM frequency be changed to 50.0 kHz or 100 kHz or 200 kHz?

If so, how is that accomplished within the MOTOR CONTROL SDK?

Note: i did try simply changing 20.0 to 50.0, but my example motor did not start spinning.

over 4 years ago

0 Ramesh Ramamoorthy over 4 years ago

TI__Mastermind 27240 points

Which project is this?

0 Mark Stanczak over 4 years ago in reply to Ramesh Ramamoorthy

Intellectual 420 points

I am using the Piccolo 0049C Launchpad (C2000 LAUNCHXL-F280049C) with "TI BOOSTXL-DRV8320 Motor Drive Booster Pack"

//! \file solutions/boostxl_drv8320rs/f28004x/drivers/user.h
//! \brief Contains the user related definitions
//!

0 Yanming Luo over 4 years ago in reply to Mark Stanczak

TI__Guru** 114350 points

You can use a higher PWM frequency, but you need to set the right USER_NUM_PWM_TICKS_PER_ISR_TICK value to keep the ISR frequency (USER_ISR_FREQ_Hz) is lower than 20kHzto make sure that the ISR can be executed without overflow.

+1 Mark Stanczak over 4 years ago in reply to Yanming Luo

Intellectual 420 points

Can you provide specifics on getting 100kHz to work?

Can you also provide specifics on getting 120kHz to work?

0 Yanming Luo over 4 years ago in reply to Mark Stanczak

TI__Guru** 114350 points

As mentioned above, set the USER_PWM_FREQ_kHz and USER_NUM_PWM_TICKS_PER_ISR_TICK in user.h, and to ensure that USER_PWM_FREQ_kHz/USER_NUM_PWM_TICKS_PER_ISR_TICK is less than 20kHz.

So you can set these two parameters:

100kHz

#define USER_NUM_PWM_TICKS_PER_ISR_TICK (5)

#define USER_PWM_FREQ_kHz ((float32_t)(100.0))

120kHz

#define USER_NUM_PWM_TICKS_PER_ISR_TICK (6)

#define USER_PWM_FREQ_kHz ((float32_t)(120.0))

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C2000WARE-MOTORCONTROL-SDK: Configuring motor control PWM frequency